Volute-free centrifugal fan

Abstract

The volute-free centrifugal fan comprises a supporting frame, a supporting frame is fixedly connected to the side wall of the supporting frame, an air inlet used for air inflow is formed in the side wall of the supporting frame, two first semicircular plates are fixedly connected to the top of the supporting frame, and a motor is installed between the tops of the two first semicircular plates. The output end of the motor is fixedly connected with a first connecting block, one end of the first connecting block is provided with a second connecting block, one end of the second connecting block is fixedly provided with a rotating impeller, and a replacement mechanism used for disassembling and replacing the rotating impeller is arranged between the first connecting block and the second connecting block. According to the device, the rotating impeller can be conveniently disassembled and efficiently assembled without any tool, the maintenance and replacement time is greatly shortened, meanwhile, the adaptability of the device under various air volume or pressure requirements is improved, and the flexibility and practicability of the device in the industrial fan are enhanced.

Description

Technical Field

[0001] This utility model relates to the field of vehicle frame assembly technology, specifically to a centrifugal fan without a volute. Background Technology

[0002] A volute-less centrifugal fan is a simplified type of fan equipment that eliminates the volute component found in traditional centrifugal fans. It primarily consists of an impeller, a motor support structure, and an air outlet guide device. This fan achieves centrifugal gas discharge through the high-speed rotation of the impeller, making it suitable for applications where airflow direction is not critical, installation space is limited, or a simplified ventilation system structure is required. The volute-less design not only reduces manufacturing costs and weight but also decreases duct resistance, contributing to improved ventilation efficiency and operational stability. It is widely used in air conditioning systems, fume hoods, and industrial cooling systems.

[0003] The centrifugal fan without a volute, as disclosed in authorization announcement number CN216477907U, includes a body, a base at the bottom of the body, a front plate fixed to the front side of the base, a motor mounted on the base, an impeller connected to the end of the motor, an air inlet on the front plate, a collector connecting the impeller and the air inlet, and diagonal bracing assemblies connecting the two sides of the base to the front plate, the diagonal bracing assemblies supporting the front plate fixed to the base. This utility model, by setting a base, fixing a front plate to the front side of the base, connecting the motor to the impeller, and connecting the impeller to the air inlet of the front plate with a collector, allows air to enter through the air inlet after the motor runs, thanks to the diagonal bracing assemblies installed between the two sides of the base and the front plate.

[0004] Although the centrifugal fan enhances the structural stability of the front plate by strengthening the connection between the front plate and the base, and by forming a triangular structure among the diagonal brace, base, and front plate, it typically uses a traditional bolt connection method to fix the impeller to the main shaft. This results in a complex structure and cumbersome assembly and disassembly processes. In particular, when it is necessary to replace the impeller with one that has different airflow or pressure characteristics for different operating conditions, the operation is not only time-consuming and labor-intensive but also requires the assistance of specialized tools, leading to low maintenance efficiency. This affects the flexibility of the equipment to adapt to various operating scenarios and makes it difficult to meet the actual needs for rapid adjustment of fan performance. Utility Model Content

[0005] The purpose of this utility model is to provide a centrifugal fan without a volute to solve the problems mentioned in the background art, such as complex structure, cumbersome assembly and disassembly process, especially when it is necessary to replace impellers with different air volume or pressure characteristics according to different working conditions, which not only consumes time and effort, but also requires professional tools, resulting in low maintenance efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a volute-less centrifugal fan, comprising a support frame, a support bracket fixedly connected to the side wall of the support frame, an air inlet for air intake on the side wall of the support frame, two first semicircular plates fixedly connected to the top of the support bracket, a motor installed between the tops of the two first semicircular plates, a first connecting block fixedly connected to the output end of the motor, a second connecting block installed at one end of the first connecting block, a rotating impeller fixedly installed at one end of the second connecting block, and a replacement mechanism for disassembling and replacing the rotating impeller provided between the first connecting block and the second connecting block.

