A filter cartridge

Abstract

The application relates to the technical field of filter cartridges, in particular to a filter cartridge which comprises a cylindrical filter screen, a bottom plate, a pop-up device, a bag and a limiting piece, the bottom plate is coaxially connected to the inner wall of the bottom end of the filter screen, the pop-up device is installed on the side of the bottom plate far from the filter screen, the bottom plate is provided with the limiting piece for limiting the pop-up of the bag by the pop-up device, the pop-up device is installed with the bag, and the pop-up device is configured to drive the bag to pop up along the outer side wall of the filter screen from bottom to top when the limiting piece is removed from the pop-up device; the bag is matched with the pop-up device to form a wrapping state in the pop-up process, so that the filter screen can be wrapped. The structure design can automatically pop up the bag to wrap the filter screen without manual intervention, not only effectively prevents dust leakage during the dismounting of the filter cartridge, but also avoids the explosion caused by the manual intervention and the dust leakage under the action of static electricity, and causes the safety hidden danger.

Description

Technical Field

[0001] This application relates to the field of filter cartridge technology, and in particular to a filter cartridge. Background Technology

[0002] Air filters, as indispensable air purification equipment in industrial production, are widely used in chemical, pharmaceutical, and food processing industries. Their working principle is to purify the air by intercepting particulate matter or harmful substances in the air using filter media. The role of air filters is particularly important in industries handling hazardous particles, such as the nuclear and chemical industries, where filters need to efficiently intercept toxic and harmful particles to ensure a safe and healthy production environment. Regular replacement of air filters is crucial to ensuring their performance and efficiency. This process involves disassembling the old filter and installing the new one, and the disassembly process directly affects the safety of the working environment and the efficiency of equipment maintenance. Therefore, the risk of dust leakage must be strictly controlled during operation.

[0003] To address dust leakage during the disassembly of existing filter cartridges, several methods are typically employed: First, manual operation involves placing a plastic bag directly over the filter cartridge and manually securing it to prevent dust from falling off. Second, a simple sealing cover is used to temporarily secure the filter cartridge with tape or other methods to reduce dust dispersion. While these methods can alleviate dust leakage to some extent, they are relatively simple to implement and require a high level of technical skill from the operators.

[0004] However, the above methods generally have significant drawbacks. In practice, the manual bagging and sealing of the filter cartridges can easily lead to accidental contact with the filter cartridge, causing dust to fall and leak. For some combustible dusts (such as corn flour, milk powder, starch, glutinous rice flour, etc.), and especially flammable particles from certain chemical raw materials in some factories, the human body may generate static electricity, especially when rubbing against the bag. If the filter cartridge is accidentally touched and dust leaks, it could potentially trigger an explosion under the influence of static electricity, posing a serious safety hazard and threatening the health and safety of workers. Therefore, how to effectively prevent dust leakage and ensure safety during filter cartridge disassembly, especially in scenarios involving hazardous particles, has become an urgent technical problem to be solved. Summary of the Invention

[0005] To effectively prevent dust leakage during filter cartridge disassembly without human intervention, avoid explosions caused by dust leakage due to static electricity from the human body, and improve operational safety, a filter cartridge disassembly device and system are provided.

[0006] A filter cartridge includes a cylindrical filter screen, a base plate, a pop-out device, a sleeve, and a limiting member. The base plate is coaxially connected to the inner wall of the bottom end of the filter screen. The pop-out device is installed on the side of the base plate away from the filter screen. The base plate is provided with the limiting member that restricts the pop-out device from popping out the sleeve. The pop-out device is equipped with the sleeve. The pop-out device is configured such that when the limiting member is released from restricting the pop-out device, it can drive the sleeve to pop out from bottom to top along the outer wall of the filter screen. The sleeve cooperates with the pop-out device to form a covering state during the pop-out process, thereby wrapping the filter screen.

