Double-motor direct-drive synchronous transmission gearless roots blower

Abstract

The utility model provides a kind of double-motor direct-drive synchronous transmission toothless Roots blower, it includes fan casing, left wallboard and right wallboard, the inside of fan casing is equipped with first impeller shaft and second impeller shaft, first impeller shaft and second impeller shaft are respectively rotated and connected with left wallboard and right wallboard by bearing, the right side of first impeller shaft is equipped with first motor, first motor can drive first impeller shaft synchronous rotation, the left side of second impeller shaft is equipped with second motor, second motor can drive second impeller shaft synchronous rotation, first motor and second motor can be rotated synchronously by PLC control, left wallboard and right wallboard are respectively located in the axial inside position of corresponding bearing and are equipped with exhaust hole, the inside of exhaust hole is communicated with working chamber, the outside of exhaust hole is communicated with external air.The fan is simplified by whole structure, production cost is reduced, and, it uses double-motor direct-drive mode, impeller rotation precision is obviously improved.The utility model can be widely applied to Roots blower.

Description

Technical Field

[0001] This utility model relates to a Roots blower, and more particularly to a dual-motor direct-drive synchronous transmission gearless Roots blower. Background Technology

[0002] Existing Roots blowers generally consist of a blower casing, wall panels, impeller, gears, oil tank, etc. The motor drives the active impeller to rotate, and the active impeller drives the driven impeller to rotate in the opposite direction synchronously through gear meshing, thereby realizing the gas transport.

[0003] To further simplify the overall structure of the Roots blower, improve the impeller rotation accuracy, and reduce production costs, this utility model provides a dual-motor direct-drive synchronous transmission gearless Roots blower. Utility Model Content

[0004] This utility model addresses the above-mentioned technical problems by providing a dual-motor direct-drive synchronous transmission gearless Roots blower. This Roots blower eliminates the traditional gear set, expansion sleeve, main oil tank, auxiliary oil tank, and other structural designs, further simplifying the structure of the Roots blower and reducing production costs. Furthermore, the dual-motor direct-drive transmission method significantly improves the impeller rotation accuracy and increases the blower's operating efficiency.

[0005] Therefore, the technical solution of this utility model is a dual-motor direct-drive synchronous transmission gearless Roots blower, which includes a blower housing, a left wall plate and a right wall plate. The left wall plate and the right wall plate are fixedly connected to the left and right ends of the blower housing, respectively. A sealed working chamber is formed between the blower housing and the left and right wall plates. The working chamber is provided with a first impeller shaft and a second impeller shaft. Impellers are respectively provided on the outer circumference of the first impeller shaft and the second impeller shaft at the position of the working chamber.

[0006] One end of the fan casing is provided with an air inlet, and the other end of the fan casing is provided with an air outlet. The air inlet and the air outlet are respectively connected to the working chamber.

[0007] The upper and lower sections of the left and right wall panels are respectively provided with through holes. The left and right ends of the first impeller shaft are located inside the through holes in the upper sections of the left and right wall panels, respectively, and are rotatably supported and connected to the left and right wall panels through the second bearing and the first bearing, respectively. The left and right ends of the second impeller shaft are located inside the through holes in the lower sections of the left and right wall panels, respectively, and are rotatably supported and connected to the left and right wall panels through the third bearing and the fourth bearing, respectively. The first impeller shaft and the second impeller shaft are arranged parallel to each other.

[0008] A first motor is located on the right side of the first impeller shaft. The first motor is directly driven by the first impeller shaft and can drive the first impeller shaft to rotate synchronously. A second motor is located on the left side of the second impeller shaft. The second motor is directly driven by the second impeller shaft and can drive the second impeller shaft to rotate synchronously. The first motor and the second motor can be controlled to rotate synchronously by a PLC.

[0009] The impellers of the toothless Roots blower are directly driven synchronously by the first motor and the second motor respectively, omitting the synchronous gear transmission;

[0010] The left end of the left wall panel is provided with a first bearing cover located outside the second bearing. The first bearing cover is sealed and fixed to the left wall panel. The right end of the right wall panel is provided with a second bearing cover located outside the fourth bearing. The second bearing cover is sealed and fixed to the right wall panel.

[0011] Exhaust holes are provided on the left and right wall panels at the axial inner positions of the first, second, third, and fourth bearings, respectively. The inner ports of the multiple exhaust holes are connected to the working chamber, and the outer ports of the multiple exhaust holes are connected to the outside air. The outer ports of the multiple exhaust holes can be connected to external pipelines for directional gas discharge.

