Centrifugal fan mounting structure and centrifugal fan

Abstract

The utility model discloses a kind of centrifugal fan mounting structure and centrifugal fan, it is related to centrifugal fan technical field, the utility model includes flange barrel, flange barrel one end is fixed with locating block, flange barrel outside is sleeved with soft connection barrel, and soft connection barrel outside is sleeved with compression ring, and compression ring one end is provided with locating hole;Compression ring top is fixed with lifting seat, and lifting seat one end is penetrated with flange bolt, flange bolt one end is fixed with puncture head, flange barrel top is provided with fixed groove, and fixed groove inside is connected with nut.The utility model is equipped with locating block and locating hole, the number of locating block and locating block is same with the number of lifting seat, flange bolt and nut, and five are annular array equidistant distribution, so in assembly process, locating block enters locating block, then lifting seat and nut will be aligned;Avoid angle deviation between lifting seat and nut in assembly process to cause the phenomenon that flange bolt cannot be loaded.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal fan technology, specifically to a centrifugal fan installation structure and a centrifugal fan. Background Technology

[0002] Fans are general-purpose machines that rely on a power unit to drive the impeller to rotate, thereby achieving gas transportation or pressurization. They are widely used in industrial ventilation, building air conditioning, environmental dust removal, energy and other fields. According to their working principle, they can be divided into centrifugal, axial, and mixed-flow types. Centrifugal fans are an important category of fans. Their core working principle is to generate centrifugal force through the high-speed rotation of the impeller, which accelerates the gas and changes its flow direction within the volute, thereby achieving gas transportation or pressurization. Their typical structure usually includes components such as impeller, volute, drive motor, and support frame. They are characterized by high air pressure and stable flow rate, and are suitable for scenarios that require long-distance or high-pressure gas transportation, such as factory ventilation, boiler induced draft, and air conditioning system air supply.

[0003] In centrifugal fan installation structures, flexible joints are flexible components that connect the fan body to the pipeline or installation foundation. Their main functions include two points: First, the centrifugal fan will generate vibration during operation, and the flexibility of the flexible joint can reduce the transmission of vibration to the pipeline or installation structure, thereby reducing vibration noise and fatigue damage to the equipment and surrounding structures. Second, during the installation process, there may be dimensional deviations or the need for fine-tuning of the position. The deformability of the flexible joint can adapt to installation deviations within a certain range, simplifying the installation process.

[0004] When flexible joints are damaged due to wear, scratches, aging, etc., they need to be replaced. The flexible joint sleeve in the flexible joint is usually locked and limited by a self-drilling screw. When replacing the flexible joint sleeve, the outer ring hole of the pressure plate is on the outside, making it easy to find and screw in the screw. However, the outer ring hole of the flange is blocked by the flexible joint sleeve and the pressure plate, making it difficult to align the screw with the flange hole. This means that the outer ring of the flange needs to be re-drilled when replacing the flexible joint sleeve, which has a certain impact on the sealing performance. If it is not aligned, the threaded hole may be cut again, causing the thread to fail. If the flange is replaced at the same time, it will be wasteful. Although the flange is made of metal and can be recycled, recycling also requires reprocessing and smelting costs. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a centrifugal fan installation structure and a centrifugal fan to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an installation structure for a centrifugal fan, including a flange cylinder, a positioning block fixed at one end of the flange cylinder, a flexible joint sleeve sleeved outside the flange cylinder, and a pressure ring sleeved outside the flexible joint sleeve, with a positioning hole at one end of the pressure ring; a lifting seat fixed to the top of the pressure ring, with flange bolts penetrating one end of each lifting seat, a piercing head fixed to one end of each flange bolt, and a fixing groove opened at the top of the flange cylinder, with a nut connected inside the fixing groove.

[0007] By adopting the above technical solution, the positioning block and positioning hole are used to achieve precise positioning of the pressure ring and the flange cylinder. With the support and guidance of the lifting seat for the flange bolts, the piercing head can smoothly penetrate the flexible joint cylinder and connect with the nut in the fixing groove, forming a stable installation structure. This not only ensures the reliable fixing of the flexible joint cylinder, but also facilitates subsequent disassembly and replacement, solving the problems of difficult alignment and easy damage to the threads when replacing traditional flexible joints.

[0008] Furthermore, the positioning block is detached from the positioning hole.