[0007] By adopting the above technical solution, when the filter cartridge needs to be disassembled, the restriction on the ejection device is first released. At this time, the ejection device, due to its stored elastic potential energy, drives the bag to quickly eject from bottom to top along the outer wall of the filter screen. Because the bag and the ejection device cooperate, they can tightly fit the outer wall of the filter screen during the ejection process, thus forming a complete covering. This design ensures that the filter screen is completely wrapped during disassembly, effectively preventing internal dust from leaking into the external environment during operation. In addition, since the entire process does not require manual bagging or temporary sealing, it avoids the possibility of dust falling due to accidental contact during human operation, and the static electricity that may be generated between the operator or the bag, significantly improving the safety of the disassembly process. Especially in scenarios involving hazardous particles, this design can effectively reduce the possibility of dust leakage, thereby reducing the risk of explosion caused by static electricity and protecting the health and safety of workers.

[0008] Preferably, the ejection device includes a mounting plate, a clamping ring, and an elastic element. The mounting plate is installed on the side of the base plate away from the filter screen and forms a receiving cavity with the base plate to accommodate the bag. The clamping ring is used to clamp the opening of the bag and is coaxially disposed on the outer wall of the filter screen. The two ends of the elastic element are respectively connected to the clamping ring and the mounting plate. When the filter cylinder is in normal use, the limiting member presses against the clamping ring, the elastic element is in a compressed state, and the bag is accommodated in the receiving cavity. When the limiting member is released from the clamping ring, the clamping ring clamps the bag and ejects it from bottom to top along the outer wall of the filter screen.

[0009] By adopting the above technical solution, when the filter cartridge needs to be disassembled, the restriction on the clamping ring is first released. At this time, the elastic element, which was originally in a compressed state, quickly pushes the clamping ring along the outer wall of the filter screen from bottom to top due to the elastic restoring force. During the movement, the clamping ring causes the bag to pop out of the receiving cavity and gradually cover the outer surface of the filter screen. Because the clamping ring and the bag opening are tightly fitted, the bag can stably unfold and wrap around the filter screen, thereby effectively preventing dust inside the filter screen from leaking into the external environment during disassembly. This design not only simplifies the disassembly operation, eliminates the need for manual bagging, and avoids contact with static electricity, but also significantly improves the safety of the disassembly process. It is particularly suitable for scenarios involving hazardous particles, effectively preventing the risk of explosion or pollution that may be caused by dust diffusion.

[0010] Preferably, the elastic element is a spring, which is coaxially arranged with the filter screen, and the inner diameter of the spring is larger than the outer diameter of the filter screen.

[0011] By adopting the above technical solution, the spring, as an elastic element, is coaxially arranged with the filter screen and its inner diameter is larger than the outer diameter of the filter screen. This design ensures that the spring will not interfere with the filter screen during compression and ejection, thereby ensuring that the bag can be ejected smoothly.

[0012] Preferably, the inner diameter of the clamping ring is larger than the outer diameter of the filter screen.

[0013] By adopting the above technical solution, the inner diameter of the clamping ring is larger than the outer diameter of the filter screen, further preventing the clamping ring from getting stuck when moving from bottom to top along the outer wall of the filter screen. Since the entire device can automatically complete the bagging and wrapping action without manual intervention, the risk of dust leakage is greatly reduced, and operational safety is improved.

[0014] Preferably, the inner wall of the clamping ring is a, the outer wall diameter of the filter screen is b, and the range of ab is 5mm-10mm.

[0015] By adopting the above technical solution, a certain difference range is maintained between the inner diameter of the clamping ring and the outer diameter of the filter screen, specifically 5mm-10mm. This design allows the clamping ring to slide smoothly along the outer wall of the filter screen during the bag ejection process, while preventing the bag from shaking and hitting the outer surface of the filter screen during ejection due to excessively small gaps, and avoiding excessively large gaps that would affect the volume of the filter cartridge and thus affect its installation. This gap range design ensures that, to a certain extent, dust falling due to contact between the sealing ring and the outer surface of the filter screen during ejection is reduced, improving the reliability of the ejection action, and thus ensuring the safety and efficiency of the entire disassembly process.

