Method for adjusting the blade gap of a screw blower impeller

Abstract

The present application provides a kind of screw blower impeller blade clearance adjustment method, the method is by second gear with female rotor impeller shaft locking fixed, and first gear can be rotated relative to male rotor impeller shaft, and, one end of baffle is fixedly connected with the outside end of gear end of male rotor impeller shaft, one end of dial gauge fixed rod is fixedly connected with the outside end of first gear, dial gauge is installed on the other end of dial gauge fixed rod, the needle of dial gauge is contacted with the other end of baffle, when operating, the gap between two impellers is measured and adjusted by rotating first gear, measurement efficiency is high, measurement accuracy is high, can satisfy high-precision measurement demand.The present application can be widely applied to screw blower.

Description

Technical Field

[0001] This invention relates to a screw blower, and more particularly to a method for adjusting the impeller blade clearance of a screw blower. Background Technology

[0002] A screw blower is a device that uses twin screw rotors rotating in a closed cavity to compress and transport gas. It features high efficiency, energy saving, and stability, and is widely used in sewage treatment, pneumatic conveying, and other fields.

[0003] To ensure the stability of screw blower operation, there are strict standards for the blade clearance between the impellers on the two rotors. If the blade clearance is too small, it will cause mutual wear between the impellers during rotation. If the blade clearance is too large, it will cause unstable blower operating pressure.

[0004] Currently, the method for adjusting blade clearance mostly uses feeler gauge measurement. However, due to the relatively narrow measurement position, it is difficult to place the feeler gauge, resulting in low measurement efficiency. Furthermore, the measurement dimensional error is relatively large and the accuracy is low, which cannot meet the precision requirements. Summary of the Invention

[0005] To address the above-mentioned technical problems, this invention provides a method for adjusting the impeller blade clearance of a screw blower. This method eliminates the need for feeler gauge measurement, resulting in high measurement efficiency, simple and quick operation, and high measurement accuracy, thus meeting the required measurement precision.

[0006] Therefore, the technical solution of the present invention is a method for adjusting the impeller blade clearance of a screw blower, comprising the following steps:

[0007] Step (1): Fix the screw blower on the bracket with its gear side facing upward;

[0008] Step (2): Install the first gear and the second gear onto the male rotor impeller shaft and the female rotor impeller shaft respectively. After installation, the first gear and the second gear mesh with each other. The second gear is locked and fixed to the female rotor impeller shaft, while the first gear can rotate relative to the male rotor impeller shaft. There is a certain preload force between the first gear and the male rotor impeller shaft.

[0009] Step (3): Fix one end of the baffle to the outer end of the gear end of the male rotor impeller shaft;

[0010] Step (4): Fix one end of the dial indicator fixing rod to the outer end of the first gear, install the dial indicator on the other end of the dial indicator fixing rod, and make the dial indicator needle contact the other end of the baffle.

[0011] Step (5): Rotate the first gear counterclockwise to bring the first gear into contact with the second gear, eliminating gear backlash, and then zero the pointer of the dial indicator;

[0012] Step (6): After the dial indicator pointer is zeroed, rotate the male rotor impeller shaft clockwise. During the rotation, observe the change of the dial indicator pointer. When the pointer moves to a positive value, zero the dial indicator pointer again.

[0013] Step (7): After the dial indicator pointer is zeroed again, continue to rotate the male rotor impeller shaft clockwise. During the rotation, observe the dial indicator pointer reading to determine the position of the minimum reading on the dial indicator. Finally, zero the dial indicator pointer again at the position of the minimum reading. This position is the position of the minimum gap between the blades of the male rotor impeller and the female rotor impeller when the male rotor impeller shaft is rotated clockwise.

[0014] Step (8): Rotate the first gear clockwise to bring the first gear into contact with the second gear and eliminate gear backlash;

[0015] Step (9): Rotate the male rotor impeller shaft counterclockwise. During the rotation, observe the pointer reading of the dial indicator to determine the position of the minimum reading on the dial indicator. This position is the final minimum clearance position and minimum blade clearance value between the blades of the male rotor impeller and the female rotor impeller.

[0016] Step (10): Rotate the male rotor impeller shaft clockwise again to reduce the dial indicator reading to 2 / 3 of the minimum blade clearance value. Finally, lock the first gear to the male rotor impeller shaft.

[0017] Step (11): After locking, remove the baffle, dial indicator and dial indicator fixing rod respectively, and lock the oil tank to the wall panel.

