Centrifugal fan with self-cleaning function

Abstract

This invention relates to the field of centrifugal fan technology, specifically a centrifugal fan with a self-cleaning function. The fan includes a casing with an air inlet frame fixedly connected to its surface and an air outlet. An impeller is rotatably connected to the inner wall of the casing. The impeller consists of a main shaft and multiple blades uniformly fixedly connected to the main shaft. A motor is fixedly connected to the surface of the casing. This invention draws power from the impeller's main shaft via a transmission assembly. After deceleration by the internal gear ring of the gear and gear, the ball bearings at the end of the push rod roll along the inclined plane of the triangular block, converting the circumferential motion into axial vibration of the slip ring. This vibration causes the filter element to shake off accumulated dust. The entire process eliminates the need for an independent vibration motor, avoiding additional power supply lines and control costs. Simultaneously, the internal gear ring deceleration keeps the impact frequency low, and combined with the rolling friction of the ball bearings, the operating noise is significantly lower than existing solutions using high-frequency vibration motors, meeting the quiet operation requirements of household air conditioners.

Description

Technical Field

[0001] This invention belongs to the field of centrifugal fan technology, specifically relating to a centrifugal fan with self-cleaning function. Background Technology

[0002] Centrifugal fans are the core air supply and heat exchange components of air conditioners, widely used in various air conditioning equipment such as household air conditioners and commercial central air conditioning systems. They are the key structure for air conditioning to achieve indoor air circulation, heat exchange, and ventilation. During long-term operation of air conditioning equipment, dust, hair, lint, and fine particulate matter in the ambient air will continuously adhere to and accumulate on the surface of the centrifugal fan's air inlet filter. With the increase in usage time, the filter pores gradually become clogged, directly leading to a decrease in the air volume of the air conditioner, a significant reduction in heat exchange efficiency, an increase in the overall power consumption of the unit, and an increase in air supply noise. At the same time, dust accumulation on the filter can easily breed mold and produce odors, which are spread into the indoor space with the air supply, polluting the indoor air environment and affecting the health of users. Furthermore, filter clogging increases the fan load, further aggravating energy consumption, which is inconsistent with the development concept of low-carbon and energy-saving home appliances. This is a common technical pain point in the long-term use of air conditioning equipment.

[0003] Currently, most centrifugal fans in existing air conditioning equipment rely on manual disassembly and cleaning for their filters. This is cumbersome, has a long maintenance cycle, and cannot achieve routine cleaning. Even the few air conditioning centrifugal fans equipped with self-cleaning functions still have some technical defects.

[0004] Existing self-cleaning solutions for air conditioner fans mainly fall into three categories: The first is external vibration motor-driven dust removal, which uses an independent vibration motor in conjunction with an electronic control program to achieve filter vibration and dust removal. This structure requires power supply and control circuitry, increasing the overall production cost and internal assembly space of the air conditioner, contradicting the design trend of highly integrated and miniaturized internal structures. Furthermore, the high-frequency vibration of the external motor is prone to abnormal noise and aging failure. The additional power components also continuously increase standby and operating energy consumption, hindering overall energy saving and consumption reduction. The second is a spray-wash self-cleaning structure, relying on... The water pump and spray pipes wash and clean the filter screen. This structure requires reserved space for water circuit installation, is bulky and complex, has poor adaptability, and is difficult to adapt to conventional wall-mounted and floor-standing household air conditioners. The water circulation drive also generates additional energy consumption, increasing the daily power consumption of the air conditioner. The third is the fixed scraper dust removal structure, which uses a hard scraper to scrape off the accumulated dust by hard contact with the filter screen. Long-term friction can easily cause deformation and damage to the air conditioner's special precision filter screen. Moreover, the fine dust scraped off is easily picked up by the high-speed airflow of the fan, forming secondary dust. The dust removal is not thorough and it is difficult to fundamentally solve the problem of dirty and blocked air outlet of the air conditioner. In summary, existing self-cleaning technologies for centrifugal fans used in air conditioners generally suffer from problems such as reliance on external power, incomplete dust removal, easy generation of secondary dust, inconvenient filter disassembly and maintenance, high additional energy consumption, and poor energy efficiency. Therefore, it is necessary to design a centrifugal fan with self-cleaning function. Summary of the Invention

[0005] The purpose of this invention is to provide a centrifugal fan with a simple structure and reasonable design that has a self-cleaning function in order to solve the above problems.

