Negative pressure centrifugal blower

Abstract

This utility model relates to the field of centrifugal blowers, and more particularly to a negative pressure centrifugal blower, including a base; it also includes a drive shaft, adjusting grooves, adjusting blocks, screw holes, positioning screws, and blades. A protective plate is installed on the right side of the upper surface of the base, and a housing is installed on the left side of the protective plate. A mounting platform is provided on the left side of the housing on the upper surface of the base. A drive shaft is inserted and rotatably connected to the center of the left side of the housing. Five circumferentially distributed adjusting grooves are provided on the right end of the outer surface of the drive shaft. This utility model, by setting the adjusting grooves and adjusting blocks, can achieve flexible installation between the blades and the drive shaft, thereby facilitating the adjustment of the blade angle by rotating the adjusting blocks, thus achieving the adjustment of the wind speed. After rotating the adjusting blocks, the position of the adjusting blocks can be fixed by tightening the positioning screws to prevent loosening during operation and causing the blades to fall off.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal blowers, and in particular to a negative pressure centrifugal blower. Background Technology

[0002] A negative pressure centrifugal blower is a device that uses centrifugal force to draw gas from the end of a system and discharge it to the front of the system. It is usually used in situations where negative pressure needs to be generated, such as in ventilation, dust removal and cooling systems. The working principle of a negative pressure centrifugal blower is similar to that of an ordinary centrifugal blower. Both use a high-speed rotating impeller to accelerate the gas, then decelerate and change its flow direction, so that kinetic energy is converted into potential energy.

[0003] The existing negative pressure centrifugal blowers cannot rotate their blades during operation, which means that the blower can only adjust the airflow by changing its rotation speed, and cannot control the airflow by adjusting the blade angle according to actual needs.

[0004] Therefore, to address the problem that existing negative pressure centrifugal blowers cannot rotate their blades during operation, resulting in the blower only being able to adjust the wind speed by adjusting the rotation speed and unable to control the wind speed according to actual needs by adjusting the blade angle, a negative pressure centrifugal blower can be designed. By setting an adjustment groove and an adjustment block, flexible installation between the blades and the drive shaft can be achieved. This allows for easy adjustment of the blade angle by rotating the adjustment block, thereby adjusting the wind speed. After rotating the adjustment block, the position of the adjustment block can be fixed by tightening the positioning screw to prevent loosening during operation and causing the blades to fall off. Utility Model Content

[0005] To overcome the problem that existing negative pressure centrifugal blowers cannot rotate their blades during operation, resulting in the blower only being able to adjust the wind speed by adjusting the rotation speed, and thus being unable to control the wind speed by adjusting the blade angle according to actual needs.

[0006] The technical solution of this utility model is as follows: a negative pressure centrifugal blower, including a base; it also includes a drive shaft, adjusting grooves, adjusting blocks, screw holes, positioning screws, and blades. A protective plate is installed on the right side of the upper surface of the base, and a housing is installed on the left side of the protective plate. An installation platform is set on the left side of the housing on the upper surface of the base. A drive shaft is inserted and rotatably connected to the center of the left side of the housing. Five circumferentially distributed adjusting grooves are opened at the right end of the outer surface of the drive shaft. Adjusting blocks are engaged inside the adjusting grooves. Screw holes are opened through the edge of the outer surface of the adjusting blocks. Positioning screws are installed on the outer surface of the adjusting blocks. The adjusting blocks are fixed to the drive shaft by the positioning screws. Blades are installed on the outer surface of the adjusting blocks.

[0007] Preferably, by setting an adjustment groove and an adjustment block, flexible installation between the blades and the drive shaft can be achieved. This allows for easy adjustment of the blade angle by rotating the adjustment block, thereby adjusting the wind speed. After rotating the adjustment block, the position of the adjustment block can be fixed by tightening the positioning screw, preventing loosening during operation and causing the blades to fall off. This solves the problem that existing negative pressure centrifugal blowers cannot rotate their blades during use, resulting in the blower only being able to adjust the wind speed by adjusting the rotation speed, and unable to control the wind speed according to actual needs by adjusting the blade angle.

[0008] Preferably, two symmetrical bearing seats are installed on the upper surface of the mounting platform, and the drive shaft is rotatably connected to the bearing seats through it.

[0009] Preferably, a drive motor is installed on the front side of the upper surface of the base, and the output end of the drive motor and the left end of the drive shaft are both connected to drive wheels, with belts fitted on the outer sides of the two drive wheels.

[0010] Preferably, the upper surface of the mounting base of the drive motor is provided with multiple fixing bolts, and the drive motor is fixed to the base by the fixing bolts.