[0018] Step (12): During the process of locking the first gear, the pointer reading of the dial indicator should be continuously observed to ensure that the pointer reading of the dial indicator does not change.

[0019] Preferably, if the dial indicator pointer vibrates during the rotation of the male rotor impeller shaft, the male rotor impeller shaft, female rotor impeller shaft, first gear, and second gear should be checked immediately for burrs or dirt and cleaned promptly.

[0020] Preferably, in step (2), the fixing force standard between the first gear and the male rotor impeller shaft is that the first gear can rotate relative to the male rotor impeller shaft, but axial sliding is not allowed.

[0021] Preferably, in step (3), the baffle is fixedly connected to the outer end of the gear end of the male rotor impeller shaft by bolts;

[0022] In step (4), the dial indicator fixing rod is fixedly connected to the outer end of the first gear by bolts.

[0023] Preferably, in step (12), if the dial indicator reading changes during the locking of the first gear, the first gear is slightly loosened, and the male rotor impeller shaft is rotated again according to the change in the dial indicator reading. If the dial indicator reading increases, the male rotor impeller shaft is rotated clockwise to adjust the dial indicator pointer back to 2 / 3 of the minimum blade clearance value in step (10). If the dial indicator reading decreases, the male rotor impeller shaft is rotated counterclockwise to adjust the dial indicator pointer back to 2 / 3 of the minimum blade clearance value in step (10).

[0024] Preferably, when rotating the male rotor impeller shaft, the male rotor impeller shaft cannot be rotated by rotating the female rotor impeller shaft, which would cause the male rotor impeller shaft to rotate due to the meshing action between the male rotor impeller and the female rotor impeller. Nor can the male rotor impeller shaft be rotated by rotating the second gear or the first gear. The operation can only be performed by directly rotating the male rotor impeller shaft.

[0025] Preferably, the screw blower used in the above-mentioned blade clearance adjustment method includes an outer casing and a wall plate, the outer casing and the wall plate are sealed and fixed to each other, and the other end of the wall plate is used to seal and fix to the oil tank.

[0026] Inside the outer casing, there are male rotor impeller shafts and female rotor impeller shafts respectively. The outer circumferences of the male rotor impeller shafts and female rotor impeller shafts are respectively fixedly installed at positions inside the outer casing, and the male rotor impellers and female rotor impellers mesh with each other.

[0027] The first gear and the second gear are fixedly installed on the outer circumference of the male rotor impeller shaft and the female rotor impeller shaft at the position of the oil tank, respectively.

[0028] The beneficial effects of this invention are that the blade clearance adjustment method involves locking the second gear to the female rotor impeller shaft, while the first gear can rotate relative to the male rotor impeller shaft. Furthermore, one end of the baffle is fixedly connected to the outer end of the gear end on the male rotor impeller shaft, and one end of the dial indicator fixing rod is fixedly connected to the outer end of the first gear. A dial indicator is installed at the other end of the dial indicator fixing rod, and the dial indicator needle is brought into contact with the other end of the baffle. During operation, the clearance between the two impellers is measured and adjusted by rotating the first gear. This method offers high measurement efficiency and accuracy, meeting the requirements for high-precision measurement. Attached Figure Description

[0029] Figure 1 This is a perspective view of the present invention;

[0030] Figure 2 This is the front view of the present invention;

[0031] Figure 3 This is a three-dimensional view of the complete structure of the screw blower used in this invention;

[0032] Figure 4 This is the present invention. Figure 1 Enlarged view of point A in the middle.

[0033] Explanation of symbols in the diagram:

[0034] 1. Outer casing; 2. Male rotor impeller shaft; 3. Female rotor impeller shaft; 4. First gear; 5. Second gear; 6. Baffle; 7. Dial indicator; 8. Dial indicator fixing rod; 9. Bolt; 11. Wall panel; 12. Oil tank; 13. Male rotor impeller; 14. Female rotor impeller. Detailed Implementation

[0035] The present invention will be further described below with reference to embodiments.

[0036] pass Figures 1-4 It can be seen that the method for adjusting the impeller blade clearance of this screw blower includes the following steps:

[0037] Step (1): Fix the screw blower on the bracket with its gear side facing upwards for easy operation.

[0038] Step (2): Install the first gear 4 and the second gear 5 onto the male rotor impeller shaft 2 and the female rotor impeller shaft 3 respectively. After installation, the first gear 4 and the second gear 5 mesh with each other. The second gear 5 is locked and fixed to the female rotor impeller shaft 3, while the first gear 4 can rotate relative to the male rotor impeller shaft 2. There is a certain preload between the first gear 4 and the male rotor impeller shaft 2.

