Efficient fan and manufacturing method thereof

Abstract

The invention relates to an efficient fan and a manufacturing method thereof, and relates to the technical field of fans, the efficient fan comprises a machine shell, an upper shell and a lower shell of the machine shell are connected through bolts, field installation and client field maintenance are facilitated, a main shaft penetrates through the center position of the machine shell, independent bearing seats are arranged at the two ends of the main shaft, and the main shaft is turned into a stepped hierarchical structure. The impeller is detachably installed on the main shaft and fixed in an abutting mode through the fixing ring and can be replaced, stress generated in the operation process of the impeller is transmitted to the stepped grading structure of the main shaft through the fixing ring, and the impeller is prevented from slipping off and deforming. A backflow device is arranged outside the impeller, the size and shape of the backflow device are optimized through pneumatic calculation, and the casting can be closer to the size of pneumatic design; a backflow channel is arranged in the backflow device and communicated with the air inlet machine shell and the exhaust volute which are welded to the machine shell, the overall weight of the draught fan is reduced, and meanwhile the using requirement under the complex environment is met.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and in particular to a high-efficiency fan and a manufacturing method thereof. Background Art

[0002] Centrifugal fans accelerate the gas input and increase the gas pressure through the high-speed rotation of the internal impeller. They are widely used in construction, chemical industry, etc. Traditional centrifugal fans are mainly divided into cast fans and welded fans. Among them, cast fan castings are closer to the size of the fan aerodynamic design, but the overall casting cost is high, and the on-site use environment of the fan is more complicated. In the presence of corrosive environments, castings are generally difficult to meet the use requirements. Welded fans can meet the on-site use conditions by using different plates, but they have large welding deformation, many errors in plate forming, and low efficiency.

[0003] At the same time, the existing fans also have many inconveniences in use. It is inconvenient to disassemble and assemble the fan impeller, and customers cannot intuitively inspect the internal structure of the fan during a visit; under high speed conditions, the fan impeller produces large offset stress, affecting the service life of the fan; the fan casing may be deformed during use, thereby affecting its use, etc. There is a lack of a fan that integrates various advantages to meet market needs. Summary of the invention

[0004] In order to improve the problems in the above-mentioned background technology, the present invention provides a high-efficiency fan and a manufacturing method thereof.

[0005] The present invention provides a high-efficiency fan and a manufacturing method thereof using the following technical solutions: A high-efficiency fan comprises a casing, wherein a main shaft passes through the center of the casing, and independent bearing seats are arranged at both ends of the main shaft, the independent bearing seats facilitate the overall installation of the fan, and eliminate the influence of stress deformation on the bearing seats when welding the casing, effectively reduce the vibration of the fan, and extend the service life of the fan; the main shaft adopts a stepped graded structure and an impeller is installed around each level of the main shaft, a reflow device is arranged on the outer side of the impeller, and a reflow channel matching the shape of the impeller is arranged inside the reflow device, and the reflow channel is respectively connected to the intake casing and the exhaust volute.

[0006] Preferably, the diameter of the main shaft increases step by step from the front end to the rear end, and a fixing ring is provided on the rear side of the impeller. The impeller is tightly fixed on the main shaft by the fixing ring, and the lateral stress generated during the operation of the impeller is transferred to the main shaft to prevent the impeller from slipping and deforming.

[0007] Preferably, the casing comprises an upper casing and a lower casing, an installation groove for installing the main shaft is reserved between the upper casing and the lower casing, the edges of the upper casing and the lower casing are connected by bolts, and the casing adopts an upper and lower split structure to facilitate installation and maintenance.

[0008] Preferably, the air intake casing and the exhaust volute are welded to the casing, and the welding structure reduces the overall weight of the fan and reduces the cost.

[0009] Preferably, the returner is cast, a groove is provided on the outside of the returner and positioned with a boss stop provided on the inside of the casing. The cast returner can be closer to the size of the fan aerodynamic design, avoiding low efficiency caused by large welding deformation and large sheet forming errors during welding.

