Filter element structure and air purification device

Abstract

The application relates to a filter core structure and an air purification device, which comprise a first end cover and a second end cover longitudinally distributed, a filter layer in the form of a ring is arranged between the first end cover and the second end cover, characterized in that a blocking sleeve is further arranged between the first end cover and the second end cover, the blocking sleeve is a flexible structure capable of being folded and has a fixed end and a movable end. The adjustable blocking sleeve is integrated on the filter core structure, so that before the filter core structure is taken out, the blocking sleeve can form a ring structure covering the periphery of the filter layer, so that the substances attached to the outer surface of the filter layer are not easy to fall into the surrounding environment; the blocking sleeve can also be adjusted to expose the filter layer, so that the filter layer can perform filtering operation.

Description

Technical Field

[0001] This invention relates to the field of air purification technology, specifically to a filter structure and an air purification device. Background Technology

[0002] Dust mites and pollen are common allergens that can trigger asthma, allergic rhinitis, and other illnesses. Dust mites and their excrement are particularly common in bedrooms, impacting residents' health. Therefore, many households install air purifiers to improve air quality and reduce the effects of allergens. Air purifiers primarily use a built-in suction motor to draw outside air into the unit, where a filter adheres to it. Pollen, mites, and dust particles carried in by the air are then adsorbed onto the filter's outer surface. The filtered air is then expelled into the room, thus purifying the indoor air and improving the living environment.

[0003] As the air purifier is used over time, substances accumulate on the filter, weakening its filtration performance. At this point, the filter needs to be disassembled, cleaned, or replaced. Most air purifiers currently require the following method for filter removal: open the cover on one side of the casing to expose the filter, then pull the filter horizontally out of the casing to remove it.

[0004] However, because the outer surface of the filter element is covered with a large number of mite carcasses, pollen, or dust, the material on the filter element is easily shaken off during the removal process due to factors such as shaking or collision with the casing, causing pollution to the surrounding environment. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a filter element structure and an air purification device to solve the problem that in the prior art, the filter element is easily shaken off due to factors such as shaking or collision with the housing during the removal process, causing pollution to the surrounding environment.

[0006] This invention is achieved through the following technical solution: A filter element structure includes a longitudinally distributed first end cap and a second end cap, with an annular filter layer disposed between the first and second end caps. A barrier sleeve is also disposed between the first and second end caps. The barrier sleeve is a foldable flexible structure with a fixed end and a movable end. The fixed end is connected to the first end cap. When the movable end is displaced in a direction close to the fixed end, the barrier sleeve is compressed by the movable end and enters a contracted state, exposing the outer periphery of the filter layer. When the movable end is displaced in a direction away from the fixed end, the barrier sleeve is pulled by the movable end and enters an extended state, forming an annular structure that wraps around the outer periphery of the filter layer.

[0007] Furthermore, the barrier sleeve includes a longitudinally distributed fixed ring, a movable ring, and an annular spacer. The upper and lower ends of the spacer are respectively connected to the opposite sides of the fixed ring and the movable ring. The movable ring can move relative to the fixed ring along the axial direction of the filter layer.

[0008] Furthermore, the fixed ring is connected to the first end cap, and the bottom surface of the first end cap is provided with a first ring body located on the movement trajectory of the movable ring, and the outer diameter of the movable ring is smaller than the inner diameter of the first ring body; The first ring body has two mirror-distributed first mounting cavities, each containing a first slider. The outer circular surface of the first ring body has a first through hole for the end of the first slider to slide out, and the inner circular surface of the first ring body has a second through hole communicating with the first mounting cavity. The second through hole contains a first locking block connected to the first slider. The outer circular surface of the movable ring has a locking groove. When the movable ring moves into the first ring body, the first locking block can be inserted into the locking groove by horizontal movement to fix the movable ring.

[0009] Furthermore, the second end cap is provided with a second ring body located on the movement trajectory of the movable ring, and the outer diameter of the movable ring is smaller than the inner diameter of the second ring body; The second ring body is provided with a second mounting cavity, and a second slider is provided in the second mounting cavity. The outer circular surface of the second ring body is provided with a third through hole for the end of the second slider to slide out. The inner circular surface of the second ring body is provided with a fourth through hole communicating with the second mounting cavity. A second locking block connected to the second slider is provided in the fourth through hole. When the movable ring moves into the second ring body, the second locking block can be inserted into the locking groove by horizontal movement to fix the movable ring.

