An external filter device for air conditioner pipeline

Abstract

The utility model relates to air conditioner filter device especially relates to a kind of external filter device for air conditioner pipeline, the utility model provides a kind of external filter device for air conditioner pipeline, including the first pipe body and second pipe body that are interconnected, first clamping groove is opened in the first pipe body, the second pipe body is opened with second clamping groove in the position corresponding the first clamping groove, filter device is clamped and arranged in the first clamping groove and the second clamping groove, at least one locking device is arranged adjacent to the filter device, the first pipe body and the second pipe body are clamped and connected by the locking device, in view of this, the utility model provides a kind of external filter device for air conditioner pipeline, the purpose is to provide a kind of external filter device for air conditioner pipeline, which is quick to install, convenient to replace filter, and can be used without replacing the original air conditioning equipment.

Description

Technical Field

[0001] This utility model relates to air conditioning filter devices, and more particularly to an external filter device for air conditioning pipelines. Background Technology

[0002] With the increasing airtightness of modern buildings, indoor air pollution has become a growing problem. Prolonged exposure to enclosed environments makes people susceptible to harmful substances such as dust, bacteria, and viruses in the indoor air. This not only affects physical health but also reduces work and living comfort. To improve indoor air quality, it is necessary to use fresh air filtration devices. These devices introduce fresh outdoor air into the room, filter and purify it, and then distribute it to every corner of the room. During this process, the fresh air filtration device effectively removes various pollutants from the air, such as dust, pollen, bacteria, and viruses, providing a healthier and more comfortable indoor environment.

[0003] Existing fresh air filtration devices all require drilling for installation before they can be used. Moreover, if you want to use a fresh air filtration device and an air conditioning unit at the same time, you need to replace the air conditioning unit with one that already has a fresh air filtration device. This increases the installation cost of the fresh air filtration device. In addition, the filter pads of the fresh air system need to be cleaned or replaced regularly. However, when replacing the filter pads of existing fresh air filtration devices and air conditioning units with fresh air systems, the fresh air filtration device must be removed. This undoubtedly increases the steps and operational difficulty of replacing the filter pads. Furthermore, if the filter pads are not installed properly, it will affect the filtration effect of the fresh air filtration device. Utility Model Content

[0004] In view of this, the present invention provides an external filter device for air conditioning pipelines; the purpose is to provide an external filter device for air conditioning pipelines that is quick to install, easy to replace the filter, and can be used without replacing the original air conditioning equipment.

[0005] This utility model provides an external filter device for air conditioning pipelines, including a first pipe body and a second pipe body that are interconnected. The first pipe body has a first engaging groove, and the second pipe body has a second engaging groove corresponding to the position of the first engaging groove. A filter device is engaged in both the first engaging groove and the second engaging groove. At least one locking device is provided adjacent to the filter device. The first pipe body and the second pipe body are engaged and connected by the locking device. The locking device includes a locking fastener, which penetrates the first tube and is locked in a locking groove on the second tube, and the end of the locking fastener is slidably disposed in a locking groove at the end of the locking groove. The locking fastener includes a locking pin, a push plate at the top of the locking pin, a locking block at the bottom of the locking pin, a receiving groove at the bottom of the locking pin corresponding to the position of the locking block, a first pull rod extending through the locking pin from top to bottom, a pull ring at the beginning of the first pull rod, the end of the first pull rod penetrating the top wall of the receiving groove and rotatably connected to the beginning of a second pull rod, and the end of the second pull rod rotatably connected to the side of the locking block.

[0006] Furthermore, the locking groove is arranged perpendicularly to the locking groove.

[0007] Furthermore, the filtering device includes a filter sheet, and a filter sheet shell is arranged around the outer periphery of the filter sheet. Limiting plates are arranged on the upper part of both sides of the filter sheet shell. A limiting groove is opened in the first tube body corresponding to the position of the limiting plate, and the limiting plate is engaged in the limiting groove.

[0008] Furthermore, protrusions are provided on the two side walls of the first engaging groove at positions corresponding to the limiting grooves. The length of the protrusions is less than half the length of the first engaging groove, and the protrusions are engaged in the corresponding limiting grooves.

[0009] Furthermore, the inner wall of the second tube is provided with a locking groove corresponding to the position of the filter housing, and the end of the filter housing is locked in the locking groove.