[0009] By adopting the above technical solution, the pressure ring and flange can be detachably assembled, which facilitates quick positioning during installation. At the same time, the pressure ring and flange can be easily separated when the flexible coupling is replaced, improving the ease of operation.

[0010] Furthermore, the flange cylinder end face is provided with multiple round holes, and multiple positioning blocks, positioning holes, lifting seats, flange bolts, piercing heads, nuts and fixing grooves are provided.

[0011] By adopting the above technical solution, multiple components are arranged in a ring array, which makes the soft connector uniformly stressed and the connection more stable.

[0012] Furthermore, the multiple raised seats are staggered with the multiple circular holes on the flange end face, and the multiple raised seats correspond to the multiple positioning blocks and positioning holes.

[0013] By adopting the above technical solutions, the staggered distribution avoids the raised seats from obstructing the installation of connecting bolts between the flange cylinder and the volute and the pipe, ensuring the compatibility of the installation structure with the fan body; the raised seats correspond to the positioning blocks and positioning holes, ensuring that the flange bolts and nuts are accurately aligned after positioning.

[0014] Furthermore, the puncture head is conical in shape and is machined from the end of the flange bolt.

[0015] By adopting the above technical solution, the conical piercing head can easily penetrate the flexible connector, and the turning shape avoids the cutting edge structure of traditional self-tapping screws. It will not damage the internal thread of the nut, ensure the stability of the threaded connection, and can be reused multiple times, reducing resource waste.

[0016] Furthermore, the flexible sleeve is detachably connected to the flange sleeve, and the pressure ring is detachably connected to the flexible sleeve.

[0017] By adopting the above technical solution, the flexible connector can be disassembled and replaced independently. When the flexible connector is worn or damaged due to aging, there is no need to replace other parts such as the flange, thereby reducing maintenance costs and extending the service life of the equipment.

[0018] Furthermore, the corners of both the flange cylinder and the pressure ring are rounded.

[0019] By adopting the above technical solution, the sharp corners are prevented from scratching the flexible joint during installation or vibration, thus protecting the integrity of the flexible joint, reducing air leakage caused by damage to the flexible joint, and extending the service life of the flexible joint.

[0020] Furthermore, the top section of the fixing groove is hexagonal, and the bottom section of the fixing groove is circular.

[0021] By adopting the above technical solution, the top hexagon matches the shape of the nut, which can circumferentially limit the nut and prevent it from rotating with the flange bolt; the bottom circle is a cavity to accommodate the puncture head.

[0022] Furthermore, the upper surface, the upper back surface, and the upper sides of the fixing groove are all sloped, and the nuts are fixed to the inside of the fixing groove by welding.

[0023] By adopting the above technical solution, the sloping design increases the welding contact area between the fixing groove and the flange cylinder, thereby improving the welding strength; the nut is welded and fixed to the fixing groove to prevent axial movement and ensure the stability of the threaded connection. At the same time, the flat welding surface can reduce the wear on the flexible joint cylinder.

[0024] A centrifugal fan, wherein a flange cylinder is connected to a volute at one end, and an impeller is connected inside the volute. An air outlet is provided on the lower back of the volute, an air inlet is provided on one side of the volute, and a bracket is connected to the other side of the volute. A motor is installed on one side of the bracket, and the output end of the motor is connected to the impeller inside the volute.

[0025] By adopting the above technical solution, the motor drives the impeller to rotate to achieve gas transportation. The flange cylinder connects the volute to the external pipeline. The flexible joint in the installation structure can buffer vibration and adapt to installation deviations. The bracket provides stable support for the overall structure, so that the centrifugal fan has the characteristics of efficient gas transportation, low vibration, and easy maintenance when running.

[0026] In summary, the present invention has the following main advantages:

[0027] 1. This utility model, through the setting of positioning blocks and positioning holes, with the number of positioning blocks being the same as the number of lifting seats, flange bolts and nuts, and all five being distributed in a circular array at equal intervals, ensures that during the assembly process, when the positioning blocks enter the positioning blocks, the positions of the lifting seats and nuts will be aligned; thus avoiding the phenomenon that the flange bolts cannot be installed due to angular deviation between the lifting seats and nuts during the assembly process.