[0010] Furthermore, the top surface of the movable ring is provided with a through hole that penetrates its bottom surface, and the through hole extends along the axial direction of the movable ring; A guide rod is provided between the first end cap and the second end cap. The two ends of the guide rod are respectively connected to the opposite sides of the first end cap and the second end cap. The guide rod extends along the axial direction of the movable ring and passes through the through hole.

[0011] Furthermore, the first end cap is provided with a telescopic rod that can extend and retract along the distance between the first end cap and the second end cap. The telescopic rod is located on the side of the movable ring facing the first end cap. One end of the telescopic rod is connected to the side of the first end cap facing the movable ring, and the other end is connected to the side of the movable ring facing the first end cap.

[0012] Furthermore, the telescopic rod includes a first sleeve rod, a second sleeve rod, a plurality of third sleeve rods located between the first sleeve rod and the second sleeve rod, and a first support spring. The first sleeve rod, the plurality of third sleeve rods, and the second sleeve rod are sequentially sleeved to form a telescopic sleeve structure. The first sleeve rod and the second sleeve rod are respectively connected to the side opposite to the first end cap and the movable ring. The first support spring is located inside the first sleeve rod, the second sleeve rod, and the third sleeve rod, and the two ends of the first support spring abut against the first sleeve rod and the second sleeve rod, respectively.

[0013] An air purification device using a filter element structure includes a housing. The housing has a cavity for installing the filter element structure. A loading / unloading port communicating with the cavity is provided on one side of the housing. The top and bottom surfaces of the cavity are provided with sliding grooves for sliding a first end cap and a second end cap. The width of the sliding groove is equal to the diameter of the first and second end caps. The distance between the two first perforations on the first ring body is equal to the width of the sliding groove. One end of the sliding groove passes through the loading / unloading port.

[0014] Furthermore, a second support spring is provided inside the first mounting cavity. The second support spring can extend and retract radially along the movable ring. The two ends of the second support spring are respectively connected to the first slider and the inner wall of the first mounting cavity. The second support spring is used to push the first slider in a direction away from the axis of the movable ring. When the two first sliders are pushed by the two second support springs in a direction away from the axis of the movable ring, the width of the groove is less than the distance between the two first sliders on opposite sides.

[0015] Furthermore, the receiving cavity is provided with two adjusting grooves located on both sides of the slide groove, the extending direction of the adjusting groove is consistent with the extending direction of the slide groove, and the adjusting groove is connected to the slide groove; When the two first sliders are pushed by the two second support springs in a direction away from the axis of the movable ring, the distance between the two first sliders on opposite sides is not greater than the distance between the two adjustment grooves on opposite sides.

[0016] The beneficial effects of this invention are as follows: This filter element structure and air purification device integrates an adjustable barrier sleeve into the filter element structure. Before the filter element structure is removed, the barrier sleeve forms a ring structure covering the outer periphery of the filter layer, making it difficult for substances attached to the outer surface of the filter layer (such as mites and pollen) to fall into the surrounding environment. The barrier sleeve can also be adjusted to expose the filter layer so that it can perform filtration.

[0017] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the diaphragm of the present invention when it is partially unfolded; Figure 2 This is a schematic diagram of the structure of the partition of the present invention when it is fully deployed; Figure 3 This is a schematic diagram of the structure when the filter layer of the present invention is exposed; Figure 4 This is a schematic diagram of the structure of the movable ring and the first ring body of the present invention when they are not fixed. Figure 5 This is a schematic diagram of the structure of fixing the movable ring and the first ring body according to the present invention; Figure 6 This is a schematic diagram of the structure of the guide rod and the movable ring of the present invention. Figure 7 This is a schematic diagram of the structure of the telescopic rod and the movable ring of the present invention; Figure 8 This is a three-dimensional structural diagram of the filter element structure of the present invention when it is installed in the receiving cavity; Figure 9 This is a schematic diagram of the casing of the present invention; Figure 10 This is a schematic diagram of the filter element structure of the present invention installed in the receiving cavity; Figure 11 This is a schematic diagram of the structure of the first slider and the adjusting groove of the present invention. Figure 12 This is an application model diagram of the air purification device of the present invention.