[0010] Furthermore, a rotating connector is provided at the end of the first tube body opposite to the first engaging groove, and multiple protruding ridges are evenly distributed on the outer peripheral surface of the rotating connector.

[0011] Furthermore, a connecting protrusion is provided on the outer periphery of the rotating connector, and a connecting groove is provided on the inner wall of the first tube corresponding to the position of the connecting protrusion. The connecting protrusion is rotated and engaged in the connecting groove.

[0012] Furthermore, the pull ring is rotatably connected to the first pull rod.

[0013] Furthermore, a slot is provided on one side wall of the locking block corresponding to the position of the second pull rod, and the end of the second pull rod is rotatably disposed at the bottom of the slot via a rotating connecting roller.

[0014] Furthermore, a limiting block is provided through the center of the first pull rod, the limiting block slides between the first pull rod and the locking post, and the outer wall of the limiting block is in contact with the locking post.

[0015] The beneficial effects of this utility model are as follows: 1. This utility model employs a first and second interconnected pipe body, solving the problem of complex installation of existing fresh air filtration devices. It also addresses the issue that when both a fresh air filtration device and an air conditioner are needed simultaneously, only air conditioning units with a fresh air filtration device can be replaced. Furthermore, it solves the problem of complicated operation and potential filtration efficiency issues caused by improper installation when replacing filter elements in existing fresh air filtration devices. In use, first connect the air outlet of the second pipe body to the air inlet duct of the indoor unit of the air conditioner. Then connect the air inlet of the rotating connector at the end of the first pipe body to the air supply duct of the outdoor unit of the air conditioner. Next, insert the end of the second pipe body furthest from the air outlet into the end of the first pipe body furthest from the air inlet, ensuring a tight fit between the inner wall of the first pipe body and the outer surface of the second pipe body (because the rotating connector is connected to the first pipe body, the air inlet duct of the indoor unit and the air supply duct of the outdoor unit can be connected through this device after installation). Then, adjust the first and second locking slots to a parallel and connected position, insert the filter element housing into the two locking slots, ensuring that the bottom end of the filter element housing is precisely engaged in the locking limiting groove at the bottom of the second pipe body. Because the rotating connector engages with the connecting groove of the first pipe body via the connecting protrusion ring, the position of the outdoor unit's air supply pipe remains fixed when the first pipe body is rotated, preventing damage to the air supply pipe due to rotation. Rotating the first pipe body causes the ends of the two engaging grooves to overlap or cross. At this time, the protrusion on the inner wall of the first engaging groove will engage in the limiting groove on the upper part of the filter housing, firmly fixing the filter housing. When the engaging fastener rotates to the end of the locking groove, press down on the pull ring to move the first pull rod down. Because the locking block contacts the bottom surface of the receiving groove to form a limit, the second pull rod changes from a vertical state to a horizontal state under the combined force of horizontal and vertical directions, pushing the locking block out of the receiving groove and engaging in the locking groove. After locking, the pull ring can be flipped to a position close to the first or second pipe body to prevent collisions that could cause the pull ring to separate from the first pull rod, ensuring stable use of the locking device. The installation operation is now complete. Filter replacement steps: When replacing the filter, simply pull up the pull ring to move the first pull rod up and retract the locking block into the receiving groove. At this point, rotate the first tube to separate the ends of the first and second locking slots, allowing the filter housing to be removed. There are two replacement methods: one is to directly place the new filter housing with the filter inside into the two locking slots; the other is to first remove the old filter from the original housing, replace it with the new filter, and then put the housing back in. After replacement, follow the installation steps described above, rotate the first tube to engage the protrusion in the limiting groove, and press the pull ring to lock it in place, thus completing the filter replacement. The external design eliminates the need for modification or replacement of the original air conditioning equipment or drilling. The tube connection and locking device allow for quick fixation, significantly reducing installation costs and operational difficulty. It is compatible with the indoor unit air intake duct and outdoor unit air supply duct of most split-type air conditioners, improving the practicality of this invention. This invention simplifies the filter replacement process, increases the efficiency of filter replacement, and enhances the convenience of this invention.