[0006] The present invention achieves the above objectives through the following technical solutions: A centrifugal fan with a self-cleaning function includes a casing, an air inlet frame fixedly connected to the surface of the casing, an air outlet on the casing, an impeller rotatably connected to the inner wall of the casing, the impeller consisting of a main shaft and multiple blades evenly fixedly connected to the main shaft, a motor fixedly connected to the surface of the casing, the motor being fixedly connected to the main shaft of the impeller, and a self-cleaning device provided on the inner wall of the air inlet frame, the self-cleaning device including a support ring fixedly connected to the inner wall of the air inlet frame, and multiple elastic... One telescopic rod, and one end of multiple elastic telescopic rods are fixedly connected to a slip ring. The slip ring is slidably connected to the air inlet frame. The slip ring is provided with a disassembly and assembly assembly and a filter element installed on the slip ring through the disassembly and assembly assembly. A transmission assembly is provided between the impeller and the air inlet frame. A vibration assembly is provided between the transmission assembly and the slip ring. A collection device is provided on the air inlet frame. The collection device includes an arc-shaped hole opened on the air inlet frame. A sealing frame is fixedly connected to the arc-shaped hole. A collection assembly and a dust guiding assembly are provided on the sealing frame.

[0007] As a further optimization of the present invention, the filter element includes a ring and a filter screen fixedly connected to the inner wall of the ring, wherein the ring is made of magnetic material.

[0008] As a further optimization of the present invention, the disassembly and assembly assembly includes a plurality of positioning rods that are uniformly fixedly connected to the surface of the slip ring along the circumference. The ring has circular holes corresponding to the number of positioning rods. The size of the positioning rods is adapted to the size of the circular holes. A plurality of magnetic strips are fixedly embedded in the slip ring and are uniformly distributed along the circumference. The magnetic strips are magnetically attracted to the ring.

[0009] As a further optimization of the present invention, the transmission assembly includes a rotating rod fixedly connected to the end of the impeller's main shaft, a first transmission wheel fixedly connected to the end of the rotating rod, a bracket fixedly connected to the inner wall of the air inlet frame, a second transmission wheel rotatably connected to the surface of the bracket via a rotating shaft, a transmission component connecting the first and second transmission wheels together, a gear fixedly connected to the surface of the second transmission wheel, and a gear ring rotatably connected to the inner wall of the air inlet frame, with the gear ring meshing with the gear.

[0010] As a further optimization of the present invention, the vibration assembly includes two push rods symmetrically fixedly connected to the surface of the toothed ring, and two triangular blocks symmetrically fixedly connected to the surface of the slip ring, with the push rods and triangular blocks used in conjunction.

[0011] As a further optimization of the present invention, the end of the push rod is provided with a ball bearing, which is a sphere.

[0012] As a further optimization of the present invention, the collection component includes a collection box slidably connected to a sealing frame, a handle fixedly connected to the surface of the collection box, and a vacuum cleaner placed inside the collection box.

[0013] As a further optimization of the present invention, the dust guiding assembly includes two support plates symmetrically and fixedly connected to both sides of the inner wall of the sealing frame. Two elastic telescopic rods are fixedly connected to the support plates, and inclined plates are fixedly connected to the two elastic telescopic rods on the two support plates. The two inclined plates are in the shape of an inverted V.

[0014] As a further optimization of the present invention, a first step block is fixedly connected to the inclined plate, and a second step block that cooperates with the first step block is fixedly connected to the slip ring.

[0015] The beneficial effects of this invention are as follows: 1. Power is drawn from the impeller shaft via a transmission assembly. After deceleration by the internal gear ring of the gear and gear ring, the ball bearings at the end of the push rod roll along the inclined plane of the triangular block, converting the circumferential motion into the axial vibration of the slip ring. This causes the filter elements to shake off accumulated dust. The entire process does not require an additional independent vibration motor, avoiding extra power supply lines and control costs. At the same time, the impact frequency is controlled to a low range by the internal gear ring deceleration. Combined with the rolling friction of the ball bearings, the operating noise is significantly lower than existing solutions using high-frequency vibration motors, meeting the requirements of quiet performance for household air conditioners. Furthermore, this structure relies entirely on the fan's own power to complete the self-cleaning operation, requiring no external auxiliary power source, avoiding extra energy consumption, and exhibiting excellent energy-saving performance.

