Energy-saving centrifugal fan and shell structure thereof

Abstract

The invention discloses an energy-saving centrifugal fan and a shell structure thereof, and belongs to the technical field of centrifugal fans, the energy-saving centrifugal fan comprises a fan body, one side of a fixing frame is connected with a positioning mechanism used for positioning a first dustproof net, and the other side of the fixing frame is connected with a fixing mechanism used for limiting the first dustproof net; the top end of the fixing frame is connected with a sliding mechanism, and the bottom of the sliding block is connected with a pulling mechanism. According to the invention, single-side rapid positioning and unlocking of the first dustproof net are realized through the positioning mechanism, and the technical contradiction that a traditional dustproof cover needs to be stopped during maintenance is solved; a fixing shaft on the other side of the first dustproof net is stably matched with a second groove through a fixing mechanism, so that the operation stability is ensured; the second dustproof net is driven by the sliding mechanism to slide to the air inlet along the sliding groove, the continuous dustproof function is maintained when the first dustproof net is disassembled, and equipment shutdown is avoided. Synchronous unlocking of the sliding block is achieved through the pulling mechanism, the operation process is simplified, and the maintenance efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of centrifugal fan, and particularly relates to an energy-saving centrifugal fan and a shell structure thereof. BACKGROUND

[0002] The energy-saving centrifugal fan is a centrifugal fan which reduces energy consumption under the premise of ensuring air volume and air pressure by adopting a high-efficiency motor, optimizing impeller design and frequency conversion control technology, and realizes energy saving by reducing mechanical loss and improving aerodynamic efficiency, and is widely applied to the fields of industrial ventilation, air conditioning systems and the like.

[0003] In the technical scheme of the existing centrifugal fan, in order to prevent dust, sundries, insects and the like from invading the inside of the fan through the air inlet to cause abrasion, corrosion or blockage and the like, a dust cover structure design of adding a metal mesh cover at the air inlet is usually adopted, which can achieve basic dust prevention and protection by physical interception and effectively prolong the service life of the equipment, but in the actual application process, there is a certain inconvenience in maintenance, because the dust cover needs to be regularly disassembled and cleaned or replaced due to the attachment of dust or sundries after being used for a period of time, and in this maintenance process, the air inlet will temporarily lose the dust protection, and in order to protect the safe operation of the equipment, the centrifugal fan must be stopped until the dust cover is reinstalled in place, which not only increases the equipment downtime and reduces the use continuity, but also may cause additional loss to the fan itself due to frequent start and stop, forming a technical contradiction of protection preventing protection, which is a technical pain point to be solved in the dust prevention structure design of the existing centrifugal fan.

[0004] Therefore, the application provides an energy-saving centrifugal fan and a shell structure thereof. SUMMARY

[0005] The application aims to overcome the defects of the prior art and provide an energy-saving centrifugal fan and a shell structure thereof.

[0006] The technical scheme adopted to solve the above technical problems is as follows: an energy-saving centrifugal fan, comprising a fan main body, wherein the front end of the fan main body is provided with an air inlet, and the front end of the fan main body is fixedly connected with a fixed frame in the shape of a quadrilateral, and the air inlet is located in the fixed frame; a first dust screen is placed at the front end of the fixed frame, a positioning mechanism for positioning the first dust screen is connected to one side of the fixed frame, and a fixing mechanism for limiting the first dust screen is connected to the other side of the fixed frame; a sliding mechanism is connected to the top end of the fixed frame, a second dust screen is installed at the top end of the sliding mechanism, and the sliding mechanism is used to move the second dust screen; The bottom of the fixed frame is slidably connected with two sliding blocks, the bottom end of the sliding mechanism penetrates through the fixed frame and corresponds to the sliding blocks, and the bottom of the sliding blocks is connected with a pulling mechanism for unlocking.

[0007] Further, the fan body is internally provided with an impeller for energy conversion, the impeller corresponds to the air inlet, and the fixed frame is in contact with the first dust screen.

