High-temperature-resistant PET filament spunlace honeycomb structure filter cartridge and modification method thereof

Abstract

This invention discloses a high-temperature resistant PET filament hydroentangled honeycomb structure filter cartridge and its modification method, belonging to the field of filter cartridge technology. It includes an upper pressure ring, with a mounting sleeve vertically fixed to the bottom end of the upper pressure ring, and a fixing ring horizontally fixed to the bottom end of the mounting sleeve. This invention, by setting a pressure relief mechanism in the middle of the lower baffle, can precisely address the pressure runaway problem when the filter cartridge is clogged. When the filter material is clogged by high-humidity, sticky dust, causing the pulse cleaning airflow to fail to diffuse evenly along the honeycomb pores, and the internal air pressure of the filter cartridge suddenly increases, the pressure relief mechanism can automatically respond. Excessive air pressure pushes the sealing cover to open and release pressure, effectively dissipating localized concentrated forces and preventing them from exceeding the tolerance limit of the PET filaments. This prevents breakage of the honeycomb pore fiber connection points, PTFE membrane peeling, and localized damage to the filter material, ensuring the integrity of the core filtration structure of the filter cartridge, thereby maintaining a long-term stable filtration state and significantly reducing the risk of dust leakage.

Description

Technical Field

[0001] This invention relates to a honeycomb structure filter cartridge, and more particularly to a high-temperature resistant PET filament spunlace honeycomb structure filter cartridge. This invention also relates to a modification method, and more particularly to a modification method for a high-temperature resistant PET filament spunlace honeycomb structure filter cartridge, belonging to the field of filter cartridge technology. Background Technology

[0002] To meet the needs of high-temperature dust purification in industry, high-temperature resistant PET filament hydroentangled honeycomb structure filter cartridges are widely used. They are made of high-temperature resistant PET filaments as the base material and are made into hexagonal honeycomb pores with a side length of 0.5-2mm through a 5-50MPa hydroentanglement process, which increases the filtration area by 30%-50%. They can withstand long-term temperatures of 120-150℃ and have a filtration efficiency of ≥99.9%. Some parts are coated with 1-3μm PTFE film to enhance the interception. They can be used in steel metallurgy, waste incineration and other working conditions of 80-220℃.

[0003] Currently, the airflow pressure of pulse cleaning systems is typically controlled between 0.4 and 0.8 MPa to match the conventional tolerance limits of PET filaments. However, when filter cartridges become severely clogged due to high humidity, sticky dust, or long-term operation, a dust agglomerate layer forms on the surface of the filter media. This prevents the pulse airflow from spreading evenly along the honeycomb pores, instead creating a localized concentrated force at the incompletely clogged filter media. This concentrated force exceeds the tolerance limit of the PET filaments, easily causing fiber connection point breakage in the honeycomb pores, PTFE membrane peeling, or even localized damage to the filter media, leading to dust leakage and shortening the filter cartridge's service life. Furthermore, in the case of severe clogging, the dust agglomerate layer has high hardness and poor elasticity, making it difficult to completely remove the dust from the filter media surface using only internal pulses. Instead, the airflow impact force is rebounded into the PET filament substrate, exacerbating fiber fatigue damage and thus affecting the filter cartridge's performance and lifespan.

[0004] To address this issue, a high-temperature resistant PET filament hydroentangled honeycomb structure filter cartridge and its modification method were designed to optimize the aforementioned problems. Summary of the Invention

[0005] The main objective of this invention is to provide a high-temperature resistant PET filament spunlace honeycomb structure filter cartridge and its modification method. By setting a pressure relief mechanism in the middle of the lower baffle, consisting of a pressure relief hole, a hidden groove, a sealing cover, an annular filter plate, a fixing frame, a vertical rod, a positioning block, and a third spring, the pressure control mechanism can precisely address the pressure runaway problem when the filter cartridge is clogged. When the filter material is clogged by high-humidity, sticky dust, causing the pulse cleaning airflow to fail to diffuse evenly along the honeycomb pores, resulting in a sudden increase in internal air pressure, the pressure relief mechanism can automatically respond, pushing the sealing cover open due to excessive air pressure. The pressure relief mechanism effectively dissipates concentrated local forces, preventing them from exceeding the tolerance limit of PET filaments. This prevents breakage of honeycomb fiber connections, PTFE membrane peeling, and localized damage to the filter media, ensuring the integrity of the core filtration structure and maintaining a stable filtration state. It significantly reduces the risk of dust leakage. The external dust removal mechanism, composed of a sliding groove, sliding rod, connecting rod, fourth spring, and V-groove, works in conjunction with the pressure relief mechanism. When the filter media becomes severely clogged, the pressure relief mechanism triggers, simultaneously controlling the external dust removal mechanism to drive the nylon filaments to slide against the filter media surface. This physically scrapes away the stubborn dust buildup, combining external and internal pulse cleaning. This overcomes the limitations of traditional single internal pulse cleaning, significantly improving dust removal efficiency and ensuring the filter media maintains good air permeability and filtration performance, guaranteeing stable performance. The mechanism works by sliding the nylon filaments on the mounting sleeve. Equipped with positioning balls, and together with a lifting ring, a first spring, a tension sleeve, a protrusion, a sliding hole, a second spring, and a protective sleeve, a quick-installation mechanism is formed, which greatly simplifies the disassembly and assembly process. In actual operation, the lifting ring is used to drive the tension sleeve to cooperate with the positioning balls, which can limit the mounting plate between the positioning balls and the upper pressure ring. The filter cartridge and the dust collection system can be quickly connected and disassembled without the need for complicated tools. This effectively reduces the maintenance difficulty of the filter cartridge in high-temperature environments, shortens maintenance time and costs, and significantly improves the practicality and convenience of the filter cartridge in industrial applications.