[0016] 2. Dust is shaken off by periodic contact between the push rod and the triangular block to generate axial vibration. There is no continuous friction or hard scraping between the push rod and the filter element, avoiding wear on the air conditioner's precision filter. At the same time, the upper opening of the inverted V-shaped inclined plate is large and the lower opening is small. The narrowing airflow acceleration effect prevents dust in the collection box from flowing back to the air inlet frame under negative pressure. This solves the problems of easy damage to the filter by scraper cleaning and easy secondary re-entrainment of shaken dust in the existing technology. The filter is kept clean and unobstructed for a long time, which can ensure that the fan always operates under rated low load conditions, reduce power loss caused by filter blockage, and thus optimize the overall energy-saving performance of the air conditioner.

[0017] 3. The positioning rod and the round hole restrict the circumferential rotation of the filter element, while the magnetic strip and magnetic ring provide axial anti-detachment force, enabling tool-free quick installation and removal of the filter element. Simultaneously, when the slip ring vibrates, it drives the first stepladder via the second stepladder, causing the inclined plate to vibrate synchronously, ensuring that all dust on the inclined plate surface falls into the collection box. From power take-off, deceleration, vibration cleaning to dust collection and the inclined plate's coordinated dust shaking, all components work together to form a complete closed loop, simultaneously completing self-cleaning during normal air conditioner operation without manual intervention. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the housing and air inlet frame in this invention; Figure 3 In this invention Figure 2 Enlarged view of point A; Figure 4 This is a three-dimensional schematic diagram of the self-cleaning device and the collection device in this invention; Figure 5 This is a three-dimensional diagram showing the disassembled self-cleaning device in this invention; Figure 6 This is a three-dimensional cross-sectional view of the air inlet frame in this invention; Figure 7 In this invention Figure 6 Enlarged view of point B; Figure 8 This is a three-dimensional diagram showing the disassembled collection device in this invention; Figure 9 This is a three-dimensional schematic diagram of the inclined plate in this invention.

[0019] In the diagram: 1. Casing; 2. Impeller; 3. Motor; 4. Air inlet frame; 5. Air outlet; 6. Self-cleaning device; 601. Rotating rod; 602. Transmission wheel one; 603. Transmission component; 604. Bracket; 605. Transmission wheel two; 606. Gear; 607. Gear ring; 608. Push rod; 609. Ball bearing; 610. Support ring; 611. Elastic telescopic rod one; 612. Slip ring; 613. Positioning rod; 614. Magnet strip; 615. Filter element; 616. Triangular block; 7. Collection device; 71. Sealing frame; 72. Collection box; 73. Handle; 74. Dust collection component; 75. Support plate; 76. Elastic telescopic rod two; 77. Inclined plate; 78. Step block one; 79. Step block two. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] For examples, please refer to Figures 1-9 A centrifugal fan with self-cleaning function includes a casing 1, an air inlet frame 4 fixedly connected to the surface of the casing 1, an air outlet 5 on the casing 1, an impeller 2 rotatably connected to the inner wall of the casing 1, the impeller 2 consisting of a main shaft and multiple blades evenly fixedly connected to the main shaft, a motor 3 fixedly connected to the surface of the casing 1, the output end of the motor 3 being fixedly connected to the main shaft of the impeller 2, and a self-cleaning device 6 provided on the inner wall of the air inlet frame 4, the self-cleaning device 6 including a support ring 610 fixedly connected to the inner wall of the air inlet frame 4, and multiple elastic telescopic rods evenly fixedly connected to the support ring 610 along the circumference. 611, one end of multiple elastic telescopic rods 611 is fixedly connected to a slip ring 612, the slip ring 612 is slidably connected to the air inlet frame 4, the slip ring 612 is provided with a disassembly assembly and a filter element 615 installed on the slip ring 612 through the disassembly assembly, a transmission assembly is provided between the impeller 2 and the air inlet frame 4, and a vibration assembly is provided between the transmission assembly and the slip ring 612; the air inlet frame 4 is provided with a collection device 7, the collection device 7 includes an arc-shaped hole opened on the air inlet frame 4, a sealing frame 71 is fixedly connected to the arc-shaped hole, and a collection assembly and a dust guiding assembly are provided on the sealing frame 71.