[0008] Through the above technical scheme, energy-saving operation is realized through high-efficiency energy conversion; the impeller rotates under the drive of the motor, converts the airflow sucked by the air inlet into wind pressure output, the optimized design reduces mechanical loss and improves pneumatic efficiency, cooperates with the interception of the first dust screen, prevents external impurities from entering while ensuring ventilation efficiency, prolongs the service life of the equipment and maintains the energy-saving characteristics.

[0009] Further, the positioning mechanism comprises a first fixed seat fixedly connected to one side of the fixed frame, a first recess is formed in the top of the first fixed seat and the top end is arc-shaped, a rotating shaft is rotatably connected to one side of the first dust screen, the rotating shaft is located in the first recess, two sleeves are fixedly connected to the other side of the first fixed seat, a fixed block penetrating through the first fixed seat is slidably connected in each sleeve, the end of each fixed block is inclined and located above the rotating shaft, a group of positioning shafts are slidably connected between each fixed block and each sleeve, two positioning shafts are arranged in each group, a first spring is sleeved on the outside of each positioning shaft, and the two ends of the first spring are fixedly connected to the other end of the fixed block and the inside of the sleeve, respectively, and a handle is fixedly connected between the two fixed blocks.

[0010] Through the above technical scheme, the positioning mechanism realizes one-side quick positioning of the first dust screen through cooperation of the fixed block and the rotating shaft; one side of the first dust screen is pressed against the fixed block through the rotating shaft and is clamped into the first recess, in this process, the fixed block is in contact with the rotating shaft to compress the first spring and automatically retract, and under the action of the first spring, the fixed block extends above the rotating shaft to form stable one-side fixing, when disassembling, the fixed block can be retracted by pulling the handle to realize one-side quick unlocking and simplify the maintenance operation steps.

[0011] Further, the fixing mechanism comprises a second fixed seat fixedly connected to the other side of the fixed frame, a second recess is formed in one side of the top of the second fixed seat, and a fixed shaft is fixedly connected to the other side of the first dust screen, and the fixed shaft is located in the second recess.

[0012] The fixing mechanism is used for fixing the other side of the first dustproof net through cooperation of the second groove and the fixing shaft; the fixing shaft of the other side of the first dustproof net is directly inserted into the second groove to form stable support and together with the positioning mechanism forms a double-side fixing structure; the fixing shaft is fixed first and then the rotating shaft is fixed, so that the first dustproof net is kept stable during operation of the fan and displacement or falling caused by vibration or air flow impact is avoided; when the first dustproof net needs to be disassembled, the handle is pulled to unlock the rotating shaft first, and then the first dustproof net is deflected around the fixing shaft until the fixing shaft can be taken out of the second groove, so that quick unlocking is realized.

[0013] Further, the sliding mechanism comprises a sliding groove opened in the inside of the top end of the fixed frame, a sliding plate for plugging is slidably connected in the sliding groove, the sliding plate is in contact with the sliding groove, the second dustproof net is installed on the top of the sliding plate, and the bottom of the sliding plate is fixedly connected with two sliding shafts, the two sliding shafts pass through the bottom end of the fixed frame and are in contact with the two sliding blocks respectively and correspondingly.

[0014] Through the above technical scheme, the sliding mechanism is used for moving the second dustproof net by the sliding groove; when the first dustproof net needs to be disassembled, the pull rod is pulled downward to drive the sliding block to be separated from the sliding shaft, and then the second dustproof net automatically slides downward under the action of its own gravity, at this time, the sliding plate slides in the sliding groove to drive the second dustproof net to move to the air inlet position, before the first dustproof net is disassembled, the second dustproof net moves to the air inlet position to maintain continuous dustproof function, and then the first dustproof net is disassembled to realize disassembly of the first dustproof net without stopping the machine.

[0015] Further, the top of the fixed frame is fixedly connected with a limiting frame for limiting, the second dustproof net is located in the limiting frame, two elastic rubber strips are installed in the inside of the top end of the limiting frame and are in contact with the front and rear ends of the second dustproof net respectively.