[0016] 2. This utility model employs a filter housing surrounding the outer periphery of the filter element. Symmetrical limiting grooves on the upper part of both sides of the filter housing engage with protrusions on the inner wall of the first engaging groove, firmly locking the filter housing within the first and second engaging grooves. This reduces the number of steps required to install the filter. When replacing the filter, simply pull the ring upwards to move the first pull rod upwards, retracting the locking block into the receiving groove. Then, rotate the first tube to separate the ends of the first and second engaging grooves, allowing the filter housing to be removed. Two replacement methods are available: one is to directly place the new filter housing with the filter element into the two engaging grooves; the other is to first remove the old filter element from the original housing, replace it with the new one, and then put the housing back in. After replacement, follow the installation steps described above: rotate the first tube to engage the protrusions in the limiting grooves, press the ring to lock, and the filter replacement is complete. This improves the efficiency of filter replacement, as well as the convenience and practicality of this utility model.

[0017] 3. This utility model adopts a locking and limiting groove set at the lower part of the second tube body and a filter shell, so that the filter shell can be locked in the locking and limiting groove during installation. This prevents the filter effect of the fresh air filtration device from being affected due to improper installation or replacement of the filter. This improves the efficiency of installing and replacing the filter, and enhances the convenience and practicality of this utility model.

[0018] 4. This utility model adopts a combination of a first pipe body and a rotating connector. Since the rotating connector engages with the connecting groove of the first pipe body through a connecting protrusion ring, the position of the outdoor unit's air supply pipe remains fixed when the first pipe body is rotated, which can prevent the air supply pipe from being damaged due to rotation. Therefore, when installing or replacing the filter, it makes the rotation of the first pipe body more convenient and is not restricted by the position of the outdoor unit's air supply pipe, thereby improving the service life of the outdoor unit's air supply pipe. It also makes the operation of replacing the filter more labor-saving and convenient, thus improving the convenience and practicality of this utility model.

[0019] 5. This utility model adopts a combination of a rotating pull ring and a first pull rod. After the locking device completes the locking operation, when replacing the filter, simply pull the pull ring upward to move the first pull rod upward and retract the locking block into the receiving groove. At this time, rotate the first tube to separate the ends of the first locking groove and the second locking groove, and the filter shell can be taken out. Then, the filter can be replaced, which improves the practicality of this utility model.

[0020] 6. This utility model, by creating a slot on one side wall of the locking block, allows the second pull rod to rotate into the slot, ensuring that the second pull rod can better change its position and direction. At the same time, it allows the locking block to retract into the receiving groove more effectively, extending the service life of the second pull rod and the locking block. Furthermore, it ensures that the locking fastener can slide more smoothly in the locking slot when rotating the first tube, improving the user experience and practicality of this utility model.

[0021] 7. This utility model, by using a limiting block that penetrates through the center of the first pull rod, allows the first pull rod to slide smoothly vertically within the locking pin. This prevents the first pull rod from shaking when pulled or pressed, effectively reducing the pulling or pushing forces in other directions on the second pull rod caused by the shaking of the first pull rod itself. This reduces the mechanical damage to the rotating connecting parts and the impact on the normal use of the locking device, thus improving the service life and user experience of the locking device and enhancing the practicality of this utility model. Attached Figure Description

[0022] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a side view of the structure of this utility model; Figure 3 This is a side sectional view of the present invention. Figure 4 for Figure 3 A magnified structural diagram of A in the middle; Figure 5 This is a side sectional view of the snap-fit ​​fastener of this utility model.