[0006] The objective of this invention can be achieved by adopting the following technical solution: A high-temperature resistant PET filament spunlace honeycomb structure filter cartridge includes an upper pressure ring, an mounting sleeve vertically fixed to the bottom end of the upper pressure ring, a fixing ring horizontally fixed to the bottom end of the mounting sleeve, and a quick-release mechanism inside the mounting sleeve for attaching and fixing the outer mounting plate to the bottom of the upper pressure ring. An inner support net is vertically fixed at the bottom of the fixing ring. The outer side of the inner support net is tightly covered with filter material. The filter material is made of high-temperature resistant PET filaments as the base material through hydroentangling process, and the surface of the filter material forms a hexagonal honeycomb grid with a side length of 0.5-2mm. A lower baffle is horizontally fixed at the bottom of the inner support net. A pressure relief mechanism is provided in the middle of the lower baffle, which is used to balance the air pressure inside and outside the filter cartridge; An external dust removal mechanism is provided on the outside of the filter material, and the external dust removal mechanism is linked with the pressure relief mechanism to achieve synchronous dust removal.

[0007] Preferably, the bottom of the upper pressure ring is provided with a high-temperature resistant rubber sealing ring, and an annular groove is provided on the outer side of the upper pressure ring.

[0008] Preferably, the quick-release mechanism includes a lifting ring, a first spring, a tension sleeve, a protrusion, a sliding hole, and a positioning ball. The lifting ring is horizontally positioned on top of the upper pressure ring. A first spring is provided between the lifting ring and the upper pressure ring, and the two ends of the first spring abut against the bottom of the upper pressure ring and the top of the tension sleeve, respectively. A tension sleeve is vertically fixed at the bottom end of the lifting ring, and the tension sleeve passes through the first spring. A protrusion is provided at the bottom end of the outer side of the tension sleeve. Sliding holes are evenly opened circumferentially on the outer wall of the mounting sleeve. Positioning balls are slidably arranged inside the sliding holes. The end of the positioning ball near the tension sleeve is in contact with the inner side wall of the protrusion. The diameter of the sliding hole away from the tension sleeve is smaller than the diameter of the positioning ball.

[0009] Preferably, the quick-release mechanism further includes a second spring and a protective sleeve. The second spring is located between the expansion sleeve and the fixing ring. The protective sleeve is vertically fixed to the top of the fixing ring. The outer side of the protective sleeve is in contact with the inner side of the expansion sleeve and the lifting ring. The second spring is sleeved on the outside of the protective sleeve.

[0010] Preferably, there are four sets of positioning beads, and the circumferential distance between adjacent sets of positioning beads is the same.

[0011] Preferably, the pressure relief mechanism includes a pressure relief hole, a concealed groove, a sealing cover, a fixing frame, a vertical rod, a positioning block, and a third spring. The pressure relief hole is axially located at the middle position of the lower baffle. The concealed groove is located at the bottom end of the pressure relief hole and communicates with it. The sealing cover is fitted into the inner top of the concealed groove and completely covers the bottom opening of the pressure relief hole. The fixing frame is horizontally fixed to the top of the lower baffle. A vertical hole is axially located at the center of the fixing frame. The vertical rod slides through the vertical hole of the fixing frame. The bottom end of the vertical rod is fixedly connected to the top of the sealing cover, and the top end of the vertical rod is fixedly connected to the bottom of the positioning block. The third spring is sleeved on the outside of the vertical rod, and both ends of the third spring abut against the top of the fixing frame and the bottom of the positioning block, respectively.

[0012] Preferably, the pressure relief mechanism further includes an annular filter plate, which is vertically fixed to the top of the sealing cover. The outer wall of the annular filter plate is tightly fitted with the inner wall of the pressure relief hole. The surface of the annular filter plate is provided with micropores with a diameter of 0.1-0.3 mm for filtering dust in the pressure relief airflow.

[0013] Preferred: The external dust removal mechanism includes a chute, a slide rod, a connecting rod, a V-shaped groove, and nylon filaments. The chute is evenly opened circumferentially on the outside of the hidden groove. The slide rod is slidably installed inside the chute. The end of the slide rod is hinged to the outside of the sealing cover. The top of the lower baffle is evenly opened circumferentially on the top, and the V-shaped groove is located directly below the filter media pleats. Nylon filaments are symmetrically arranged at the end of the slide rod away from the connecting rod. The nylon filaments pass through the inside of the V-shaped groove and are attached to the surface of the filter media. Two sets of nylon filaments slide at both ends of the V-shaped groove. The top of the nylon filaments is fixedly connected to the fixing ring.

[0014] Preferably, the external dust removal mechanism further includes a fourth spring, which is disposed between the inner end of the slide groove and the end of the slide rod, and the two ends of the fourth spring abut against the inner wall of the slide groove and the end of the slide rod, respectively, for the elastic reset of the slide rod.