[0016] Preferably, the limiting member includes at least one limiting protrusion, and the outer side of the base plate is provided with a limiting groove corresponding to the limiting protrusion. Each limiting protrusion is rotatably installed in the limiting groove for abutting against the clamping ring. When the limiting protrusion is flipped over and accommodated in the limiting groove, the clamping ring pops out from bottom to top.

[0017] By adopting the above technical solution, the cooperative design of the limiting protrusion and the limiting groove can effectively control the movement of the clamping ring. When the filter cartridge is working normally, the limiting protrusion abuts against the clamping ring, restricting its upward movement and ensuring that the bag remains within the receiving cavity, preventing accidental ejection. When the filter cartridge needs to be disassembled, by flipping the limiting protrusion and placing it in the limiting groove, the clamping ring loses its restriction and, under the elastic force of the elastic element, quickly ejects from bottom to top along the outer wall of the filter screen, causing the bag to unfold synchronously and form a wrapped state along the outer wall of the filter screen. This design not only achieves rapid wrapping of the filter screen but also effectively prevents dust leakage during disassembly, reduces human intervention, and improves the safety and convenience of operation.

[0018] Preferably, the number of the limiting protrusions is two, and the two limiting protrusions are symmetrical and horizontally arranged.

[0019] By adopting the above technical solution, the number of limiting protrusions is set to two, symmetrically and horizontally arranged, which enables the ejection device to be subjected to more even force when restricted. Under normal use of the filter cartridge, the limiting members press against the clamping ring, keeping the elastic element in a compressed state, thus ensuring that the bag is stably accommodated in the receiving cavity without accidental ejection. When it is necessary to release the restriction, the two symmetrically arranged limiting members operate simultaneously, avoiding the problem of the clamping ring tilting or shaking due to uneven force on one side, thus ensuring that the clamping ring can smoothly eject from bottom to top along the outer wall of the filter screen. This design not only improves the convenience of operation but also effectively reduces the risk of dust leakage that may be caused by structural imbalance, further enhancing the safety and reliability of the filter cartridge disassembly process.

[0020] Preferably, the bag opening ring has a through cavity, through which a pull rope with an adjustable opening size is threaded.

[0021] By adopting the above technical solution, the bag opening is annularly designed with a cavity, and a pull-out rope is threaded through the cavity, allowing the pull-out rope to adjust the size of the bag opening. When the ejector device drives the bag to eject from bottom to top along the outer wall of the filter screen, the pull-out rope can be pre-tightened or loosened, thereby precisely controlling the state of the bag opening. This design ensures that the bag fits tightly during the process of wrapping the filter screen, effectively preventing dust leakage from the opening. At the same time, the adjustability of the pull-out rope allows for further adjustment of the opening size after the bag is ejected, enhancing the wrapping effect on the filter screen and avoiding dust escape problems caused by an overly loose bag. In addition, when disassembling the filter cartridge, the operator can quickly seal it by simply pulling the pull-out rope, improving the safety and convenience of the operation.

[0022] Preferably, the clamping ring is provided with a gap and a locking ring, the locking ring is located at the material outlet of the gap, and the bag opening passes through the gap until the locking ring locks the bag opening.

[0023] By adopting the above technical solution, the clamping ring is equipped with a gap and a locking ring, allowing the bag opening to easily pass through the gap and be fixed at the locking ring. Specifically, when the bag opening passes through the gap, the locking ring is located at the discharge port of the gap, and its structural design effectively prevents the bag from slipping, thus firmly locking the bag opening onto the clamping ring. This design not only simplifies the assembly process between the bag and the clamping ring but also ensures that the bag will not loosen during subsequent ejection, thereby improving the reliability of the entire filter cartridge disassembly process. In addition, due to the limiting effect of the locking ring, the bag opening is evenly stressed, avoiding bag damage or detachment caused by uneven local stress, further enhancing the safety and stability of the device.

