Blast system for reducing kinetic energy loss of air flow

Abstract

The utility model provides a blast system for reducing airflow kinetic energy loss, the direction of blast equipment towards one side of an air distribution pipe air distribution device is set as a first direction, the blast equipment comprises a blast blower body and an air outlet pipe orifice, the blast blower body and the air outlet pipe orifice are configured to be arranged along the first direction, and an airflow channel is arranged in an anticlockwise spiral structure; the included angle between the axis extending direction of the side, deviating from the first direction, of the air outlet pipe opening and the horizontal plane is 135 degrees, and pipe openings in the two ends of the ventilation guide pipe fixedly communicate with the air outlet pipe opening of the air blasting equipment and an air inlet end pipe opening of the air distribution pipe air distribution device correspondingly and are used for conducting airflow generated by the air blasting equipment to the air distribution pipe air distribution device. The air inlet end pipeline of the air distribution pipe air distribution device is kept horizontally extending, and the included angle between the extending direction of the axis of the ventilation guide pipe in the first direction and the extending direction of the axis of the air inlet end pipeline of the air distribution pipe air distribution device is 135 degrees. According to the utility model, the airflow transmission efficiency of the air-blast system can be effectively improved, and the noise can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of air blast systems, and in particular relates to an air blast system for reducing kinetic energy loss of airflow. Background Art

[0002] The blower system is an air supply and treatment system widely used in industrial production. It can use a blower or other types of compressors to generate an air flow of a certain pressure, and then transport the high-pressure air flow to a designated location through a pipeline to meet specific process requirements. Therefore, the blower system is commonly found in boilers, blast furnaces, sewage treatment, chemical production, cement manufacturing, power generation and other industries.

[0003] The main body of the blast system includes blast equipment and a pipeline system. During the assembly process of the various components of the blast system, the problem of attenuation of the kinetic energy of the airflow generated by the blast equipment is an important research topic under the existing technology. Under the existing technology, for blast equipment that can generate medium and high pressure airflow, the airflow at its outlet often produces an uneven vortex state. At the same time, limited by the spatial layout size of the industrial site, the length of the pipeline system in the existing blast system often cannot meet the layout requirements of 6 equivalent pipeline diameters, so that before the pipeline system turns, the vortex in the airflow has not disappeared, the airflow is still uneven, and it cannot present the typical full turbulence characteristics.

[0004] Figure 2 This is a common arrangement of a blast system in the prior art. To facilitate the hoisting operation during rotor maintenance and bearing replacement, the bend direction of the pipeline system is arranged in the opposite direction to the blast equipment. From the flow field simulation analysis, it can be concluded that the airflow generated by the blast equipment arranged in this way does not fill the entire outlet cross-section of the outlet pipe. There is anisotropic airflow in the outlet pipe, and the length of the pipeline system rarely reaches more than 6 times the equivalent diameter of the pipe. The airflow does not have enough distance to be fully redistributed, resulting in the highest airflow velocity always being on the opposite side of the bend. At this moment, the airflow redistribution will cause a lot of kinetic energy consumption, and at the same time will generate a lot of noise, which will greatly affect the efficiency of wind energy production and transmission of the blast system. Utility Model Content

[0005] The utility model aims to provide a blast system for reducing the kinetic energy loss of airflow, so as to solve the technical problems that the existing blast system has large kinetic energy loss and is prone to generate noise during airflow transmission.

[0006] To solve the above problems, the technical solution of the utility model is: a blast system for reducing the kinetic energy loss of airflow, comprising: blast equipment, air distribution device of air distribution pipe and ventilation duct;

[0007] Setting the direction of the air blowing device toward one side of the air distribution device of the air distribution duct as a first direction;

[0008] The air blowing device comprises a blower body and an air outlet, wherein the blower body and the air outlet are arranged along the first direction, the air flow channel is arranged in a counterclockwise spiral structure, and the angle between the axis extension direction of the air outlet away from the first direction and the horizontal plane is limited to 125° to 145°;

[0009] One end of the ventilation duct is fixedly connected to the air outlet of the blowing device, and the other end of the ventilation duct is fixedly connected to the air inlet end of the air distribution device. The ventilation duct is used to conduct the airflow generated by the blowing device to the air distribution device, and the air inlet end pipe of the air distribution device is kept horizontally extended. The angle between the axis extension direction of the ventilation duct along one side of the first direction and the axis extension direction of the air inlet end pipe of the air distribution device is limited to 125°~145°.

[0010] Preferably, the ventilation duct includes a reducer, a straight pipe and a bent pipe, the two ends of the reducer are respectively connected to the air outlet and the first pipe opening of the straight pipe, and the two ends of the bent pipe are respectively connected to the second pipe opening of the straight pipe and the air inlet end pipe opening of the air distribution device of the air distribution pipe.