[0019] In the picture: 1. First end cap; 2. Second end cap; 3. Filter layer; 4. Movable ring; 401. Partition; 5. First ring body; 501. First mounting cavity; 502. First slider; 503. First through hole; 504. Second through hole; 505. First locking block; 6. Locking groove; 7. Second ring body; 701. Second slider; 702. Third through hole; 703. Fourth through hole; 8. Guide rod; 9. Telescopic rod; 10. Housing; 1001. Receiving cavity; 1002. Loading and unloading port; 11. Slide groove; 12. Second support spring; 13. Adjustment groove. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the above description of the present invention, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0025] This invention provides a technical solution: Please refer to the figure. Figure 1-5Example 1: A filter element structure includes a first end cap 1 and a second end cap 2 arranged longitudinally. An annular filter layer 3 is disposed between the first end cap 1 and the second end cap 2. A barrier sleeve is also disposed between the first end cap 1 and the second end cap 2. The barrier sleeve is a foldable flexible structure with a fixed end and a movable end. The fixed end is connected to the first end cap 1. When the movable end is displaced in a direction close to the fixed end, the barrier sleeve is compressed by the movable end and is in a contracted state, and the outer periphery of the filter layer 3 is exposed. When the movable end is displaced in a direction away from the fixed end, the barrier sleeve is pulled by the movable end and is in an extended state, and the barrier sleeve forms an annular structure that wraps around the outer periphery of the filter layer 3.

[0026] The barrier sleeve includes a fixed ring, a movable ring 4 and an annular spacer 401 distributed longitudinally. The fixed ring and the movable ring 4 correspond to the fixed end and the movable end, respectively. The upper and lower ends of the spacer 401 are connected to the opposite sides of the fixed ring and the movable ring 4, respectively. The movable ring 4 can move relative to the fixed ring along the axial direction of the filter layer 3.

[0027] The fixed ring is connected to the first end cap 1. The bottom surface of the first end cap 1 is provided with a first ring body 5 located on the movement trajectory of the movable ring 4. The outer diameter of the movable ring 4 is smaller than the inner diameter of the first ring body 5. The first ring body 5 has two mirror-distributed first mounting cavities 501, and a first slider 502 is provided in the first mounting cavity 501. The outer circular surface of the first ring body 5 has a first through hole 503 for the end of the first slider 502 to slide out. The inner circular surface of the first ring body 5 has a second through hole 504 communicating with the first mounting cavity 501. The second through hole 504 has a first locking block 505 connected to the first slider 502. The outer circular surface of the movable ring 4 has a locking groove 6. When the movable ring 4 moves into the first ring body 5, the first locking block 505 can be inserted into the locking groove 6 by horizontal movement to fix the movable ring 4.

[0028] In this design, the partition 401 has a corrugated structure (like a corrugated tube), which can be contracted by folding or stretched out. The fixed ring and the movable ring 4 serve as the carriers of the partition 401. The two ends of the partition 401 can be connected to the fixed ring and the movable ring 4 respectively by gluing. The fixed ring can be fixed by integral molding with the first end cap 1, welding, or gluing.

[0029] In actual use, the operator holds the movable ring 4 and pushes and pulls the movable ring 4 along the axial direction of the filter layer 3, so that the movable ring 4 moves relative to the fixed ring. The partition 401 is in the following two states: Contraction state: The movable ring 4 moves towards the direction of the fixed ring. Due to the reduced distance between the movable ring 4 and the fixed ring, the partition 401 contracts. In this state, the partition 401 does not cover the outer periphery of the filter layer 3, and the filter layer 3 can be used normally for air purification. Extended state: The movable ring 4 moves away from the fixed ring, and the increased distance between the movable ring 4 and the fixed ring causes the partition 401 to unfold. In this state, the partition 401 forms an annular structure covering the outer periphery of the filter layer 3. At this time, the partition 401 covers the outer periphery of the filter layer 3, blocking air from entering the filter layer 3 and preventing the filter element structure from performing air filtration. However, if shaking occurs and the material on the outer surface of the filter layer 3 falls off, the partition 401 can block the falling material, making it less likely to pollute the surrounding air.