[0024] Preferably, both the clamping ring and the bag opening are provided with strong magnetic blocks, which tightly attract the clamping ring and the bag opening.

[0025] By employing the above technical solution, strong magnetic blocks are placed at the clamping ring and the bag opening, achieving a tight attraction between them. Due to the strong adsorption force of the magnetic blocks, when the clamping ring contacts the bag opening, the magnetic force firmly fixes the bag to the clamping ring, preventing the bag from loosening or misaligning due to external force during ejection. This design not only improves the stability of the connection between the bag and the clamping ring but also ensures that the bag accurately wraps around the filter screen during ejection, effectively preventing dust leakage. Furthermore, the magnetic connection simplifies the operation, eliminating the need for additional fixing devices and improving the safety and efficiency of the filter cartridge disassembly process.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. The filter cartridge is equipped with an ejector device and a bag cover. The elastic element of the ejector device is compressed during normal operation. When the clamping ring is released, the elastic element releases its stored elastic potential energy, automatically driving the clamping ring and bag cover to eject. During ejection, the bag covers the filter screen. This design replaces the traditional manual bag-covering operation with mechanical automation, effectively avoiding accidental contact caused by manual intervention, thus significantly reducing the risk of dust leakage and improving the safety of the disassembly process.

[0028] 2. The tight fit design between the clamping ring and the bag ensures that the inner diameter of the clamping ring is slightly larger than the outer diameter of the filter screen, and the bag opening is secured by a strong magnetic block or locking ring. This precise matching and fixing method effectively enhances the sealing performance, making it particularly suitable for handling hazardous particles. It effectively prevents the spread of combustible dust, thereby avoiding potential safety hazards. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a filter cartridge according to this application;

[0030] Figure 2 This is a diagram showing the stretched usage state of a filter cartridge bag according to this application;

[0031] Figure 3 This is a left view of a filter cartridge according to this application;

[0032] Figure 4 yes Figure 3 AA sectional view.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Filter screen; 2. Base plate; 3. Pop-out device; 4. Bag cover; 5. Restricting component; 21. Limiting groove; 31. Mounting plate; 32. Elastic component; 33. Clamping ring; 34. Receiving cavity; 41. Pull rope; 51. Limiting protrusion; 331. Gap; 332. Locking ring. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0036] This application discloses a filter cartridge, as shown in the embodiments below. Figure 1 and Figure 2 The filter cartridge consists of a cylindrical filter screen 1, a circular base plate 2 installed at the bottom of the filter screen 1, a pop-out device 3 installed at the bottom of the circular base plate 2, a sleeve 4 installed inside the pop-out device 3, and a limiting member 5. Figure 1 The image shows the bag 4 folded and installed inside the ejector device 3. Figure 2The pop-out device 3 pops out the bag 4, and the bag 4 is stretched, covering the filter screen 1 inside the bag 4.