[0016] Through the above technical scheme, the limiting frame and the elastic rubber strips are used for precise limiting and sealing of the second dustproof net; the limiting frame surrounds the second dustproof net, the rubber strips are in close contact with the front and rear ends of the dustproof net through elastic deformation to form a dynamic sealing effect, which not only ensures stable movement of the dustproof net during sliding but also prevents dust from invading from the edge gap to improve dustproof reliability.

[0017] Further, the pulling mechanism comprises two groups of first supports fixedly connected to the bottom of the fixed frame, two first supports are arranged in each group, the first supports in each group correspond to the sliding blocks respectively, a fixed rod is fixedly connected to each first support, two sliding blocks are fixedly connected to the two ends of each sliding block, each fixed rod is in sliding connection with the two sliding blocks, a second spring is sleeved outside each fixed rod, the two ends of the second spring are fixedly connected to the sliding block and the first support respectively, a connecting rod is rotatably connected to the bottom end of each sliding block through a rotating shaft, and the other ends of the two connecting rods are rotatably connected to each other and connected to a pull rod.

[0018] Through the above technical scheme, the pulling mechanism realizes the synchronous unlocking of the sliding blocks through the transmission of the connecting rods; the pull rod is pulled downward, the connecting rods drive the sliding blocks to slide towards each other along the fixed rods, the second springs are compressed and separated from the sliding shafts, thereby releasing the sliding shafts, allowing the sliding plate to move downward freely, and the unlocking process only needs a single operation to complete the linkage unlocking of the double sliding blocks, simplifying the maintenance operation process and improving the maintenance efficiency.

[0019] A shell structure for the energy-saving centrifugal fan, comprising a shell main body fixed to the outer side of the fan main body, a motor corresponding to the impeller is installed at the rear end of the shell main body, a support seat standing on the ground is installed at the bottom end of the shell main body, and an air outlet is formed on one side of the shell main body.

[0020] Through the above technical scheme, the shell main body realizes stable operation and efficient exhaust through the design of the support seat and the air outlet; the motor at the rear end of the shell main body drives the impeller to rotate, the support seat at the bottom end ensures that the equipment is firmly standing on the ground, the air outlet is connected with the external exhaust system, the airflow is smoothly discharged, and the overall structure design ensures the stability of the equipment while optimizing the airflow path, improving the ventilation efficiency and maintaining the energy-saving characteristics.

[0021] The beneficial effects of the present application are as follows: (1) The present application realizes the one-side quick positioning and unlocking of the first dust screen through the positioning mechanism, solves the technical contradiction that the traditional dust cover maintenance needs to be stopped; the stable cooperation between the other side fixing shaft of the first dust screen and the second groove is realized through the fixing mechanism, and the running stability is ensured; (2) The present application drives the second dust screen to slide along the sliding groove to the air inlet position through the sliding mechanism, maintains the continuous dustproof function when the first dust screen is disassembled, avoids the equipment stop; the synchronous unlocking of the sliding blocks is realized through the pulling mechanism, the operation process is simplified and the maintenance efficiency is improved; (3) The present application enhances the dustproof reliability and prevents dust from invading from the edge through the dynamic sealing design of the limiting frame and the elastic rubber strip, finally achieves the composite technical effects of prolonging the service life of the equipment, improving the use continuity and reducing the loss of frequent start and stop. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 This is a first-view structural diagram of the present invention; Figure 2 This is a second-view cross-sectional structural diagram of the present invention; Figure 3 yes Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a third-view cross-sectional structural diagram of the present invention; Figure 5 yes Figure 4 A magnified view of a section at point B in the middle; Figure 6 This is a fourth-view cross-sectional structural diagram of the present invention; Figure 7 yes Figure 6 A magnified view of a section at point C; Figure 8 yes Figure 6 A magnified view of a section at point D; Figure 9 This is a fifth-view cross-sectional structural diagram of the present invention; Figure 10 This is a sixth-view cross-sectional structural diagram of the present invention.