[0030] Preferred, the first end cap 1 and the second end cap 2 are positioned opposite each other, and the movable ring 4 can hang down naturally under the action of gravity, so that the partition 401 is in an extended state.

[0031] Secondly, when the movable ring 4 is in the retracted state, it is placed into the first ring body 5. Since the outer diameter of the movable ring 4 is designed to be smaller than the inner diameter of the first ring body 5, when the movable ring 4 is placed into the first ring body 5, the outer circular surface of the movable ring 4 is nested on the inner circular surface of the first ring body 5. At this time, when the slot 6 on the movable ring 4 is aligned with the second through hole 504 of the first ring body 5, the first locking block 505 can move horizontally in the direction of the axis of the first ring body 5 until it extends out of the second through hole 504 and is inserted into the slot 6. At this time, the two ends of the first locking block 505 are located in the slot 6 and the second through hole 504 respectively, thereby fixing the movable ring 4 in the first ring body 5, so that the movable ring 4 is kept in the retracted state, so that the filter layer 3 can filter the air. Conversely, the first locking block 505 can also be moved horizontally in a direction away from the axis of the first ring body 5, so that the first locking block 505 retracts into the second through hole 504 and one end of it is disengaged from the slot 6. At this time, the movable ring 4 is in a free state and can move in a direction away from the fixed ring.

[0032] In actual use, before installing the filter structure into the air purifier, the user fixes the movable ring 4 in the first ring body 5, and then installs the filter structure for use; when it is necessary to remove the filter structure, the user first releases the fixation of the movable ring 4, and then moves it to unfold the partition 401 to cover the outside of the filter layer 3, and then pulls the filter structure horizontally to pull it out of the air purifier to achieve the purpose of disassembly.

[0033] Compared to the filter cartridge structure in the prior art, the present invention integrates an adjustable barrier sleeve into the filter cartridge structure. Before the filter cartridge structure is removed, the barrier sleeve can form a ring structure covering the outer periphery of the filter layer 3, making it difficult for substances (such as mites and pollen) attached to the outer surface of the filter layer 3 to fall into the surrounding environment. The barrier sleeve can also be adjusted to expose the filter layer 3 so that it can perform filtration.

[0034] Please see Figure 8-12 An air purification device employing a filter element structure includes a housing 10. The housing 10 contains a receiving cavity 1001 for installing the filter element structure. A loading / unloading port 1002 communicating with the receiving cavity 1001 is provided on one side of the housing 10. The top and bottom surfaces of the receiving cavity 1001 are both provided with sliding grooves 11 for sliding a first end cap 1 and a second end cap 2. The width of the sliding groove 11 is equal to the diameter of the first end cap 1 and the second end cap 2. The distance between the two first through holes 503 on the first ring body 5 is equal to the width of the sliding groove 11. One end of the sliding groove 11 passes through the loading / unloading port 1002. A cover plate is detachably connected to the loading / unloading port 1002.

[0035] The diameter of the first ring body 5 is equal to the diameter of the first end cap 1, and the first ring body 5 and the first end cap 1 can simultaneously contact the side wall of the slide groove 11.

[0036] In this solution, by opening grooves 11 on the top and bottom surfaces of the receiving cavity 1001 to fit the first end cap 1 and the second end cap 2 respectively, a loading and unloading channel is provided for the loading and unloading of the filter element structure. The horizontal sliding of the filter element structure during loading and unloading is guided and limited by the grooves 11, so that the filter element structure can only slide into or out of the receiving cavity 1001 along the extension direction of the grooves 11.

[0037] During the insertion process, the two first locking blocks 505 are pushed towards the axis of the first ring body 5, thereby fixing the movable ring 4 onto the first ring body 5. Then, the filter element structure is pushed into the receiving cavity 1001 through the slide groove 11. During this process, the sides of the two first locking blocks 505 away from the axis of the first ring body 5 contact the two sides of the slide groove 11 respectively. Therefore, both first locking blocks 505 are physically blocked by the slide groove 11 and cannot slide away from the axis of the first ring body 5. This makes it difficult for the two first locking blocks 505 to disengage from the locking groove 6, thus maintaining the fixed state of the movable ring 4.

[0038] When removing the filter element, by pulling the filter element structure, the two first locking blocks 505 are released from contact with the two side walls of the slide groove 11, and the two first locking blocks 505 can move away from the axis of the first ring body 5, thereby releasing the fixation of the movable ring 4.