[0015] This invention also provides a method for modifying a high-temperature resistant PET filament hydroentangled honeycomb structure filter cartridge, comprising the following steps: Step 1: Pretreatment of high-temperature resistant PET filament substrate. Place the PET filament in an ultrasonic cleaning device, using deionized water as the cleaning solution, and ultrasonically clean it at 40-60℃ for 15-30 minutes. After cleaning, place the PET filament in a drying oven at 100-120℃ for 2-3 hours. After drying, immerse the PET filament in a high-temperature resistant modifier for 1-2 hours. After removing it, drain off the excess modifier from the surface and set it aside for later use. Step 2: Preparation and treatment of the inner support net. Select 304 stainless steel or polyetheretherketone material to make an inner support net that matches the inner diameter of the installation sleeve. If it is made of metal, sandblast the surface of the inner support net with 80-120 mesh to enhance the adhesion with the filter material. If it is made of polymer material, coat the surface of the inner support net with a high temperature resistant adhesive coating with a thickness of 5-10μm, let it stand and cure for 1-2 hours, and then set it aside. Step 3: Hydroentangling of filter media. The PET filaments pretreated in Step 1 are evenly wrapped around the outer side of the inner support mesh treated in Step 2. The mesh is placed in a hydroentangling machine, and the hydroentangling pressure is set to 5-50MPa. The number of hydroentangling cycles is 2-3, and the angle difference between two adjacent hydroentangling cycles is 60-90°. Hexagonal honeycomb pores with a side length of 0.5-2mm are formed on the surface of the PET filaments to obtain the filter media. Step 4: Assemble the filter cartridge body. Connect the upper pressure ring, mounting sleeve, and fixing ring in sequence by welding or high-temperature adhesive. Coaxially insert the inner support net covered with filter media into the bottom of the fixing ring, so that the top of the filter media fits against the top of the fixing ring. Then fix the lower baffle to the bottom of the inner support net. Subsequently, install the quick-installation mechanism, pressure relief mechanism, and external dust removal mechanism in sequence. Step 5: PTFE film coating. Cover the outer surface of the filter material assembled in step 4 with a PTFE film with a thickness of 1-3 μm, place it in a hot press, set the hot press temperature to 180-200℃, the hot press pressure to 0.3-0.5MPa, and the hot press time to 30-60s, so that the PTFE film is tightly bonded to the filter material. Step 6: Overall curing treatment. Place the filter cartridge with the film coating completed in Step 5 into the curing oven, set the curing temperature to 150-180℃ and the curing time to 2-4h. After curing, cool it naturally to room temperature at a cooling rate of 5-10℃ / min. Finally, use compressed air to blow away the residual dust on the surface of the filter cartridge to complete the modification.

[0016] The beneficial effects of this invention are as follows: This invention provides a high-temperature resistant PET filament hydroentangled honeycomb structure filter cartridge and its modification method. By setting a pressure relief mechanism in the middle of the lower baffle, consisting of a pressure relief hole, a hidden groove, a sealing cover, an annular filter plate, a fixing frame, a vertical rod, a positioning block, and a third spring, it can accurately address the pressure runaway problem when the filter cartridge is blocked. When the filter material is blocked by high humidity and sticky dust, causing the pulse cleaning airflow to be unable to diffuse evenly along the honeycomb pores, and the internal air pressure of the filter cartridge rises sharply, the pressure relief mechanism can automatically respond. The excessive air pressure pushes the sealing cover to open and release pressure, effectively dissipating the local concentrated force and preventing it from exceeding the upper limit of the PET filament's tolerance. This prevents the honeycomb pore fiber connection point from breaking, the PTFE membrane from peeling off, and the filter material from being partially damaged, ensuring the integrity of the core filtration structure of the filter cartridge, thereby maintaining the long-term stable filtration state of the filter cartridge and significantly reducing the risk of dust leakage. By symmetrically arranging movable nylon filaments along the length of the filter media's folds, with the top of the nylon filaments connected to a fixed ring and the bottom end in a movable connection state, and combining them with a sliding groove, sliding rod, connecting rod, fourth spring, and V-groove to form an external dust removal mechanism, which is linked with a pressure relief mechanism, when the filter cartridge becomes severely clogged, the pressure relief mechanism triggers pressure relief and simultaneously controls the external dust removal mechanism to drive the nylon filaments to slide against the surface of the filter media, physically scraping the dust-laden layer that is difficult to peel off from the filter media surface. Dust removal is carried out simultaneously from the outside and with the internal pulse, breaking through the limitations of traditional single internal pulse cleaning, significantly improving the dust removal effect on the filter media surface, ensuring that the filter cartridge always maintains good air permeability and filtration performance, and ensuring its stable performance in use; By sliding positioning balls on the mounting sleeve, and combining them with a lifting ring, a first spring, a tension sleeve, a protrusion, a sliding hole, a second spring, and a protective sleeve to form a quick-installation mechanism, the disassembly and assembly process can be greatly simplified. In actual operation, the mounting plate can be limited between the positioning balls and the upper pressure ring simply by driving the tension sleeve with the lifting ring. The filter cartridge and the dust removal system can be quickly connected and disassembled without the need for complicated tools. This effectively reduces the maintenance difficulty of the filter cartridge in high-temperature environments, shortens maintenance time and costs, and significantly improves the practicality and convenience of the filter cartridge in industrial applications. Attached Figure Description

[0017] Figure 1 This is a front sectional view of a preferred embodiment of the high-temperature resistant PET filament hydroentangled honeycomb structure filter cartridge and its modification method of the present invention; Figure 2 This is a front view of a preferred embodiment of a high-temperature resistant PET filament hydroentangled honeycomb structure filter cartridge and its modification method according to the present invention; Figure 3 This is a cross-sectional view of the top structure of the fixing ring in a preferred embodiment of the high-temperature resistant PET filament hydroentangled honeycomb structure filter cartridge and its modification method of the present invention. Figure 4 This is a top front view of the fixing ring in a preferred embodiment of the high-temperature resistant PET filament hydroentangled honeycomb structure filter cartridge and its modification method of the present invention; Figure 5 This is an exploded view of the top of the fixing ring in a preferred embodiment of the high-temperature resistant PET filament hydroentangled honeycomb structure filter cartridge and its modification method of the present invention; Figure 6 This is a cross-sectional view of the mounting sleeve of a preferred embodiment of the high-temperature resistant PET filament hydroentangled honeycomb structure filter cartridge and its modification method according to the present invention; Figure 7 This is a cross-sectional view of the lower baffle in a preferred embodiment of the high-temperature resistant PET filament hydroentangled honeycomb structure filter cartridge and its modification method of the present invention. Figure 8 This is a diagram showing the connection state between the pressure relief mechanism and the external dust removal mechanism in a preferred embodiment of the high-temperature resistant PET filament hydroentangled honeycomb structure filter cartridge and its modification method according to the present invention. Figure 9 This is a nylon filament distribution diagram on the surface of the filter material in a preferred embodiment of the high-temperature resistant PET filament hydroentangled honeycomb structure filter cartridge and its modification method of the present invention.

