Volute assembly of large centrifugal blower

Abstract

The utility model relates to a large centrifugal blower volute assembly, relates to the technical field of centrifugal blowers, and aims to solve the problems that a traditional volute is long in casting period and high in cost, the large centrifugal blower volute assembly comprises a volute, a current collector and a rear side plate, the current collector and the rear side plate are detachably connected to the volute, the volute comprises an outlet reducer pipe and a plurality of reducer volute plates, and the reducer volute plates are detachably connected to the outlet reducer pipe. An outlet flange is arranged at the large end of the outlet reducer pipe, a first bolt hole used for being connected with a pipe fitting is formed in the outlet flange in a penetrating mode, the multiple reducing worm plates are all arranged at the small end of the outlet reducer pipe, and the cross section of each reducing worm plate is round. The areas of the cross sections of the variable-diameter worm plates are sequentially reduced in the direction away from the outlet variable-diameter pipe. The method has the advantages that the manufacturing cost is reduced, the manufacturing period is shortened, and serialized design and manufacturing are easy to carry out.

Description

Technical Field

[0001] The present application relates to the technical field of centrifugal blowers, and in particular to a volute assembly of a large centrifugal blower. Background Art

[0002] As key equipment, centrifugal blowers play an indispensable role in many industries such as electricity, metallurgy, chemical industry, papermaking, pharmaceuticals and municipal sewage treatment. With the continuous advancement of modern industrial technology and the continuous expansion of process system scale, the performance and specification requirements of centrifugal blowers are increasing, especially the demand for large-scale and high-efficiency centrifugal blowers is becoming more and more significant. This trend has directly promoted the development of supporting blowers towards larger scale and higher efficiency. Therefore, large centrifugal blowers have become the mainstream products on the market.

[0003] In the related art, the volute of a large centrifugal blower is often made of cast iron, and a wooden mold needs to be made first. The mold making cost is high and the casting process is complicated. In order to ensure strength and avoid defects such as insufficient pouring and cold shut of the casting, the wall thickness of the cast volute is relatively thick and the weight is heavy. Therefore, the manufacturing cost of a single piece of the cast volute is high and the cycle is long. If the size of the volute is changed, the mold needs to be remade, and the manufacturing cycle is long and the cost is high, so there is room for improvement. Utility Model Content

[0004] In order to solve the problems of long casting cycle and high cost of traditional volutes, the present application provides a large centrifugal blower volute assembly.

[0005] The present application provides a large centrifugal blower volute assembly adopting the following technical solution:

[0006] A large centrifugal blower volute assembly includes a volute, a collector and a rear side plate, wherein the collector and the rear side plate are both detachably connected to the volute, and the volute includes an outlet reducer and a plurality of reducing volute plates. The large end of the outlet reducer is provided with an outlet flange, and a first bolt hole for connecting to a pipe fitting is opened through the outlet flange. The plurality of reducing volute plates are arranged at the small end of the outlet reducer, and the cross-section of the reducing volute plates is circular, and the cross-sectional area of ​​the plurality of reducing volute plates decreases successively in the direction away from the outlet reducer.

[0007] Since the volute is usually made of cast iron, a wooden mold must be made first. The mold making cost is high, the casting process is complicated, the single-piece manufacturing cost of the cast volute is high, and the cycle is long. By adopting the above technical solution, including the volute, the collector and the rear side plate, the volute is welded with an outlet reducer and a plurality of reducing volute plates. When making the volute, first, according to the design drawings, the steel plate of the required size is cut to make the outlet reducer and a plurality of reducing volute plates. Next, the outlet flange is welded to the large end of the outlet reducer, and the first bolt hole required for the connection is opened on the flange. Subsequently, the plurality of reducing volute plates are welded to the small end of the outlet reducer in sequence according to the design requirements. After the welding is completed, the volute is subjected to a comprehensive quality inspection. Finally, the collector and the rear side plate are detachably connected to the volute by bolts or other connection methods, and the production of the volute assembly of the large centrifugal blower can be completed.

[0008] Through the settings of the outlet reducer, reducing volute, etc., the volute welded with steel plates has higher strength compared with the cast volute, and can meet the strength requirements under higher pressure and more complex working conditions. The welded volute does not require mold making, and the wall thickness can be reduced by half, which not only reduces the overall weight of the volute, but also effectively reduces the manufacturing cost, shortens the manufacturing cycle, and is easy to design and manufacture in series. At the same time, the cross-sectional shape of the reducing volute is designed to be circular, which is conducive to the smooth flow of gas, reduces the resistance and eddy currents during the flow process, thereby reducing flow losses and high efficiency.