[0022] In this embodiment, when the centrifugal fan starts, the motor 3 is energized and runs, driving the main shaft of the impeller 2 to rotate. The rotation of the impeller 2 generates negative pressure, drawing in external air through the air inlet frame 4. The air then passes through the filter element 615 into the casing 1 and is discharged through the air outlet 5, achieving normal air supply function. Simultaneously, the rotational power of the impeller 2 is transmitted to the vibration component via the transmission assembly. Driven by the transmission assembly, the vibration component generates periodic motion, which is transmitted through the vibration component and the slip ring 612. The mechanical connection between the components forces the slip ring 612 to reciprocate along the axial direction of the air inlet frame 4. When the vibration assembly drives the slip ring 612 to move axially, the slip ring 612 compresses the elastic telescopic rod 611. When the driving force of the vibration assembly is removed, the elastic telescopic rod 611 releases its elastic potential energy, pushing the slip ring 612 back to its original position. Thus, under the combined action of the periodic drive of the vibration assembly and the elastic reset of the elastic telescopic rod 611, the slip ring 612 forms continuous axial vibration. A filter element is installed on the slip ring 612 through a disassembly and assembly assembly. 615. The axial vibration of slip ring 612 is directly transmitted to filter element 615, causing filter element 615 to vibrate synchronously. Dust accumulated on the surface of filter element 615 is shaken off by the vibration and detaches from the surface. The shaken-off dust falls downwards under gravity. An arc-shaped hole is provided on the air inlet frame 4, through which some of the falling dust directly enters the sealing frame 71. The collection component is used to receive and store the falling dust. The dust guiding component on the sealing frame 71 guides the dust smoothly into the collection component and prevents... The collected dust flows back into the air inlet frame 4 under the action of negative pressure airflow. Thus, during normal air supply, the centrifugal fan takes power from the main shaft of the impeller 2 through the transmission component to realize power transmission, drive the vibration component to generate periodic vibration, drive the slip ring 612 and filter element 615 to vibrate axially, realize the self-cleaning of the filter element 615, and at the same time, through the cooperation of the arc-shaped hole, sealing frame 71, collection component and dust guiding component, the collection and sealing of the shaken dust is completed, forming a complete "power take-off-vibration-dust cleaning-collection" self-cleaning cycle.

[0023] It should be noted that the centrifugal fan is mounted on the bottom shell of the indoor unit of the air conditioner via a fan mounting bracket. Its air inlet frame 4 is sealed and connected to the return air vent of the indoor unit of the air conditioner, and the air outlet 5 is set opposite to the air inlet side of the heat exchanger of the indoor unit of the air conditioner. When the impeller 2 rotates, it generates negative pressure in the casing 1, which draws indoor air in through the return air vent and the air inlet frame 4. The air passes through the filter 615 and the inside of the casing 1 in sequence, and then is blown to the heat exchanger through the air outlet 5, thereby realizing the circulation and heat exchange of indoor air. The installation method between the centrifugal fan and the air conditioner is existing technology and will not be described in detail in this article.

[0024] Please see Figures 5-6The filter element 615 includes a ring and a filter screen fixedly connected to the inner wall of the ring. The ring is made of magnetic material. The assembly and disassembly assembly includes multiple positioning rods 613 that are evenly fixedly connected to the surface of the slip ring 612 along the circumference. The ring has circular holes corresponding to the number of positioning rods 613. The size of the positioning rods 613 is adapted to the size of the circular holes. Multiple magnetic strips 614 that are evenly distributed along the circumference are fixedly embedded in the slip ring 612. The magnetic strips 614 are magnetically attracted to the ring.

