Polyester resin filtering device with circulating filtering function

Abstract

The invention discloses a polyester resin filtering device with a circulating filtering function, and relates to the technical field of polyester resin processing, the polyester resin filtering device comprises a filtering device main body and a controller, the filtering device main body comprises a tank body, the tank body is provided with a stirring bin and a treatment bin, and the tank body is provided with a driving assembly; a filtering assembly is arranged in the stirring bin, two stirring assemblies are arranged on the driving assembly, a heating device is arranged in the inner wall of the tank body, a backflow assembly is installed outside the tank body, the input end of the backflow assembly is connected with the treatment bin, and the output end of the backflow assembly is connected with the stirring bin; a feeding hole is formed in the upper part of the tank body, and a filling component is mounted on the feeding hole; when the device is used, the polyester resin can be processed by adopting a multi-filtering function, and bubbles in the polyester resin can be eliminated in the processing process, so that the polyester resin can be conveniently put into subsequent procedures.

Description

Technical Field

[0001] This invention relates to the field of polyester resin processing technology, specifically a polyester resin filtration device with a circulating filtration function. Background Technology

[0002] Polyester resins are widely used in coatings, fibers, packaging, and other fields. Impurities generated during their production (such as unreacted monomers and catalyst residues) can significantly reduce the mechanical properties and weather resistance of the materials. High-efficiency circulating filtration devices remove impurities and recover unreacted raw materials, thereby improving resource utilization and reducing waste.

[0003] Polyester resin is an important polymer material with wide applications in industrial production. However, untreated polyester resin often contains various impurities and particles, which affect its performance and quality, and consequently the quality of its finished products. Traditional filtration devices have limitations in filtration effect and efficiency, making it difficult to meet the demands of high-quality polyester resin production. Furthermore, existing polyester resin processing equipment generates a large number of bubbles during processing, which can easily affect the subsequent use of the polyester resin. Summary of the Invention

[0004] The purpose of this invention is to provide a polyester resin filtration device with a circulating filtration function to solve the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a polyester resin filter device with a circulating filtration function, comprising a filter device body and a controller. The filter device body includes a tank, the tank being provided with a stirring chamber and a processing chamber. A drive assembly is provided on the tank, the stirring chamber is provided with a filter assembly, the drive assembly is provided with two sets of stirring assemblies, a heating device is provided inside the inner wall of the tank, and a reflux assembly is installed outside the tank. The input end of the reflux assembly is connected to the processing chamber, and the output end of the reflux assembly is connected to the stirring chamber. A feed inlet is provided on the top of the tank, and a packing assembly is installed on the feed inlet; The tank has a discharge port at the bottom.

[0006] Furthermore, the stirring assembly can eliminate air bubbles in the polyester resin, with one set of the stirring assemblies rotating forward and the other set rotating in reverse.

[0007] Furthermore, the drive assembly includes a drive device and a drive sleeve. The drive sleeve is installed inside the tank, the drive rod device is installed outside the tank, and multiple sets of support rods are installed outside the drive sleeve. The other end of each support rod is connected to the inner wall of the tank. A limit groove is provided inside the drive sleeve, and multiple sets of drive wheels are provided inside the limit groove. One end of each drive wheel is installed inside a sliding groove via a bearing. A stirring assembly is installed at each end of the drive sleeve.

[0008] Furthermore, the stirring assembly includes a stirring rod, one end of which is fitted with a mating wheel that meshes with a drive wheel, and the two sets of stirring rods are respectively connected to the drive sleeve via bearings; The stirring rod located at the upper end of the drive sleeve has its other end connected to the drive device.

[0009] Furthermore, each of the two sets of stirring rods is equipped with a U-shaped support rod, and multiple sets of defoaming rods are installed between the U-shaped support rods, with multiple sets of spikes on the defoaming rods.

[0010] Furthermore, the filter assembly includes multiple sets of filter screens, which are equidistantly installed in the mixing chamber. The filter screens are installed at an angle in the mixing chamber, with one end of the filter screen near the feed inlet higher than the other end. The pore size of the filter screen gradually decreases from top to bottom.