[0023] Reference numerals: 1. First tube body, 2. Second tube body, 3. First engaging groove, 4. Second engaging groove, 5. Filter device, 6. Locking groove, 7. Locking post, 8. Push plate, 9. Receiving groove, 10. Locking block, 11. First pull rod, 12. Pull ring, 13. Second pull rod, 14. Filter sheet shell, 15. Limiting groove, 16. Protrusion, 17. Engaging limiting groove, 18. Rotating connector, 19. Connecting protrusion ring, 20. Connecting groove, 21. Protrusion, 22. Locking groove, 23. Limiting block, 24. Air inlet, 25. Air outlet, 26. Engaging fixing component. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] like Figure 1 , Figure 2 , Figure 3As shown, this utility model provides an external filter device for air conditioning pipelines, including a first pipe body 1 and a second pipe body 2 that are interconnected. The first pipe body 1 and the second pipe body 2 are preferably made of metal, such as an aluminum profile frame, an aluminum plate folded frame, a galvanized frame, or a stainless steel frame. One end of the first pipe body 1 is fitted onto the outer circumferential surface of one end of the second pipe body 2. A first engaging groove 3 is provided at the end where the first pipe body 1 connects to the second pipe body 2. A second engaging groove 4 is provided at the end of the second pipe body 2, parallel to the first engaging groove 3. The length of the locking groove 3 is greater than half the circumference of the first tube body 1 and less than two-thirds of the circumference of the first tube body 1. The length of the second locking groove 4 is half the circumference of the second tube body 2. A protrusion 16 is provided on the part of the first locking groove 3 that extends beyond the second locking groove 4. A filter device 5 is engaged and installed in both the first locking groove 3 and the second locking groove 4. The filter device 5 includes a filter sheet. A filter sheet shell 14 is arranged around the outer periphery of the filter sheet (the overall size of the filter sheet shell 14 needs to be precisely matched with the first locking groove and the second locking groove). The length error is preferably ≤ ±0.5mm, the width error is preferably ≤ ±0.3mm, and the thickness error is preferably ≤ ±0.2mm (to avoid loosening and air leakage or inability to insert due to dimensional deviations). Limiting plates extend from the upper part of both sides of the filter housing 14. A limiting groove 15 is formed in the first tube 1 corresponding to the position of the limiting plate. The limiting plate is engaged within the limiting groove 15. Protrusions 16 are provided on the two side walls of the first engaging groove 3 corresponding to the positions of the limiting groove 15. At one end of the first engaging groove 3, i.e., the part of the first engaging groove 3 that is longer than the second engaging groove 4, the protrusions 16 are respectively engaged in the corresponding limiting grooves 15. The inner wall of the second tube 2 is provided with engaging limiting grooves 17 corresponding to the position of the filter sheet shell 14. The end of the filter sheet shell 14 is engaged in the engaging limiting grooves 17. The filter media type of the above-mentioned filter sheet 5 needs to be selected according to the different filtration effects and application scenarios. For example: Basic type (ordinary household scenarios): It needs to reach the primary filtration level (G3-G4, according to GB / T 14295), with a filtration efficiency of ≥80% for ≥5μm particles, and can remove dust, hair, and large particulate impurities; Advanced type (office / sensitive population scenarios): It needs to reach the medium filtration level (F5-F6), with a filtration efficiency of ≥50% for ≥1μm particles, and can also add an activated carbon layer (activated carbon filling amount ≥50g / m³). 2 Formaldehyde and odor removal rate ≥30% (according to GB / T 18801); Special model (high temperature / humidity scenario): The filter must use "high temperature resistant + moisture resistant base material", such as glass fiber filter material (temperature resistance ≤120℃) or polyester fiber filter material (water absorption rate ≤5%), to avoid high temperature deformation or dampness and mold; at the same time, the filter must be within the rated air volume (suitable for air conditioning air volume, usually 100-300m³ / h). 3The initial resistance at ≤50Pa and final resistance at ≤150Pa (to avoid excessive resistance leading to reduced airflow and increased energy consumption) are required. The filter element must employ a pleated structure (pleat spacing ≥5mm) to increase the filtration area, reduce the airflow velocity per unit area, and further control resistance. Simultaneously, the initial filter material must have a dust holding capacity ≥100g / m³. 2 Medium-efficiency filter material with a dust holding capacity of ≥200g / m³ 2 (According to GB / T14295), ensure that the filter element's service life meets the replacement cycle of "3-6 months for ordinary scenarios and 1-2 months for heavily polluted scenarios" to reduce maintenance frequency.