[0009] Optionally, a front side plate is provided on the front side of the variable diameter snail, a first reinforcement ring is provided at the inner hole of the front side plate, and a second reinforcement ring is provided on the rear side of the variable diameter snail.

[0010] By adopting the above technical solution, the front side plate is installed on the front side of the variable diameter volute, the first reinforcement ring is installed at the inner hole of the front side plate, and the second reinforcement ring is installed on the rear side of the variable diameter volute; through the arrangement of the front side plate, the first reinforcement ring and the second reinforcement ring, the front side plate, as a part of the volute assembly, provides necessary support for the entire structure. It is connected to the front side of the variable diameter volute and works together with the first reinforcement ring to enhance the overall strength and stability of the volute. At the same time, the first reinforcement ring and the second reinforcement ring, as an important engineering element, can effectively prevent deformation and damage by increasing the local stiffness and bearing capacity of the structure.

[0011] Optionally, the current collector is arranged on the front side of the first reinforcement ring, and a third bolt hole for fixing is opened on the current collector.

[0012] By adopting the above technical solution, the collector is provided with a third bolt hole; the provision of the third bolt hole makes the installation and disassembly of the collector easier, and facilitates the adjustment of the position of the collector to meet different work requirements. At the same time, when the collector needs to be maintained or replaced, it can also be quickly disassembled and reinstalled.

[0013] Optionally, a first O-ring for sealing is provided between the current collector and the first reinforcement ring.

[0014] By adopting the above technical solution, the first O-ring is installed between the collector and the first reinforcement ring; through the setting of the first O-ring, the O-ring, with its unique circular cross-section design and excellent elasticity, can form a tight seal between the collector and the first reinforcement ring, effectively prevent gas leakage, ensure the stability of the air pressure inside the volute, and thus improve the efficiency of the centrifugal blower.

[0015] Optionally, a first lifting threaded hole for lifting is provided on the collector, a circular lifting hole for facilitating lifting is provided on the outside of the collector, and a second bolt hole for facilitating pipe connection is also provided on the collector.

[0016] By adopting the above technical solution, a first lifting threaded hole, a circular lifting hole and a second bolt hole are opened on the collector. At the same time, the first lifting threaded hole, the circular lifting hole and the second bolt hole are set, the first lifting threaded hole can easily lift the collector, facilitate its installation and disassembly, reduce the maintenance difficulty, and improve work efficiency. The circular lifting hole provides a more stable lifting point, reduces the risk of the collector falling off or tilting during lifting, and improves the safety of the operation. At the same time, the second bolt hole connection method is simple and fast, and has high reliability and stability.

[0017] Optionally, a rear side plate is provided on the rear side of the second reinforcement ring, and a fourth bolt hole for fixing is opened through the rear side plate.

[0018] By adopting the above technical solution, the rear side plate is installed on the rear side of the second reinforcement ring, and a fourth bolt hole is opened on the rear side plate; through the setting of the rear side plate and the fourth bolt hole, the combination of the rear side plate and the second reinforcement ring further enhances the structural stability of the volute assembly. The rear side plate serves as an additional supporting structure, which can withstand the huge pressure and vibration generated by the centrifugal blower during operation, ensuring the stability of the entire volute assembly. At the same time, the fourth bolt hole makes the installation and disassembly of the rear side plate easier.

[0019] Optionally, a second O-ring for sealing is provided between the rear side plate and the second reinforcement ring.

[0020] By adopting the above technical solution, the second O-ring is installed between the rear side plate and the second reinforcement ring; through the setting of the second O-ring, the O-ring has excellent elasticity and sealing performance, and can form a tight seal between the rear side plate and the second reinforcement ring, effectively preventing gas leakage, ensuring the stability of the air pressure inside the volute, thereby improving the efficiency of the centrifugal blower.

[0021] Optionally, a second lifting threaded hole for lifting is provided on the rear side plate, and a connecting threaded hole for convenient connection with a bearing box or a gear box is provided on the rear side plate.

[0022] By adopting the above technical solution, the second lifting threaded hole and the connecting threaded hole are opened on the rear side plate; through the setting of the second lifting threaded hole and the connecting threaded hole, the second lifting threaded hole can easily lift the rear side plate, and the lifting force is conveniently applied through threaded connection, which improves the convenience and efficiency of operation. At the same time, the connecting threaded hole enables the rear side plate to be conveniently fixed together with components such as the bearing box or gear box through threaded connection, with a simple structure, reliable connection, and easy disassembly.

[0023] Optionally, the outside of the volute is provided with a lifting lug for lifting and a boss for processing, clamping and fixing, and the bottom of the volute is provided with a drain port for discharging condensed water.