[0039] Step (3): Fix one end of the baffle 6 to the outer end of the gear end of the male rotor impeller shaft 2.

[0040] Step (4): Fix one end of the dial indicator fixing rod 8 to the outer end of the first gear 4, install the dial indicator 7 at the other end of the dial indicator fixing rod 8, and make the needle of the dial indicator 7 contact the other end of the baffle 6.

[0041] Step (5): Rotate the first gear 4 counterclockwise to bring the first gear 4 into contact with the second gear 5 to eliminate gear clearance. Then, zero the pointer of the dial indicator 7. Zeroing the pointer here is mainly to facilitate reading in subsequent steps, improve operating efficiency, and shorten operating time.

[0042] Step (6): After the pointer of dial indicator 7 is zeroed, rotate the male rotor impeller shaft 2 clockwise. During the rotation, observe the change of the pointer of dial indicator 7. When the pointer moves to a positive value, the pointer of dial indicator 7 is zeroed again to ensure that the pointer reading of dial indicator is always less than 0. At this time, the working surfaces of the first gear 3 and the second gear 4 are in contact with each other, and the gap between the male rotor side impeller 1 and the female rotor side impeller 2 on the air intake side is 0.

[0043] Step (7): After the pointer of dial indicator 7 is zeroed again, continue to rotate the male rotor impeller shaft 2 clockwise. During the rotation, observe the pointer reading of dial indicator 7 to determine the position of the minimum reading on dial indicator 7. Finally, zero the pointer of dial indicator 7 again at the position of the minimum reading. This position is the position of the minimum gap between the blades of the male rotor impeller 13 and the female rotor impeller 14 when the male rotor impeller shaft 2 rotates clockwise. For example, if the reading is -10 to -5, then the minimum reading is -5.

[0044] Step (8): Rotate the first gear 4 clockwise to bring the first gear 4 into contact with the second gear 5 and eliminate gear backlash.

[0045] Step (9): Rotate the male rotor impeller shaft 2 counterclockwise. During the rotation, observe the pointer reading of the dial indicator 7 to determine the position of the minimum reading on the dial indicator 7. This position is the final minimum gap position and minimum blade gap value between the blade surfaces of the male rotor impeller 13 and the female rotor impeller 14. For example, if the reading is 15-30, then the minimum reading is 15.

[0046] Step (10): Rotate the male rotor impeller shaft 2 clockwise again to reduce the pointer reading of the dial indicator 7 to 2 / 3 of the minimum blade clearance value. This clearance value includes gear backlash. In actual operation, 2 / 3 will decrease, while 1 / 3 on the other side will increase. This prevents the two impellers from contacting each other during rotation. When the blower suddenly stops, the clearance on the 1 / 3 side will not decrease because it does not include gear backlash, thus preventing wear on the impeller during emergency stop. In the case of eliminating gear backlash, the clearance on both sides of the impeller can be guaranteed to be the same. For example, if the minimum reading obtained in step (9) is 15, then the minimum total blade clearance is 0-15. After reducing by 2 / 3, it is 15×2 / 3=10. That is, rotate the male rotor impeller shaft 9 clockwise to adjust the dial indicator reading to 5. Finally, lock the first gear 4 with the male rotor impeller shaft 2.

[0047] Step (11): After locking, remove the baffle 6, dial indicator 7, and dial indicator fixing rod 8 respectively, and lock the oil tank 12 to the wall panel 11.

[0048] Step (12): During the locking of the first gear 4, the pointer reading of dial indicator 7 should be continuously observed to ensure that the pointer reading of dial indicator 7 does not change. If the pointer reading of dial indicator 7 changes, the first gear 3 should be loosened slightly. The male rotor impeller shaft 2 should be rotated again according to the pointer reading. If the pointer reading of dial indicator 7 increases, the male rotor impeller shaft 2 should be rotated clockwise to adjust the dial indicator pointer back to 2 / 3 of the minimum blade clearance value in step (10). If the pointer reading of dial indicator 7 decreases, the male rotor impeller shaft 2 should be rotated counterclockwise to adjust the dial indicator pointer back to 2 / 3 of the minimum blade clearance value in step (10).

