Square-to-round pipe connecting device for centrifugal fan

Abstract

The utility model relates to the technical field of centrifugal fans, and provides a square-to-round connecting pipe device for a centrifugal fan, which comprises a centrifugal fan, a reducing pipeline, a first flange and a second flange, a second connecting pipe and a first connecting pipe are installed at the two ends of the variable-diameter pipeline respectively. The centrifugal fan has the advantages that the air inlet of the centrifugal fan is transformed to be rectangular, the second flange is in butt joint with the air inlet, diameter changing is completed, connection with an external pipeline is achieved, airflow impact is reduced, the internal structure of the centrifugal fan is protected, more materials are saved in the manufacturing process, assembly is convenient, and production efficiency is improved. According to the centrifugal fan, the impact force of the second flange on the centrifugal fan is effectively reduced through the arrangement of the buffer pad, the centrifugal fan is protected, airflow can be blocked and shunted through the arrangement of the grating, and meanwhile large-size impurities can be blocked.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fans, and in particular to a square-to-round pipe connecting device for centrifugal fans. Background Art

[0002] A centrifugal fan is a commonly used wind transmission equipment used in industrial applications such as conveying gas, removing dust, boosting and ventilation. It draws in and accelerates gas through centrifugal force, and then discharges the gas through centrifugal force. The main components include 1. Impeller, used to rotate and accelerate the gas. The impeller is usually curved so that the gas can rotate on the impeller and be discharged; 2. Casing: used to surround the impeller, guide the gas to flow through the impeller, and increase the speed and pressure of the gas; 3. Drive device, an electric motor or other power device used to drive the impeller to rotate; 4. Air inlet and outlet, used to introduce and discharge gas into and out of the centrifugal fan.

[0003] The air inlet of the existing centrifugal fan is mostly set to be circular. The cross-sectional area of the circle is limited. The flow rate of the medium through the circular opening section is large, which is not good for the inlet of the centrifugal fan. There is a strong airflow impact, which can easily reduce the service life of the impeller. The existing reducer device is designed with circular openings of different sizes at both ends. In situations where there are requirements for flow rate, a larger circular opening is required. The selection of a larger circle for the inlet of the centrifugal fan requires a large circular opening. Since a large circular opening is required to open the fan inlet, it is obviously not easy to manufacture and is not beautiful. Utility Model Content

[0004] The utility model proposes a square-to-round connecting pipe device for a centrifugal fan. This solution transforms the air inlet of the centrifugal fan into a rectangle, and connects it to the air inlet through a second flange, completing the diameter change of the square connecting port into a circular connecting port, realizing connection with an external circular port pipe, and solving the problem that the centrifugal fan inlet cannot meet the high flow rate requirement when it is a circular port.

[0005] To this end, the technical solutions adopted are as follows:

[0006] A square-to-round pipe device for a centrifugal fan comprises a centrifugal fan, a reducing pipe, a first flange and a second flange, the centrifugal fan being respectively provided with an air inlet and an exhaust port, the air inlet being arranged into a rectangular structure, the second connecting pipe and the first connecting pipe being respectively installed at both ends of the reducing pipe, and the two ends of the reducing pipe respectively cover the edge positions of the second connecting pipe and the first connecting pipe, the first connecting pipe being arranged into an annular structure, the second connecting pipe being arranged into a rectangular structure matching the air inlet, a grille matching the shape of the inner cavity being installed inside the reducing pipe, the first flange being installed at one end of the first connecting pipe away from the reducing pipe, and the first flange being arranged into an annular structure, the shape of the second flange matching that of the second connecting pipe, and a buffer pad being installed between the second flange and the second connecting pipe, the buffer pad being arranged around the second flange and the second connecting pipe, and the two ends of the buffer pad respectively covering the edge positions of the second flange and the second connecting pipe.

[0007] Furthermore, the variable diameter pipe includes four first butt joint plates and a pair of second butt joint plates, and the pair of second butt joint plates are respectively arranged on both sides of the second connecting pipe.

[0008] Furthermore, both ends of the second docking plate are connected to the first connecting pipe and the second connecting pipe respectively, and the second docking plate is configured as a triangular structure.

[0009] Furthermore, the four first docking plates are symmetrically distributed in pairs, two adjacent first docking plates are connected to each other, and two adjacent first docking plates are connected to a pair of second docking plates at one end away from each other.