[0028] 2. This utility model, through the setting of flange bolts and piercing heads, forms piercing heads by machining a conical shape at the end of the flange bolt. The piercing head facilitates the flange bolt to pass through the new flexible sleeve and into the nut for tightening. Compared with traditional self-tapping screws, it can also penetrate the flexible sleeve to form a more stable connection. Moreover, the machining of the piercing head does not have a cutting edge or a thread with a diameter that increases from small to large, unlike self-tapping screws. Therefore, it will not cut the internal thread of the nut, thus avoiding damage to the thread and affecting the stability of the threaded connection. It can be used multiple times to reduce resource waste.

[0029] 3. This utility model features a raised seat, which provides support and guidance for the flange bolts before the piercing head penetrates the flexible connector, preventing the flange bolts from tipping over during the penetration process. This facilitates the penetration of the piercing head through the flexible connector when the operator applies force to the flange bolts. Furthermore, the multiple circular holes on the raised seat and the flange end face are staggered, preventing the raised seat from obstructing the bolt installation when connecting the flange to the fan casing and pipeline with bolts; thus, it is convenient to operate. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of this utility model;

[0031] Figure 2 This is a schematic diagram of the flange cylinder structure of this utility model;

[0032] Figure 3 This is a schematic diagram of the cross-sectional structure of the flange cylinder of this utility model;

[0033] Figure 4 For the present utility model Figure 3 Enlarged view of the structure at point A in the image;

[0034] Figure 5 This is a schematic diagram of the exploded structure of the flange cylinder of this utility model.

[0035] In the diagram: 1. Flange cylinder; 2. Volute housing; 3. Pressure ring; 4. Flexible joint cylinder; 5. Positioning block; 6. Positioning hole; 7. Lifting seat; 8. Flange bolt; 9. Piercing head; 10. Nut; 11. Fixing groove; 12. Motor; 13. Bracket. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0037] The embodiments of this utility model will be described below based on its overall structure.

[0038] Example 1

[0039] An installation structure for a centrifugal fan, such as Figures 1-5 As shown, the device includes a flange cylinder 1, with a positioning block 5 fixed to one end. A flexible connector 4 is sleeved on the outside of the flange cylinder 1, and the flexible connector 4 is detachably connected to the flange cylinder 1. A pressure ring 3 is sleeved on the outside of the flexible connector 4, and the pressure ring 3 is detachably connected to the flexible connector 4. A positioning hole 6 is opened at one end of the pressure ring 3, and the positioning block 5 is detachably connected to the positioning hole 6. When replacing the flexible connector 4, the operator loosens and removes multiple flange bolts 8 in sequence, and then the operator can disassemble the pressure ring 3 and the flexible connector 4 in sequence. A lifting seat 7 is fixed to the top of the pressure ring 3, and a flange bolt 8 passes through one end of each lifting seat 7. A piercing head 9 is fixed to one end of each flange bolt 8. The piercing head 9 is conical and is machined from the end of the flange bolt 8. The top of the flange cylinder 1 has a... A fixing groove 11 is provided, and a nut 10 is connected inside the fixing groove 11. Multiple round holes are opened on the end face of the flange cylinder 1. Multiple positioning blocks 5, positioning holes 6, lifting seats 7, flange bolts 8, piercing heads 9, nuts 10 and fixing grooves 11 are provided. Multiple lifting seats 7 are staggered with multiple round holes on the end face of the flange cylinder 1. Multiple lifting seats 7 correspond to multiple positioning blocks 5 and positioning holes 6. The operator puts the flange bolt 8 into the lifting seat 7, and uses the lifting seat 7 to support and guide the flange bolt 8 to prevent the flange bolt 8 from tipping over during the application of force. Then the operator applies force to the flange bolt 8, so that the piercing head 9 at the end of the flange bolt 8 penetrates the flexible connector 4, and then enters the nut 10 and is tightened by the operator.