[0049] In one specific embodiment, if the dial indicator 7 pointer jitters during the rotation of the male rotor impeller shaft 2, the male rotor impeller shaft 2, female rotor impeller shaft 3, first gear 4, and second gear 5 should be checked immediately for burrs or dirt and cleaned in time, otherwise the accuracy of the gap measurement will be affected.

[0050] In a specific embodiment, in step (2), the fixing force standard between the first gear 4 and the male rotor impeller shaft 2 is that the first gear 4 can rotate relative to the male rotor impeller shaft 2, but axial sliding is not allowed. The reason is that the gears in the blower are mostly helical teeth. If the gear slides axially, it will directly affect the accuracy of the clearance measurement and cause the gear backlash to change.

[0051] In a specific embodiment, in step (3), the baffle 6 is fixedly connected to the outer end of the gear end of the male rotor impeller shaft 2 by bolts 9. In step (4), the dial indicator fixing rod 8 is fixedly connected to the outer end of the first gear 4 by bolts 9. Fixing with bolts 9 can achieve quick disassembly and assembly, improve the efficiency of blade clearance adjustment, and during the disassembly and assembly of bolts 9, no damage will be caused to other components, reducing the operational risk.

[0052] In a specific embodiment, when rotating the male rotor impeller shaft 2, it is not possible to rotate the female rotor impeller shaft 3 to drive the male rotor impeller shaft 2 to rotate due to the meshing action of the male rotor impeller 13 and the female rotor impeller 14. Furthermore, it is not possible to drive the male rotor impeller shaft 2 to rotate by rotating the second gear 5 or the first gear 4. The operation can only be carried out by directly rotating the male rotor impeller shaft 2, using the male rotor impeller shaft 9 as the active driving force. This can increase the accuracy of the gap measurement. In addition, since the outermost part of the shaft is located outside the gear, operating by rotating the male rotor impeller shaft 2 can avoid causing collision damage to the internal components. If the adjustment is made by rotating the gear, on the one hand, it will cause the gear to be overloaded, resulting in a larger gap between the gear and the shaft, reducing the accuracy of gap measurement and adjustment. On the other hand, since wrenches are mostly used in actual operation, wrenches can easily cause collision damage to the gear and surrounding components.

[0053] In one specific embodiment, the screw blower used in the above-described blade clearance adjustment method includes a housing 1 and a wall plate 11, which are sealed and fixed to each other. The other end of the wall plate 11 is used to seal and fix to the oil tank 12.

[0054] The outer casing 1 is provided with a male rotor impeller shaft 2 and a female rotor impeller shaft 3. The outer circumferences of the male rotor impeller shaft 2 and the female rotor impeller shaft 3 are respectively fixedly provided with a male rotor impeller 13 and a female rotor impeller 14 at the positions inside the outer casing 1. The male rotor impeller 13 and the female rotor impeller 14 mesh with each other.

[0055] The first gear 4 and the second gear 5 are fixedly installed on the outer circumference of the male rotor impeller shaft 2 and the female rotor impeller shaft 3 at the position of the oil tank 12, respectively.

[0056] In one specific embodiment, the end face of the baffle 6 that contacts the needle of the dial indicator 7 is a smooth surface, further ensuring the accuracy of the dial indicator 7 reading.

[0057] The end face of the baffle 6 that contacts the outer end of the gear end of the male rotor impeller shaft 2 is a frosted surface. This increases the friction between the baffle 6 and the male rotor impeller shaft 2 during locking, thus increasing the locking firmness and preventing the baffle 6 from being accidentally bumped when the male rotor impeller shaft 2 is manually rotated, which could cause the baffle 6 to loosen. If it loosens, it will directly lead to inaccurate measurement values, wasting operation time and reducing operation efficiency.