[0007] Preferably, the replacement mechanism includes a compression ring slidably connected to the outer wall of the first connecting block, a fixing ring fixedly connected to the outer wall of the first connecting block, a push spring fixedly connected between the opposing surfaces of the compression ring and the fixing ring, the push spring being sleeved on the outer wall of the first connecting block, a slot being provided at one end of the first connecting block near the second connecting block, an insert being fixedly connected at one end of the second connecting block near the first connecting block, the inner wall of the slot being adapted to the outer wall of the insert, the outer wall of the insert being provided with four equidistant and evenly distributed limiting grooves, the inner wall of the slot being provided with four equidistant and evenly distributed ball grooves, and each of the four ball grooves containing a ball for engaging with the limiting groove.

[0008] Preferably, a cross-shaped insert is fixedly connected to one end of the second connecting block near the first connecting block, and a cross-shaped slot is provided at the bottom of the inner wall of the slot. Both the cross-shaped insert and the cross-shaped slot are cross-shaped, and the outer wall of the cross-shaped insert and the interior of the cross-shaped slot are adapted to each other.

[0009] Preferably, the tops of the two first semicircular plates are fixedly connected to the second semicircular plates by bolts, and a motor damping ring is placed between the inner walls of the first and second semicircular plates, the motor damping ring being sleeved on the outer wall of the motor.

[0010] Preferably, a support plate is fixedly connected between the inner wall of the support frame and the end closest to the motor, and a support ring is fixedly connected to the side wall of the support plate, with the second connecting block penetrating the side wall of the support ring.

[0011] Preferably, the inner wall of the ball groove is arc-shaped, and the ball will not fall out of the ball groove when it rolls in the ball groove.

[0012] Preferably, when the extrusion ring slides to the connection between the first connecting block and the second connecting block, the inner wall of the extrusion ring will simultaneously push the four balls to respectively engage with the inner walls of the four limiting grooves.

[0013] Preferably, the outer wall of the compression ring is provided with an anti-slip groove to increase the friction between the compression ring and the user's hand when the compression ring is pushed.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This replacement mechanism, through the setting of a quick-release structure, realizes the rapid disassembly and installation of the rotating impeller, significantly improving maintenance efficiency and operational convenience. The operator only needs to manually push the squeezing ring to slide it away from the first connecting block and the second connecting block, releasing the pressure on the ball bearings, and thus allowing the ball bearings to exit the limiting groove on the insert block, achieving rapid disassembly of the rotating impeller. During reinstallation, the cross-shaped insert at the front end of the insert block can precisely cooperate with the cross-shaped slot at the bottom of the slot, forming a stable and anti-slip anti-rotation structure to prevent rotational slippage and ensure transmission accuracy. When the insert block is inserted into place, under the action of the pushing spring, the squeezing ring automatically resets and presses the ball bearings, embedding them into the limiting groove, thereby completing the rapid locking of the second connecting block. This mechanism has a compact structure and is easy to operate. Without the aid of any tools, it can realize convenient disassembly and efficient assembly of the rotating impeller, which not only greatly shortens the maintenance and replacement time, but also improves the adaptability of the device under various air volume or pressure requirements, enhancing the flexibility and practicality of the device in industrial fans. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a three-dimensional rear view structural diagram of the present invention;

[0017] Figure 3 This is a three-dimensional structural diagram of the cross-shaped insert block and cross-shaped slot of this utility model;

[0018] Figure 4 This is a three-dimensional structural diagram of the replacement mechanism of this utility model.

[0019] In the diagram: 1. Support frame; 2. Support bracket; 3. Air inlet; 4. First semicircular plate; 5. Motor; 6. First connecting block; 7. Second connecting block; 8. Rotating impeller; 9. Extrusion ring; 10. Fixing ring; 11. Push spring; 12. Slot; 13. Insert block; 14. Limiting groove; 15. Ball groove; 16. Ball; 17. Cross insert block; 18. Cross slot; 19. Second semicircular plate; 20. Motor shock absorber ring; 21. Support plate; 22. Support ring. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] Example

[0024] Please see Figure 1-4 The present invention provides an embodiment of a centrifugal fan without a volute, comprising a support frame 1, a support bracket 2 fixedly connected to the side wall of the support frame 1, an air inlet 3 for air intake on the side wall of the support frame 1, two first semicircular plates 4 fixedly connected to the top of the support bracket 2, a motor 5 installed between the tops of the two first semicircular plates 4, a first connecting block 6 fixedly connected to the output end of the motor 5, a second connecting block 7 installed at one end of the first connecting block 6, a rotating impeller 8 fixedly installed at one end of the second connecting block 7, and a quick-release mechanism for disassembling and replacing the rotating impeller 8 provided between the first connecting block 6 and the second connecting block 7.