[0010] Furthermore, both ends of the first docking plate are connected to the first connecting pipe and the second connecting pipe respectively, and the first docking plate is configured as an arc-shaped structure.

[0011] Furthermore, a plurality of limiting columns are installed on one end of the second flange close to the second connecting pipe. The limiting columns are configured as large and small head structures, and the limiting columns pass through the second connecting pipe.

[0012] The working principle and beneficial effects of this application are:

[0013] 1. The centrifugal fan's air inlet is reshaped into a rectangular shape and connected to the air inlet through a second flange, completing the diameter change from a square connection to a circular connection, enabling connection to an external circular pipe. This solves the problem of a circular centrifugal fan inlet being unable to meet high flow rate requirements. The rectangular opening can meet the centrifugal fan inlet's maximum airflow deceleration requirement, reducing airflow impact and protecting the centrifugal fan's internal structure. The rectangular opening also makes it easier to meet the required cross-sectional area of the centrifugal fan.

[0014] 2. The rectangular connection port saves more materials during production and can be welded on four sides, making assembly more convenient.

[0015] 3. The setting of the buffer pad effectively reduces the impact force of the second flange on the centrifugal fan, thus protecting the centrifugal fan.

[0016] 4. The setting of the grille can block and divert the airflow, thereby further slowing down the flow rate of the gas. At the same time, it can block large-volume impurities and prevent them from entering the interior of the centrifugal fan during gas transmission and causing damage to the centrifugal fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present application will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0018] Figure 1 This is a schematic diagram of the overall structure of this application;

[0019] Figure 2 This is a schematic diagram of the structure of the variable diameter pipeline described in this application;

[0020] Figure 3 This is a schematic side view of the structure of the variable diameter pipe described in this application;

[0021] Figure 4 This is a schematic diagram of the top view of the variable diameter pipe described in this application;

[0022] Figure 5 This is a schematic structural diagram of the grid described in this application.

[0023] In the figure: 1. centrifugal fan; 2. first flange; 3. first connecting pipe; 4. reducing pipe; 41. first docking plate; 42. second docking plate; 5. second flange; 6. second connecting pipe; 7. limiting column; 8. buffer pad; 9. grille. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] like Figure 1-Figure 2As shown, a square-to-round pipe device for a centrifugal fan includes a centrifugal fan 1, a reducing pipe 4, a first flange 2 and a second flange 5. The centrifugal fan 1 is respectively provided with an air inlet and an exhaust port, and the air inlet is configured as a rectangular structure. The second connecting pipe 6 and the first connecting pipe 3 are respectively installed at both ends of the reducing pipe 4, and the two ends of the reducing pipe 4 cover the edge positions of the second connecting pipe 6 and the first connecting pipe 3 respectively. The first connecting pipe 3 is configured as an annular structure, and the second connecting pipe 6 is configured as a rectangular structure matching the air inlet. A grille 9 matching the shape of the inner cavity is installed inside the reducing pipe 4, and the grille 9 can be fixed to the inner wall of the reducing pipe 4 by welding. The first flange 2 is installed at the end of the first connecting pipe 3 away from the reducing pipe 4, and the first flange 2 can be fixed to the first connecting pipe 3 by welding, and the first flange 2 is configured as an annular structure. The shape of the second flange 5 matches that of the second connecting pipe 6, and a buffer pad 8 is installed between the second flange 5 and the second connecting pipe 6. The buffer pad 8 is arranged around the second flange 5 and the second connecting pipe 6, and the two ends of the buffer pad 8 respectively cover the edge positions of the second flange 5 and the second connecting pipe 6.

[0026] A centrifugal fan is a commonly used wind transmission equipment used in industrial applications such as conveying gas, removing dust, pressurizing and ventilation. It draws in and accelerates gas through centrifugal force, and then discharges the gas through centrifugal force. The existing centrifugal fan air inlet is mostly set to a circle. The cross-sectional area of the circle is limited. The flow rate of the medium through the circular opening section is large, which is not good for the inlet of the centrifugal fan. There is a strong airflow impact, which can easily reduce the service life of the impeller. The existing reducer device is designed with circular openings of different sizes at both ends. In situations where there are requirements for flow rate, a larger circular opening is required. The selection of a larger circle for the inlet of the centrifugal fan requires a larger circle. Since a large circular opening needs to be opened at the inlet of the fan, it is obviously not easy to manufacture.