[0040] A centrifugal fan, such as Figure 1As shown, one end of the flange cylinder 1 is connected to the volute 2, and an impeller is connected inside the volute 2. An air outlet is located on the lower back of the volute 2, and an air inlet is located on one side of the volute 2. A bracket 13 is connected to the other side of the volute 2. The bracket 13 is installed on the support surface by bolts, thus completing the installation of the bracket 13. When connecting the air inlet and outlet of the volute 2 to the external pipeline, the installation is achieved through flexible joints. The installation structure of this centrifugal fan mainly involves fitting the flange cylinder 1 to the air inlet and outlet of the volute 2 and the flange of the pipeline, and then securing it with bolts. The tight limit is used to complete the installation of the centrifugal fan and pipeline; a motor 12 is installed on one side of the bracket 13, and the output end of the motor 12 is connected to the impeller inside the volute 2. When the centrifugal fan is running, the motor 12 drives the impeller inside the volute 2 to rotate at high speed. After the gas enters from the air inlet, it is accelerated and its flow direction is changed under the action of the centrifugal force of the impeller, and finally discharged from the air outlet. During this process, the flexible sleeve 4 buffers the vibration generated by the operation of the fan with its own flexibility, and its deformability adapts to possible installation deviations, ensuring the stable operation of the entire system.

[0041] Example 2

[0042] Based on the above embodiment 1, in order to prevent the sharp corners of the flange cylinder 1 and the pressure ring 3 from scratching the flexible joint cylinder 4 during installation or vibration, the following settings are now adopted.

[0043] See Figure 3 and Figure 4 In the above embodiment, the corners of the flange cylinder 1 and the pressure ring 3 are both rounded, and the edges of the flange cylinder 1 and the pressure ring 3 are rounded to avoid the sharp edges of the flange cylinder 1 or the pressure ring 3 from tearing the flexible joint cylinder 4 and causing air leakage during vibration.

[0044] Example 3

[0045] Based on the above embodiment 1, in order to improve the connection stability between the nut 10 and the fixing groove 11, the following settings are now adopted.

[0046] See Figures 3-5 In the above embodiment, the top section of the fixing groove 11 is hexagonal, the bottom section of the fixing groove 11 is circular, and the top, back, and sides of the outer surface of the fixing groove 11 are all sloping. The nut 10 is fixed to the inside of the fixing groove 11 by welding. The nut 10 is placed in the fixing groove 11 to prevent the nut 10 from rotating with the flange bolt 8. The nut 10 is welded to the fixing groove 11 to prevent the nut 10 from moving axially and affecting stability. This makes it easier to disassemble and assemble the flange bolt 8. The operator only needs to operate the flange bolt 8 and does not need to pay attention to the nut 10. In addition, the sloping surface of the fixing groove 11 increases the welding area. During the production process, the weld is ground flat and has sufficient strength to prevent the nut 10 from falling off. The flat surface also prevents air leakage and wear of the flexible connector 4 from the rough surface.

[0047] The implementation principle of this utility model is as follows: First, the bracket 13 is installed on the support surface by bolts, thereby completing the installation of the bracket 13; when the workers connect the air inlet and outlet of the volute 2 to the external pipeline, the installation is achieved by flexible connection, and the centrifugal fan installation structure is as follows: during installation, the flange cylinder 1 is fitted with the flange of the air inlet and outlet of the volute 2 and the pipeline, and then the bolts are tightened to limit the position, thereby completing the installation of the centrifugal fan and the pipeline.

[0048] When the centrifugal fan is running, the motor 12 drives the impeller inside the volute 2 to rotate at high speed. After the gas enters from the inlet, it is accelerated and its flow direction is changed under the action of the centrifugal force of the impeller, and finally discharged from the outlet. During this process, the flexible sleeve 4 buffers the vibration generated by the operation of the fan by its own flexibility, and its deformability adapts to possible installation deviations, ensuring the stable operation of the entire system.

[0049] When the flexible connector 4 is damaged due to external force or aging, the operator first disconnects the flexible connector from the centrifugal fan and the pipeline. When replacing the flexible connector 4, the operator loosens and removes the multiple flange bolts 8 in sequence, and then disassembles the pressure ring 3 and the flexible connector 4 in sequence. When installing a new flexible connector 4, the operator first places the pressure ring 3 over the outside of the flexible connector 4, moving the pressure ring 3 away from the end of the flexible connector 4. Then, the operator places the flexible connector 4 over the outside of the flange cylinder 1, and then slides the pressure ring 3 to the end of the flexible connector 4. Positioning block 5 enters positioning hole 6 to complete initial positioning; since the number of positioning blocks 5, positioning holes 6, lifting seat 7, flange bolts 8, and nuts 10 is the same and they are arranged in a ring array, when positioning block 5 enters positioning hole 6, lifting seat 7 will be precisely aligned with nut 10, avoiding the inability to assemble subsequent connecting parts due to angular deviation. In addition, the lifting seat 7 and the multiple round holes on the end face of flange cylinder 1 are staggered, preventing lifting seat 7 from obstructing bolt installation when connecting flange cylinder 1 to fan casing 2 and pipeline with bolts.