[0012] Preferably, the first impeller shaft and the first motor are connected by a first coupling. The outer circumference of the first coupling is provided with a first coupling housing. The left side of the first coupling housing is fixedly connected to the right wall plate, and the right side of the first coupling housing is fixedly connected to the housing of the first motor.

[0013] The second impeller shaft and the second motor are connected by a second coupling. The outer circumference of the second coupling is provided with a second coupling housing. The right side of the second coupling housing is fixedly connected to the left wall plate, and the left side of the second coupling housing is fixedly connected to the housing of the second motor.

[0014] Preferably, the first bearing, the second bearing, the third bearing, and the fourth bearing are all double-row radial thrust bearings, and the four double-row radial thrust bearings are equipped with bearing sealing caps.

[0015] Preferably, a first adjusting shim is provided between the right end of the second bearing and the adjacent end of the left wall plate, and a second adjusting shim is provided between the fourth bearing and the right wall plate.

[0016] Preferably, the first motor and the second motor are servo motors.

[0017] Preferably, the housing of the first coupling is fixed to the right wall plate by a pin hole, and the first motor is positioned relative to the housing of the first coupling by the outer ring surface of the front end of its housing;

[0018] The second coupling housing is fixed to the left wall plate by a pin hole, and the second motor is positioned relative to the second coupling housing by the outer ring surface at the front end of its housing.

[0019] The beneficial effects of this utility model are:

[0020] 1. Since both the first and second motors are servo motors, a dual-servo motor direct drive transmission method is adopted. Each impeller shaft is equipped with one servo motor. After the blower is powered on, the two servo motors are controlled to rotate through the PLC program to adjust the blade clearance between the two impellers, so that the blade clearance between the two impellers is kept at the set size, completing the calibration work before operation. Subsequently, the two servo motors rotate synchronously, driving the two impellers to rotate synchronously, and entering the normal working state. This calibration operation can effectively avoid collision and wear between the two impellers during blower operation.

[0021] Furthermore, since servo motors are more suitable for applications with high requirements for position and speed, such as blowers, CNC machine tools, and automated production lines, servo motors are equipped with servo systems that can sense the position and speed of the motor in real time and make automatic adjustments based on feedback information, resulting in faster response speeds and further improving the rotational accuracy of the impeller.

[0022] 2. By providing exhaust holes on the axial inner sides of the first, second, third, and fourth bearings on the left and right wall panels respectively, with the inner ports of the multiple exhaust holes communicating with the working chamber and the outer ports communicating with the outside air, and by providing exhaust holes on the left and right wall panels respectively, during the operation of the blower, a small portion of the gas in the working chamber is continuously discharged outward through the exhaust holes under pressure. The process of the gas being discharged outward will continuously carry away the heat in the working chamber, resulting in a significant cooling effect. This cooling process does not require an external heat dissipation device and does not require electrical operation, further reducing investment costs.

[0023] Furthermore, due to the significant water mist that accumulates inside the working chamber during prolonged gas transmission, and the pressure within the chamber causing the water mist to flow, this flowing water mist can easily corrode the inner walls, bearings, servo motors, and other related components, reducing their lifespan and increasing maintenance costs. Therefore, exhaust vents are provided on both the left and right wall panels, located inside the bearings on both panels. During operation, as gas continuously exits the chamber through these vents, the water mist also exits with the gas, ensuring timely removal of the water mist and preventing corrosion of the blower's components. The exhaust vents are typically circular or polygonal, with a diameter of approximately [mm]. This small diameter does not affect the normal gas transmission or operating efficiency of the blower.

[0024] Meanwhile, since the outer ports of multiple exhaust ports can be connected to external pipelines for directional gas discharge, when transporting special gases, in order to avoid gas leakage into the external environment and causing pollution, the discharged gas can be diverted to a designated area through external pipelines. Attached Figure Description

[0025] Figure 1 This is a perspective view of the utility model;

[0026] Figure 2 This is a perspective view of the present invention from another angle;

[0027] Figure 3 This utility model relates to a partial sectional view of the right wall panel;

[0028] Figure 4 This is a cross-sectional view of the two sides of the fan housing in this utility model;

[0029] Figure 5 This is a utility model Figure 4 Enlarged view of point A in the middle;

[0030] Figure 6 This is a utility model Figure 3 Enlarged view at point B in the middle;

[0031] Figure 7 This is a utility model Figure 4 Enlarged view of point C in the middle.