[0039] In this invention, only the housing 10 and the filter structure are improved. Air purifiers are already a mature technology, and this invention does not improve other structures such as the fan blade structure. How to draw ambient air into the housing 10 and filter the air through the filter structure are common knowledge and do not interfere with the improvement points of this invention. Therefore, this invention does not describe other structures such as the fan blade structure.

[0040] In this embodiment, a second support spring 12 is provided in the first mounting cavity 501. The second support spring 12 can extend and retract radially along the movable ring 4. The two ends of the second support spring 12 are respectively connected to the first slider 502 and the inner wall of the first mounting cavity 501. The second support spring 12 is used to push the first slider 502 in a direction away from the axis of the movable ring 4. When the two first sliders 502 are pushed by the two second support springs 12 in a direction away from the axis of the movable ring 4, the width of the groove 11 is less than the distance between the two first sliders 502 on opposite sides.

[0041] In this scheme, the second support spring 12, in its natural state, applies a thrust to the first slider 502, moving it away from the axis of the first ring body 5, so that one end of the first slider 502 remains protruding outside the first through hole 503 in its natural state. By squeezing this end, the first slider 502 can overcome the elastic force of the second support spring 12 and move towards the axis of the first ring body 5.

[0042] In practical use, the movable ring 4 is placed into the first ring body 5 and the first slider 502 is squeezed. Then, the filter element structure is pushed horizontally into the receiving cavity 1001, so that the two first sliders 502 are squeezed by the side walls of the slide groove 11. The first locking block 505 connected to the first slider 502 is squeezed into the first locking groove 6. Under the support of the second support spring 12, the first slider 502 is in close contact with the side wall of the slide groove 11.

[0043] During the disassembly of the filter element structure, by pulling the filter element structure, the first slider 502 is released from the constraint of the slide groove 11. Under the elastic force of the second support spring 12, the first slider 502 moves away from the axis of the first ring body 5, thereby driving the first locking block 505 to disengage from the locking groove 6, and then automatically releasing the fixation of the movable ring 4, thus coordinating the disassembly of the filter element structure with the movable ring 4 covering the filter layer 3.

[0044] In this embodiment, the receiving cavity 1001 is provided with two adjusting grooves 13 located on both sides of the slide groove 11. The extending direction of the adjusting groove 13 is consistent with the extending direction of the slide groove 11, and the adjusting groove 13 is connected to the slide groove 11. When the two first sliders 502 are pushed by the two second support springs 12 in a direction away from the axis of the movable ring 4, the distance between the two first sliders 502 on opposite sides is not greater than the distance between the two adjustment grooves 13 on opposite sides.

[0045] In this design, the adjusting groove 13 and the sliding groove 11 are connected to form a loading and unloading channel for the filter element structure. The connection between the two adjusting grooves 13 and the sliding groove 11 effectively increases the width of part of the sliding groove 11. This area allows the two first sliders 502 to be pushed out by the second elastic support, thereby disengaging the first locking block 505 connected to the first slider 502 from the locking groove 6.

[0046] In practical use, during the disassembly of the filter element structure, as the filter element structure is pulled, when the first slider 502 is located in the area where the adjustment groove 13 and the slide groove 11 are connected, due to the increase in width, the first slider 502 can be pushed out by the second elastic support, and the first locking block 505 disengages from the locking groove 6, thereby releasing the fixation of the movable ring 4.

[0047] Example 2: The second end cap 2 is provided with a second ring body 7 located on the movement trajectory of the movable ring 4, and the outer diameter of the movable ring 4 is smaller than the inner diameter of the second ring body 7; The second ring body 7 has a second mounting cavity (the structure is the same as the first mounting cavity 501, but not shown in the figure). The second mounting cavity has a second slider (the structure is the same as the first slider 502, but not shown in the figure). The outer circular surface of the second ring body 7 has a third through hole (the structure is the same as the first through hole 503, but not shown in the figure) for the end of the second slider to slide out. The inner circular surface of the second ring body 7 has a fourth through hole that communicates with the second mounting cavity. The fourth through hole has a second locking block that connects to the second slider. When the movable ring 4 moves into the second ring body 7, the second locking block can be inserted into the locking groove 6 by horizontal movement to fix the movable ring 4.