[0023] Reference numerals in the attached drawings: 1. Fan body; 2. Air inlet; 3. Fixing frame; 4. First dustproof net; 5. Positioning mechanism; 501. First fixing seat; 502. First groove; 503. Rotating shaft; 504. Sleeve; 505. Fixing block; 506. Positioning shaft; 507. First spring; 508. Handle; 6. Fixing mechanism; 601. Second fixing seat; 602. Second groove; 603. Fixing shaft; 7. Sliding mechanism; 701. Slide groove; 702. Sliding plate; 703. Sliding shaft; 704. Limiting frame; 705. Rubber strip; 8. Second dustproof net; 9. Sliding block; 10. Pulling mechanism; 1001. First bracket; 1002. Fixed rod; 1003. Slider; 1004. Second spring; 1005. Connecting rod; 1006. Pull rod; 11. Impeller; 12. Shell body; 13. Motor; 14. Support base; 15. Air outlet. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] like Figures 1-10The energy-saving centrifugal fan of the embodiment comprises a fan main body 1, an air inlet 2 is formed at the front end of the fan main body 1, a fixed frame 3 in quadrilateral shape is fixedly connected to the front end of the fan main body 1, the air inlet 2 is located in the fixed frame 3, a first dustproof net 4 is placed at the front end of the fixed frame 3, a positioning mechanism 5 for positioning the first dustproof net 4 is connected to one side of the fixed frame 3, the positioning mechanism 5 comprises a first fixed seat 501 fixedly connected to one side of the fixed frame 3, a first recess 502 is formed at the top of the first fixed seat 501 and the top end is arc-shaped, a rotating shaft 503 is rotatably connected to one side of the first dustproof net 4, the rotating shaft 503 is located in the first recess 502, two sleeves 504 are fixedly connected to the other side of the first fixed seat 501, a fixed block 505 penetrating through the first fixed seat 501 is slidingly connected in the inside of each sleeve 504, the end of each fixed block 505 is inclined and located above the rotating shaft 503, a group of positioning shafts 506 are slidingly connected between each fixed block 505 and each sleeve 504, two positioning shafts 506 are arranged in each group, a first spring 507 is sleeved outside each positioning shaft 506, the other end of the first spring 507 is fixedly connected to the other end of the fixed block 505 and the inside of the sleeve 504, a handle 508 is fixedly connected between the two fixed blocks 505, the positioning mechanism 5 is used for achieving one-side quick positioning of the first dustproof net 4 through cooperation of the fixed block 505 and the rotating shaft 503, one side of the first dustproof net 4 is pressed against the fixed block 505 through the rotating shaft 503 and clamped into the first recess 502, in this process, the fixed block 505 is in contact with the rotating shaft 503 to compress the first spring 507 and automatically retract, and the fixed block 505 is extended above the rotating shaft 503 under the action of the first spring 507 to form stable one-side fixing, when disassembling, the fixed block 505 can be retracted by pulling the handle 508 to achieve one-side quick unlocking and simplify the maintenance operation steps.

[0026] Reference Figures 4-5The other side of the fixed frame 3 is connected with a fixing mechanism 6 for limiting the first dust screen 4, the fixing mechanism 6 comprises a second fixing seat 601 fixedly connected to the other side of the fixed frame 3, a second groove 602 is formed in one side of the top of the second fixing seat 601, and a fixing shaft 603 is fixedly connected to the other side of the first dust screen 4 and located in the second groove 602, the fixing mechanism 6 is used for fixing the other side of the first dust screen 4 through cooperation of the second groove 602 and the fixing shaft 603; the fixing shaft 603 of the other side of the first dust screen 4 is directly inserted into the second groove 602 to form stable support, and cooperates with the positioning mechanism 5 to form a double-side fixing structure, and the fixing shaft 603 is fixed first, and then the rotating shaft 503 is fixed, so that the first dust screen 4 can be kept stable during the operation of the fan, and displacement or falling caused by vibration or air flow impact is avoided; when the first dust screen 4 needs to be disassembled, the rotating shaft 503 is unlocked by pulling the handle 508 first, and then the first dust screen 4 is deflected around the fixing shaft 603 until the fixing shaft 603 can be taken out of the second groove 602, and quick unlocking is completed.