[0050] After positioning, the worker places the flange bolt 8 into the lifting seat 7, using the lifting seat 7 to support and guide the flange bolt 8, preventing it from tipping over during force application. Then, the worker applies force to the flange bolt 8, causing the piercing head 9 at the end of the flange bolt 8 to penetrate the flexible connector 4, and then enter the nut 10, which is then tightened by the worker. During this process, the nut 10 is placed in the fixing groove 11 to prevent it from rotating with the flange bolt 8, and the nut 10 is welded to the fixing groove 11 to prevent axial movement of the nut 10 from affecting stability. This makes disassembling and assembling the flange bolt 8 much simpler; the worker only needs to operate the flange bolt 8 and does not need to pay attention to the nut 10. Furthermore, the inclined surface of the fixing groove 11 increases the welding area, and the weld seam can be ground smooth during the production process to retain sufficient strength to prevent the nut 10 from falling off. The smooth surface also prevents air leakage and wear of the flexible joint 4 from the rough surface. After the multiple flange bolts 8 are tightened, the flexible joint 4 is firmly pressed by the cooperation of the pressure ring 3 and the flange 1 to form a stable connection structure. The corners of the flange 1 and the pressure ring 3 are rounded to prevent the sharp edges of the flange 1 or the pressure ring 3 from scratching the flexible joint 4 and causing air leakage during vibration. Compared with the traditional connection method, the piercing head 9 will not cut the internal thread of the nut 10, ensuring connection stability and reusability.

[0051] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. An installation structure for a centrifugal fan, comprising a flange cylinder (1), characterized in that: A positioning block (5) is fixed at one end of the flange cylinder (1). A flexible sleeve (4) is sleeved on the outside of the flange cylinder (1), and a pressure ring (3) is sleeved on the outside of the flexible sleeve (4). A positioning hole (6) is opened at one end of the pressure ring (3). A lifting seat (7) is fixed on the top of the pressure ring (3), and a flange bolt (8) is passed through one end of the lifting seat (7). A piercing head (9) is fixed on one end of the flange bolt (8). A fixing groove (11) is opened on the top of the flange cylinder (1), and a nut (10) is connected inside the fixing groove (11).

2. The installation structure of the centrifugal fan according to claim 1, characterized in that: The positioning block (5) is detached from the positioning hole (6).

3. The installation structure of the centrifugal fan according to claim 2, characterized in that: The flange cylinder (1) has multiple round holes on its end face, and multiple positioning blocks (5), positioning holes (6), lifting seats (7), flange bolts (8), piercing heads (9), nuts (10) and fixing grooves (11) are provided.

4. The installation structure of the centrifugal fan according to claim 3, characterized in that: The multiple raised seats (7) are staggered with the multiple round holes on the end face of the flange cylinder (1), and the multiple raised seats (7) correspond to the multiple positioning blocks (5) and positioning holes (6).

5. The installation structure of the centrifugal fan according to claim 3, characterized in that: The puncture head (9) is conical and is machined from the end of the flange bolt (8).

6. The installation structure of the centrifugal fan according to claim 1, characterized in that: The flexible sleeve (4) is detached from the flange sleeve (1), and the pressure ring (3) is detached from the flexible sleeve (4).

7. The installation structure of the centrifugal fan according to claim 6, characterized in that: The corners of the flange (1) and the pressure ring (3) are both arc-shaped.

8. The installation structure of the centrifugal fan according to claim 3, characterized in that: The top section of the fixing groove (11) is hexagonal, and the bottom section of the fixing groove (11) is circular.

9. The installation structure of the centrifugal fan according to claim 8, characterized in that: The upper surface, back, and sides of the fixing groove (11) are all sloped, and the nut (10) is fixed to the inside of the fixing groove (11) by welding.

10. The centrifugal fan according to claim 1, characterized in that: One end of the flange cylinder (1) is connected to a volute (2), and an impeller is connected inside the volute (2). An air outlet is provided on the lower back of the volute (2), an air inlet is provided on one side of the volute (2), and a bracket (13) is connected to the other side of the volute (2). A motor (12) is installed on one side of the bracket (13), and the output end of the motor (12) is connected to the impeller inside the volute (2).

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