[0024] By adopting the above technical solution, the lifting ear and the boss are welded and fixed to the outside of the volute, and the drain port is opened at the bottom of the volute; through the setting of the lifting ear, the boss and the drain port, the lifting ear can be conveniently lifted and moved by lifting tools, which reduces the difficulty and risk of manual handling and improves work efficiency. The boss provides a convenient positioning point and support surface for the processing and clamping of the volute, which helps to maintain the stability and precision of the volute during the processing. The drain port can conveniently discharge the condensed water accumulated inside the volute, which helps to prevent the condensed water from corroding and damaging the inside of the volute and extend the service life of the equipment.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] Through the configuration of the outlet reducer and the reducing volute, the volute welded from steel plates has higher strength than the cast volute and can meet the strength requirements under higher pressure and more complex working conditions. The welded volute does not require mold making and the wall thickness can be reduced by half, which not only reduces the overall weight of the volute, but also effectively reduces the manufacturing cost and shortens the manufacturing cycle, making it easy to carry out serial design and manufacturing. At the same time, the cross-sectional shape of the reducing volute is designed to be circular, which is conducive to the smooth flow of gas, reduces the resistance and eddy current in the flow process, thereby reducing flow loss and improving efficiency.

[0027] The front side plate, the first reinforcement ring, and the second reinforcement ring are arranged so that the front side plate, as part of the volute assembly, provides the necessary support for the entire structure. It is connected to the front side of the variable diameter volute and works together with the first reinforcement ring to enhance the overall strength and stability of the volute. At the same time, the first and second reinforcement rings, as important engineering components, can effectively prevent deformation and damage by increasing the local stiffness and load-bearing capacity of the structure.

[0028] Through the setting of the second lifting threaded hole and the connecting threaded hole, the second lifting threaded hole can easily lift the rear side plate, and the lifting force can be conveniently applied through the threaded connection, which improves the convenience and efficiency of operation. At the same time, the connecting threaded hole enables the rear side plate to be conveniently fixed to components such as the bearing box or gear box through threaded connection. It has a simple structure, reliable connection, and is easy to disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a large centrifugal blower volute assembly in an embodiment of the present application.

[0030] Figure 2 It is a cross-sectional view of a volute assembly of a large centrifugal blower in an embodiment of the present application.

[0031] Figure 3 It is a cross-sectional view used to illustrate the volute structure in the embodiment of the present application.

[0032] Figure 4 It is a side view used to illustrate the rear side panel structure in the embodiment of the present application.

[0033] Explanation of the accompanying reference numerals: 1. volute; 2. collector; 3. rear side plate; 4. outlet flange; 5. outlet reducer; 6. reducing volute; 7. front side plate; 8. first reinforcement ring; 9. second reinforcement ring; 10. lifting ear; 11. boss; 12. drain port; 13. first O-ring; 14. second O-ring; 15. first lifting threaded hole; 16. second lifting threaded hole; 17. lifting hole; 18. connecting threaded hole; 19. first bolt hole; 20. second bolt hole; 21. third bolt hole; 22. fourth bolt hole. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-4 This application is described in further detail.

[0035] The embodiment of the present application discloses a large centrifugal blower volute assembly. Figure 1 and Figure 2 The volute assembly of a large centrifugal blower includes a volute 1, a collector 2 and a rear side plate 3. In this embodiment, the collector 2 and the rear side plate 3 are both installed on the volute 1 by bolts.

[0036] Reference Figure 1 and Figure 3 The volute 1 is welded and fixed with a lifting lug 10 with a round hole around it. The lifting lug 10 can be easily lifted and moved by a lifting tool, which reduces the difficulty and risk of manual handling and improves work efficiency.

[0037] Reference Figure 1, bosses 11 are welded and fixed around the volute 1, and the bosses 11 provide convenient positioning points and support surfaces for the processing and clamping of the volute 1, which helps to maintain the stability and accuracy of the volute 1 during the processing.

[0038] Reference Figure 1 and Figure 3 A drain port 12 is installed at the bottom of the volute 1. The drain port 12 can conveniently discharge the condensed water accumulated inside the volute 1, which helps prevent the condensed water from corroding and damaging the inside of the volute 1 and prolong the service life of the equipment.

[0039] Reference Figure 1 and Figure 3 The volute 1 is made of welded steel plates. The volute 1 includes an outlet reducer 5 and several reducing volute plates 6. The large end of the outlet reducer 5 is welded and fixed with an outlet flange 4. The outlet flange 4 is penetrated by a first bolt hole 19. The first bolt hole 19 is for connection with the outlet pipe fitting. Several reducing worms are welded and formed in sequence along the small end of the outlet reducer 5. The volute 1 welded with steel plates has higher strength and can meet the strength requirements under higher pressure and more complex working conditions. The welded volute 1 does not require a mold and the wall thickness can be reduced by half, which not only reduces the overall weight of the volute 1, but also effectively reduces the manufacturing cost, shortens the manufacturing cycle, and is easy to design and manufacture in series.