[0048] In this design, the second ring 7 is installed on the second end cap 2, and the first ring 5 is installed on the first end cap 1, thereby providing two fixed positions for the movable ring 4. The first ring 5 fixes the movable ring 4 in its contracted state (the filter layer 3 can perform filtration), while the second ring 7 fixes the movable ring 4 in its extended state (it covers the filter layer 3 after unfolding).

[0049] If the user needs to unfold the barrier sleeve, he can pull the movable ring 4 to move it axially away from the fixed ring until the movable ring 4 enters the second ring body 7 and aligns the slot 6 on the movable ring 4 with the second locking block on the second ring body 7 in the radial position. At this time, the second locking block can be horizontally moved and inserted into the slot 6 to lock the movable ring 4 on one side of the second end cover 2. This ensures that after the filter element structure is removed, the separator 401 can cover the outer periphery of the filter layer 3.

[0050] Please see Figure 6 Example 3: The top surface of the movable ring 4 is provided with a through hole that penetrates its bottom surface, and the through hole extends along the axial direction of the movable ring 4; A guide rod 8 is provided between the first end cap 1 and the second end cap 2. The two ends of the guide rod 8 are respectively connected to the opposite sides of the first end cap 1 and the second end cap 2. The guide rod 8 extends along the axial direction of the movable ring 4 and passes through the through hole.

[0051] In this design, the guide rod 8 passes through the through hole, allowing the movable ring 4 to cooperate with the guide rod 8 to form a sliding pair. Therefore, the movable ring 4 can only slide along the axial direction of the guide rod 8. The guide rod 8 limits the movable ring 4, improving the sliding stability of the movable ring 4.

[0052] In practical use, when the operator manually drives the movable ring 4 to move axially, the inner wall of the through hole of the movable ring 4 forms a sliding fit with the outer circular surface of the guide rod 8. The guide rod 8 applies a radial constraint force to the movable ring 4, making it difficult for the movable ring 4 to undergo radial displacement or wobble during movement.

[0053] Meanwhile, since the guide rod 8 and the movable ring 4 are not coaxial, the movable ring 4 cannot rotate. Therefore, when the movable ring 4 moves into the first ring body 5 or the second ring body 7, it can ensure that the slot 6 on the movable ring 4 is horizontally aligned with the first locking block 505 or the second locking block.

[0054] Please see Figure 7 The difference between Embodiment 4 and Embodiment 3 is that: the first end cover 1 is provided with a telescopic rod 9 that can extend and retract along the distance between the first end cover 1 and the second end cover 2. The telescopic rod 9 is located on the side of the movable ring 4 facing the first end cover 1. One end of the telescopic rod 9 is connected to the side of the first end cover 1 facing the movable ring 4, and the other end is connected to the side of the movable ring 4 facing the first end cover 1.

[0055] In this design, when the operator manually moves the movable ring 4 axially, the telescopic rod 9 shortens or extends as the movable ring 4 moves. Specifically, when the movable ring 4 moves away from the fixed ring, the telescopic rod 9 extends as the movable ring 4 moves; when the movable ring 4 moves toward the fixed ring, the telescopic rod 9 shortens as the movable ring 4 moves. At this time, the telescopic rod 9 is in a folded and retracted state and does not cover the filter layer 3.

[0056] The extension or retraction of the telescopic rod 9 guides the movable ring 4 and applies a radial constraint force to the movable ring 4, making it difficult for the movable ring 4 to move radially or wobble, and preventing the movable ring 4 from rotating. Therefore, when the movable ring 4 moves into the first ring body 5 or the second ring body 7, it can ensure that the slot 6 on the movable ring 4 is horizontally aligned with the first locking block 505 or the second locking block.

[0057] Please see Figure 7 Example 5 differs from Example 4 in that: in this example, the telescopic rod 9 includes a first sleeve rod, a second sleeve rod, a plurality of third sleeve rods located between the first sleeve rod and the second sleeve rod, and a first support spring (not shown in the figure). The first sleeve rod, the plurality of third sleeve rods, and the second sleeve rod are sequentially sleeved to form a telescopic sleeve structure. The first sleeve rod and the second sleeve rod are respectively connected to the opposite side of the first end cap 1 and the movable ring 4. The first support spring is located inside the first sleeve rod, the second sleeve rod, and the third sleeve rod, and the two ends of the first support spring abut against the first sleeve rod and the second sleeve rod, respectively.