[0025] The quick-release mechanism includes a compression ring 9 slidably connected to the outer wall of the first connecting block 6, a fixing ring 10 fixedly connected to the outer wall of the first connecting block 6, a push spring 11 fixedly connected between the opposing surfaces of the compression ring 9 and the fixing ring 10, the push spring 11 being sleeved on the outer wall of the first connecting block 6, a slot 12 being provided at one end of the first connecting block 6 near the second connecting block 7, and an insert block 13 being fixedly connected at one end of the second connecting block 7 near the first connecting block 6, the inner wall of the slot 12 and the outer wall of the insert block 13 being adapted to each other, the outer wall of the insert block 13 having four equidistant and evenly distributed limiting grooves 14, and the inner wall of the slot 12 having four equidistant and evenly distributed ball grooves 15, the inner wall of the four ball grooves 15 being... Each part is equipped with a ball bearing 16 for engaging with the limiting groove 14. The inner wall of the ball bearing groove 15 is arc-shaped, and the ball bearing 16 will not roll out of the ball bearing groove 15 when it rolls in the ball bearing groove 15. When the extrusion ring 9 slides to the connection between the first connecting block 6 and the second connecting block 7, the inner wall of the extrusion ring 9 will push the four balls bearing 16 to engage with the inner walls of the four limiting grooves 14 respectively. A cross-shaped insert block 17 is fixedly connected to one end of the second connecting block 7 near the first connecting block 6. A cross-shaped slot 18 is provided at the bottom of the inner wall of the slot 12. The cross-shaped insert block 17 and the cross-shaped slot 18 are both cross-shaped. The outer wall of the cross-shaped insert block 17 and the interior of the cross-shaped slot 18 are adapted to each other.

[0026] When it is necessary to disassemble the rotating impeller 8, the operator first manually pushes the compression ring 9 in the quick-release mechanism to slide towards the push spring 11, while squeezing the push spring 11 and overcoming its elasticity, so that the compression ring 9 moves out from the connection between the first connecting block 6 and the second connecting block 7. As the compression ring 9 leaves, the clamping force originally applied to the ball 16 disappears, and the ball 16 exits from the limiting groove 14 on the insert block 13, thereby releasing the limiting engagement state of the second connecting block 7. At this time, the operator can directly pick up the rotating impeller 8 for disassembly. The movement of the rotating impeller 8 will drive the second connecting block 7 and its connected insert block 13 to disengage from the slot 12. During the pulling process, the limiting groove 14 on the insert block 13 contacts the ball 16, pushing the ball 16 to slide out along the ball groove 15, realizing a smooth disengagement process, and thus completing the disassembly operation of the rotating impeller 8.

[0027] When a new rotating impeller 8 needs to be reinstalled, the operator pushes the compression ring 9 and then slowly pushes the rotating impeller 8 into the slot 12 along the axial direction. This causes the second connecting block 7 connected to the side wall of the rotating impeller 8 to drive the insert block 13 to gradually insert into the slot 12. At the same time, the cross insert block 17 fixed at the front end of the insert block 13 is precisely inserted into the cross slot 18 at the bottom of the slot 12, forming a stable, non-slip, and anti-rotation structure. This effectively avoids phenomena such as rotation slippage or transmission deviation when the motor 5 is driven. As the insert block 13 continues to go deeper, the preset limiting groove 14 on its outer wall will align with the ball groove 15 on the inner wall of the slot 12. At this time, the operator releases the compression ring 9. Under the rebound action of the pushing spring 11, the compression ring 9 automatically slides back to the connection between the first connecting block 6 and the second connecting block 7, and at the same time presses the four balls 16, so that they can be smoothly embedded into the limiting groove 14 on the outer wall of the insert block 13. This achieves quick limiting and fixing of the second connecting block 7, and thus completes the installation process of the rotating impeller 8.