[0027] Reference Figures 6-7 The top end of the fixed frame 3 is connected with a sliding mechanism 7, the sliding mechanism 7 is installed with the second dust screen 8 at the top end, the sliding mechanism 7 is used for moving the second dust screen 8, the sliding mechanism 7 comprises a sliding groove 701 formed in the inside of the top end of the fixed frame 3, a sliding plate 702 for plugging is slidably connected in the sliding groove 701, the sliding plate 702 is in contact with the sliding groove 701, the second dust screen 8 is installed on the top of the sliding plate 702, and the bottom of the sliding plate 702 is fixedly connected with two sliding shafts 703, the two sliding shafts 703 pass through the bottom end of the fixed frame 3 and are in contact with the two sliding blocks 9 respectively and correspondingly, the sliding mechanism 7 is used for moving the second dust screen 8 through the sliding groove 701; when the first dust screen 4 needs to be disassembled, the sliding block 9 is separated from the sliding shaft 703 by pulling down the pull rod 1006, and then the second dust screen 8 automatically slides downward under the action of its own gravity, at this time, the sliding plate 702 slides in the sliding groove 701, drives the second dust screen 8 to move to the air inlet 2, before the first dust screen 4 is disassembled, the second dust screen 8 moves to the air inlet 2 to maintain continuous dust prevention function, and then the first dust screen 4 is disassembled, so that the first dust screen 4 can be disassembled without stopping.

[0028] Reference Figures 6-7The top of the fixed frame 3 is fixedly connected with a limiting frame 704 for limiting, the second dust screen 8 is located in the limiting frame 704, the inside of the top end of the limiting frame 704 is provided with two elastic rubber strips 705 and is in contact with the front end and the rear end of the second dust screen 8 respectively, and the limiting frame 704 and the elastic rubber strips 705 cooperate to realize accurate limiting and sealing of the second dust screen 8; the limiting frame 704 surrounds the second dust screen 8, the rubber strips 705 are in close contact with the front end and the rear end of the dust screen through elastic deformation, a dynamic sealing effect is formed, the stable movement of the dust screen in the sliding process is ensured, dust intrusion from the edge gap is prevented, and dustproof reliability is improved.

[0029] Reference Figures 6-8 The bottom of the fixed frame 3 is slidably connected with two sliding blocks 9, the sliding mechanism 7 penetrates through the fixed frame 3 and corresponds to the sliding blocks 9, the bottom of each sliding block 9 is connected with a pulling mechanism 10 for unlocking, the pulling mechanism 10 comprises two groups of first supports 1001 fixedly connected to the bottom of the fixed frame 3, each group is provided with two first supports 1001, each group of the first supports 1001 corresponds to each group of the sliding blocks 9, each first support 1001 is fixedly connected with a fixed rod 1002, both ends of each sliding block 9 are fixedly connected with two sliding blocks 1003, each fixed rod 1002 is slidably connected with each two sliding blocks 1003, the outside of each fixed rod 1002 is sleeved with a second spring 1004, both ends of the second spring 1004 are fixedly connected with one side of the sliding block 1003 and the first support 1001 respectively, the bottom end of each sliding block 9 is rotatably connected with a connecting rod 1005 through a rotating shaft, the other ends of the two connecting rods 1005 are rotatably connected with each other and connected with a pull rod 1006, the pulling mechanism 10 is used for realizing synchronous unlocking of the sliding blocks 9 through the transmission of the connecting rods 1005; the pull rod 1006 is pulled downward, the connecting rods 1005 drive the sliding blocks 9 to slide towards each other along the fixed rods 1002, the second springs 1004 are compressed and separated from the sliding shaft 703, so that the sliding shaft 703 is released, the sliding plate 702 can move downward freely, and the unlocking process can be completed through only one-time operation of the linkage unlocking of the two sliding blocks 9, the maintenance operation process is simplified, and the maintenance efficiency is improved.