[0011] Preferably, the radial dimension of the tube body of the reducer gradually increases along the direction from the air outlet to the straight-through tube, and the diameter change angle of the reducer is limited to 15° to 30°.

[0012] Preferably, the bending angle of the curved pipe is limited to 125° to 145°.

[0013] Preferably, the reducer, the straight-through pipe and the elbow connection surface are fastened to each other by bolts.

[0014] Preferably, a shell is provided outside the blowing device, and the shell adopts a three-Hough type structure.

[0015] Preferably, the three groups of half faces of the blower housing are respectively provided with matching welding flanges, and adjacent half faces are detachably connected by bolts.

[0016] Preferably, the blower body comprises an impeller, and the impeller is configured to rotate counterclockwise along the first direction.

[0017] Preferably, the blower body further comprises a motor, which is drivingly connected to the impeller for driving the impeller to rotate, and the output shaft of the motor is configured to rotate counterclockwise along the first direction.

[0018] Preferably, the air distribution device is provided with a plurality of air branch pipes, and the air branch pipes are used to divert the airflow generated by the blowing equipment, and each of the air branch pipes is provided with a control valve for individually controlling the opening and closing state of the corresponding air branch pipe.

[0019] Due to the adoption of the above technical solution, the utility model has the following advantages and positive effects compared with the prior art:

[0020] (1) The utility model provides a blowing system for reducing the kinetic energy loss of airflow, wherein the main body of the blowing system includes a blowing device and a ventilation duct, and the connection structure between the blowing device and the ventilation duct is further limited so that the airflow channel formed by the blower body and the air outlet is arranged in a counterclockwise spiral structure toward the air distribution device at the rear end, and the angle between the axis extension direction of the air outlet and the horizontal plane is limited to 125°~145°. At the same time, the air inlet end pipe of the air distribution device is kept horizontally arranged, and the bending angle of the elbow connecting the ventilation duct and the air inlet end pipe of the air distribution device is also limited to 125°~145°. Through the improvement of the setting angle of the blowing device and the ventilation duct in the utility model, the airflow vortex at the end of the ventilation duct and the high-speed airflow flow area in the elbow are located on the same side, the airflow pressure loss is minimized, and the kinetic energy loss during the airflow transmission process is greatly reduced. At the same time, through the angle setting, there is no obstruction in the space above the blowing device, which is convenient for the lifting operation of the blowing device when the rotor is inspected and the bearing is replaced.

[0021] (2) The utility model provides a blower system for reducing kinetic energy loss, in which the shell of the blower equipment is reasonably divided and a three-Hough type structure is adopted, so that the shell of the blower equipment can be disassembled into multiple pieces along multiple dividing lines, so as to further improve the convenience of disassembling and lifting the rotor and bearing components during subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a blast system for reducing kinetic energy loss of airflow provided in this embodiment;

[0023] Figure 2 This embodiment provides a schematic structural diagram of a conventional arrangement of an air blowing system.

[0024] Explanation of the reference numerals: 1: blowing equipment; 11: blower body; 12: air outlet; 2: ventilation duct; 21: reducing pipe; 22: straight pipe; 23: elbow pipe; 3: air distribution device for air distribution pipes. DETAILED DESCRIPTION

[0025] The following is a further detailed description of a blast system for reducing kinetic energy loss of airflow proposed by the utility model in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the utility model will become more apparent from the following description and claims.

[0026] See also Figure 1 , this embodiment provides a blowing system for reducing the kinetic energy loss of airflow, thereby improving the efficiency of airflow transmission in the blowing system.

[0027] The main body of the air blowing system provided in this embodiment includes an air blowing device 1, an air branch pipe air distribution device 3 and a ventilation duct 2. The air blowing device 1 includes a blower or a compressor and other equipment that can generate a certain pressure airflow. The air branch pipe air distribution device 3 is used to transmit the airflow to a specific location, such as a combustion chamber, a reactor or an aeration tank. The ventilation duct 2 connects the air blowing device 1 and the air branch pipe air distribution device 3, and is used to guide the airflow from the air blowing device 1 to the air branch pipe air distribution device 3.

[0028] In this embodiment, the observation position of the blast system is defined as follows: Figure 1 As shown in , it can be understood that the air distribution device 3 of the air distribution duct is located on the left side of the observation angle, the blowing device 1 is located on the right side of the observation angle, and the direction of the blowing device 1 toward the side of the air distribution device 3 of the air distribution duct is set as the first direction.