[0011] Preferably, the bottom surface of the base is provided with an anti-slip pad, which is made of rubber.

[0012] Preferably, a mounting frame is embedded in the right side surface of the housing, and a dustproof mesh is provided on the inner surface of the mounting frame.

[0013] Preferably, the blades and the adjusting block are fixed together by welding.

[0014] The beneficial effects of this utility model are:

[0015] 1. By setting an adjustment slot and adjustment block, flexible installation between the blades and the drive shaft can be achieved. This allows for easy adjustment of the blade angle by rotating the adjustment block, thereby adjusting the wind speed. After rotating the adjustment block, the position of the adjustment block can be fixed by tightening the positioning screw, preventing loosening during operation and blade detachment. This solves the problem that existing negative pressure centrifugal blowers cannot rotate their blades, causing the blower to rely solely on adjusting the rotation speed to regulate the wind speed, and cannot control the wind speed according to actual needs by adjusting the blade angle. Attached Figure Description

[0016] Figure 1 The diagram shown is a three-dimensional structural schematic of a negative pressure centrifugal blower according to this utility model.

[0017] Figure 2 The diagram shown is a three-dimensional structural schematic of a negative pressure centrifugal blower drive shaft according to this utility model.

[0018] Figure 3 The diagram shown is a three-dimensional structural schematic of the regulating tank of a negative pressure centrifugal blower according to this utility model.

[0019] Figure 4 The diagram shown is a three-dimensional structural schematic of a negative pressure centrifugal blower regulating block according to this utility model.

[0020] Explanation of reference numerals in the attached drawings: 1. Base; 2. Protective plate; 3. Housing; 4. Mounting platform; 5. Drive shaft; 6. Adjustment groove; 7. Adjustment block; 8. Screw hole; 9. Positioning screw; 10. Blade; 11. Bearing housing; 12. Drive motor; 13. Drive wheel; 14. Belt; 15. Fixing bolt; 16. Anti-slip pad; 17. Mounting frame; 18. Dustproof net. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Please see Figures 1-4 This utility model provides an embodiment: a negative pressure centrifugal blower, including a base 1; it also includes a drive shaft 5, adjusting grooves 6, adjusting blocks 7, screw holes 8, positioning screws 9, and blades 10. A protective plate 2 is installed on the right side of the upper surface of the base 1, and a housing 3 is installed on the left side of the protective plate 2. A mounting platform 4 is provided on the upper surface of the base 1 on the left side of the housing 3. The drive shaft 5 is inserted and rotatably connected to the center of the left side of the housing 3. Five circumferentially distributed adjusting grooves 6 are opened on the right end of the outer surface of the drive shaft 5. Adjusting blocks 7 are engaged inside the adjusting grooves 6. The outer surface of the adjusting blocks 7... A screw hole 8 is provided through the edge. A positioning screw 9 is installed on the outer surface of the adjusting block 7. The adjusting block 7 is fixed to the drive shaft 5 by the positioning screw 9. A blade 10 is installed on the outer surface of the adjusting block 7. By setting the adjusting groove 6 and the adjusting block 7, the blade 10 and the drive shaft 5 can be flexibly installed. This allows the angle of the blade 10 to be adjusted by rotating the adjusting block 7, thereby adjusting the wind speed. After rotating the adjusting block 7, the position of the adjusting block 7 can be fixed by tightening the positioning screw 9 to prevent the blade 10 from falling off during operation.

[0023] Please see Figures 1-4In this embodiment, two symmetrical bearing seats 11 are installed on the upper surface of the mounting platform 4. The transmission shaft 5 is rotatably connected to the bearing seats 11. By setting the bearing seats 11, the rotational stability of the transmission shaft 5 can be improved, thereby increasing the service life of the device. A drive motor 12 is installed on the front side of the upper surface of the base 1. The output end of the drive motor 12 and the left end of the transmission shaft 5 are both connected to transmission wheels 13. Belts 14 are sleeved on the outer sides of the two transmission wheels 13. By setting the drive motor 12, its output end can drive the transmission wheel 13 connected to it to rotate during operation. In this way, with the cooperation of the belt 14, it drives the other transmission wheel 13 and the transmission shaft 5 to rotate. Multiple fixing bolts 15 are set on the upper surface of the mounting base of the drive motor 12. The drive motor 12 is fixed to the base 1 by the fixing bolts 15. By setting the fixing bolts 15, the fixing effect of the drive motor 12 can be improved, and it is also convenient for the staff to disassemble and repair the drive motor 12.