[0058] In this design, a first sleeve rod, multiple third sleeve rods, and a second sleeve rod are sequentially connected to form a retractable sleeve structure. The first sleeve rod has the largest diameter (located on the outermost layer) and is connected to the first end cap 1; the second sleeve rod has the smallest diameter (located on the innermost layer) and is connected to the movable ring 4; the diameters of the multiple third sleeve rods decrease progressively in the direction away from the first sleeve rod, and the multiple third sleeve rods are sequentially sleeved between the first and second sleeve rods. The two third sleeve rods at the ends respectively engage with the first and second sleeve rods.

[0059] In this configuration, the ends of the first and second sleeve rods that are relatively far apart are both sealed ends. The two ends of the first support spring abut against the ends of the first and second sleeve rods, respectively. Under the action of the elastic force, a relatively far thrust is applied to the first and second sleeve rods, thereby causing the first sleeve rod, multiple third sleeve rods, and the second sleeve rod to be in an extended state in their natural state.

[0060] In practical use, when the filter element structure is required, the movable ring 4 moves towards the first ring body 5. During this process, the movable ring 4 presses against the second sleeve rod, causing it to overcome the elastic force of the first support spring and move towards the first sleeve rod. As the movable ring 4 moves, the second and third sleeve rods are layered on top of each other until the movable ring 4 moves into the first ring body 5. At this point, the first sleeve rod, multiple third sleeve rods, and the second sleeve rod are sequentially fitted from the outside to the inside. In this state, the movable ring 4 can be fixed in the first ring body 5 by the insertion and engagement of the first locking block 505 with the locking groove 6.

[0061] When the filter element structure needs to be disassembled, after the first locking block 505 disengages from the slot 6, the first support spring releases its elastic force, pushing the movable ring 4 away from the fixed ring. This causes the movable ring 4 to move the partition 401, which then covers the filter layer 3. In this embodiment, under the action of the first support spring, the positions of the first end cap 1 and the second end cap 2 can be reversed, i.e., the second end cap 2 is on top and the first end cap 1 is on the bottom. The elastic force of the first support spring can overcome gravity and push the movable ring 4 upward.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A filter element structure, comprising a first end cap (1) and a second end cap (2) arranged longitudinally, wherein an annular filter layer (3) is disposed between the first end cap (1) and the second end cap (2), characterized in that: A barrier sleeve is also provided between the first end cap (1) and the second end cap (2). The barrier sleeve is a foldable flexible structure with a fixed end and a movable end. The fixed end is connected to the first end cap (1). When the movable end moves toward the fixed end, the barrier sleeve is squeezed by the movable end and is in a contracted state, and the outer periphery of the filter layer (3) is exposed. When the movable end is displaced away from the fixed end, the barrier sleeve is pulled by the movable end and is in an extended state, and the barrier sleeve forms an annular structure that wraps around the outer periphery of the filter layer (3).

2. The filter element structure according to claim 1, characterized in that: The barrier sleeve includes a fixed ring, a movable ring (4) and an annular partition (401) distributed longitudinally. The upper and lower ends of the partition (401) are connected to the opposite sides of the fixed ring and the movable ring (4), respectively. The movable ring (4) can move relative to the fixed ring along the axial direction of the filter layer (3).

3. The filter element structure according to claim 2, characterized in that: The fixed ring is connected to the first end cap (1), and the bottom surface of the first end cap (1) is provided with a first ring body (5) located on the movement trajectory of the movable ring (4). The outer diameter of the movable ring (4) is smaller than the inner diameter of the first ring body (5). The first ring body (5) is provided with two mirror-distributed first mounting cavities (501), and a first slider (502) is provided in the first mounting cavity (501). The outer circular surface of the first ring body (5) is provided with a first through hole (503) for the end of the first slider (502) to slide out. The inner circular surface of the first ring body (5) is provided with a second through hole (504) communicating with the first mounting cavity (501). The second through hole (504) is provided with a first locking block (505) connected to the first slider (502). The outer circular surface of the movable ring (4) is provided with a locking groove (6). When the movable ring (4) moves into the first ring body (5), the first locking block (505) can be inserted into the locking groove (6) by horizontal movement to fix the movable ring (4).