[0029] Specifically, the air blowing device 1 includes a blower body 11 and an air outlet 12, the blower body 11 is connected to the air outlet 12, and an air flow channel is constructed inside the air blowing device 1. The air flow of the air blowing device 1 is generated by the impeller at the center position, and is output from the end of the air outlet 12 through the air flow channel arranged in a spiral structure. In this embodiment, the air flow channel is configured to be arranged in a counterclockwise direction along the first direction, that is, the air flow in the air flow channel is transmitted in a counterclockwise direction. At the same time, in this embodiment, the arrangement angle of the air outlet 12 is further improved, that is, the air outlet 12 is tilted along the first direction, so that the angle between the axis extension direction of the air outlet 12 away from the first direction and the horizontal plane is limited to 125° to 145°, preferably 135°.

[0030] The ventilation duct 2 is a hollow duct, one end of which is fixedly connected to the outlet duct 12 of the air blowing device 1, and the other end of which is fixedly connected to the inlet duct of the air distribution device 3. The air distribution device 3 maintains a horizontally extending air distribution duct, and the ventilation duct 2 is tilted at a certain angle, so that the angle between the axis extension direction of the ventilation duct 2 on one side of the first direction and the axis extension direction of the air distribution device 3 is also limited to 125° to 145°, preferably 135°.

[0031] In summary, this embodiment provides a new air blowing system layout design for reducing airflow kinetic energy loss. Figure 2 In order to facilitate the lifting operation when the rotor is overhauled and the bearing is replaced in the later stage, the conventional air blowing system is basically arranged in a reverse direction between the outlet at the end of the ventilation duct 2 and the air blowing device 1. Regardless of whether the air blowing device 1 is a single-inlet or double-inlet air blowing method, the air flow vortex generated by the air blowing device 1 is located on the opposite side of the high-speed air flow area of ​​the bend 23 in the end of the ventilation duct 2. The final redistribution of the air flow will cause a great energy loss to the kinetic energy of the air flow, greatly affecting the air flow transmission efficiency of the air blowing system, and the air flow collides with the bend 23 at the end of the ventilation duct 2, which will produce a lot of noise.

[0032] Therefore, in view of the shortcomings of the prior art, the present embodiment is improved based on the existing air blowing system. First, the air blowing device 1 is adjusted to face the air distribution device 3 of the air distribution pipe, and the air flow channel of the air blowing device 1 is configured to face the air distribution device 3 of the air distribution pipe in a counterclockwise direction. At this time, although the air flow vortex generated by the air blowing device 1 is on the same side as the air flow high-speed area of ​​the air distribution device 3 in the bend 23, the air outlet 12 of the air blowing device 1 is arranged vertically relative to the ground, which is inconvenient for the lifting operation during the later rotor maintenance and replacement of the bearing. Therefore, in order to further improve the convenience of equipment maintenance in this embodiment, the air blowing device 1 is adjusted. The angle of the air outlet 12 and the arrangement angle of the elbow 23 are further limited, and the angle between the axial extension direction of the air outlet 12 and the horizontal plane is limited to 125°~145°, and the angle between the axial extension direction of the ventilation duct 2 and the axial extension direction of the air inlet end pipe of the air distribution device 3 is also limited to 125°~145°. After theoretical verification and flow field simulation analysis, it can be seen that at this time, the kinetic energy loss and noise generation when the air flow flows through the elbow 23 are minimized, which effectively improves the air flow transmission efficiency of the blowing system. At the same time, the space above the blowing equipment 1 is unobstructed, which is convenient for lifting operations during rotor maintenance and bearing replacement.

[0033] Preferably, a shell is provided on the outside of the air blast device 1. To further solve the problem that the conventional shell setting method in this embodiment will cause inconvenience in lifting operations during later rotor maintenance and bearing replacement, the shell in this embodiment is improved to adopt a three-Hough type structure. Position-matched welding flanges are provided between the three groups of Hough surfaces of the shell of the air blast device 1, and adjacent Hough surfaces are fastened by bolts to achieve a detachable connection. The three-Hough type structural design solves the problem of inconvenience in disassembly caused by the special angle arrangement of the air blast device 1 in this embodiment. The three-Hough type casing allows more flexible installation and maintenance operations, and can be opened or disassembled along multiple dividing lines to facilitate the inspection, cleaning and replacement of the internal components of the air blast device 1.

[0034] Preferably, the ventilation duct 2 is composed of three independent parts, namely, a reducer 21, a straight pipe 22 and a bend 23, which are connected in sequence, wherein the two ends of the reducer 21 are respectively connected to the air outlet 12 and the first pipe opening of the straight pipe 22, the straight pipe 22 is a straight hollow pipe body, and the two ends of the bend 23 are respectively connected to the second pipe opening of the straight pipe 22 and the air inlet end pipe opening of the air distribution device 3 of the air distribution pipe, and the bending angle of the bend 23 is limited to 125° to 145°, thereby realizing the angle setting of the air blowing device 1 and the air distribution device 3 of the air distribution pipe in the connection structure. Specifically, the radial dimension of the pipe body of the reducer 21 gradually increases along the direction from the air outlet 12 to the straight pipe 22, and the diameter change angle of the reducer 21 is limited to 15° to 30°. The reducer 21 makes the air blowing device 1 and the straight pipe 22 adaptable and connected, and can provide a relatively smooth transition, ensuring that the air flow avoids turbulence and unnecessary pressure loss during transmission, and reduces noise generation. At the same time, the connecting surfaces of the reducer 21, the straight pipe 22 and the bent pipe 23 are fastened to each other by bolts, and during the connection process of the reducer 21, the straight pipe 22 and the bent pipe 23, as well as the connection process of the ventilation duct 2 with the air outlet pipe port 12 and the air inlet end pipe port of the air distribution device 3 of the air distribution duct, a sealing component can be set at the connecting end to enhance the air flow transmission sealing effect of the blowing system.