[0037] Specifically, the base plate 2 is coaxially arranged with the filter screen 1, and the base plate 2 is installed on the inner wall of the bottom end of the filter screen 1. The pop-out device 3 is used to pop out the side of the base plate 2 away from the filter screen 1. The base plate 2 is provided with a limiting member 5 that restricts the pop-out device 3 from popping out the bag 4. When the limiting member 5 is released from the pop-out device 3, it can drive the bag 4 to pop out from bottom to top along the outer wall of the filter screen 1. Under the drive of the pop-out device 3, the bag 4 covers the filter screen 1 from bottom to top during the pop-out process, achieving the effect of preventing dust leakage. In this embodiment, the closed end of the bag 4 is located at the bottom of the filter screen 1 and covers the bottom of the filter screen 1. The opening of the bag 4 has a through cavity, and a pull rope 41 is installed in the through cavity. After the bag 4 covers the filter screen 1, the length of the pull rope 41 is adjusted to adjust the reduction of the opening of the bag 4, thereby sealing the filter screen 1 inside the bag 4 and preventing dust from falling and leaking. Refer to Figure 3 and Figure 4 The ejection device 3 includes a mounting plate 31 installed on the side of the base plate 2 away from the filter screen 1, a clamping ring 33 for clamping the opening of the bag 4, and an elastic element 32. The clamping ring 33 is coaxially disposed on the outer wall of the filter screen 1, and the mounting plate 31 and the base plate 2 form a receiving cavity 34 for accommodating the bag 4. The two ends of the elastic element 32 are respectively connected to the clamping ring 33 and the mounting plate 31. When the filter cartridge is in normal use, the elastic element 32 is in a compressed state, and the bag 4 is accommodated in the receiving cavity 34. At this time, the limiting member 5 presses against the clamping ring 33 to prevent the clamping ring 33 from being ejected by the elastic element 32. When the limiting member 5 releases the restriction on the clamping ring 33, the elastic element 32 returns to its original shape, and the elastic element 32 ejects the clamping ring 33 holding the opening of the bag 4 from bottom to top along the outer wall of the filter screen 1.

[0038] In this embodiment, the mounting plate 31 is a circular mounting plate, made of corrosion-resistant materials such as aluminum alloy or stainless steel, with a thickness of 3mm-5mm. The elastic element 32 is a spring, coaxially arranged with the filter screen 1, and its inner diameter is larger than the outer diameter of the filter screen 1 to prevent contact between the spring and the outer surface of the filter screen 1, thus preventing dust from falling off. The spring can be made of high-strength steel wire to ensure sufficient elastic restoring force. The mounting plate 31 can be connected to the base plate 2 by bolts or welding to ensure a secure and reliable connection. The spring and the clamping ring 33 are connected by a snap-fit ​​or hook. The spring diameter is larger than the inner diameter of the bottom end of the filter screen 1, ensuring that when the spring releases its elasticity, it drives the clamping ring 33 to wrap around the filter screen 1 vertically from bottom to top, preventing contact between the clamping ring 33 and the outer surface of the filter screen 1, thus avoiding dust leakage. Specifically, in this embodiment, the clamping ring 33 is an annular structure, and its material can be ceramic fiber or other high-strength materials to ensure the strength and wear resistance of the clamping ring 33. The inner diameter of the clamping ring 33 is larger than the outer diameter of the filter screen 1, and when the inner diameter of the clamping ring 33 is a and the outer diameter of the filter screen 1 is b, the range of ab is 5mm-10mm, to ensure that the clamping ring 33 can move smoothly on the outer side of the filter screen 1. Furthermore, since there is a 5mm-10mm gap 331 between the clamping ring 33 and the filter screen 1, it effectively prevents the clamping ring 33 from contacting the outer surface of the filter screen 1 during movement. Specifically, the limiting member 5 includes at least one limiting protrusion 51 rotatably disposed on the base plate 2. The outer side of the base plate 2 is provided with a limiting groove 21, and the number of limiting grooves 21 and limiting protrusions 51 are equal. The limiting protrusions 51 are rotatably mounted in the limiting grooves 21 for abutting against the clamping ring 33. The limiting protrusion 51 can be flipped vertically and installed in the limiting groove 21, or it can be flipped horizontally and installed in the limiting groove 21. In this embodiment, the limiting protrusion 51 is provided with a through hole, and a rotating shaft is provided in the limiting groove 21 in the vertical direction. The rotating shaft passes through the through hole so that the limiting protrusion 51 can be flipped horizontally around the shaft. The limiting groove 21 and the limiting protrusion 51 are matched in shape so that the limiting protrusion 51 can be accommodated in the limiting groove 21. When the filter cartridge is working normally, the limiting protrusion 51 is flipped out of the limiting groove 21 so that the limiting protrusion 51 is exposed on the outside of the bottom plate 2 and can abut against the clamping ring 33 below. In this embodiment, there are two limiting protrusions 51, and the two limiting protrusions 51 are symmetrically arranged on the side wall of the bottom plate 2. This is beneficial for the limiting protrusions 51 to evenly press the clamping ring 33, so that the clamping ring 33 can be in a horizontal state when the restriction on the clamping ring 33 is not released. When the restriction on the clamping ring 33 by the two limiting protrusions 51 is released at the same time, the clamping ring 33 can pop out stably, avoiding shaking during the wrapping process.Furthermore, the clamping ring 33 is provided with a gap 331 and a locking ring 332. The locking ring 332 is located at the discharge port of the gap 331. The opening of the bag 4 enters the gap 331 from the side of the clamping ring 33 closest to the filter screen 1 and exits from the upper end face of the clamping ring 33. Then, the locking ring 332 restricts the opening of the bag 4 on the upper end face of the clamping ring 33 to prevent the bag 4 from loosening. The locking ring 332 is arc-shaped and can be made of a flexible material to facilitate the insertion and fixation of the opening of the bag 4. In addition, the clamping ring 33 and the bag 4 can also be attracted by strong magnetic attraction to ensure stable clamping of the bag 4 by the clamping ring 33. Both the clamping ring 33 and the opening of the bag 4 are provided with strong magnetic blocks. The strong magnetic blocks tightly attract the clamping ring 33 and the opening of the bag 4, thereby further enhancing the clamping effect.