[0011] Furthermore, the reflux assembly includes multiple sets of reflux pumps, which are equidistantly installed outside the tank. The input end of the reflux pump is connected to the processing chamber, the output end of the reflux pump is connected to the mixing chamber, and the output end of the reflux pump is located above the filter assembly.

[0012] Furthermore, the packing assembly includes a packing tube, inside which a flow detector is installed, and the flow detector is connected to the controller.

[0013] Furthermore, a pressure sensor is installed inside the tank, and the pressure sensor is connected to the controller.

[0014] Furthermore, the controller is installed outside the enclosure, and a control panel is mounted on the controller.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up multiple sets of inclined filter screens with gradually decreasing pore size from top to bottom, and combining this with a reflux pump to pump the resin in the treatment chamber back to the mixing chamber for circulating filtration, multi-stage, circulating filtration of polyester resin is achieved. This structure can effectively intercept impurities of different particle sizes, avoiding the problems of easy clogging and incomplete filtration of a single filter screen, and significantly improving the purity of polyester resin and the quality of the finished product; 2. By setting up two sets of forward and reverse reversible stirring components and installing spiked defoaming rods on the stirring rods, a complex flow field is formed during the stirring process, which promotes the bursting, merging, and floating of bubbles. This structure can effectively eliminate bubbles in polyester resin, prevent defects such as pores and uneven surfaces in the finished product, and improve the yield and material properties of subsequent processing. 3. The device integrates a flow detector, pressure sensor, heating device, and controller to achieve real-time monitoring and automatic adjustment of parameters such as feed flow rate, tank pressure, and temperature. Combined with a reflux assembly, it achieves circulating filtration, which not only improves filtration efficiency and raw material utilization but also avoids equipment safety hazards caused by abnormal temperature or pressure, thereby enhancing the overall automation and stability of production. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the internal structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the structure of the stirring assembly of the present invention; Figure 6 This is a cross-sectional view of the packing tube of the present invention; Figure 7 This is a schematic diagram of the structure of the filter screen of the present invention; In the diagram: 1. Main body of the filter device; 11. Tank; 2. Drive assembly; 21. Drive sleeve; 22. Drive wheel; 3. Filter assembly; 31. Filter screen; 4. Stirring assembly; 41. Stirring rod; 42. Matching wheel; 43. U-shaped support rod; 44. Defoaming rod; 5. Reflux assembly; 51. Reflux pump; 6. Packing assembly; 61. Packing tube; 62. Flow detector. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example: Figures 1-7As shown, the present invention provides a technical solution for a polyester resin filtration device with a circulating filtration function, including a filter device body 1 and a controller. The filter device body 1 includes a tank 11, a mixing chamber and a processing chamber, a drive assembly 2 on the tank 11, a filter assembly 3 inside the mixing chamber, two sets of mixing assemblies 4 on the drive assembly 2, a heating device inside the inner wall of the tank 11, and a reflux assembly 5 installed outside the tank 11. The input end of the reflux assembly 5 is connected to the processing chamber, and the output end of the reflux assembly 5 is connected to the mixing chamber. A feed inlet is provided on the top of the tank body 11, and a packing assembly 6 is installed on the feed inlet; A discharge port is provided at the bottom of tank 11; When using this device, polyester resin is first fed into the inlet. The feeding process is controlled and regulated by the packing assembly 6. After entering the mixing chamber, the filter assembly 3 filters the polyester resin, intercepting larger impurities and particles. Then, the drive assembly 2 starts, driving the two sets of mixing assemblies 4 to start working and thoroughly mixing the polyester resin. During the mixing process, the heating device inside the tank 11 starts to function, adjusting the temperature inside the tank 11 to a suitable range to ensure that the polyester resin has good flowability and filtration performance. The polyester resin that has undergone preliminary filtration and mixing flows into the treatment chamber for further processing and sedimentation. At this time, the reflux assembly 5 starts to work, extracting the pre-treated polyester resin from the treatment chamber through the input end and sending it back to the mixing chamber through the output end for circulation filtration. This circulation filtration process can be repeated multiple times to ensure that impurities in the polyester resin are fully filtered out, improving the filtration effect and quality. After multiple circulation filtrations, the polyester resin that meets the quality requirements is finally discharged from the outlet at the bottom of the tank 11, completing the entire filtration process. This achieves efficient circulation filtration of polyester resin, improving production efficiency and product quality.