[0027] In this solution, unlike the existing circular air inlet, the air inlet of the centrifugal fan 1 is directly set to be rectangular, and a plurality of threaded holes are opened near the air inlet. The user can fix the second flange 5 to the centrifugal fan 1 by means of bolts, so that the inner cavity of the reducing pipe 4 is connected to the air inlet. The first connecting pipe 3 plays a transitional role between the first flange 2 and the reducing pipe 4. The first flange 2 can be connected to most cylindrical external pipes by means of bolts. After the overall installation of the device, it will be connected to the air inlet of the centrifugal fan 1 as a whole, which can smoothly realize the connection between the rectangular air inlet of the centrifugal fan 1 and the external cylindrical pipe. The setting of the rectangular air inlet effectively increases the cross-sectional area of the air inlet. This reduces the flow rate of the medium entering the inlet of the centrifugal fan 1. Since the cross-sectional area of the rectangular air inlet is larger, when the same amount of gas passes through, the speed of the gas at the inlet will be relatively reduced compared to the circular inlet. The reduction in speed will reduce the velocity gradient, reduce the speed difference when the gas passes through the inlet, and reduce the possibility of airflow impact. When the gas passes through a wider air inlet, the same amount of gas is distributed over a larger cross-sectional area, making the kinetic energy distribution more uniform, reducing the kinetic energy of the gas, reducing the speed and pressure of the airflow at the inlet, and slowing down the impact of the gas on the centrifugal fan 1. At the same time, the adapter pipe 4 also plays a role in increasing the length of the air inlet, which can increase the time the gas passes through the inlet, reduce the airflow speed, and alleviate airflow impact.

[0028] In this solution, the material of the buffer pad 8 can be set to rubber. Rubber has good elasticity, can effectively absorb and disperse impact force, and reduce vibration transmission. Through the setting of the buffer pad 8, a buffering effect can be achieved between the second flange 5 and the second connecting pipe 6. Because when air is taken in inside the reducing pipe 4, the reducing pipe 4 will vibrate, and through the setting of the buffer pad 8, the impact force of the second flange 5 on the centrifugal fan 1 can be effectively reduced, thereby protecting the centrifugal fan 1.

[0029] In this solution, when the gas passes through the grille 9, the grille 9 will block and divert the airflow, thereby further slowing down the flow rate of the gas. In addition, through the setting of the grille 9, large-volume impurities can be blocked to prevent large-volume impurities from entering the interior of the centrifugal fan 1 during gas transmission and causing damage to the centrifugal fan 1.

[0030] like Figure 3-5As shown, the adapter pipe 4 includes four first docking plates 41 and a pair of second docking plates 42. The pair of second docking plates 42 are respectively arranged on both sides of the second connecting pipe 6. The two ends of the second docking plates 42 are respectively connected to the first connecting pipe 3 and the second connecting pipe 6. The two ends of the second docking plates 42 can be fixed to the first connecting pipe 3 and the second connecting pipe 6 by welding, and the second docking plates 42 are arranged in a triangular structure. The four first docking plates 41 are symmetrically distributed in pairs. The two adjacent first docking plates 41 are connected to each other. The two adjacent first docking plates 41 can be fixed by welding, and the two adjacent first docking plates 41 are connected to the pair of second docking plates 42 at one end away from each other. The two adjacent first docking plates 41 can be fixed to the pair of second docking plates 42 at one end away from each other. The two ends of the first docking plates 41 are respectively connected to the first connecting pipe 3 and the second connecting pipe 6. The two ends of the first docking plates 41 can be fixed to the first connecting pipe 3 and the second connecting pipe 6 by welding, and the first docking plates 41 are arranged in an arc structure.

[0031] In this solution, the combination of the first docking plate 41 and the second docking plate 42 can effectively fill the space between the first flange 2 and the second flange 5, providing an effective flow channel for the gas. Under the same cross-sectional area, the cross-sectional area of the square mouth can more easily reach the area required by the centrifugal fan 1. Therefore, when the reducer pipe 4 is manufactured, the steel plate is cut into pieces, which saves materials and reduces waste. The four sides can be welded, which is more convenient. In comparison, when the existing circular reducer device is manufactured, the steel plate is cut into a circle, which causes more waste and cannot be welded.

[0032] A plurality of limiting columns 7 are installed on one end of the second flange 5 close to the second connecting pipe 6 . The limiting columns 7 can be fixed to the second flange 5 by welding. The limiting columns 7 are configured as a large and small head structure, and the limiting columns 7 pass through the second connecting pipe 6 .