[0035] Preferably, the blower body 11 includes an impeller and a motor, which is drivingly connected to the impeller. The output shaft of the motor rotates to drive the impeller to rotate synchronously, wherein the output shaft of the motor is configured to rotate counterclockwise along a first direction, thereby driving the impeller to rotate counterclockwise along the first direction. Combined with the counterclockwise arrangement direction of the airflow channel in this embodiment, airflow can be generated with maximum efficiency.

[0036] Preferably, the air distribution duct air distribution device 3 is provided with a plurality of air distribution branch pipes, which are used to divert the air flow generated by the blowing equipment 1. The air flow is input from the air inlet end of the air distribution duct air distribution device 3, and flows to different required areas through each air distribution branch pipe. An independent control valve is respectively provided in each air distribution branch pipe for individually controlling the opening and closing state of the air distribution branch pipe, thereby realizing flexible control of the air supply operation of the blowing system.

[0037] The above is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A blast system for reducing kinetic energy loss of airflow, characterized in that: include: Blowing equipment, air distribution devices of air distribution pipes and ventilation ducts; Setting the direction of the air blowing device toward one side of the air distribution device of the air distribution duct as a first direction; The air blowing device comprises a blower body and an air outlet, wherein the blower body and the air outlet are arranged along the first direction, the air flow channel is arranged in a counterclockwise spiral structure, and the angle between the axis extension direction of the air outlet away from the first direction and the horizontal plane is limited to 125°~145°; One end of the ventilation duct is fixedly connected to the air outlet of the blowing device, and the other end of the ventilation duct is fixedly connected to the air inlet end of the air distribution device. The ventilation duct is used to conduct the airflow generated by the blowing device to the air distribution device, and the air inlet end pipe of the air distribution device is kept horizontally extended. The angle between the axis extension direction of the ventilation duct along one side of the first direction and the axis extension direction of the air inlet end pipe of the air distribution device is limited to 125°~145°.

2. The air blowing system for reducing airflow kinetic energy loss according to claim 1, characterized in that: The ventilation duct includes a reducer, a straight pipe and a bent pipe. The two ends of the reducer are respectively connected to the air outlet and the first pipe opening of the straight pipe, and the two ends of the bent pipe are respectively connected to the second pipe opening of the straight pipe and the air inlet end pipe opening of the air distribution device of the air distribution pipe.

3. The air blowing system for reducing kinetic energy loss of airflow according to claim 2, characterized in that: The radial dimension of the reducer gradually increases along the direction from the air outlet to the straight-through pipe, and the diameter change angle of the reducer is limited to 15° to 30°.

4. The air blowing system for reducing airflow kinetic energy loss according to claim 3, characterized in that: The bending angle of the elbow is limited to 125°~145°.

5. The air blowing system for reducing airflow kinetic energy loss according to claim 2, characterized in that: The reducer, the straight-through pipe and the elbow connection surface are fastened to each other by bolts.

6. The air blowing system for reducing kinetic energy loss of airflow according to claim 1, characterized in that: A shell is arranged outside the air blowing device, and the shell adopts a three-harvest type structure.

7. The air blowing system for reducing kinetic energy loss of airflow according to claim 6, characterized in that: Matching welding flanges are provided between the three groups of half faces of the air blast equipment housing, and adjacent half faces are detachably connected by bolts.

8. The air blowing system for reducing kinetic energy loss of airflow according to claim 1, characterized in that: The blower body includes an impeller, and the impeller is configured to rotate counterclockwise along the first direction.

9. The air blowing system for reducing kinetic energy loss of airflow according to claim 8, characterized in that: The blower body also includes a motor, which is drivingly connected to the impeller and is used to drive the impeller to rotate. The output shaft of the motor is configured to rotate counterclockwise along the first direction.

10. The air blowing system for reducing airflow kinetic energy loss according to claim 1, characterized in that: The air distribution device is provided with a plurality of air branch pipes, and the air branch pipes are used to divert the airflow generated by the blowing equipment, and each of the air branch pipes is provided with a control valve for individually controlling the opening and closing state of the corresponding air branch pipe.

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