[0010] Preferably, the inner side of the reflow channel is provided with spiral patterns along the airflow direction to form a spiral flow channel. The spiral flow channel enables the airflow to maintain a faster flow rate, thereby increasing the use efficiency of the fan.

[0011] Preferably, a pull rod is connected between the intake casing and the exhaust volute, and the body of the pull rod abuts against the outside of the reflow channel to reduce stress deformation of the casing.

[0012] Preferably, the casing and the main shaft are in the form of oil seals, and an oil seal ring is provided at the contact position between the casing and the main shaft to prevent gas from escaping in the gap.

[0013] Preferably, a method for manufacturing a high-efficiency fan comprises the following steps: Step 1: Turn the spindle end face and install the impeller and retaining ring at each stage of the spindle; Step 2: Optimize the size and shape of the returner by aerodynamic calculation, cast the returner according to the optimization result, and install the returner on the outside of the impeller after casting; Step 3: Cut the plate and weld the upper and lower shells of the fan respectively; Step 4: Assemble the casing and weld the intake casing and exhaust volute on the casing; Step 5: Install independent bearing seats at both ends of the spindle.

[0014] In summary, the present invention has the following beneficial technical effects: 1. The present invention integrates the advantages of integrally welded fans and integrally cast fans. The air intake casing and the exhaust volute casing adopt a welded structure, which reduces the overall weight of the fan and reduces the cost while meeting the use requirements in complex environments. The return flow device is cast and is cast after pneumatic optimization. The casting can be closer to the size of the pneumatic design, avoiding errors during welding, and significantly improving the efficiency of the fan.

[0015] 2. The casing of the present invention adopts a structure that is split into upper and lower parts. The upper and lower parts of the casing are connected by bolts and a mounting groove is reserved for installing the main shaft, which is convenient for on-site installation and on-site maintenance by customers; the main shaft is turned into a stepped structure, the impeller is detachably installed on the main shaft and fixed by a fixing ring, and can be replaced. The lateral stress generated during the operation of the impeller is transmitted to the stepped structure of the main shaft through the fixing ring to prevent the impeller from slipping and deforming; independent bearing seats are arranged at both ends of the main shaft, which is convenient for installation while eliminating the influence of stress deformation of the welding shell on the bearing seat, thereby extending the service life of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a partial perspective view of a high-efficiency fan according to embodiment 1 of the invention; Figure 2 is a side view of a high-efficiency fan according to embodiment 1 of the invention; Figure 3 It is a partial perspective view of a high-efficiency fan according to embodiment 2 of the invention.

[0017] Explanation of the reference numerals: 1. casing; 2. main shaft; 3. bearing seat; 4. impeller; 5. fixing ring; 6. return flow device; 7. return flow channel; 8. intake casing; 9. exhaust volute; 10. upper casing; 11. lower casing; 12. mounting groove; 13. bolt; 14. groove; 15. boss; 16. spiral pattern; 17. pull rod; 18. oil seal ring; 19. mounting ring. DETAILED DESCRIPTION

[0018] The following combination Figure 1-Figure 3 The present invention is described in further detail.

[0019] Embodiment 1 of the invention discloses a high-efficiency fan and a method for manufacturing the same.

[0020] Reference Figure 1 , Figure 2 A high-efficiency fan comprises a casing 1, a main shaft 2 passes through the center of the casing 1, and independent bearing seats 3 are arranged at both ends of the main shaft 2. The independent bearing seats 3 facilitate the overall installation of the fan and eliminate the influence of stress deformation on the bearing seats 3 when welding the casing 1, effectively reduce the vibration of the fan, and extend the service life of the fan; the main shaft 2 adopts a stepped hierarchical structure and an impeller 4 is installed around each level of the main shaft 2, a reflow device 6 is arranged on the outer side of the impeller 4, and a reflow channel 7 matching the shape of the impeller 4 is arranged inside the reflow device 6, and the reflow channel 7 is respectively connected to the intake casing 8 and the exhaust volute 9.