[0030] Reference Figures 1-10 The inside of the fan body 1 is provided with an impeller 11 for energy conversion, the impeller 11 corresponds to the air inlet 2, the fixed frame 3 is in contact with the first dust screen 4, and energy-saving operation is realized through efficient energy conversion; the impeller 11 rotates under the drive of the motor 13, converts the airflow sucked into the air inlet 2 into wind pressure output, the optimized design reduces mechanical loss and improves pneumatic efficiency, cooperates with the interception of the first dust screen 4, prevents external impurities from invading while ensuring ventilation efficiency, prolongs the service life of the equipment and maintains the energy-saving characteristics.

[0031] Reference Figures 1-10The application further provides a shell structure for the energy-saving centrifugal fan, which comprises a shell body 12 fixed to the outer side of the fan body 1, a motor 13 corresponding to the impeller 11 is installed at the rear end of the shell body 12, a support base 14 standing on the ground is installed at the bottom end of the shell body 12, an air outlet 15 is formed in one side of the shell body 12, and the shell body 12 is designed to realize stable operation and efficient air exhaust through the support base 14 and the air outlet 15; the motor 13 at the rear end of the shell body 12 drives the impeller 11 to rotate, the support base 14 at the bottom end ensures that the equipment is stably standing on the ground, the air outlet 15 is connected with an external air exhaust system to realize smooth air exhaust, and the overall structure design ensures the stability of the equipment, optimizes the air flow path, improves the ventilation efficiency and maintains the energy-saving characteristics.

[0032] The working principle of the embodiment is as follows, when the first dust screen 4 is installed, the fixed shaft 603 is first inserted into the second groove 602 to be fixed, and then the first dust screen 4 is deflected, the rotating shaft 503 is clamped into the first groove 502, and the fixed block 505 is locked to form fixation under the action of the first spring 507; when maintenance is needed, the pull rod 1006 is pulled downward, the sliding block 9 is driven to slide through the connecting rod 1005 and is separated from the sliding shaft 703, at this time, the sliding plate 702 slides along the sliding groove 701 to drive the second dust screen 8 to move to the air inlet 2 position, in this process, the dustproof function is maintained through the dynamic sealing of the limiting frame 704 and the elastic rubber strip 705, then the handle 508 is pulled to make the fixed block 505 contract and unlock the rotating shaft 503, the first dust screen 4 is deflected around the fixed shaft 603, and the disassembly is completed; when the first dust screen 4 is disassembled for cleaning or replacement, the second dust screen 8 continuously intercepts dust to avoid shutdown; after the maintenance is completed, the first dust screen 4 is reinstalled, the sliding plate 702 drives the second dust screen 8 to slide back to the original position through the sliding shaft 703, and the initial state is restored, the whole process does not need to stop the operation of the fan body 1, the technical contradiction that the traditional dust cover needs to be stopped for maintenance is solved, and the use continuity and equipment life are improved.

[0033] The above merely describes a preferred embodiment of the application, but should not be used to limit the protection scope of the application.

Claims

1. An energy-saving centrifugal fan, comprising a fan body (1), wherein an air inlet (2) is provided at the front end of the fan body (1), characterized in that: The front end of the main body (1) of the fan is fixedly connected to a quadrilateral frame (3), and the air inlet (2) is located inside the frame (3); The front end of the fixed frame (3) is provided with a first dustproof net (4), and a positioning mechanism (5) for positioning the first dustproof net (4) is connected to one side of the fixed frame (3), and a fixing mechanism (6) for limiting the first dustproof net (4) is connected to the other side of the fixed frame (3). The top of the fixed frame (3) is connected to a sliding mechanism (7), and a second dustproof net (8) is installed on the top of the sliding mechanism (7). The sliding mechanism (7) is used to move the second dustproof net (8). The bottom of the fixed frame (3) is slidably connected to two sliding blocks (9). The bottom end of the sliding mechanism (7) passes through the fixed frame (3) and corresponds to the sliding block (9). The bottom of the sliding block (9) is connected to a pulling mechanism (10) for unlocking.