[0058] However, the above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A method for adjusting the impeller blade clearance of a screw blower, characterized in that: Includes the following steps: Step (1): Fix the screw blower on the bracket with its gear side facing upward; Step (2): Install the first gear and the second gear onto the male rotor impeller shaft and the female rotor impeller shaft respectively. After installation, the first gear and the second gear mesh with each other. The second gear is locked and fixed to the female rotor impeller shaft, while the first gear can rotate relative to the male rotor impeller shaft. There is a certain preload force between the first gear and the male rotor impeller shaft. Step (3): Fix one end of the baffle to the outer end of the gear end of the male rotor impeller shaft; Step (4): Fix one end of the dial indicator fixing rod to the outer end of the first gear, install the dial indicator on the other end of the dial indicator fixing rod, and make the dial indicator needle contact the other end of the baffle. Step (5): Rotate the first gear counterclockwise to bring the first gear into contact with the second gear, eliminating gear backlash, and then zero the pointer of the dial indicator; Step (6): After the dial indicator pointer is zeroed, rotate the male rotor impeller shaft clockwise. During the rotation, observe the change of the dial indicator pointer. When the pointer moves to a positive value, zero the dial indicator pointer again. Step (7): After the dial indicator pointer is zeroed again, continue to rotate the male rotor impeller shaft clockwise. During the rotation, observe the dial indicator pointer reading to determine the position of the minimum reading on the dial indicator. Finally, zero the dial indicator pointer again at the position of the minimum reading. This position is the position of the minimum gap between the blades of the male rotor impeller and the female rotor impeller when the male rotor impeller shaft is rotated clockwise. Step (8): Rotate the first gear clockwise to bring the first gear into contact with the second gear and eliminate gear backlash; Step (9): Rotate the male rotor impeller shaft counterclockwise. During the rotation, observe the pointer reading of the dial indicator to determine the position of the minimum reading on the dial indicator. This position is the final minimum clearance position and minimum blade clearance value between the blades of the male rotor impeller and the female rotor impeller. Step (10): Rotate the male rotor impeller shaft clockwise again to reduce the dial indicator reading to 2 / 3 of the minimum blade clearance value. Finally, lock the first gear to the male rotor impeller shaft. Step (11): After locking, remove the baffle, dial indicator and dial indicator fixing rod respectively, and lock the oil tank to the wall panel. Step (12): During the process of locking the first gear, the pointer reading of the dial indicator should be continuously observed to ensure that the pointer reading of the dial indicator does not change.

2. The method for adjusting the impeller blade clearance of a screw blower according to claim 1, characterized in that: In step (12), if the dial indicator reading changes during the locking process of the first gear, the first gear is slightly loosened, and the male rotor impeller shaft is rotated again according to the change in the dial indicator reading. If the dial indicator reading increases, the male rotor impeller shaft is rotated clockwise to adjust the dial indicator pointer back to 2 / 3 of the minimum blade clearance value in step (10), and the first gear is locked again. If the dial indicator reading decreases, the male rotor impeller shaft is rotated counterclockwise to adjust the dial indicator pointer back to 2 / 3 of the minimum blade clearance value in step (10), and the first gear is locked again.

3. The method for adjusting the impeller blade clearance of a screw blower according to claim 1, characterized in that: If the dial indicator needle jitters during the rotation of the male rotor impeller shaft, the male rotor impeller shaft, female rotor impeller shaft, first gear, and second gear should be checked immediately for burrs or dirt and cleaned promptly.

4. The method for adjusting the impeller blade clearance of a screw blower according to claim 1, characterized in that: In step (2), the fixing force standard between the first gear and the male rotor impeller shaft is that the first gear can rotate relative to the male rotor impeller shaft, but axial sliding is not allowed.

5. The method for adjusting the impeller blade clearance of a screw blower according to claim 1, characterized in that: In step (3), the baffle is fixedly connected to the outer end of the gear end of the male rotor impeller shaft by bolts; In step (4), the dial indicator fixing rod is fixedly connected to the outer end of the first gear by bolts.

6. The method for adjusting the impeller blade clearance of a screw blower according to claim 1, characterized in that: When rotating the male rotor impeller shaft, it is not possible to rotate the female rotor impeller shaft by rotating the male rotor impeller shaft, which would cause the male rotor impeller shaft to rotate due to the meshing action between the male rotor impeller and the female rotor impeller. Furthermore, it is not possible to rotate the male rotor impeller shaft by rotating the second gear or the first gear. The operation can only be performed by directly rotating the male rotor impeller shaft.

7. The method for adjusting the impeller blade clearance of a screw blower according to any one of claims 1-6, characterized in that: The screw blower used in the impeller blade clearance adjustment method includes an outer casing and a wall plate. The outer casing and the wall plate are sealed and fixed to each other, and the other end of the wall plate is used to seal and fix to the oil tank. The outer casing is provided with a male rotor impeller shaft and a female rotor impeller shaft respectively. The outer circumference of the male rotor impeller shaft and the female rotor impeller shaft are respectively fixedly provided with a male rotor impeller and a female rotor impeller inside the outer casing. The male rotor impeller and the female rotor impeller mesh with each other. The outer circumference of the male rotor impeller shaft and the female rotor impeller shaft are respectively fixed with a first gear and a second gear at the position of the oil tank.

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