[0040] Reference Figure 1 and Figure 3 In this embodiment, the cross-section of the reducing volute 6 is circular, and the cross-sectional areas of several reducing volutes 6 decrease successively in the direction away from the outlet reducing pipe 5, which is conducive to the smooth flow of gas, reduces the resistance and eddy current in the flow process, thereby reducing the flow loss and improving the efficiency.

[0041] Reference Figure 1 and Figure 2 A front side plate 7 is installed on the front side of several variable diameter volute plates 6. The front side plates 7 are installed by welding. A first reinforcement ring 8 is welded at the inner hole of the front side plate 7. At the same time, a second reinforcement ring 9 is welded and installed on the rear side of several variable diameter volute plates 6. The front side plate 7, as part of the volute 1 assembly, provides necessary support for the entire structure. It is connected to the front side of the variable diameter volute plate 6 and works together with the first reinforcement ring 8 to enhance the overall strength and stability of the volute 1. At the same time, the first reinforcement ring 8 and the second reinforcement ring 9, as an important engineering component, can effectively prevent deformation and damage by increasing the local stiffness and bearing capacity of the structure.

[0042] Reference Figure 1 and Figure 2In this embodiment, the current collector 2 is made of cast iron and then machined. The current collector 2 is installed on the front side of the first reinforcement ring 8. A third bolt hole 21 is opened through the current collector 2 and can be fixed to the front side of the first reinforcement ring 8 by bolts; this makes the installation and disassembly of the current collector 2 easier, and the position of the current collector 2 is convenient to adjust to meet different work requirements. At the same time, when the current collector 2 needs to be maintained or replaced, it can also be quickly disassembled and reinstalled.

[0043] Reference Figure 1 and Figure 2 A first lifting threaded hole 15 is provided on the collector 2. In this embodiment, the number of the first lifting threaded holes 15 can be four. The first lifting threaded hole 15 can easily lift the collector 2, facilitate its installation and disassembly, reduce the maintenance difficulty, and improve work efficiency; a circular lifting hole 17 is installed on the outside of the collector 2. The circular lifting hole 17 provides a more stable lifting point, reduces the risk of the collector 2 falling off or tilting during the lifting process, and improves the safety of the operation.

[0044] Reference Figure 1 and Figure 2 A second bolt hole 20 is also provided on the collector 2. In this embodiment, the second bolt hole 20 is for connection with the inlet pipe. The connection method of the second bolt hole 20 is simple and fast, and has high reliability and stability.

[0045] Reference Figure 2 A first O-ring 13 is installed between the collector 2 and the first reinforcement ring 8. The first O-ring 13, with its unique circular cross-section design and excellent elasticity, can form a tight seal between the collector 2 and the first reinforcement ring 8, effectively preventing gas leakage and ensuring the stability of the air pressure inside the volute 1, thereby improving the efficiency of the centrifugal blower.

[0046] Reference Figure 2 and Figure 4 , a rear side plate 3 is installed on the rear side of the second reinforcement ring 9. In this embodiment, the rear side plate 3 is made of steel plate machine, and a fourth bolt hole 22 is opened on the rear side plate 3, which can be fixed to the rear side of the second reinforcement ring 9 by bolts; the combination of the rear side plate 3 and the second reinforcement ring 9 further enhances the structural stability of the volute 1 assembly. The rear side plate 3 serves as an additional supporting structure, which can withstand the huge pressure and vibration generated by the centrifugal blower during operation, ensuring the stability of the entire volute 1 assembly. At the same time, the fourth bolt hole 22 makes the installation and disassembly of the rear side plate 3 easier.

[0047] Reference Figure 2 and Figure 4, a second lifting threaded hole 16 is provided on the rear side panel 3, and the number of the second lifting threaded holes 16 is four. The second lifting threaded holes 16 can easily lift the rear side panel 3, and the lifting force is conveniently applied by threaded connection, which improves the convenience and efficiency of operation; the rear side panel 3 is also provided with a connecting threaded hole 18, and the connecting threaded hole 18 enables the rear side panel 3 to be conveniently fixed together with components such as the bearing box or the gear box through threaded connection, with a simple structure, reliable connection, and easy disassembly.