[0025] In this embodiment, when installing the filter element 615, the operator holds the ring of the filter element 615, aligns the circular hole on the ring with the positioning rod 613 on the slip ring 612, and then pushes the filter element 615 axially so that the positioning rod 613 is inserted into the circular hole. The engagement between the positioning rod 613 and the circular hole restricts the circumferential rotation of the filter element 615 relative to the slip ring 612. When the end face of the ring of the filter element 615 is in contact with the surface of the slip ring 612, the magnet strip 614 embedded in the slip ring 612 generates a magnetic attraction force with the ring made of magnetic material. The adsorption force presses the filter element 615 tightly against the surface of the slip ring 612 along the axial direction, preventing the filter element 615 from coming outward along the axial direction of the positioning rod 613. Thus, the positioning rod 613 and the magnetic strip 614 together form a dual fixing structure of "circumferential anti-rotation" and "axial anti-detachment". When disassembling the filter element 615, the operator overcomes the magnetic adsorption force between the magnetic strip 614 and the ring, pulls the filter element 615 outward along the axial direction, so that the ring and the magnetic strip 614 are separated. At the same time, the positioning rod 613 is withdrawn from the round hole, and the filter element 615 can be removed.

[0026] Please see Figures 2-5 The transmission assembly includes a rotating rod 601 fixedly connected to the end of the main shaft of the impeller 2. A transmission wheel 602 is fixedly connected to the end of the rotating rod 601. A bracket 604 is fixedly connected to the inner wall of the air inlet frame 4. A transmission wheel 605 is rotatably connected to the surface of the bracket 604 via a rotating shaft. A transmission component 603 is connected between the transmission wheel 602 and the transmission wheel 605. A gear 606 is fixedly connected to the surface of the transmission wheel 605. A gear ring 607 is rotatably connected to the inner wall of the air inlet frame 4. The gear ring 607 and the gear 606 are meshed together. The vibration assembly includes two push rods 608 symmetrically fixedly connected to the surface of the gear ring 607. Two triangular blocks 616 are symmetrically fixedly connected to the surface of the slip ring 612. The push rods 608 and the triangular blocks 616 are used in conjunction. A ball bearing 609 is rolled at the end of the push rod 608. The ball bearing 609 is a sphere.

[0027] In this embodiment, when the motor 3 starts, the motor 3 drives the main shaft of the impeller 2 to rotate. The main shaft drives the rotating rod 601 to rotate synchronously, and the transmission wheel 602 on the rotating rod 601 rotates accordingly. The transmission wheel 602 transmits the rotational power to the transmission wheel 605 through the transmission component 603. The transmission wheel 605 rotates around the rotating shaft on the bracket 604, and at the same time drives the gear 606 to rotate synchronously. The external teeth of the gear 606 mesh with the internal teeth of the gear ring 607, and the rotation of the gear 606... The drive gear ring 607 rotates around its axis. As the gear ring 607 rotates, the two push rods 608 on it move circumferentially. The balls 609 at the ends of the push rods 608 contact the two triangular blocks 616. When the push rod 608 moves to the position of the triangular blocks 616, the balls 609 first contact the tips of the triangular blocks 616, and then roll along the hypotenuse of the triangular blocks 616 towards the right-angle vertex. During this process, the inclined surface of the triangular blocks 616 pushes the push rod 608... The circumferential motion is converted into the axial motion of the slip ring 612. The pushing action of the ball 609 on the inclined plane forces the slip ring 612 to overcome the elastic force of the elastic telescopic rod 611 and move along the axial direction of the air inlet frame 4. The elastic telescopic rod 611 is compressed. When the ball 609 rolls past the right-angle vertex of the triangular block 616, the push rod 608 disengages from the triangular block 616. The elastic telescopic rod 611 releases its elastic potential energy instantaneously, pushing the slip ring 612 to quickly return to its original position along the axial direction, generating axial... Impact vibration is transmitted to the filter element 615 through the slip ring 612, causing the accumulated dust on the filter element 615 to be shaken off. After one push rod 608 completes pushing and disengaging from a triangular block 616, the toothed ring 607 continues to rotate half a turn, and the other push rod 608 begins to push the other triangular block 616. This cycle repeats. For each rotation of the toothed ring 607, the two push rods 608 push the two triangular blocks 616 once in turn, that is, two axial impact vibrations are generated per rotation.