[0021] Reference Figure 1 , Figure 2The diameter of the main shaft 2 increases step by step from the front end to the rear end. Fixed rings 5 ​​are arranged on both sides of the impeller 4. The impeller 4 is fixed to the main shaft 2 through the fixed rings 5. The fixed ring 5 on the rear side of the impeller 4 contacts the stepped end surface of the main shaft 2 and is tightened through the fixed ring 5 on the front side of the impeller 4. The impeller 4 is detachably mounted on the main shaft 2 and can be replaced. The stress generated during the operation of the impeller 4 is transmitted to the stepped structure of the main shaft 2 through the fixed ring 5 to prevent the impeller 4 from slipping and deformation.

[0022] Reference Figure 2 The casing 1 includes an upper casing 10 and a lower casing 11. A mounting groove 12 for mounting the main shaft 2 is reserved between the upper casing 10 and the lower casing 11. The edges of the upper casing 10 and the lower casing 11 are connected by bolts 13. The casing 1 adopts a structure that is split up and down for easy installation and maintenance.

[0023] Reference Figure 1 The air intake casing 8 and the exhaust volute 9 are welded to the casing 1. The air intake casing 8 is welded to the front end of the casing 1, and the exhaust volute 9 is welded to the rear end of the casing 1. The welding structure reduces the overall weight of the fan and reduces the cost.

[0024] Reference Figure 1 The return flow device 6 is cast, that is, lost foam casting is adopted. A groove 14 is provided on the outer side of the return flow device 6 and is positioned with a stopper of a boss 15 arranged on the inner side of the casing 1. The cast return flow device 6 is closer to the size of the pneumatic design of the fan, avoiding the low efficiency caused by large welding deformation and large sheet forming error during welding.

[0025] Reference Figure 1 A spiral pattern 16 is arranged on the inner side of the return channel 7 along the airflow direction to form a spiral flow channel. The rotation of the impeller 4 drives the airflow velocity to gradually increase. The spiral flow channel enables the airflow to maintain a faster flow velocity, thereby increasing the efficiency of the fan.

[0026] Reference Figure 1 A pull rod 17 is connected between the intake casing 8 and the exhaust volute 9. The body of the pull rod 17 abuts against the outside of the return channel 7. The pull rod 17 reduces the stress deformation of the casing and ensures efficiency.

[0027] Reference Figure 1 The casing 1 and the main shaft 2 are in the form of oil seals, and an oil seal ring 18 is provided at the contact position between the casing 1 and the main shaft 2 to prevent gas from escaping in the gap.

[0028] Reference Figure 1 , Figure 2 A method for manufacturing a high-efficiency fan, comprising the following steps: Step 1: Turn the end face of the spindle 2 and install the impeller 4 and the fixing ring 5 at each stage of the spindle 2; Step 2: pneumatic calculation is used to optimize the size and shape of the return flow device 6, and the return flow device 6 is cast according to the optimization result. The return flow device 6 is cast and installed on the outside of the impeller 4; the size and shape of the return flow device 6 are optimized by pneumatic calculation of the fan, and the efficiency of the cast return flow device 6 is significantly improved when it is used; Step 3: Use different plates to meet the on-site working conditions, cut the plates and weld the upper shell 10 and the lower shell 11 of the fan respectively; Step 4: Assemble the casing 1, and weld the air intake casing 8 at the front end of the casing 1, and weld the exhaust volute 9 at the rear end of the casing 1; Step 5: Install independent bearing seats 3 at both ends of the main shaft 2.

[0029] The implementation principle of a high-efficiency fan and its manufacturing method in embodiment 1 of the invention is as follows: when the fan is in use, air is sucked into the air intake casing 8, the main shaft 2 drives the impeller 4 to rotate, and driven by the multi-stage impeller 4, the air flow flows from the front end to the rear end in the reflow channel 7, and the flow rate and pressure gradually reach the use requirements and are discharged from the exhaust volute 9.