[0018] In the diagram: 1. Upper pressure ring; 2. Mounting sleeve; 3. Retaining ring; 4. Quick-release mechanism; 401. Lifting ring; 402. First spring; 403. Expansion sleeve; 404. Protrusion; 405. Sliding hole; 406. Positioning ball; 407. Second spring; 408. Protective sleeve; 5. Internal support mesh; 6. Filter media; 7. Lower baffle; 8. Pressure relief mechanism; 801. Pressure relief hole; 802. Concealed groove; 803. Sealing cover; 804. Annular filter plate; 805. Fixing frame; 806. Vertical rod; 807. Positioning block; 808. Third spring; 9. External dust removal mechanism; 901. Slide groove; 902. Slide rod; 903. Connecting rod; 904. Fourth spring; 905. V-groove; 906. Nylon thread. Detailed Implementation

[0019] To enable those skilled in the art to more clearly understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0020] like Figures 1-9 As shown, this embodiment provides a high-temperature resistant PET filament spunlace honeycomb structure filter cartridge, including an upper pressure ring 1, an mounting sleeve 2 vertically fixed at the bottom end of the upper pressure ring 1, a fixing ring 3 horizontally fixed at the bottom end of the mounting sleeve 2, and a quick-installation mechanism 4 provided inside the mounting sleeve 2, which is used to fit and fix the outer mounting plate to the bottom of the upper pressure ring 1. The bottom of the fixing ring 3 is vertically fixed with an inner support net 5. The outer side of the inner support net 5 is tightly covered with filter material 6. The filter material 6 is made of high temperature resistant PET filament as the base material by hydroentangling process, and the surface of the filter material 6 forms a hexagonal honeycomb grid with a side length of 0.5-2mm. The bottom end of the inner support net 5 is horizontally fixed with a lower baffle 7. A pressure relief mechanism 8 is provided at the middle position of the lower baffle 7. The pressure relief mechanism 8 is used to balance the air pressure inside and outside the filter cartridge. An external dust removal mechanism 9 is provided on the outside of the filter material 6, and the external dust removal mechanism 9 and the pressure relief mechanism 8 are linked to achieve synchronous dust removal.

[0021] Overall working principle: Installation and fixing stage: The operator aligns the filter cartridge mounting sleeve 2 with the mounting hole of the external mounting plate, presses down the lifting ring 401, compresses the first spring 402 and the second spring 407, causing the expansion sleeve 403 to move down, so that the protrusion 404 on the outside of the expansion sleeve 403 disengages from the contact state with the positioning ball 406, and the positioning ball 406 retracts into the sliding hole 405. At this time, the mounting sleeve 2 is fully inserted into the mounting plate hole, and the high-temperature resistant rubber sealing ring at the bottom of the upper pressure ring 1 is in contact with the mounting plate. After the top surface is sealed, the first spring 402 and the second spring 407 release potential energy to push the expansion sleeve 403 upward. The inclined surface of the protrusion 404 squeezes the positioning ball 406, causing part of the positioning ball 406 to extend out of the sliding hole 405 and be stuck on the bottom surface of the mounting plate. The mounting plate is limited between the upper pressure ring 1 and the positioning ball 406, completing the fixed docking of the filter cartridge and the dust removal system. During this process, the protective sleeve 408 ensures that the expansion sleeve 403 does not have radial displacement when it moves, avoiding component jamming.

[0022] Normal filtration stage: After the dust removal system is started, the dust-laden airflow enters from the outside of the filter media 6. The filter media 6 uses high-temperature resistant PET filaments as the base material and is made of a hexagonal honeycomb structure with a side length of 0.5-2mm through hydroentangling process to perform the filtration function. At the same time, the 1-3μm PTFE film on the outer surface of the filter media 6 further enhances dust interception. After filtration, the clean airflow passes through the inner support net 5 and is finally discharged from the top of the filter cartridge. During this stage, the pressure relief mechanism 8 is in a sealed state. The third spring 808 applies an upward pre-pressure to the sealing cover 803 through the positioning block 807 and the vertical rod 806, so that the sealing cover 803 fits tightly against the top of the hidden groove 802 and completely covers the bottom opening of the pressure relief hole 801, ensuring that all the airflow is filtered by the filter media 6. The annular filter plate 804 simultaneously blocks external impurities from entering the interior of the filter cartridge from the pressure relief hole 801.

[0023] Emergency Blockage Stage: When filter material 6 becomes blocked due to long-term accumulation of high-humidity, sticky dust, the internal air pressure of the filter cartridge rises sharply. When the air pressure exceeds the pre-pressure threshold of the third spring 808, the high-pressure airflow pushes the sealing cover 803 downward, causing the vertical rod 806 and positioning block 807 to move synchronously and compress the third spring 808. The bottom opening of the pressure relief hole 801 opens, and the high-pressure airflow is discharged through the pressure relief hole 801 to achieve internal and external air pressure balance, avoiding local pressure exceeding the upper limit of PET filament tolerance, which could lead to breakage of honeycomb pore fiber connection points and peeling of PTFE film. At the same time, during the downward movement of the sealing cover 803, the hinged connecting rod 903 pushes the slide rod 902 to slide radially outward in the slide groove 901, compressing the fourth spring 904. The slide rod 902 drives the nylon filament 906 at the end to slide along the V-shaped groove 905, corresponding to the pleated position of the filter material 6. The nylon filament 906 adheres to the surface of the filter material 6 to physically scrape the dust-laden layer, and together with the internal pulse cleaning, achieves synchronous dust removal inside and outside, greatly improving the dust removal effect.