[0019] like Figures 2-4 As shown, in this embodiment, specifically, the stirring assembly 4 can eliminate bubbles in the polyester resin, with one set of stirring assemblies 4 rotating forward and the other set of stirring assemblies 4 rotating in reverse. When the stirring components 4 of this device stir the polyester resin, one set of stirring components 4 rotates clockwise while the other set rotates counterclockwise, creating opposing stirring force fields. These opposing force fields cause the polyester resin to form a complex flow state within the stirring chamber, with fluids from different directions colliding and compressing each other. During this process, air bubbles inside the polyester resin are subjected to forces from different directions, making it difficult for them to remain stable. The alternating clockwise and counterclockwise stirring components 4 continuously break the surface tension of the air bubbles, causing them to gradually break down. Moreover, this stirring method also promotes the fusion of small air bubbles that were originally clustered together in the polyester resin, forming larger air bubbles. These larger air bubbles are more likely to rise to the surface of the polyester resin under the action of buoyancy, thus detaching from the polyester resin system. In addition, the stirring components 4 also generate a certain shear force during the stirring process. This shear force further acts on the air bubbles, accelerating their breakage and elimination. In this way, the stirring components 4 can effectively eliminate air bubbles in the polyester resin, avoiding the adverse effects of air bubbles on subsequent processing and product quality, such as preventing problems like pores and uneven surfaces in the product. This further improves the quality of the polyester resin and the effect of subsequent processing, providing a strong guarantee for the production of high-quality polyester resin products.

[0020] like Figures 2-4 As shown in this embodiment, specifically, the drive assembly 2 includes a drive device and a drive sleeve 21. The drive sleeve 21 is installed inside the tank 11, the drive rod device is installed outside the tank 11, and multiple sets of support rods are installed outside the drive sleeve 21. The other end of the support rods is connected to the inner wall of the tank 1. A limit groove is provided inside the drive sleeve 21, and a sliding groove is provided inside the limit groove. Multiple sets of drive wheels 22 are provided inside the limit groove and the sliding groove. One end of the drive wheel 22 is installed inside the sliding groove through a bearing. A stirring assembly 4 is installed at both ends of the drive sleeve 21. When the drive assembly 2 of the device is in use, the drive unit starts to operate, and its power is transmitted to the drive sleeve 21 through a set of stirring components 4. The drive unit installed outside the tank 11 can stably provide power support for the entire drive assembly 2. Multiple sets of support rods outside the drive sleeve 21 play a stabilizing and supporting role, ensuring the stability of the drive sleeve 21 during operation. When the drive sleeve 21 rotates, multiple sets of drive wheels 22 located in the limiting groove and the sliding groove will also rotate accordingly. Since one end of the drive wheel 22 is installed inside the sliding groove through a bearing, as the drive wheel 22 rotates, the stirring components 4 installed at both ends of the drive sleeve 21 also start to work. Because of the stable operation of the drive wheel 22, the stirring components 4 can rotate forward and reverse in a predetermined manner. The drive assembly 2 provides a stable and efficient power source for the stirring components 4, ensuring that the stirring components 4 can continuously and stably stir the polyester resin. During the stirring process, the drive assembly 2 can adjust the stirring speed and force according to actual needs to adapt to the characteristics and filtration requirements of different polyester resins.