[0033] In this solution, multiple limit columns 7 limit the second flange 5 to prevent the buffer pad 8 from being stretched, and avoid the buffer pad 8 from being separated from the second flange 5 or the second connecting pipe 6 during the vibration of the variable diameter pipe 4, thereby ensuring the overall airtightness of the device.

[0034] Working principle:

[0035] When in use, the user fixes the second flange 5 on the rectangular air inlet of the centrifugal fan 1 by means of bolts, so that the inner cavity of the adapter pipe 4 is connected to the air inlet, and then the first flange 2 is connected to the external pipe by means of bolts. After the device is installed as a whole, it is connected to the inlet of the centrifugal fan 1 as a whole, realizing the connection between the rectangular air inlet of the centrifugal fan 1 and the external cylindrical pipe, effectively increasing the cross-sectional area of the air inlet, thereby reducing the flow rate of the medium entering the inlet of the centrifugal fan 1, and the adapter pipe 4 also plays a role in increasing the length of the air inlet, which can increase the air The time for the body to pass through the port is shortened, the air flow speed is reduced, and the air flow impact is alleviated. The setting of the buffer pad 8 can play a buffering effect between the second flange 5 and the second connecting pipe 6, effectively reducing the impact force of the second flange 5 on the centrifugal fan 1, thereby protecting the centrifugal fan 1. When the gas passes through the inner cavity of the reducing pipe 4, the grille 9 will block and divert the airflow, thereby further slowing down the flow rate of the gas, and the setting of the grille 9 can block large-volume impurities, preventing large-volume impurities from entering the interior of the centrifugal fan 1 during gas transmission.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A square-to-round pipe connection device for a centrifugal fan, characterized in that: include: A centrifugal fan (1), wherein an air inlet and an air outlet are respectively provided on the centrifugal fan (1), and the air inlet is configured as a rectangular structure; A reducing pipe (4), wherein the reducing pipe (4) is respectively provided with a second connecting pipe (6) and a first connecting pipe (3), and the two ends of the reducing pipe (4) respectively cover the edge positions of the second connecting pipe (6) and the first connecting pipe (3), the first connecting pipe (3) is provided as an annular structure, the second connecting pipe (6) is provided as a rectangular structure matching the air inlet, and the interior of the reducing pipe (4) is provided with a grille (9) matching the shape of the inner cavity; A first flange (2), the first flange (2) being mounted on an end of the first connecting pipe (3) away from the reducing pipe (4), and the first flange (2) being configured as an annular structure; A second flange (5), the shape of the second flange (5) matches the second connecting pipe (6), and a buffer gasket (8) is installed between the second flange (5) and the second connecting pipe (6), the buffer gasket (8) is arranged around the second flange (5) and the second connecting pipe (6), and the two ends of the buffer gasket (8) respectively cover the edge positions of the second flange (5) and the second connecting pipe (6).

2. The square-to-round pipe connecting device for a centrifugal fan according to claim 1, characterized in that: The variable diameter pipe (4) comprises four first butt joint plates (41) and a pair of second butt joint plates (42), and the pair of second butt joint plates (42) are respectively arranged on both sides of the second connecting pipe (6).

3. The square-to-round pipe connecting device for a centrifugal fan according to claim 2, characterized in that: Both ends of the second docking plate (42) are connected to the first connecting pipe (3) and the second connecting pipe (6) respectively, and the second docking plate (42) is configured as a triangular structure.

4. The square-to-round pipe connecting device for a centrifugal fan according to claim 2, characterized in that: The four first docking plates (41) are symmetrically distributed in pairs, two adjacent first docking plates (41) are connected to each other, and two adjacent first docking plates (41) are connected to a pair of second docking plates (42) at one end away from each other.

5. The square-to-round pipe connecting device for a centrifugal fan according to claim 2, characterized in that: Both ends of the first docking plate (41) are respectively connected to the first connecting pipe (3) and the second connecting pipe (6), and the first docking plate (41) is configured as an arc-shaped structure.

6. The square-to-round pipe connecting device for a centrifugal fan according to claim 1, characterized in that: A plurality of limiting columns (7) are installed at one end of the second flange (5) close to the second connecting pipe (6), the limiting columns (7) being configured as a large and small head structure, and the limiting columns (7) pass through the second connecting pipe (6).

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