[0028] The replacement mechanism, by setting a quick-release structure, enables the rapid disassembly and installation of the rotating impeller 8, which significantly improves maintenance efficiency and ease of operation. The operator only needs to manually push the compression ring 9 to slide it away from the first connecting block 6 and the second connecting block 7, release the pressure on the ball 16, and then allow the ball 16 to exit the limiting groove 14 on the insert block 13, thereby achieving rapid disengagement of the rotating impeller 8. During reinstallation, the cross-shaped insert 17 at the front end of the insert 13 can precisely engage with the cross-shaped slot 18 at the bottom of the slot 12, forming a stable, non-slip, and anti-rotation structure to prevent rotational slippage and ensure transmission accuracy. When the insert 13 is inserted into place, the compression ring 9 automatically resets and presses the ball 16 under the action of the push spring 11, so that it is embedded in the limiting groove 14, thereby completing the quick locking of the second connecting block 7. This mechanism is compact and easy to operate. It can achieve convenient disassembly and efficient assembly of the rotating impeller 8 without the aid of any tools. It not only greatly shortens the maintenance and replacement time, but also improves the adaptability of the device under various air volume or pressure requirements, and enhances the flexibility and practicality of the device in industrial fans.

[0029] The tops of the two first semicircular plates 4 are fixedly connected to the second semicircular plate 19 by bolts. A motor damping ring 20 is placed between the inner walls of the first semicircular plate 4 and the second semicircular plate 19. The motor damping ring 20 is sleeved on the outer wall of the motor 5.

[0030] The first semicircular plate 4 and the second semicircular plate 19 are fixed together by bolts, thereby clamping and fixing the motor 5. At the same time, a motor damping ring 20 is sleeved on the outer wall of the motor 5, so that the outer wall of the motor damping ring 20 does not directly contact the first semicircular plate 4 and the second semicircular plate 19. Thus, the motor damping ring 20 can absorb the vibration generated by the operation of the motor 5, improve stability and lifespan, and also reduce noise.

[0031] A support plate 21 is fixedly connected to the inner wall of the support frame 1 near the motor 5. A support ring 22 is fixedly connected to the side wall of the support plate 21. The second connecting block 7 passes through the side wall of the support ring 22.

[0032] In order to support the connecting structure and maintain the coaxiality and stability of the rotating impeller 8, the support plate 21 supports the support ring 22, and then the support ring 22 supports the second connecting block 7, which plays a role in radial limiting and support when the motor 5 drives the rotating impeller 8 to rotate.

[0033] The outer wall of the compression ring 9 is provided with an anti-slip groove to increase the friction between the compression ring 9 and the user's hand when the compression ring 9 is pushed, thereby increasing the friction between the compression ring 9 and the hand, preventing slippage, and improving the ease of operation.

[0034] Work steps

[0035] In use, when the rotating impeller 8 needs to be disassembled, the operator first manually pushes the compression ring 9 in the quick-release mechanism to slide towards the push spring 11, while squeezing the push spring 11 and overcoming its elasticity, so that the compression ring 9 moves out from the connection between the first connecting block 6 and the second connecting block 7. As the compression ring 9 leaves, the clamping force originally applied to the ball 16 disappears, and the ball 16 exits from the limiting groove 14 on the insert block 13, thereby releasing the limiting engagement state of the second connecting block 7. At this time, the operator can directly pick up the rotating impeller 8 for disassembly. The movement of the rotating impeller 8 will drive the second connecting block 7 and its connected insert block 13 to disengage from the slot 12. During the pulling process, the limiting groove 14 on the insert block 13 contacts the ball 16, pushing the ball 16 to slide out along the ball groove 15, realizing a smooth disassembly process, and thus completing the disassembly operation of the rotating impeller 8.