[0024] Maintenance and disassembly stage: When the filter cartridge needs to be replaced or maintained, the operator presses down on the lifting ring 401 to release the pressure of the protrusion 404 on the positioning ball 406. Under the reaction force of the mounting plate, the positioning ball 406 retracts into the sliding hole 405. At this time, the annular groove on the outside of the upper pressure ring 1 is pulled upward to remove the filter cartridge from the mounting plate as a whole. The whole process does not require complicated tools, reducing the difficulty of maintenance in high temperature environments.

[0025] In this embodiment, the bottom of the upper pressure ring 1 is provided with a high-temperature resistant rubber sealing ring, and an annular groove is provided on the outer side of the upper pressure ring 1.

[0026] Local working principle: After installation, the high-temperature resistant rubber sealing ring at the bottom of the upper pressure ring 1 is squeezed between the upper pressure ring 1 and the top surface of the mounting plate to form an elastic sealing surface. The function of the annular groove is to facilitate the lifting of the upper pressure ring 1 during disassembly.

[0027] In this embodiment, the quick-installation mechanism 4 includes a lifting ring 401, a first spring 402, a stretch sleeve 403, a protrusion 404, a sliding hole 405, and a positioning ball 406. The lifting ring 401 is horizontally disposed on the top of the upper pressure ring 1. The first spring 402 is disposed between the lifting ring 401 and the upper pressure ring 1, and the two ends of the first spring 402 abut against the bottom of the upper pressure ring 1 and the top of the stretch sleeve 403, respectively. The bottom end of the lifting ring 401 is vertically fixed with the stretch sleeve 403, which passes through the first spring 402. The bottom end of the outer side of the stretch sleeve 403 is provided with a protrusion 404. The outer side wall of the mounting sleeve 2 is uniformly provided with sliding holes 405 along the circumference. The positioning ball 406 is slidably disposed inside the sliding hole 405. The end of the positioning ball 406 near the stretch sleeve 403 is in contact with the inner side wall of the protrusion 404. The diameter of the end of the sliding hole 405 away from the stretch sleeve 403 is smaller than the diameter of the positioning ball 406.

[0028] Partial working principle: The operator aligns the mounting sleeve 2 of the filter cartridge with the mounting hole of the external mounting plate, and then inserts the entire filter cartridge into it. Since the protrusion 404 initially contacts the positioning ball 406 and pushes the positioning ball 406 outward, the filter cartridge cannot be fully inserted and is blocked by the positioning ball 406. Then, the operator presses down on the lifting ring 401, compressing the first spring 402 and controlling the downward movement of the expansion sleeve 403 and the protrusion 404, releasing the positioning state of the positioning ball 406. 06 retracts into the sliding hole 405. Then, the sealing ring at the bottom of the upper pressure ring 1 fits against the top surface of the mounting plate. After the mounting sleeve 2 is fully inserted into the mounting plate hole, the lifting ring 401 is released. The first spring 402 releases potential energy to push the expansion sleeve 403 upward. The inclined surface of the protrusion 404 squeezes the positioning ball 406. The positioning ball 406 slides outward in the sliding hole 405. Finally, part of the ball extends out of the sliding hole 405 and gets stuck on the bottom surface of the mounting plate, limiting the mounting plate between the bottom of the upper pressure ring 1 and the positioning ball 406, thus completing the fixation. During the disassembly stage, press down on the lifting ring 401 again with your thumb to release the positioning state of the positioning ball 406. Then, lift the upper pressure ring 1 with your other fingers. The reaction force of the external mounting plate on the positioning ball 406 pushes the ball to retract into the sliding hole 405, breaking away from the limit of the mounting plate, and the entire filter cartridge is pulled out.

[0029] In this embodiment, the quick-release mechanism 4 also includes a second spring 407 and a protective sleeve 408. The second spring 407 is located between the expansion sleeve 403 and the fixing ring 3. The protective sleeve 408 is vertically fixed to the top of the fixing ring 3. The outer side of the protective sleeve 408 is in contact with the inner side of the expansion sleeve 403 and the lifting ring 401. The second spring 407 is sleeved on the outside of the protective sleeve 408.

[0030] Local working principle: When the lifting ring 401 is moved down, the second spring 407 is compressed by the expansion sleeve 403, which stores potential energy together with the first spring 402. After being released, the first spring 402 and the second spring 407 form a double restoring force to ensure that the expansion sleeve 403 moves up quickly and stably. The use of protective sleeve 408 can prevent radial displacement of expansion sleeve 403 when it moves up and down, and ensure that protrusion 404 is always aligned with positioning ball 406 to prevent jamming.

[0031] In this embodiment, four sets of positioning beads 406 are provided, and the circumferential distance between adjacent sets of positioning beads 406 is the same.

[0032] Local working principle: During installation and fixing, the four sets of balls extend outward synchronously, and the limiting force on the mounting plate is evenly distributed along the circumference, avoiding deformation of the mounting plate due to excessive local force.