[0032] Explanation of symbols in the diagram:

[0033] 1. Fan casing; 2. Left wall panel; 3. Right wall panel; 4. First impeller shaft; 5. Second impeller shaft; 6. First bearing; 7. First coupling housing; 8. First motor; 9. First coupling; 10. Second bearing; 11. First bearing cover; 12. First adjusting shim; 13. Third bearing; 14. Second coupling housing; 15. Second motor; 16. Second coupling; 17. Fourth bearing; 18. Second bearing cover; 19. Second adjusting shim; 20. Bearing sealing cover; 21. Assembly hole; 22. Exhaust hole. Detailed Implementation

[0034] The present invention will be further described below with reference to the embodiments.

[0035] pass Figures 1-7 As can be seen, the dual-motor direct-drive synchronous transmission gearless Roots blower includes a blower housing 1, a left wall plate 2, and a right wall plate 3. The left wall plate 2 and the right wall plate 3 are fixedly connected to the left and right ends of the blower housing 1, respectively. A sealed working chamber is formed between the blower housing 1 and the left wall plate 2 and the right wall plate 3. The working chamber is equipped with a first impeller shaft 4 and a second impeller shaft 5. Impellers are respectively provided on the outer circumference of the first impeller shaft 4 and the second impeller shaft 5 at the position of the working chamber. The impellers are double-blade impellers or three-blade impellers.

[0036] One end of the fan housing 1 is provided with an air inlet, and the other end of the fan housing 1 is provided with an air outlet. The air inlet and the air outlet are respectively connected to the working chamber.

[0037] The upper and lower sections of the left wall panel 2 and the right wall panel 3 are respectively provided with through holes. The left and right ends of the first impeller shaft 4 are located inside the through holes in the upper sections of the left wall panel 2 and the right wall panel 3, respectively, and are rotatably supported and connected to the left wall panel 2 and the right wall panel 3 through the second bearing 10 and the first bearing 6, respectively. The left and right ends of the second impeller shaft 5 are located inside the through holes in the lower sections of the left wall panel 2 and the right wall panel 3, respectively, and are rotatably supported and connected to the left wall panel 2 and the right wall panel 3 through the third bearing 13 and the fourth bearing 17, respectively. The first impeller shaft 4 and the second impeller shaft 5 are arranged parallel to each other.

[0038] A first motor 8 is provided on the right side of the first impeller shaft 4. The first motor 8 is directly driven by the first impeller shaft 4, and the first motor 8 can drive the first impeller shaft 4 to rotate synchronously. A second motor 15 is provided on the left side of the second impeller shaft 5. The second motor 15 is directly driven by the second impeller shaft 5, and the second motor 15 can drive the second impeller shaft 5 to rotate synchronously. The first motor 8 and the second motor 15 can be controlled to rotate synchronously by a PLC.

[0039] The impeller of the toothless Roots blower is directly driven synchronously by the first motor 8 and the second motor 15, eliminating the need for synchronous gear transmission. Traditional gear drives rely on lubricating oil for continuous lubrication, while direct motor drive eliminates the need for lubricating oil or grease, avoiding the risk of lubricating oil leakage and reducing maintenance frequency and investment costs.

[0040] Furthermore, traditional gear transmission suffers from mechanical friction and energy loss, while direct-drive motors to the impeller shaft have almost no intermediate losses, resulting in a significant improvement in transmission efficiency. Servo motors can directly output the required torque through vector control or PID algorithms, avoiding torque fluctuations in gear transmissions, making them particularly suitable for applications with variable operating conditions.

[0041] The left end of the left wall panel 2 is provided with a first bearing cover 11 located outside the second bearing 10. The first bearing cover 11 is sealed and fixed to the left wall panel 2. The right end of the right wall panel 3 is provided with a second bearing cover 18 located outside the fourth bearing 17. The second bearing cover 18 is sealed and fixed to the right wall panel 3.

[0042] Exhaust holes 22 are provided on the left wall panel 2 and the right wall panel 3 at the axial inner positions of the first bearing 6, the second bearing 10, the third bearing 13, and the fourth bearing 17, respectively. The inner ports of the multiple exhaust holes 22 are connected to the working chamber, and the outer ports of the multiple exhaust holes 22 are connected to the outside air. By setting exhaust holes 22 on the left wall panel 2 and the right wall panel 3 respectively, and the exhaust holes 22 are connected to the working chamber, during the operation of the blower, a small part of the gas in the working chamber is continuously discharged outward through the exhaust holes 22 under pressure. The process of the gas being discharged outward will continuously carry away the heat in the working chamber, which will play a significant cooling role. This cooling process does not require an external heat dissipation device, nor does it require power operation, further reducing the investment cost.