[0028] It should be noted that the number of internal teeth of the gear ring 607 is an integer multiple of the number of external teeth of the gear 606. The number of internal teeth of the gear ring 607 is four, six, or eight times the number of external teeth of the gear 606. Therefore, the rotational speed of the gear ring 607 is one-quarter, one-sixth, or one-eighth of the rotational speed of the gear 606, thereby reducing the speed of the impeller 2 main shaft. The specific multiple can be adjusted according to the actual situation. In the transmission assembly, the transmission component 603 is preferably a synchronous belt, and the first transmission wheel 602 and the second transmission wheel 605 are preferably synchronous pulleys to achieve precise synchronous transmission and reduce operating noise. As an alternative, the transmission component 603 can also be a chain, and the first transmission wheel 602 and the second transmission wheel 605 can be sprockets; or a multi-ribbed belt can be used, and the first transmission wheel 602 and the second transmission wheel 605 can be multi-ribbed pulleys; or a flat belt or a V-belt can be used, and the first transmission wheel 602 and the second transmission wheel 605 can be flat pulleys or V-belt pulleys. The transmission component 603, the first transmission wheel 602, and the second transmission wheel 605 can be selected from the above options according to the implementation situation.

[0029] Please see Figures 6-9 The collection component includes a collection box 72 slidably connected to the sealing frame 71, a handle 73 fixedly connected to the surface of the collection box 72, and a dust collection component 74 placed inside the collection box 72. The dust guiding component includes two support plates 75 symmetrically fixedly connected to both sides of the inner wall of the sealing frame 71. A second elastic telescopic rod 76 is fixedly connected to the support plate 75. An inclined plate 77 is fixedly connected to the second elastic telescopic rod 76 on the two support plates 75. The two inclined plates 77 are in the shape of an inverted V. A first step block 78 is fixedly connected to the inclined plate 77. A second step block 79 that cooperates with the first step block 78 is fixedly connected to the slip ring 612.

[0030] In this embodiment, after the dust accumulated on the filter element 615 is shaken off, it falls downwards under the action of gravity. The dust in the middle area of ​​the filter element 615 falls directly into the collection box 72 inside the sealing frame 71 through the arc-shaped hole. The dust in the areas on both sides of the filter element 615 first falls onto the upper surface of the two inclined plates 77. Since the inclined plates 77 are arranged in an inverted V-shape with a large opening at the top and a small opening at the bottom, the dust slides downwards along the inclined surface of the inclined plates 77 and finally falls into the collection box 72 from the lower opening of the inclined plates 77. In the inverted V-shaped structure formed by the two inclined plates 77, the larger opening at the top is conducive to catching the falling dust, while the smaller opening at the bottom limits the cross-sectional area of ​​the airflow channel. When the centrifugal fan is working, the air inlet frame 4 is a negative pressure environment. External air is drawn in through the air inlet frame 4. The smaller opening at the bottom increases the airflow velocity in this area. At the same time, the dust particles are difficult to rise with the accelerated airflow due to their greater inertia, and the collection box... The airflow disturbance within 72 is also effectively attenuated by the constriction structure, thereby preventing the dust collected in the collection box 72 from being re-inhaled into the air inlet frame 4 under negative pressure. When the slip ring 612 generates axial vibration during the self-cleaning process, the second step block 79 on the slip ring 612 moves axially synchronously with the slip ring 612. The inclined surface of the second step block 79 periodically contacts the inclined surface of the first step block 78 and generates relative sliding. When the slip ring 612 moves towards the impeller 2, the second step block 79 pushes the first step block 78, causing the first step block 78 to drive the inclined plate 77 to overcome the elastic force of the second elastic telescopic rod 76 and move away from the slip ring 612. When the slip ring 612 resets, the second step block 79 separates from the first step block 78, and the second elastic telescopic rod 76 releases elastic potential energy, driving the inclined plate 77 to reset quickly and generate shaking. This shaking action completely shakes the dust attached to the surface of the inclined plate 77 into the collection box 72, preventing dust from accumulating on the inclined plate 77.

[0031] It should be noted that the dust collection component 74 can be made of sponge or polyurethane filter cotton. When a sponge is used as the dust collection component 74, an appropriate amount of water should be injected into the collection box 72 before installation to wet the sponge. The water will then be used to capture the dust that falls into the collection box 72, preventing the dust from flying around inside the collection box 72. When a dry polyurethane filter cotton is used, there is no need to add water; it can be removed and cleaned periodically. The elastic telescopic rod 611 and the elastic telescopic rod 76 have the same structure and are existing technologies, so they will not be described in detail here.