2. The energy-saving centrifugal fan according to claim 1, characterized in that: The fan body (1) is equipped with an impeller (11) for energy conversion. The impeller (11) corresponds to the air inlet (2), and the fixed frame (3) contacts and abuts against the first dustproof net (4).

3. The energy-saving centrifugal fan according to claim 1, characterized in that: The positioning mechanism (5) includes a first fixed seat (501) fixedly connected to one side of the fixed frame (3). The top of the first fixed seat (501) is provided with a first groove (502) and one end of the top is arc-shaped. A rotating shaft (503) is rotatably connected to one side of the first dustproof net (4). The rotating shaft (503) is located in the first groove (502). Two sleeves (504) are fixedly connected to the other side of the first fixed seat (501). Each sleeve (504) has a fixed part that passes through the first fixed seat (501) and is slidably connected inside. The two fixed blocks (505) each have an inclined surface at one end and are located above the rotating shaft (503). Each fixed block (505) and each sleeve (504) are slidably connected to a set of positioning shafts (506). Each set has two shafts. Each positioning shaft (506) is fitted with a first spring (507). The two ends of the first spring (507) are fixedly connected to the other end of the fixed block (505) and the inside of the sleeve (504), respectively. A handle (508) is fixedly connected between the two fixed blocks (505).

4. The energy-saving centrifugal fan according to claim 1, characterized in that: The fixing mechanism (6) includes a second fixing seat (601) fixedly connected to the other side of the fixing frame (3). A second groove (602) is provided on one side of the top of the second fixing seat (601). A fixing shaft (603) is fixedly connected to the other side of the first dustproof net (4). The fixing shaft (603) is located in the second groove (602).

5. An energy-saving centrifugal fan according to claim 1, characterized in that: The sliding mechanism (7) includes a groove (701) opened inside the top of the fixed frame (3). A sliding plate (702) for sealing is slidably connected in the groove (701). The sliding plate (702) contacts and abuts against the groove (701). The second dustproof net (8) is installed on the top of the sliding plate (702). Two sliding shafts (703) are fixedly connected to the bottom of the sliding plate (702). The two sliding shafts (703) pass through the bottom of the fixed frame (3) and contact and abut against the two sliding blocks (9) respectively.

6. The energy-saving centrifugal fan according to claim 1, characterized in that: The top of the fixed frame (3) is fixedly connected to a limiting frame (704) for limiting position. The second dustproof net (8) is located inside the limiting frame (704). Two elastic rubber strips (705) are installed inside the top of the limiting frame (704) and respectively contact and abut against the front and rear ends of the second dustproof net (8).

7. An energy-saving centrifugal fan according to claim 1, characterized in that: The pulling mechanism (10) includes two sets of first brackets (1001) fixedly connected to the bottom of the fixed frame (3). Each set contains two brackets. Each pair of first brackets (1001) corresponds to each set of sliding blocks (9). Each first bracket (1001) is fixedly connected to a fixed rod (1002). Each sliding block (9) has two sliders (1003) fixedly connected to both ends. Each pair of sliders (1003) is slidably connected to each fixed rod (1002). Each fixed rod (1002) is fitted with a second spring (1004). The two ends of the second spring (1004) are fixedly connected to one side of the slider (1003) and the first bracket (1001), respectively. The bottom end of each sliding block (9) is rotatably connected to a connecting rod (1005) through a rotating shaft. The other ends of the two connecting rods (1005) are rotatably connected to each other and connected to a pull rod (1006).

8. A housing structure for the energy-saving centrifugal fan of claim 1, comprising a housing body (12) fixed to the outside of the fan body (1), characterized in that: A motor (13) is installed at the rear end of the shell body (12), a support base (14) is installed at the bottom end of the shell body (12) and an air outlet (15) is opened on one side of the shell body (12).

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