[0043] Furthermore, during prolonged gas transmission, noticeable water mist will appear inside the working chamber of the blower. Due to the pressure inside the chamber during gas transmission, the water mist flows under pressure, which can easily corrode the inner wall of the chamber, bearings, servo motors, and other related components, reducing their service life and increasing maintenance costs. Therefore, exhaust holes 22 are provided on the left wall plate 2 and right wall plate 3, respectively, located inside the bearings on the left and right wall plates. During blower operation, as the gas inside the chamber is continuously discharged through the exhaust holes, the water mist inside the chamber will also be discharged through the exhaust holes, ultimately achieving timely removal of the water mist and preventing corrosion of related components on the blower. The exhaust holes 22 are typically circular or polygonal, with a diameter of approximately 10mm. This small diameter will not affect the normal gas transmission of the blower or its operating efficiency.

[0044] The outer ports of multiple exhaust ports 22 can be connected to external pipelines for directional gas discharge. When transporting special gases, in order to avoid gas leakage into the external environment and causing pollution, the discharged gas can be diverted to a designated area through external pipelines.

[0045] In one specific embodiment, the first impeller shaft 4 and the first motor 8 are connected by a first coupling 9. The outer circumference of the first coupling 9 is provided with a first coupling housing 7. The left side of the first coupling housing 7 is fixedly connected to the right wall plate 3, and the right side of the first coupling housing 7 is fixedly connected to the housing of the first motor 8. The second impeller shaft 5 and the second motor 15 are connected by a second coupling 16. The outer circumference of the second coupling 16 is provided with a second coupling housing 14. The right side of the second coupling housing 14 is fixedly connected to the left wall plate 2, and the left side of the second coupling housing 14 is fixedly connected to the housing of the second motor 15.

[0046] Using separately designed first coupling housing 7 and second coupling housing 14 to fix the first motor 8 to the right wall plate 3 and the second motor 15 to the left wall plate 2, compared with the first coupling housing 7 and the second coupling housing 14 being integrated with the right wall plate 3 and the left wall plate 2 respectively, reduces the processing difficulty of parts, makes processing convenient and quick, and reduces the production cost of parts. At the same time, it is also convenient to disassemble and assemble the corresponding couplings and motors 8, increasing the convenience of installation and maintenance.

[0047] In one specific embodiment, the first bearing 6, the second bearing 10, the third bearing 13, and the fourth bearing 17 are all double-row radial thrust bearings. The four double-row radial thrust bearings are equipped with bearing sealing caps 20. The double-row radial thrust bearings are dustproof and maintenance-free bearings, which do not require additional lubrication with lubricating oil or grease, thus reducing the operating cost of the Roots blower.

[0048] In one specific embodiment, a first adjusting shim 12 is provided between the right end of the second bearing 10 and the adjacent end of the left wall plate 2, and a second adjusting shim 19 is provided between the fourth bearing 17 and the right wall plate 3. This design changes the bearing positioning side of the Roots blower from the original gear side to the non-motor side. The gap between the impeller end face and the wall plate is adjusted by changing the thickness of the first adjusting shim 12 and the second adjusting shim 19, which is convenient and quick to operate.

[0049] In one specific embodiment, both the first motor 8 and the second motor 15 are servo motors, and a dual servo motor direct drive transmission method is adopted. Each impeller shaft is equipped with a servo motor. After the blower is powered on, the two servo motors are controlled to rotate by the PLC program to adjust the blade clearance between the two impellers, so that the blade clearance between the two impellers is kept at the set size, and the pre-operation calibration work is completed. Subsequently, the two servo motors rotate synchronously, driving the two impellers to rotate synchronously, and enter the normal operating state. This calibration operation can effectively avoid collision and wear between the two impellers during blower operation.

[0050] Furthermore, since servo motors are more suitable for applications with high requirements for position and speed, such as blowers, CNC machine tools, and automated production lines, servo motors are equipped with servo systems that can sense the position and speed of the motor in real time and make automatic adjustments based on feedback information, resulting in faster response speeds and further improving the rotational accuracy of the impeller.