[0048] Reference Figure 2 A second O-ring 14 is installed between the rear side plate 3 and the second reinforcement ring 9. The second O-ring 14 has excellent elasticity and sealing performance, and can form a tight seal between the rear side plate 3 and the second reinforcement ring 9, effectively preventing gas leakage and ensuring the stability of the air pressure inside the volute 1, thereby improving the efficiency of the centrifugal blower.

[0049] The implementation principle of a large centrifugal blower volute 1 assembly according to the embodiment of the present application is as follows: when the volute 1 is manufactured, first, according to the design drawings, steel plates of the required size are cut to manufacture the outlet reducer 5 and a plurality of reducing volute plates 6; next, the outlet flange 4 is welded to the large end of the outlet reducer 5, and a first bolt hole 19 required for connection is opened on the flange; then, the plurality of reducing volute plates 6 are welded to the small end of the outlet reducer 5 in sequence according to the design requirements; after the welding is completed, the front side plate 7, the first reinforcement ring 8 and the second reinforcement ring 9 are welded, and the first O-ring 13 and the second O-ring 14 are installed; the volute 1 is subjected to a comprehensive quality inspection; finally, the collector 2 and the rear side plate 3 are mounted on the volute 1 by means of bolts or other connection methods, and the manufacture of the large centrifugal blower volute 1 assembly is completed;

[0050] Through the settings of the outlet reducer 5, the reducing volute 6, etc., the volute 1 welded with steel plates has higher strength compared with the cast volute 1, and can meet the strength requirements under higher pressure and more complex working conditions. The welded volute 1 does not require mold making, and the wall thickness can be reduced by half, which not only reduces the overall weight of the volute 1, but also effectively reduces the manufacturing cost, shortens the manufacturing cycle, and is easy to carry out serial design and manufacturing. At the same time, the cross-sectional shape of the reducing volute 6 is designed to be circular, which is conducive to the smooth flow of gas, reduces the resistance and eddy current in the flow process, thereby reducing flow loss and high efficiency.

[0051] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A large centrifugal blower volute assembly, characterized by: The invention comprises a volute (1), a flow collector (2) and a rear side plate (3), wherein the flow collector (2) and the rear side plate (3) are both detachably connected to the volute (1), and the volute (1) comprises an outlet reducer (5) and a plurality of reducing volute plates (6), wherein the large end of the outlet reducer (5) is provided with an outlet flange (4), and a first bolt hole (19) for connecting with a pipe fitting is provided through the outlet flange (4), and the plurality of reducing volute plates (6) are all arranged at the small end of the outlet reducer (5), and the cross section of the reducing volute plates (6) is circular, and the cross-sectional area of ​​the plurality of reducing volute plates (6) decreases in sequence in a direction away from the outlet reducer (5).

2. A large centrifugal blower volute assembly according to claim 1, characterized in that: A front side plate (7) is provided on the front side of the variable diameter volute (6), a first reinforcement ring (8) is provided at the inner hole of the front side plate (7), and a second reinforcement ring (9) is provided on the rear side of the variable diameter volute (6).

3. A large centrifugal blower volute assembly according to claim 2, characterized in that: The current collector (2) is arranged on the front side of the first reinforcement ring (8), and a third bolt hole (21) for fixing is provided on the current collector (2).

4. A large centrifugal blower volute assembly according to claim 3, characterized in that: A first O-shaped sealing ring (13) for sealing is provided between the current collector (2) and the first reinforcement ring (8).

5. The large centrifugal blower volute assembly according to claim 3, characterized in that: The collector (2) is provided with a first lifting threaded hole (15) for lifting, the outside of the collector (2) is provided with a circular lifting hole (17) for facilitating lifting, and the collector (2) is also provided with a second bolt hole (20) for facilitating pipe connection.

6. A large centrifugal blower volute assembly according to claim 2, characterized in that: A rear side plate (3) is provided on the rear side of the second reinforcement ring (9), and a fourth bolt hole (22) for fixing is provided through the rear side plate (3).

7. A large centrifugal blower volute assembly according to claim 6, characterized in that: A second O-shaped sealing ring (14) for sealing is provided between the rear side plate (3) and the second reinforcement ring (9).

8. The large centrifugal blower volute assembly according to claim 6, characterized in that: A second jacking threaded hole (16) for jacking is provided on the rear side plate (3), and a connecting threaded hole (18) for convenient connection with a bearing box or a gear box is provided on the rear side plate (3).

9. The large centrifugal blower volute assembly according to claim 1, characterized in that: The outside of the volute (1) is provided with a lifting lug (10) for lifting and a boss (11) for processing, clamping and fixing. The bottom of the volute (1) is provided with a drain port (12) for discharging condensed water.

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