[0028] like Figure 3 , Figure 4 , Figure 5 As shown, at least one locking device (two locking devices symmetrically arranged in the figure) is provided near the first engagement groove 3 in the first tube body 1. The locking device includes an engagement fixing member 26 provided through the top wall of the first tube body 1, and a locking groove (not shown in the figure) opened on the second tube body 2 at the position corresponding to the engagement fixing member 26. The end of the engagement fixing member 26 is slidably disposed in the locking groove, and the end of the locking groove is provided with a locking groove 6. The locking groove 6 is perpendicular to the locking groove. The engagement fixing member 26 includes a locking post 7. A push plate 8 is provided on the top of the locking post 7 extending to one side. A receiving groove 9 is opened at the bottom of the locking post 7. A locking block 10 is engaged in the receiving groove 9. A first pull rod 11 is provided through the locking post 7 from top to bottom. A limit block 23 is provided through the center of the first pull rod 11. The limit block 23 slides between the first pull rod 11 and the locking post 7, and the outer wall of the limit block 23 is perpendicular to the locking post 7. The locking pin 7 is in contact with the locking pin. The first pull rod 11 has a pull ring 12 at its beginning. The pull ring 12 is connected to the first pull rod 11 by a rotating connecting roller. After the locking device completes the locking operation, the pull ring 12 can be flipped to a position close to the first tube 1 or the second tube 2 to prevent the pull ring 12 from separating from the first pull rod 11 due to collision, which would affect the normal use of the locking device. The end of the first pull rod 11 passes through the top wall of the receiving groove 9 and is connected to the beginning of the second pull rod 13 by a rotating connecting roller. A slot 22 is opened on one side wall of the locking block 10 corresponding to the position of the second pull rod 13. The end of the second pull rod 13 is set at the bottom of the slot 22 by a rotating connecting roller. The above-mentioned rotating connecting rollers are any kind of rotating connecting shaft or any kind of rotating connection structure that can realize the rotation method on the market, such as the non-standard customized single-section cross coupling of the brand Xinruiyin.

[0029] like Figure 3As shown, a rotating connector 18 is provided at one end of the first pipe body 1 opposite to the first engaging groove 3. A connecting protrusion 19 is provided at the end of the rotating connector 18 that is connected to the first pipe body 1. A connecting groove 20 is provided on the inner wall of the first pipe body 1 corresponding to the connecting protrusion 19. The connecting protrusion 19 is engaged in the connecting groove 20. Multiple protrusions 21 are evenly distributed on the outer peripheral surface of the rotating connector 18 outside the first pipe body 1. The multiple protrusions 21 can be threaded to be screwed to the air supply pipe of the outdoor unit, or they can be staggered anti-slip structures. The protrusions 21 make the rotating connector 18 and the air supply pipe of the outdoor unit securely engaged and connected together.

[0030] like Figure 3 As shown, the second pipe body 2 extends outward from the end away from the first pipe body 1 and has an air outlet 25. Multiple protruding ridges 21 are evenly distributed on the outer surface of the air outlet 25. These protruding ridges 21 have the same structure and function as the protruding ridges 21 on the outer surface of the aforementioned rotating connector 18. The air outlet 25 needs to be tightly connected to the air inlet duct of the indoor unit of the air conditioner. During air conditioner operation (especially during compressor startup and fan operation), continuous vibration is generated. 1. The protruding ridges 21 improve connection stability through two structural forms: If it is a threaded protruding ridge: it can be precisely threaded into the internal thread of the indoor unit's air inlet duct, forming a "mechanical locking" structure to prevent vibration from causing the interface to loosen; If it is a staggered anti-slip protruding ridge: the protruding ridge forms multi-point frictional contact with the inner wall of the duct, increasing the static friction at the interface, offsetting the lateral / longitudinal displacement caused by vibration, and preventing the duct from separating from the air outlet 25; 2. If there is a gap at the interface between the air outlet 25 and the indoor unit's air inlet duct, unfiltered outdoor air (including dust, bacteria, etc.) will seep in through the gap, directly affecting the filtration effect. The raised rib 21 achieves enhanced sealing through "physical filling of gaps": the raised rib fits tightly against the inner wall of the pipe, forming multiple "contact sealing lines," replacing the single contact of a smooth surface and reducing the gap area; 3. During the docking / disassembly process between the air outlet 25 and the indoor unit's air inlet pipe, smooth surfaces are prone to scratches and deformation due to friction, affecting long-term sealing performance. The raised rib 21 can act as a "stress buffer layer": during docking, the raised rib preferentially contacts the inner wall of the pipe, avoiding direct friction damage to the outer periphery of the air outlet 25; in long-term use, even if the raised rib shows slight wear, the interface performance can be restored by replacing the raised rib (such as a detachable raised rib ring), without replacing the entire second pipe body, thus extending the service life of the device.