[0033] In this embodiment, the pressure relief mechanism 8 includes a pressure relief hole 801, a concealed groove 802, a sealing cover 803, a fixing frame 805, a vertical rod 806, a positioning block 807, and a third spring 808. The pressure relief hole 801 is axially located at the middle position of the lower baffle 7. The concealed groove 802 is located at the bottom end of the pressure relief hole 801 and communicates with it. The sealing cover 803 is fitted into the inner top of the concealed groove 802 and completely covers the bottom opening of the pressure relief hole 801. The fixing frame 805 is horizontally fixed to the top of the lower baffle 7. A vertical hole is provided axially at the center of the fixing frame 805. The vertical rod 806 is slidably inserted into the vertical hole of the fixing frame 805. The bottom end of the vertical rod 806 is fixedly connected to the top of the sealing cover 803, and the top end of the vertical rod 806 is fixedly connected to the bottom of the positioning block 807. The third spring 808 is sleeved on the outside of the vertical rod 806, and the two ends of the third spring 808 abut against the top of the fixing frame 805 and the bottom of the positioning block 807, respectively.

[0034] Local working principle: Under normal filtration conditions, the third spring 808 is in a naturally extended state. The positioning block 807 and the vertical rod 806 apply an upward pre-pressure to the sealing cover 803. The sealing cover 803 fits tightly against the inner top of the hidden groove 802, completely covering the bottom opening of the pressure relief hole 801, blocking the airflow inside the filter cartridge from leaking from the pressure relief hole 801, and ensuring that all airflow is filtered by the filter material 6. In the blocked and depressurized state, the blockage of filter media 6 causes a sudden increase in internal air pressure, exceeding the air pressure threshold corresponding to the preload of the third spring 808. The high-pressure airflow acts on the top surface of the sealing cover 803, generating a downward thrust. When the thrust is greater than the preload of the third spring 808, the sealing cover 803 drives the vertical rod 806 and the positioning block 807 to move down simultaneously. The third spring 808 is compressed, and the bottom opening of the pressure relief hole 801 opens. The high-pressure airflow inside the filter cartridge is discharged from the pressure relief hole 801, quickly balancing the internal and external air pressure and preventing the local pressure from exceeding the upper limit of the PET filament's tolerance. After the air pressure is balanced, the third spring 808 releases its potential energy, pushing the positioning block 807, the vertical rod 806, and the sealing cover 803 to reset, resealing the pressure relief hole 801 and restoring normal filtration.

[0035] In this embodiment, the pressure relief mechanism 8 also includes an annular filter plate 804, which is vertically fixed to the top of the sealing cover 803. The outer sidewall of the annular filter plate 804 is tightly fitted with the inner sidewall of the pressure relief hole 801. The surface of the annular filter plate 804 is provided with micropores with a diameter of 0.1-0.3 mm for filtering dust in the pressure relief airflow.

[0036] Local working principle: The annular filter plate 804 can prevent gas outside the filter cartridge from entering the interior of the filter cartridge through the pressure relief hole 801, thus ensuring the dustproof effect.

[0037] In this embodiment, the external dust removal mechanism 9 includes a chute 901, a slide rod 902, a connecting rod 903, a V-groove 905, and nylon filaments 906. The chute 901 is evenly opened around the outside of the hidden groove 802. The slide rod 902 is slidably arranged inside the chute 901. The end of the slide rod 902 is hinged to the outside of the sealing cover 803. The top of the lower baffle 7 is evenly opened around the circumference of the V-groove 905, and the V-groove 905 is located directly below the pleats of the filter material 6. The end of the slide rod 902 away from the connecting rod 903 is symmetrically provided with nylon filaments 906. The nylon filaments 906 pass through the inside of the V-groove 905 and are attached to the surface of the filter material 6. The two sets of nylon filaments 906 slide at both ends of the V-groove 905 respectively. The top end of the nylon filaments 906 is fixedly connected to the fixing ring 3.

[0038] Local working principle: When the filter cartridge is clogged, the pressure relief mechanism 8 is activated, and the sealing cover 803 moves downward. This moves the sliding rod 902 through the hinged connecting rod 903. The sliding rod 902 slides radially outward in the sliding groove 901, causing the nylon thread 906 at its end to move synchronously. The nylon thread 906 passes through the V-shaped groove 905 and its top end is fixed to the fixing ring 3. Therefore, when the sliding rod 902 moves the nylon thread 906, the nylon thread 906 will adhere to the surface of the filter material 6, especially sliding inside the pleats. The nylon thread 906 has a certain elasticity, which can ensure the adhesion effect. The nylon thread 906 physically scrapes the dust agglomerate layer on the surface of the filter material 6, scraping and removing the hard shell-like dust that is difficult to be peeled off by the internal pulse cleaning. In addition, when the nylon thread 906 is in the reset state, it is vertically located inside the pleats, which can ensure the overall shape of the filter material 6.

[0039] In this embodiment, the external dust removal mechanism 9 also includes a fourth spring 904. The fourth spring 904 is disposed between the inner end of the slide groove 901 and the end of the slide rod 902, and the two ends of the fourth spring 904 abut against the inner wall of the slide groove 901 and the end of the slide rod 902, respectively, for the elastic reset of the slide rod 902.

[0040] Local working principle: The fourth spring 904 can store reset potential energy when the pressure is released, and quickly reset the slide rod 902 after the pressure is released.