[0036] When a new rotating impeller 8 needs to be reinstalled, the operator pushes the compression ring 9 and then slowly pushes the rotating impeller 8 into the slot 12 along the axial direction. This causes the second connecting block 7 connected to the side wall of the rotating impeller 8 to drive the insert block 13 to gradually insert into the slot 12. At the same time, the cross insert block 17 fixed at the front end of the insert block 13 is precisely inserted into the cross slot 18 at the bottom of the slot 12, forming a stable, non-slip, and anti-rotation structure. This effectively avoids phenomena such as rotation slippage or transmission deviation when the motor 5 is driven. As the insert block 13 continues to go deeper, the preset limiting groove 14 on its outer wall will align with the ball groove 15 on the inner wall of the slot 12. At this time, the operator releases the compression ring 9. Under the rebound action of the pushing spring 11, the compression ring 9 automatically slides back to the connection between the first connecting block 6 and the second connecting block 7, and at the same time presses the four balls 16, so that they can be smoothly embedded into the limiting groove 14 on the outer wall of the insert block 13. This achieves quick limiting and fixing of the second connecting block 7, and thus completes the installation process of the rotating impeller 8.

[0037] Through the above operating procedures, the quick-release structure can achieve convenient disassembly and efficient assembly of the rotating impeller 8 without the aid of any tools. This not only greatly shortens the maintenance and replacement time, but also improves the adaptability of the device under various air volume or pressure requirements, and enhances the flexibility and practicality of the device in industrial fans.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A centrifugal fan without a volute, characterized in that: The device includes a support frame, a support bracket fixedly connected to the side wall of the support frame, an air inlet for air intake on the side wall of the support frame, two first semi-circular plates fixedly connected to the top of the support bracket, a motor installed between the tops of the two first semi-circular plates, a first connecting block fixedly connected to the output end of the motor, a second connecting block installed at one end of the first connecting block, a rotating impeller fixedly installed at one end of the second connecting block, and a replacement mechanism for disassembling and replacing the rotating impeller provided between the first connecting block and the second connecting block. The replacement mechanism includes a compression ring slidably connected to the outer wall of the first connecting block, a fixing ring fixedly connected to the outer wall of the first connecting block, a push spring fixedly connected between the opposing surfaces of the compression ring and the fixing ring, the push spring being sleeved on the outer wall of the first connecting block, a slot being provided at one end of the first connecting block near the second connecting block, an insert being fixedly connected at one end of the second connecting block near the first connecting block, the inner wall of the slot being adapted to the outer wall of the insert, the outer wall of the insert being provided with four equidistant and evenly distributed limiting grooves, and the inner wall of the slot being provided with four equidistant and evenly distributed ball grooves, each of the four ball grooves containing a ball for engaging with the limiting groove; The second connecting block is fixedly connected to a cross-shaped insert at one end near the first connecting block. A cross-shaped slot is provided at the bottom of the inner wall of the slot. Both the cross-shaped insert and the cross-shaped slot are cross-shaped. The outer wall of the cross-shaped insert and the interior of the cross-shaped slot are adapted to each other.

2. The centrifugal fan without a volute according to claim 1, characterized in that: The tops of the two first semicircular plates are fixedly connected to the second semicircular plate by bolts. A motor damping ring is placed between the inner walls of the first and second semicircular plates and is sleeved on the outer wall of the motor.

3. The centrifugal fan without a volute according to claim 1, characterized in that: A support plate is fixedly connected to the inner wall of the support frame near the motor, and a support ring is fixedly connected to the side wall of the support plate. The second connecting block passes through the side wall of the support ring.

4. A centrifugal fan without a volute according to claim 1, characterized in that: The inner wall of the ball groove is arc-shaped, and the ball will not fall out of the ball groove when it rolls in the ball groove.

5. A centrifugal fan without a volute according to claim 1, characterized in that: When the extrusion ring slides to the connection between the first connecting block and the second connecting block, the inner wall of the extrusion ring will simultaneously push the four balls to respectively engage with the inner walls of the four limiting grooves.

6. A centrifugal fan without a volute according to claim 1, characterized in that: The outer wall of the compression ring is provided with an anti-slip groove to increase the friction between the compression ring and the user's hand when the compression ring is pushed.

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