[0039] The implementation principle of this embodiment is as follows:

[0040] The base plate 2 is coaxially mounted with the filter screen 1 and installed on the inner wall of the bottom end of the filter screen 1. The ejector device 3 is installed on the side of the base plate 2 away from the filter screen 1 and is used to eject the sleeve 4. The ejector device 3 includes a mounting plate 31, a clamping ring 33, and an elastic element 32. The mounting plate 31 is connected to the base plate 2; the elastic element 32 is a spring made of high-strength steel wire, coaxially mounted with the filter screen 1, and its inner diameter is larger than the outer wall diameter of the filter screen 1 to prevent contact with the outer surface of the filter screen 1, which could cause dust to fall off. The two ends of the spring are connected to the clamping ring 33 and the mounting plate 31, respectively. The clamping ring 33 has a ring structure, with an inner wall diameter larger than the outer wall diameter of the filter screen 1, the difference being within the range of 5mm-10mm, ensuring that the clamping ring 33 can move smoothly on the outer wall of the filter screen 1 without contact.

[0041] The limiting component 5 includes two symmetrical and horizontally arranged limiting protrusions 51 on the side wall of the base plate 2. The outer side of the base plate 2 is provided with an equal number of limiting grooves 21. In this embodiment, the limiting protrusions 51 are provided with through holes, and a rotating shaft passes through the limiting grooves 21, so that the limiting protrusions 51 can rotate horizontally around the shaft, which is beneficial for evenly pressing the clamping ring 33. The closed end of the bag 4 is located at the bottom of the filter screen 1 and covers it. The opening is provided with a through cavity and a pull rope 41 is installed. After covering the filter screen 1, the length of the pull rope 41 is adjusted to reduce the opening and seal the filter screen 1 inside the bag 4. The clamping ring 33 is provided with a gap 331 and a locking ring 332. The locking ring 332 is located at the discharge port of the gap 331 and is made of arc-shaped flexible material, which facilitates the insertion and fixation of the bag 4 opening.

[0042] When the filter cartridge is in normal use, the elastic element 32 is in a compressed state, and the bag 4 is contained in the receiving cavity 34 surrounded by the mounting plate 31 and the base plate 2. The limiting element 5 presses against the clamping ring 33 to prevent it from popping out. When the filter cartridge needs to be replaced, press the two limiting protrusions 51 to retract them into the limiting groove 21. The spring drives the bag 4 to cover the filter screen 1 along the outer surface of the filter screen 1. Then, the filter screen 1 is sealed in the bag 4 by the pull rope 41 to prevent dust from falling off the filter cartridge during disassembly and transportation, and to prevent the explosion hazard caused by static electricity generated by the human body and the leaked dust.