[0031] 1. Preparations before installation 1) Check the integrity of the device components: Confirm that the first tube, the second tube, the filter housing (including the filter), the locking device (clamping fastener, pull ring, etc.), and the rotating connecting parts are undamaged or missing.

[0032] 2) Check size compatibility: Measure the diameter of the air inlet duct of the indoor unit and the air outlet duct of the outdoor unit to ensure that they match the size of the air outlet and rotating connectors of the device (it is recommended to allow ±0.5mm error to avoid loose connections and air leakage).

[0033] 3) Clean the connection interface: Clean the dust and oil stains at the air conditioning pipe interface to avoid impurities affecting the sealing effect or scratching the device components.

[0034] 2. Safety Operating Instructions 1) The power to the air conditioner must be turned off before installation / replacement, and the operation should only be carried out after the fan has completely stopped running to prevent the risk of hands being caught or electric shock.

[0035] 2) Avoid using sharp tools to contact the tube or filter during operation to prevent damage to the parts; apply moderate force when pressing / pulling the locking device to avoid deformation of the lever or locking block.

[0036] 3) When installing outdoors, anti-slip measures must be taken, and safety equipment must be worn when working at heights to avoid the device falling or people getting injured.

[0037] 3. Maintenance Cycle and Judgment Criteria 1) Filter replacement cycle: 3-6 months for ordinary household use, 1-2 months for office / heavy pollution scenarios; when the air conditioner's air volume decreases significantly and a large amount of dust is visible on the surface of the filter, it needs to be replaced immediately.

[0038] 2) Device inspection cycle: Check the locking device for looseness, the interface for air leakage, and the rotating connection for smoothness every month. If any problems are found, tighten or replace the parts in time.

[0039] 3) Storage requirements for filter sheets: Spare filter sheets should be stored in a dry, ventilated place to avoid moisture, mold, or aging due to direct sunlight.

[0040] 4. Troubleshooting Common Faults 1) Air leakage at the interface: Check if the ridge is tightly clamped to the pipe. You can wrap a ring of sealing tape around it to enhance the seal. If the ridge is worn, you need to replace the rotating connector or the air outlet component.

[0041] 2) The locking device cannot be locked: Check whether the locking block has fully popped out into the locking groove. If it is stuck, apply a small amount of lubricant. If the lever is deformed, the locking fastener needs to be replaced.

[0042] 3) Loose filter installation: Confirm that the bottom of the filter housing is engaged in the locking groove and that the protrusion is precisely aligned with the locking groove. Rotate the tube again to secure it.

[0043] 5. Compatibility Scope Description 1) Specify the applicable air conditioner type: Applicable to split-type household / commercial air conditioners (wall-mounted units, cabinet units), but not applicable to central air conditioning duct systems.

[0044] 2) Specify the pipe diameter compatibility range: For example, the compatible air outlet / inlet pipe diameter is 80-120mm (can be adjusted according to the actual product specifications). If it exceeds the range, custom accessories are required.

[0045] The specific working principle is as follows: Installation and Operation Steps: During use, first connect the air outlet of the second pipe to the air inlet duct of the indoor unit of the air conditioner. Then connect the air inlet of the rotating connector at the end of the first pipe to the air supply duct of the outdoor unit of the air conditioner. Next, insert the end of the second pipe furthest from the air outlet into the end of the first pipe furthest from the air inlet, ensuring a tight fit between the inner wall of the first pipe and the outer surface of the second pipe (because the rotating connector is connected to the first pipe, the air inlet duct of the indoor unit and the air supply duct of the outdoor unit can be connected through this device after installation).

[0046] Next, adjust the first and second engaging slots to a parallel and connected position, and insert the filter housing of the filter device into the two engaging slots, ensuring that the bottom end of the filter housing is precisely engaged in the engaging limiting groove at the bottom of the second pipe body. Since the rotating connector engages with the connecting groove of the first pipe body via the connecting protrusion, the position of the outdoor unit's air supply pipe remains fixed when the first pipe body is rotated, preventing damage to the air supply pipe due to rotation. Rotating the first pipe body causes the ends of the two engaging slots to overlap or cross. At this point, the protrusion on the inner wall of the first engaging slot will engage in the limiting groove at the top of the filter housing, firmly fixing the filter housing in place.