[0021] like Figures 2-4 As shown, in this embodiment, specifically, the stirring assembly 4 includes a stirring rod 41, one end of which is equipped with a mating wheel 42, which meshes with the drive wheel 22, and the two sets of stirring rods 41 are respectively connected to the drive sleeve 21 through bearings; The stirring rod 41 is located at the upper end of the drive sleeve 21, and its other end is connected to the drive device; Driven by the drive assembly 2, the stirring assembly 4, with the meshing of the mating wheel 42 and the drive wheel 22, allows power to be transmitted from the drive wheel 22 to the stirring rod 41. Since the two sets of stirring rods 41 are connected to the drive sleeve 21 through bearings, and the stirring rod 41 located at the upper end of the drive sleeve 21 is directly connected to the drive device, it further ensures that the power of the drive device can be stably transmitted to the stirring assembly 4. When the drive wheel 22 rotates, the mating wheel 42 that meshes with it will drive the stirring rod 41 to rotate. Because one set of stirring rods 41 rotates forward and the other set rotates in reverse, the stirring effects produced by different stirring rods 41 cooperate with each other during the stirring of polyester resin. The forward-rotating stirring rod 41 will cause the polyester resin to flow in one direction, while the reverse-rotating stirring rod 41 will cause the polyester resin to flow in the opposite direction, thus forming a complex fluid motion. As the stirring continues, the fluidity of the polyester resin will continuously improve, and impurities and particles inside it will be more easily intercepted and removed under the combined action of stirring and filtration.

[0022] like Figure 5 As shown in this embodiment, specifically, U-shaped support rods 43 are installed on the two sets of stirring rods 41 respectively, and multiple sets of defoaming rods 44 are installed between the U-shaped support rods 43. Multiple sets of spikes are provided on the defoaming rods 44. The U-shaped support rod 43 on the stirring rod 41 plays an important supporting and connecting role during the stirring process. Multiple sets of defoaming rods 44 are installed between the U-shaped support rods 43, allowing them to move in the polyester resin as the stirring rod 41 rotates. The multiple sets of spikes on the defoaming rods 44 play a key defoaming role. When the stirring rod 41 rotates, the defoaming rods 44 will continuously shuttle in the polyester resin, and the spikes will fully contact the bubbles in the polyester resin. These spikes can easily pierce the surface of the bubbles, causing them to burst. Moreover, as the stirring continues, the polyester resin will continuously wash the defoaming rods 44 and spikes, further promoting the bursting and elimination of bubbles.

[0023] like Figure 3 and Figure 7 As shown, in this embodiment, specifically, the filter assembly 3 includes multiple sets of filter screens 31, which are equidistantly installed in the mixing chamber. The filter screens 31 are installed at an angle in the mixing chamber, with one end of the filter screen 31 closer to the feed inlet being higher than the other end. The pore size of the filter screen 31 gradually decreases from top to bottom. When the filter assembly 3 of this device is in use, after the polyester resin is fed into the inlet, it first falls onto the uppermost filter screen 31. Since the filter screen 31 is installed at an angle, with the end closer to the inlet higher than the other end, the polyester resin will naturally slide down the inclined surface. During the descent, larger impurities and particles will be intercepted by the uppermost filter screen 31 with larger pores. As the polyester resin continues to flow downward, it will pass through the lower filter screens 31 with gradually decreasing pore sizes. Each time it passes through a layer of filter screen 31, impurities of different sizes will be intercepted. This staged and layered filtration method can effectively improve the accuracy and efficiency of filtration. Moreover, the equidistant installation method ensures that the polyester resin has a relatively uniform flow path and residence time between each layer of filter screen 31, ensuring comprehensive filtration. After the polyester resin has passed through multiple layers of filter screen 31, most of the larger impurities and particles have been successfully intercepted. Only after the initial filtration will the polyester resin enter the subsequent stirring and processing stage, providing a solid foundation for subsequent circulating filtration and product quality.

[0024] like Figures 1-3 As shown, in this embodiment, specifically, the reflux assembly 5 includes multiple sets of reflux pumps 51. The reflux pumps 51 are equidistantly installed outside the tank 11. The input end of the reflux pump 51 is connected to the processing chamber, the output end of the reflux pump 51 is connected to the stirring chamber, and the output end of the reflux pump 51 is located above the filter assembly 3. When the device’s reflux assembly 5 is in use, multiple sets of reflux pumps 51, which are equidistantly installed outside the tank 11, start to work. They extract the pre-treated polyester resin from the processing chamber through the input end. Since the output end of the reflux pump 51 is located above the filter assembly 3, the extracted polyester resin will return to the mixing chamber and fall onto the top filter screen 31 of the filter assembly 3. When it passes through the filter assembly 3 again, the polyester resin will repeat the previous filtration process to further intercept any remaining impurities and particles. This circulating filtration method allows the polyester resin to continuously circulate between the mixing chamber and the processing chamber. Each circulation further improves the filtration effect. As the number of circulations increases, the impurities in the polyester resin decrease, and its purity and quality continuously improve. After multiple circulation filtrations, the impurities in the polyester resin are fully removed, and the polyester resin that meets the quality requirements is finally discharged from the outlet at the bottom of tank 11, completing the entire efficient circulating filtration process and providing a reliable guarantee for the subsequent production of high-quality polyester resin products.