[0041] like Figures 1-9 As shown in the figure, this embodiment provides a modification method for a high-temperature resistant PET filament spunlace honeycomb structure filter cartridge. The process is as follows: Step 1: Pretreatment of high-temperature resistant PET filament substrate. Place the PET filament in an ultrasonic cleaning device, using deionized water as the cleaning solution, and ultrasonically clean it at 40-60℃ for 15-30 minutes. After cleaning, place the PET filament in a drying oven at 100-120℃ for 2-3 hours. After drying, immerse the PET filament in a high-temperature resistant modifier for 1-2 hours. After removing it, drain off the excess modifier from the surface and set it aside for later use. Step 2: Preparation and treatment of inner support net 5. Select 304 stainless steel or polyetheretherketone material to make inner support net 5 that matches the inner diameter of installation sleeve 2. If it is made of metal, sandblast the surface of inner support net 5 with 80-120 mesh to enhance the adhesion with filter material 6. If it is made of polymer material, coat the surface of inner support net 5 with a high temperature resistant adhesive coating with a thickness of 5-10μm, let it stand and cure for 1-2 hours, and set aside for later use. Step 3: Hydroentangling of filter material 6. The PET filaments pretreated in step 1 are evenly wrapped around the outer side of the inner support mesh 5 treated in step 2, and placed in a hydroentangling equipment. The hydroentangling pressure is set to 5-50MPa, the number of hydroentangling times is 2-3, and the angle difference between two adjacent hydroentangling times is 60-90°. Hexagonal honeycomb pores with a side length of 0.5-2mm are formed on the surface of the PET filaments to obtain filter material 6. Step 4: Assemble the filter cartridge body. Connect the upper pressure ring 1, mounting sleeve 2, and fixing ring 3 in sequence by welding or high-temperature adhesive. Insert the inner support net 5, which is covered with filter media 6, into the bottom of the fixing ring 3 coaxially, so that the top of the filter media 6 is in contact with the top of the fixing ring 3. Then fix the lower baffle 7 to the bottom of the inner support net 5. Then install the quick-installation mechanism 4, the pressure relief mechanism 8, and the external dust removal mechanism 9 in sequence. Step 5: PTFE film coating. Cover the outer surface of the filter material 6 assembled in step 4 with a PTFE film with a thickness of 1-3 μm, place it in a hot press, set the hot press temperature to 180-200℃, the hot press pressure to 0.3-0.5MPa, and the hot press time to 30-60s, so that the PTFE film is tightly bonded to the filter material 6. Step 6: Overall curing treatment. Place the filter cartridge with the film coating completed in Step 5 into the curing oven, set the curing temperature to 150-180℃ and the curing time to 2-4h. After curing, cool it naturally to room temperature at a cooling rate of 5-10℃ / min. Finally, use compressed air to blow away the residual dust on the surface of the filter cartridge to complete the modification.

[0042] The above description is merely a further embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and concept of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A high temperature resistant PET filament spun honeycomb structure filter cartridge comprising an upper compression ring (1), characterized in that: The bottom end of the upper pressure ring (1) is vertically fixed with a mounting sleeve (2), and the bottom end of the mounting sleeve (2) is horizontally fixed with a fixing ring (3). The mounting sleeve (2) is provided with a quick-installation mechanism (4), which is used to attach and fix the outer mounting plate to the bottom of the upper pressure ring (1). The bottom of the fixing ring (3) is vertically fixed with an inner support net (5), and the outer side of the inner support net (5) is tightly covered with filter material (6). The filter material (6) is made of high temperature resistant PET filament as the base material by hydroentangling process, and the surface of the filter material (6) forms a hexagonal honeycomb grid with a side length of 0.5-2mm. The bottom end of the inner support net (5) is horizontally fixed with a lower baffle (7). A pressure relief mechanism (8) is provided at the middle position of the lower baffle (7). The pressure relief mechanism (8) is used to balance the air pressure inside and outside the filter cartridge. An external dust removal mechanism (9) is provided on the outside of the filter material (6), and the external dust removal mechanism (9) and the pressure relief mechanism (8) are linked to achieve synchronous dust removal. The quick-release mechanism (4) includes a lifting ring (401), a first spring (402), a tension sleeve (403), a protrusion (404), a sliding hole (405), and a positioning ball (406). The lifting ring (401) is horizontally positioned on top of the upper pressure ring (1). The first spring (402) is provided between the lifting ring (401) and the upper pressure ring (1), and the two ends of the first spring (402) abut against the bottom of the upper pressure ring (1) and the top of the tension sleeve (403), respectively. The tension sleeve is vertically fixed at the bottom end of the lifting ring (401). 403), the expansion sleeve (403) passes through the first spring (402), the bottom of the outer side of the expansion sleeve (403) is provided with a protrusion (404), the outer side wall of the mounting sleeve (2) is evenly provided with sliding holes (405) along the circumference, and the interior of the sliding holes (405) is slidably provided with positioning balls (406). The end of the positioning ball (406) near the expansion sleeve (403) is in contact with the inner side wall of the protrusion (404), and the diameter of the end of the sliding hole (405) away from the expansion sleeve (403) is smaller than the diameter of the positioning ball (406); The quick-release mechanism (4) also includes a second spring (407) and a protective sleeve (408). The second spring (407) is located between the expansion sleeve (403) and the fixing ring (3). The protective sleeve (408) is vertically fixed to the top of the fixing ring (3). The outer side of the protective sleeve (408) is in contact with the inner side of the expansion sleeve (403) and the lifting ring (401). The second spring (407) is sleeved on the outside of the protective sleeve (408). The pressure relief mechanism (8) includes a pressure relief hole (801), a concealed groove (802), a sealing cover (803), a fixing frame (805), a vertical rod (806), a positioning block (807), and a third spring (808). The pressure relief hole (801) is axially located at the middle position of the lower baffle (7). The concealed groove (802) is located at the bottom end of the pressure relief hole (801) and communicates with it. The sealing cover (803) is fitted into the inner top of the concealed groove (802) and completely covers the bottom opening of the pressure relief hole (801). The fixing frame (805) is horizontally fixed to the top of the lower baffle (7). A vertical hole is provided in the center of the fixing frame (805) along the axial direction. The vertical rod (806) slides through the vertical hole of the fixing frame (805). The bottom end of the vertical rod (806) is fixedly connected to the top of the sealing cover (803). The top end of the vertical rod (806) is fixedly connected to the bottom of the positioning block (807). The third spring (808) is sleeved on the outside of the vertical rod (806), and the two ends of the third spring (808) abut against the top of the fixing frame (805) and the bottom of the positioning block (807) respectively.