[0043] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A filter cartridge, characterized by, The device includes a cylindrical filter screen (1), a base plate (2), a pop-out device (3), a sleeve (4), and a limiting member (5). The base plate (2) is coaxially connected to the inner wall of the bottom end of the filter screen (1). The pop-out device (3) is installed on the side of the base plate (2) away from the filter screen (1). The base plate (2) is provided with the limiting member (5) that restricts the pop-out device (3) from popping out the sleeve (4). The pop-out device (3) is equipped with the sleeve (4). The pop-out device (3) is configured such that when the limiting member (5) is released from the pop-out device (3), it can drive the sleeve (4) to pop out from bottom to top along the outer wall of the filter screen (1). The sleeve (4) cooperates with the pop-out device (3) to form a covering state during the pop-out process, thereby wrapping the filter screen (1).

2. A filter cartridge according to claim 1 wherein, The ejection device (3) includes a mounting plate (31), a clamping ring (33), and an elastic element (32). The mounting plate (31) is mounted on the side of the base plate (2) away from the filter screen (1) and surrounds the base plate (2) to form a receiving cavity (34) for accommodating the bag (4). The clamping ring (33) is used to clamp the opening of the bag (4). The clamping ring (33) is coaxially disposed on the outer wall of the filter screen (1). The two ends of the elastic element (32) are respectively connected to the clamping ring (33) and the mounting plate (31). When the filter cylinder is in normal use, the limiting member (5) presses against the clamping ring (33), the elastic element (32) is in a compressed state, and the bag (4) is accommodated in the receiving cavity (34). When the limiting member (5) is released from the clamping ring (33), the clamping ring (33) clamps the bag (4) and ejects it from bottom to top along the outer wall of the filter screen (1).

3. A filter cartridge according to claim 2, characterized in that, The elastic element (32) is a spring, which is coaxially arranged with the filter screen (1), and the inner diameter of the spring is larger than the outer wall diameter of the filter screen (1).

4. A filter cartridge according to claim 2, characterized in that, The inner diameter of the clamping ring (33) is larger than the outer diameter of the filter screen (1).

5. A filter cartridge according to claim 4, characterized in that, The inner wall of the clamping ring (33) is a, and the outer wall diameter of the filter screen (1) is b, with a range of 5mm-10mm.

6. A filter cartridge according to claim 2, characterized in that, The limiting member (5) includes at least one limiting protrusion (51). The outer side of the base plate (2) is provided with a limiting groove (21) corresponding to the limiting protrusion (51). Each limiting protrusion (51) is rotatably mounted in the limiting groove (21) to abut against the clamping ring (33). When the limiting protrusion (51) is flipped over and accommodated in the limiting groove (21), the clamping ring (33) pops out from bottom to top.

7. A filter cartridge according to claim 6, characterized in that, The number of the limiting protrusions (51) is two, and the two limiting protrusions (51) are symmetrical and horizontally arranged.

8. A filter cartridge according to claim 1, characterized in that, The bag (4) has an opening ring with a cavity through which a pull rope (41) with an adjustable opening size is threaded.

9. A filter cartridge according to claim 2, characterized in that, The clamping ring (33) is provided with a gap (331) and a locking ring (332). The locking ring (332) is located at the discharge port of the gap (331). The opening of the bag (4) passes through the gap (331) until the locking ring (332) locks the opening of the bag (4).

10. A filter cartridge according to claim 2, characterized in that, Both the clamping ring (33) and the opening of the bag (4) are provided with strong magnetic blocks, which tightly attract the clamping ring (33) and the opening of the bag (4) through the strong magnetic blocks.

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