[0032] In actual use, when the air conditioning unit is started, motor 3 is powered on and drives the main shaft of impeller 2 to rotate. The rotation of impeller 2 generates negative pressure, drawing indoor air in through the air inlet frame 4. After passing through the filter screen of filter element 615, the air enters the casing 1 and is then discharged through the air outlet 5, achieving normal air circulation and heat exchange functions. Simultaneously, the rotation of the impeller 2's main shaft drives the rotating rod 601 to rotate synchronously. The first transmission wheel 602 on the rotating rod 601 drives the second transmission wheel 605 to rotate through the transmission element 603. The second transmission wheel 605 drives the gear 606 to rotate. The outer teeth of gear 606 mesh with the inner teeth of gear ring 607. Since the number of inner teeth of gear ring 607 is an integer multiple of the number of outer teeth of gear 606, gear ring 607 rotates around the inner wall of the air inlet frame 4 at a reduced speed. This deceleration transmission process does not rely on an external power source, but only utilizes the self-cleaning of the impeller 2's main shaft. The rotational energy of the ring causes the two push rods 608 to rotate circumferentially with the ring 607 as the toothed ring 607 rotates. The balls 609 at the ends of the push rods 608 contact the two triangular blocks 616 in sequence and roll along the inclined plane. As the balls 609 roll along the inclined plane of the triangular block 616 from the tip to the right-angle vertex, the inclined plane converts the circumferential motion of the push rods 608 into the axial motion of the slip ring 612, forcing the slip ring 612 to compress the elastic telescopic rod 611 and move axially. When the balls 609 pass the right-angle vertex and disengage from the triangular block 616, the elastic telescopic rod 611 instantly resets, pushing the slip ring 612 to move rapidly in the opposite direction, generating axial impact vibration. This vibration is directly transmitted to the filter element 615, causing the dust accumulated on the surface of the filter element 615 to be periodically shaken off. The two push rods 608 and the two triangular blocks 616 work alternately, and the toothed ring 607 generates two axial impact vibrations for every rotation. The shaken-off dust falls downwards under the action of gravity. The dust in the middle passes directly through the arc-shaped hole on the air inlet frame 4 and falls into the collection box 72 inside the sealing frame 71. The dust on both sides first falls onto the two inclined plates 77 arranged in an inverted V shape and slides into the collection box 72 along the inclined plates 77. The inverted V-shaped ramp 77 has a large opening at the top and a small opening at the bottom, creating a constricted air seal effect. This increases the airflow velocity at the constriction point, making it difficult for dust particles to rise with the airflow due to inertia. Simultaneously, airflow disturbances within the collection box 72 are effectively attenuated, preventing secondary dust backflow. When the slip ring 612 vibrates axially, the second step block 79 on the slip ring 612 moves synchronously with it. The inclined surface of the second step block 79 periodically pushes against the inclined surface of the first step block 78, causing the first step block 78 to drive the ramp 77 to compress the elastic telescopic rod 76 and generate displacement. When the second step block 79 separates from the first step block 78, the elastic telescopic rod 76 returns to its original position, driving the ramp 77 to shake, dislodging residual dust adhering to the surface of the ramp 77 into the collection box 72. When dust accumulates to a certain level in the collection box 72, the user opens the air conditioner casing. The centrifugal fan inside is exposed. The collection box 72 is pulled out of the sealing frame 71 by the handle 73. After cleaning the dust on the dust collection part 74, it can be reinstalled. If the filter 615 needs to be replaced or cleaned, the user can directly overcome the magnetic attraction of the magnetic strip 614 and pull the filter 615 outward along the axis to separate the round hole on the ring from the positioning rod 613. The filter 615 can then be removed for replacement or cleaning. During installation, the positioning rod 613 is aligned with the round hole and inserted. The magnetic strip 614 is automatically attracted and fixed without any tools. The above process forms a complete self-cleaning cycle of "power take-off-deceleration-vibration-collection-linkage dust shaking-maintenance". The filter 615 is automatically cleaned simultaneously during the normal operation of the air conditioner, without the need for frequent manual disassembly and cleaning by the user, and without relying on an additional power source.