4. The filter element structure according to claim 2, characterized in that: The second end cap (2) is provided with a second ring body (7) located on the movement trajectory of the movable ring (4), wherein the outer diameter of the movable ring (4) is smaller than the inner diameter of the second ring body (7); The second ring body (7) is provided with a second mounting cavity, and a second slider (701) is provided in the second mounting cavity. The outer circular surface of the second ring body (7) is provided with a third through hole (702) for the end of the second slider (701) to slide out. The inner circular surface of the second ring body (7) is provided with a fourth through hole (703) communicating with the second mounting cavity. A second locking block connected to the second slider (701) is provided in the fourth through hole (703). When the movable ring (4) moves into the second ring body (7), the second locking block can be inserted into the locking groove (6) by horizontal movement to fix the movable ring (4).

5. The filter element structure according to claim 2, characterized in that: The top surface of the movable ring (4) is provided with a through hole that penetrates its bottom surface, and the through hole extends along the axial direction of the movable ring (4). A guide rod (8) is provided between the first end cap (1) and the second end cap (2). The two ends of the guide rod (8) are respectively connected to the opposite side of the first end cap (1) and the second end cap (2). The guide rod (8) extends along the axial direction of the movable ring (4) and passes through the through hole.

6. The filter element structure according to claim 2, characterized in that: The first end cap (1) is provided with a telescopic rod (9) that can extend and retract along the distance between the first end cap (1) and the second end cap (2). The telescopic rod (9) is located on the side of the movable ring (4) facing the first end cap (1). One end of the telescopic rod (9) is connected to the side of the first end cap (1) facing the movable ring (4), and the other end is connected to the side of the movable ring (4) facing the first end cap (1).

7. The filter element structure according to claim 6, characterized in that: The telescopic rod (9) includes a first sleeve rod, a second sleeve rod, a plurality of third sleeve rods located between the first sleeve rod and the second sleeve rod, and a first support spring. The first sleeve rod, the plurality of third sleeve rods, and the second sleeve rod are sequentially sleeved to form a telescopic sleeve structure. The first sleeve rod and the second sleeve rod are respectively connected to the side opposite to the first end cap (1) and the movable ring (4). The first support spring is located inside the first sleeve rod, the second sleeve rod, and the third sleeve rod, and the two ends of the first support spring abut against the first sleeve rod and the second sleeve rod, respectively.

8. An air purification device using the filter structure as described in claim 3, comprising a housing (10), wherein the housing (10) has a receiving cavity (1001) for installing the filter structure, and a loading / unloading port (1002) communicating with the receiving cavity (1001) is provided on one side of the housing (10), characterized in that: The top and bottom surfaces of the receiving cavity (1001) are provided with sliding grooves (11) for sliding the first end cap (1) and the second end cap (2). The width of the sliding groove (11) is equal to the diameter of the first end cap (1) and the second end cap (2). The distance between the two first through holes (503) on the first ring body (5) is equal to the width of the sliding groove (11). One end of the sliding groove (11) passes through the loading and unloading port (1002).

9. The air purification device according to claim 8, characterized in that: A second support spring (12) is provided in the first mounting cavity (501). The second support spring (12) can extend and retract radially along the movable ring (4). The two ends of the second support spring (12) are respectively connected to the first slider (502) and the inner wall of the first mounting cavity (501). The second support spring (12) is used to push the first slider (502) in a direction away from the axis of the movable ring (4). When the two first sliders (502) are pushed by the two second support springs (12) in a direction away from the axis of the movable ring (4), the width of the groove (11) is less than the distance between the two first sliders (502) on opposite sides.

10. The air purification device according to claim 9, characterized in that: The receiving cavity (1001) is provided with two adjusting grooves (13) located on both sides of the slide groove (11). The extending direction of the adjusting groove (13) is consistent with the extending direction of the slide groove (11), and the adjusting groove (13) is connected to the slide groove (11). When the two first sliders (502) are pushed by the two second support springs (12) in a direction away from the axis of the movable ring (4), the distance between the two first sliders (502) on the opposite side is not greater than the distance between the two adjustment grooves (13) on opposite sides.

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