[0024] Please see Figures 1-4 In this embodiment, an anti-slip pad 16 is provided on the bottom surface of the base 1. The anti-slip pad 16 is made of rubber. By providing the anti-slip pad 16, the anti-slip effect of the bottom of the device can be improved, and it also has a certain cushioning performance, which can improve the overall stability of the device during use. An installation frame 17 is embedded in the right side surface of the housing 3. A dustproof net 18 is provided on the inner surface of the installation frame 17. By providing the dustproof net 18, dust can be blocked during device operation, preventing dust from entering the housing 3 and causing equipment aging. The blade 10 and the adjusting block 7 are fixed by welding. By fixing the blade 10 and the adjusting block 7 by welding, the connection strength between the blade 10 and the adjusting block 7 can be improved, avoiding the problem of loosening under long-term rotation.

[0025] During operation, the bearing housing 11 improves the stability of the rotation of the transmission shaft 5, thereby extending the service life of the device. The drive motor 12 drives the connected transmission wheel 13 to rotate during operation, which, in conjunction with the belt 14, drives another transmission wheel 13 and the transmission shaft 5 to rotate. The fixing bolts 15 improve the fixing effect of the drive motor 12 and facilitate the disassembly and maintenance of the drive motor 12. The rubber anti-slip pads 16 improve the anti-slip effect of the bottom of the device and provide a certain cushioning performance, thereby improving the overall stability of the device during use. The dustproof net 18 blocks dust during operation, preventing dust from entering the casing 3 and causing equipment aging. The blades 10 and the adjusting block 7 are fixed by welding, ensuring a high connection strength between the blades 10 and the adjusting block 7 and preventing loosening during long-term rotation.

[0026] Through the above steps, by setting the adjustment groove 6 and the adjustment block 7, the blade 10 and the drive shaft 5 can be flexibly installed. This allows the angle of the blade 10 to be adjusted by rotating the adjustment block 7, thereby adjusting the wind speed. After rotating the adjustment block 7, the position of the adjustment block 7 can be fixed by tightening the positioning screw 9, preventing the blade 10 from falling off during operation. This solves the problem that the blade 10 of the existing negative pressure centrifugal blower cannot be rotated during use, which means that the blower can only adjust the wind speed by adjusting the rotation speed, and cannot control the wind speed by adjusting the blade 10 angle according to actual needs.

Claims

1. A negative pressure centrifugal blower, comprising a base (1); characterized in that: It also includes a drive shaft (5), an adjustment groove (6), an adjustment block (7), a screw hole (8), a positioning screw (9), and a blade (10). A protective plate (2) is installed on the right side of the upper surface of the base (1), and a housing (3) is installed on the left side of the protective plate (2). An installation platform (4) is set on the upper surface of the base (1) on the left side of the housing (3). A drive shaft (5) is inserted and rotatably connected at the center of the left side of the housing (3). Five circumferentially distributed adjustment grooves (6) are opened at the right end of the outer surface of the drive shaft (5). An adjustment block (7) is engaged inside the adjustment groove (6). A screw hole (8) is opened through the edge of the outer surface of the adjustment block (7). A positioning screw (9) is installed on the outer surface of the adjustment block (7). The adjustment block (7) is fixed to the drive shaft (5) by the positioning screw (9). A blade (10) is installed on the outer surface of the adjustment block (7).

2. The negative pressure centrifugal blower according to claim 1, characterized in that: Two symmetrical bearing seats (11) are installed on the upper surface of the mounting platform (4), and the drive shaft (5) is rotatably connected to the bearing seats (11).

3. A negative pressure centrifugal blower according to claim 1, characterized in that: A drive motor (12) is installed on the front side of the upper surface of the base (1). The output end of the drive motor (12) and the left end of the drive shaft (5) are both connected to drive wheels (13). Belts (14) are sleeved on the outer sides of the two drive wheels (13).

4. A negative pressure centrifugal blower according to claim 3, characterized in that: The upper surface of the mounting base of the drive motor (12) is provided with multiple fixing bolts (15), and the drive motor (12) is fixed to the base (1) by the fixing bolts (15).

5. A negative pressure centrifugal blower according to claim 1, characterized in that: The bottom surface of the base (1) is provided with an anti-slip pad (16), which is made of rubber.

6. A negative pressure centrifugal blower according to claim 1, characterized in that: A mounting frame (17) is embedded in the right side surface of the housing (3), and a dustproof net (18) is provided on the inner surface of the mounting frame (17).

7. A negative pressure centrifugal blower according to claim 1, characterized in that: The blade (10) and the adjusting block (7) are fixed together by welding.

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