[0025] like Figure 3 and Figure 6 As shown, in this embodiment, specifically, the packing assembly 6 includes a packing tube 61, and a flow detector 62 is installed inside the packing tube 61. The flow detector 62 is connected to the controller. When the packing assembly 6 of the device is in use, polyester resin enters the packing tube 61 from the inlet. The flow detector 62 installed inside the packing tube 61 will detect the flow rate of the polyester resin in real time and transmit the detected flow data to the controller. The controller can accurately analyze and judge the flow rate according to the preset parameters and actual production needs. If the flow rate is too high, the controller can issue a command to adjust the opening of the packing tube 61 or reduce the feed rate to avoid the accumulation of polyester resin in the mixing chamber, which would affect the filtration and mixing effect. If the flow rate is too low, the controller can increase the feed rate accordingly to ensure the production efficiency of the entire filtration unit.

[0026] like Figures 1-3 As shown in this embodiment, specifically, a pressure sensor is installed inside the tank 11, and the pressure sensor is connected to the controller. Because the device operates in a sealed state during the processing of polyester resin, and the heating device heats the polyester resin inside tank 11, the air pressure inside tank 11 changes. The function of the air pressure sensor is to monitor the air pressure inside tank 11 in real time and transmit the air pressure data to the controller. When the air pressure inside tank 11 is too high, it may cause pressure on tank 11 and even pose a safety hazard. At this time, the controller will issue corresponding instructions to take appropriate measures to reduce the air pressure, adjust the power of the heating device, reduce heat input, thereby lowering the temperature of the polyester resin and causing the air pressure to drop. Alternatively, some gas can be discharged through the exhaust channel of tank 11 to balance the gas pressure inside tank 11. When the gas pressure inside tank 11 is too low, it may affect the flowability and filtration effect of polyester resin. The controller will then control the heating device to appropriately increase the temperature and increase the gas pressure inside tank 11, or supplement the gas in other ways to restore the gas pressure to a suitable range.

[0027] like Figure 1 As shown in this embodiment, specifically, the controller is installed outside the housing, and a control panel is installed on the controller; Through the control panel on the controller, the operator can easily operate and monitor the entire filtration device. The operator can set various parameters on the control panel, such as the temperature range of the heating device, the working frequency of the reflux pump 51, and the stirring speed of the stirring component 4, to meet the filtration requirements of different polyester resins. At the same time, the control panel can also display the operating status of the filtration device in real time, including data such as the temperature, air pressure, and flow rate of polyester resin in the tank 11, so that the operator can understand the working status of the device in a timely manner.