[0051] In one specific embodiment, the first coupling housing 7 is fixed to the right wall plate 3 by a pin hole, the first motor 8 is positioned relative to the first coupling housing 7 by the outer ring surface of the front end of its housing, the second coupling housing 14 is fixed to the left wall plate 2 by a pin hole, and the second motor 15 is positioned relative to the second coupling housing 14 by the outer ring surface of the front end of its housing, thereby enabling the first motor 8 and the first impeller shaft 4, as well as the second motor 15 and the second impeller shaft 5, to achieve coaxiality.

[0052] The bottom ends of the fan housing 1, left wall panel 2, and right wall panel 3 are respectively provided with assembly holes 21 for assembling and fixing the fan.

[0053] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A dual-motor direct-drive synchronous transmission gearless Roots blower, characterized in that: The device includes a fan housing, a left wall panel, and a right wall panel. The left wall panel and the right wall panel are fixedly connected to the left and right ends of the fan housing, respectively. The fan housing, the left wall panel, and the right wall panel form a sealed working chamber. The working chamber is equipped with a first impeller shaft and a second impeller shaft. Impellers are respectively provided on the outer circumference of the first impeller shaft and the second impeller shaft at the position of the working chamber. One end of the fan housing is provided with an air inlet, and the other end of the fan housing is provided with an air outlet. The air inlet and the air outlet are respectively connected to the working chamber. The upper and lower sections of the left and right wall panels are respectively provided with through holes. The left and right ends of the first impeller shaft are located inside the through holes in the upper sections of the left and right wall panels, respectively, and are rotatably supported and connected to the left and right wall panels through the second bearing and the first bearing, respectively. The left and right ends of the second impeller shaft are located inside the through holes in the lower sections of the left and right wall panels, respectively, and are rotatably supported and connected to the left and right wall panels through the third bearing and the fourth bearing, respectively. The first and second impeller shafts are arranged parallel to each other. A first motor is provided on the right side of the first impeller shaft, and the first motor directly drives the first impeller shaft to rotate synchronously. A second motor is provided on the left side of the second impeller shaft, and the second motor directly drives the second impeller shaft to rotate synchronously. The first and second motors can be controlled to rotate synchronously by a PLC. The impellers of the toothless Roots blower are directly driven synchronously by the first motor and the second motor, respectively, omitting the synchronous gear transmission; The left end of the left wall panel is provided with a first bearing cover located outside the second bearing. The first bearing cover is sealed and fixed to the left wall panel. The right end of the right wall panel is provided with a second bearing cover located outside the fourth bearing. The second bearing cover is sealed and fixed to the right wall panel. The left and right wall panels are provided with exhaust holes located on the axial inner side of the first, second, third, and fourth bearings, respectively. The inner ports of the multiple exhaust holes are connected to the working chamber, and the outer ports of the multiple exhaust holes are connected to the external air. The outer ports of the multiple exhaust holes can be connected to external pipelines for directional gas discharge.

2. The dual-motor direct-drive synchronous transmission gearless Roots blower according to claim 1, characterized in that: The first impeller shaft is connected to the first motor via a first coupling. The outer circumference of the first coupling is provided with a first coupling housing. The left side of the first coupling housing is fixedly connected to the right wall plate, and the right side of the first coupling housing is fixedly connected to the housing of the first motor. The second impeller shaft is connected to the second motor via a second coupling. The outer circumference of the second coupling is provided with a second coupling housing. The right side of the second coupling housing is fixedly connected to the left wall plate, and the left side of the second coupling housing is fixedly connected to the housing of the second motor.

3. The dual-motor direct-drive synchronous transmission gearless Roots blower according to claim 2, characterized in that: The first coupling housing is fixed to the right wall panel by a pin hole, and the first motor is positioned relative to the first coupling housing by the outer ring surface at the front end of its housing. The second coupling housing is fixed to the left wall plate by a pin hole, and the second motor is positioned relative to the second coupling housing by the outer ring surface at the front end of its housing.

4. The dual-motor direct-drive synchronous transmission gearless Roots blower according to claim 1, characterized in that: The first bearing, the second bearing, the third bearing, and the fourth bearing are all double-row radial thrust bearings, and each of the four double-row radial thrust bearings is equipped with a bearing sealing cap.

5. The dual-motor direct-drive synchronous transmission gearless Roots blower according to claim 1, characterized in that: A first adjusting shim is provided between the right end of the second bearing and the adjacent end of the left wall plate, and a second adjusting shim is provided between the fourth bearing and the right wall plate.

6. The dual-motor direct-drive synchronous transmission gearless Roots blower according to claim 1, characterized in that: The first motor and the second motor are servo motors.

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