[0033] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A centrifugal fan with self-cleaning function, comprising a casing (1), an air inlet frame (4) fixedly connected to the surface of the casing (1), an air outlet (5) provided on the casing (1), an impeller (2) rotatably connected to the inner wall of the casing (1), the impeller (2) being composed of a main shaft and multiple blades uniformly fixedly connected to the main shaft, and a motor (3) fixedly connected to the surface of the casing (1), the motor (3) being fixedly connected to the main shaft of the impeller (2), characterized in that: The inner wall of the air inlet frame (4) is provided with a self-cleaning device (6). The self-cleaning device (6) includes a support ring (610) fixedly connected to the inner wall of the air inlet frame (4). Multiple elastic telescopic rods (611) are evenly fixedly connected to the support ring (610) along the circumference. One end of the multiple elastic telescopic rods (611) is fixedly connected to a slip ring (612). The slip ring (612) is slidably connected to the air inlet frame (4). The slip ring (612) is provided with a disassembly and assembly assembly and a filter element (615) installed on the slip ring (612) through the disassembly and assembly assembly. A transmission assembly is provided between the impeller (2) and the air inlet frame (4). A vibration assembly is provided between the transmission assembly and the slip ring (612). The air inlet frame (4) is provided with a collection device (7), which includes an arc-shaped hole opened on the air inlet frame (4). A sealing frame (71) is fixedly connected to the arc-shaped hole, and a collection component and a dust guiding component are provided on the sealing frame (71).

2. A centrifugal fan with self-cleaning function according to claim 1, characterized in that: The filter element (615) includes a ring and a filter screen fixedly connected to the inner wall of the ring, the ring being made of magnetic material.

3. A centrifugal fan with self-cleaning function according to claim 2, characterized in that: The assembly and disassembly assembly includes multiple positioning rods (613) that are uniformly fixed to the surface of the slip ring (612) along the circumference. The ring has circular holes corresponding to the number of positioning rods (613). The size of the positioning rods (613) is adapted to the size of the circular holes. Multiple magnetic strips (614) that are uniformly distributed along the circumference are fixedly embedded in the slip ring (612). The magnetic strips (614) are magnetically attracted to the ring.

4. A centrifugal fan with self-cleaning function according to claim 1, characterized in that: The transmission assembly includes a rotating rod (601) fixedly connected to the end of the main shaft of the impeller (2). A transmission wheel (602) is fixedly connected to the end of the rotating rod (601). A bracket (604) is fixedly connected to the inner wall of the air inlet frame (4). A transmission wheel (605) is rotatably connected to the surface of the bracket (604) via a rotating shaft. A transmission component (603) is connected between the transmission wheel (602) and the transmission wheel (605). A gear (606) is fixedly connected to the surface of the transmission wheel (605). A gear ring (607) is rotatably connected to the inner wall of the air inlet frame (4). The gear ring (607) and the gear (606) are meshed together.

5. A centrifugal fan with self-cleaning function according to claim 4, characterized in that: The vibration assembly includes two push rods (608) symmetrically fixedly connected to the surface of the toothed ring (607), and two triangular blocks (616) symmetrically fixedly connected to the surface of the slip ring (612). The push rods (608) and triangular blocks (616) are used in conjunction.

6. A centrifugal fan with self-cleaning function according to claim 5, characterized in that: The end of the push rod (608) is provided with a ball bearing (609), which is a sphere.

7. A centrifugal fan with self-cleaning function according to claim 1, characterized in that: The collection assembly includes a collection box (72) slidably connected to a sealing frame (71), a handle (73) fixedly connected to the surface of the collection box (72), and a vacuum cleaner (74) placed inside the collection box (72).

8. A centrifugal fan with self-cleaning function according to claim 7, characterized in that: The dust guiding assembly includes two support plates (75) symmetrically fixedly connected to both sides of the inner wall of the sealing frame (71). The support plates (75) are fixedly connected to elastic telescopic rods (76), and the two support plates (75) are fixedly connected to inclined plates (77). The two inclined plates (77) are in the shape of an inverted V.

9. A centrifugal fan with self-cleaning function according to claim 8, characterized in that: A first step block (78) is fixedly connected to the inclined plate (77), and a second step block (79) that works in conjunction with the first step block (78) is fixedly connected to the slip ring (612).

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