[0028] Working Principle: When using this device, polyester resin is first fed into the inlet. The feeding process is controlled and regulated by the packing assembly 6. After entering the mixing chamber, the filter assembly 3 first filters the polyester resin, intercepting larger impurities and particles. Then, the drive assembly 2 starts, driving the two sets of mixing assemblies 4 to start working, thoroughly mixing the polyester resin. During the mixing process, the heating device inside the tank 11 begins to function, adjusting the temperature inside the tank 11 to a suitable range to ensure that the polyester resin has good flowability and filtration performance. After preliminary filtration and mixing, the polyester resin... The resin flows into the treatment chamber for further processing and sedimentation. At this time, the reflux component 5 starts working, extracting the pre-treated polyester resin from the treatment chamber through the input end and sending it back to the mixing chamber through the output end for circulation filtration. This circulation filtration process can be repeated multiple times to ensure that impurities in the polyester resin are fully filtered out, improving the filtration effect and quality. After multiple circulation filtrations, the polyester resin that meets the quality requirements is finally discharged from the outlet at the bottom of the tank 11, completing the entire filtration process. This achieves efficient circulation filtration of polyester resin, improving production efficiency and product quality.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A polyester resin filter device with a circulating filtration function, comprising a filter device body (1) and a controller, characterized in that: The main body (1) of the filter device includes a tank (11), the tank (11) is provided with a stirring chamber and a processing chamber, a drive assembly (2) is provided on the tank (11), a filter assembly (3) is provided in the stirring chamber, two sets of stirring assemblies (4) are provided on the drive assembly (2), a heating device is provided in the inner wall of the tank (11), and a reflux assembly (5) is installed on the outside of the tank (11). The input end of the reflux assembly (5) is connected to the processing chamber, and the output end of the reflux assembly (5) is connected to the stirring chamber. A feed inlet is provided above the tank body (11), and a packing assembly (6) is installed on the feed inlet. The tank (11) has a discharge port at the bottom.

2. The polyester resin filter device with circulating filtration function according to claim 1, characterized in that: The stirring assembly (4) can eliminate bubbles in the polyester resin. One set of the stirring assembly (4) rotates forward and the other set of the stirring assembly (4) rotates in reverse.

3. A polyester resin filter device with circulating filtration function according to claim 2, characterized in that: The drive assembly (2) includes a drive device and a drive sleeve (21). The drive sleeve (21) is installed inside the tank (11). The drive rod device is installed outside the tank (11). Multiple sets of support rods are installed outside the drive sleeve (21). The other end of the support rod is connected to the inner wall of the tank (1). A limiting groove is provided inside the drive sleeve (21). A sliding groove is provided inside the limiting groove. Multiple sets of drive wheels (22) are provided inside the limiting groove and the sliding groove. One end of the drive wheel (22) is installed inside the sliding groove through a bearing. A stirring assembly (4) is installed at both ends of the drive sleeve (21).

4. A polyester resin filter device with circulating filtration function according to claim 3, characterized in that: The stirring assembly (4) includes a stirring rod (41), one end of which is fitted with a mating wheel (42), which meshes with a drive wheel (22). The two sets of stirring rods (41) are connected to the drive sleeve (21) respectively through bearings. The stirring rod (41) located at the upper end of the drive sleeve (21) has its other end connected to the drive device.

5. A polyester resin filter device with circulating filtration function according to claim 4, characterized in that: Each of the two sets of stirring rods (41) is equipped with a U-shaped support rod (43), and multiple sets of defoaming rods (44) are installed between the U-shaped support rods (43). Multiple sets of spikes are provided on the defoaming rods (44).

6. A polyester resin filter device with circulating filtration function according to claim 5, characterized in that: The filter assembly (3) includes multiple sets of filter screens (31), which are installed at equal intervals in the mixing chamber. The filter screens (31) are installed at an angle in the mixing chamber. The end of the filter screen (31) near the feed inlet is higher than the other end. The aperture of the filter screen (31) gradually decreases from top to bottom.

7. A polyester resin filter device with circulating filtration function according to claim 6, characterized in that: The reflux assembly (5) includes multiple sets of reflux pumps (51). The reflux pumps (51) are installed at equal intervals outside the tank (11). The input end of the reflux pump (51) is connected to the processing chamber, and the output end of the reflux pump (51) is connected to the stirring chamber. The output end of the reflux pump (51) is located above the filter assembly (3).

8. A polyester resin filter device with circulating filtration function according to claim 7, characterized in that: The packing assembly (6) includes a packing tube (61), inside which a flow detector (62) is installed, and the flow detector (62) is connected to a controller.

9. A polyester resin filter device with circulating filtration function according to claim 8, characterized in that: A pressure sensor is installed inside the tank (11), and the pressure sensor is connected to the controller.

10. A polyester resin filter device with circulating filtration function according to claim 9, characterized in that: The controller is installed outside the enclosure, and a control panel is mounted on the controller.

Images