2. A high temperature resistant PET filament spun honeycomb structure filter cartridge according to claim 1, characterized in that: The bottom of the upper pressure ring (1) is provided with a high temperature resistant rubber sealing ring, and an annular groove is provided on the outer side of the upper pressure ring (1).

3. A high temperature resistant PET filament spun honeycomb structure filter cartridge according to claim 1, characterized in that: There are four sets of positioning balls (406), and the circumferential distance between two adjacent sets of positioning balls (406) is the same.

4. A high temperature resistant PET filament spun honeycomb structure filter cartridge according to claim 1, characterized in that: The pressure relief mechanism (8) also includes an annular filter plate (804), which is vertically fixed on the top of the sealing cover (803). The outer side wall of the annular filter plate (804) is tightly fitted with the inner side wall of the pressure relief hole (801). The surface of the annular filter plate (804) is provided with micropores with a diameter of 0.1-0.3 mm for filtering dust in the pressure relief airflow.

5. A high temperature resistant PET filament spun honeycomb structure filter cartridge according to claim 1 or 4, characterized in that: The external dust removal mechanism (9) includes a chute (901), a slide rod (902), a connecting rod (903), a V-groove (905), and nylon wire (906). The chute (901) is evenly opened on the outside of the hidden groove (802) along the circumference. The slide rod (902) is slidably installed inside the chute (901). The end of the slide rod (902) is hinged to the outside of the sealing cover (803) and the connecting rod (903) is installed. The top of the lower baffle (7) is circumferentially... V-shaped grooves (905) are evenly distributed and located directly below the pleats of the filter material (6). Nylon filaments (906) are symmetrically arranged at the end of the slide rod (902) away from the connecting rod (903). The nylon filaments (906) pass through the inside of the V-shaped grooves (905) and are attached to the surface of the filter material (6). Two sets of nylon filaments (906) slide at both ends of the V-shaped grooves (905) respectively. The top end of the nylon filaments (906) is fixedly connected to the fixing ring (3).

6. A high temperature resistant PET filament spun honeycomb structure filter cartridge according to claim 5, characterized in that: The external dust removal mechanism (9) also includes a fourth spring (904), which is located between the inner end of the slide groove (901) and the end of the slide rod (902). The two ends of the fourth spring (904) abut against the inner wall of the slide groove (901) and the end of the slide rod (902) respectively, for the elastic reset of the slide rod (902).

7. A method for modifying a high-temperature resistant PET filament spunlace honeycomb structure filter cartridge, based on the high-temperature resistant PET filament spunlace honeycomb structure filter cartridge according to claim 6, characterized in that, Includes the following steps: Step 1: Pretreatment of high-temperature resistant PET filament substrate. Place the PET filament in an ultrasonic cleaning device, using deionized water as the cleaning solution, and ultrasonically clean it at 40-60℃ for 15-30 minutes. After cleaning, place the PET filament in a drying oven at 100-120℃ for 2-3 hours. After drying, immerse the PET filament in a high-temperature resistant modifier for 1-2 hours. After removing it, drain off the excess modifier from the surface and set it aside for later use. Step 2: Preparation and treatment of inner support net (5). Select 304 stainless steel or polyether ether ketone material to make inner support net (5) that matches the inner diameter of the mounting sleeve (2). If it is made of metal, perform 80-120 mesh sandblasting on the surface of inner support net (5) to enhance the adhesion with filter material (6). If it is made of polymer material, coat the surface of inner support net (5) with a high temperature resistant adhesive coating of 5-10 μm thickness, let it stand and cure for 1-2 hours, and then set aside. Step 3: Hydroentangling of filter material (6) The PET filaments pretreated in step 1 are evenly wrapped around the outer side of the inner support mesh (5) treated in step 2 and placed in the hydroentangling equipment. The hydroentangling pressure is set to 5-50MPa, the number of hydroentangling times is 2-3, and the angle difference between two adjacent hydroentangling times is 60°-90°. Hexagonal honeycomb pores with a side length of 0.5-2mm are formed on the surface of the PET filaments to obtain filter material (6). Step 4: Assemble the filter cartridge body. Connect the upper pressure ring (1), mounting sleeve (2), and fixing ring (3) in sequence by welding or high-temperature adhesive. Insert the inner support net (5) covered with filter material (6) into the bottom of the fixing ring (3) coaxially, so that the top of the filter material (6) fits against the bottom of the fixing ring (3). Then fix the lower baffle (7) to the bottom of the inner support net (5). Then install the quick-installation mechanism (4), pressure relief mechanism (8), and external dust removal mechanism (9) in sequence. Step 5: PTFE film coating. Cover the outer surface of the filter material (6) assembled in step 4 with a PTFE film with a thickness of 1-3 μm, place it in a hot press, set the hot press temperature to 180-200℃, the hot press pressure to 0.3-0.5MPa, and the hot press time to 30-60s, so that the PTFE film is tightly bonded to the filter material (6); Step 6: Overall curing treatment. Place the filter cartridge with the film coating completed in Step 5 into the curing oven, set the curing temperature to 150-180℃ and the curing time to 2-4h. After curing, cool it naturally to room temperature at a cooling rate of 5-10℃ / min. Finally, use compressed air to blow away the residual dust on the surface of the filter cartridge to complete the modification.

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