[0047] When the locking fastener rotates to the end of the locking groove, press down on the pull ring to move the first pull rod downwards. As the locking block contacts the bottom surface of the receiving groove, forming a limit, the second pull rod, under the combined force of horizontal and vertical directions, changes from a vertical to a horizontal position, pushing the locking block out of the receiving groove and locking it into the locking groove. After locking, the pull ring can be flipped to a position close to the first or second tube body to prevent collisions that could cause the pull ring to separate from the first pull rod, ensuring stable use of the locking device. The installation operation is now complete.

[0048] Filter replacement procedure: To replace the filter, simply pull the pull ring upwards to move the first pull rod upwards and retract the locking block into the receiving groove. Then, rotate the first tube to separate the ends of the first and second locking grooves, allowing you to remove the filter housing.

[0049] There are two replacement methods: one is to directly place the new filter housing with the filter element into the two locking slots; the other is to first remove the old filter element from the original housing, replace it with the new filter element, and then put the housing back in. After putting it back in, follow the installation steps described above, rotate the first tube to make the protrusion engage with the limiting groove, and press the pull ring to lock it in place. This completes the filter replacement.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An external filter device for air conditioning pipelines, characterized in that: The device includes a first tube and a second tube that are interconnected. The first tube has a first engaging groove, and the second tube has a second engaging groove corresponding to the first engaging groove. A filter device is engaged in both the first engaging groove and the second engaging groove. At least one locking device is provided adjacent to the filter device. The first tube and the second tube are engaged and connected by the locking device. The locking device includes a locking fastener, which penetrates the first tube and is locked in a locking groove on the second tube, and the end of the locking fastener is slidably disposed in a locking groove at the end of the locking groove. The locking fastener includes a locking pin, a push plate at the top of the locking pin, a locking block at the bottom of the locking pin, a receiving groove at the bottom of the locking pin corresponding to the position of the locking block, a first pull rod extending through the locking pin from top to bottom, a pull ring at the beginning of the first pull rod, the end of the first pull rod penetrating the top wall of the receiving groove and rotatably connected to the beginning of a second pull rod, and the end of the second pull rod rotatably connected to the side of the locking block.

2. The external filter device for air conditioning pipelines according to claim 1, characterized in that: The locking groove is arranged perpendicularly to the locking groove.

3. The external filter device for air conditioning pipelines according to claim 1, characterized in that: The filtering device includes a filter element, and a filter element housing is arranged around the outer periphery of the filter element. Limiting plates are arranged on the upper part of both sides of the filter element housing. A limiting groove is opened on the first tube body corresponding to the position of the limiting plate, and the limiting plate is engaged in the limiting groove.

4. An external filter device for air conditioning pipelines according to claim 3, characterized in that: On the two side walls of the first engaging groove, there are protrusions corresponding to the positions of the limiting grooves. The length of the protrusions is less than half the length of the first engaging groove, and the protrusions are engaged in the corresponding limiting grooves.

5. An external filter device for air conditioning pipelines according to claim 3, characterized in that: The inner wall of the second tube is provided with a locking groove corresponding to the position of the filter housing, and the end of the filter housing is locked in the locking groove.

6. An external filter device for air conditioning pipelines according to claim 1, characterized in that: A rotating connector is provided at the end of the first tube body opposite to the first engaging groove, and multiple protruding ridges are evenly distributed on the outer peripheral surface of the rotating connector.

7. An external filter device for air conditioning pipelines according to claim 6, characterized in that: The rotating connector has a connecting protrusion extending outward from its outer periphery, and the inner wall of the first tube has a connecting groove corresponding to the position of the connecting protrusion. The connecting protrusion rotates and engages within the connecting groove.

8. An external filter device for air conditioning pipelines according to claim 1, characterized in that: The pull ring is rotatably connected to the first pull rod.

9. An external filter device for air conditioning pipelines according to claim 1, characterized in that: A slot is provided on one side wall of the locking block corresponding to the position of the second pull rod, and the end of the second pull rod is rotatably positioned at the bottom of the slot via a rotating connecting roller.

10. An external filter device for air conditioning pipelines according to claim 1, characterized in that: A limiting block is provided through the center of the first pull rod. The limiting block slides between the first pull rod and the locking post, and the outer wall of the limiting block is in contact with the locking post.

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