[0030] Invention Example 2 discloses a high-efficiency fan and a method for manufacturing the same.

[0031] Reference Figure 3 A high-efficiency fan includes a casing 1, a main shaft 2 passes through the center of the casing 1, and independent bearing seats 3 are arranged at both ends of the main shaft 2; the main shaft 2 adopts a stepped hierarchical structure and an impeller 4 is installed around each level of the main shaft 2, a return flow device 6 is arranged on the outer side of the impeller 4, and a return flow channel 7 matching the shape of the impeller 4 is arranged inside the return flow device 6, and the return flow channel 7 is respectively connected to an intake casing 8 and an exhaust volute 9.

[0032] Referring to 3, the diameter of the main shaft 2 increases step by step from both ends to the middle direction, and a mounting ring 19 is provided on the middle section of the main shaft 2. The impellers 4 arranged on both sides of the mounting ring 19 are installed oppositely and abut against the mounting ring 19 to offset the lateral stress generated by the impeller 4 during operation. A fixing ring is provided on the rear side of the impeller 4, and the impeller 4 is fixed to the main shaft 2 through a fixing ring 5.

[0033] Reference Figure 3 The air intake casing 8 and the exhaust volute 9 are welded to the casing 1. The air intake casing 8 is welded to both ends of the casing 1, and the exhaust volute 9 is welded to the middle position of the casing 1. The welding structure reduces the overall weight of the fan and reduces the cost.

[0034] Reference Figure 2 , Figure 3 A method for manufacturing a high-efficiency fan, comprising the following steps: Step 1: Turn the end face of the spindle 2 and install the impeller 4 and the fixing ring 5 at each stage of the spindle 2; Step 2: pneumatic calculation is used to optimize the size and shape of the return flow device 6, and the return flow device 6 is cast according to the optimization result. The return flow device 6 is cast and installed on the outside of the impeller 4; the size and shape of the return flow device 6 are optimized by pneumatic calculation of the fan, and the efficiency of the cast return flow device 6 is significantly improved when it is used; Step 3: Use different plates to meet the on-site working conditions, cut the plates and weld the upper shell 10 and the lower shell 11 of the fan respectively; Step 4: Assemble the casing 1, and weld the air intake casing 8 at both ends of the casing 1, and weld the exhaust volute 9 in the middle of the casing 1; Step 5: Install independent bearing seats 3 at both ends of the main shaft 2.

[0035] The implementation principle of a high-efficiency fan and a manufacturing method thereof according to embodiment 2 of the invention is as follows: embodiment 2 of the invention is suitable for a structure in which air enters at both ends of the fan and exhausts in the middle, and the diameter of the main shaft 2 increases step by step from both ends to the middle, and the impellers 4 are installed oppositely and abut against each other. This structure allows the lateral stresses generated by the impellers 4 during operation to offset each other, and there is no need to install structural parts at both ends of the fan to eliminate the lateral stress.

[0036] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-efficiency fan, characterized in that: The invention comprises a casing (1), wherein a main shaft (2) passes through the center of the casing (1), and independent bearing seats (3) are arranged at both ends of the main shaft (2). The main shaft (2) adopts a stepped structure and an impeller (4) is mounted around each level of the main shaft (2). A returner (6) is arranged outside the impeller (4), and a return channel (7) matching the shape of the impeller (4) is arranged inside the returner (6), and the return channel (7) is connected to the intake casing (8) and the exhaust volute (9) respectively.

2. A high-efficiency fan according to claim 1, characterized in that: The diameter of the main shaft (2) increases step by step from the front end to the rear end, a fixing ring (5) is provided on the rear side of the impeller (4), and the impeller (4) is tightly fixed on the main shaft (2) through the fixing ring (5).

3. A high-efficiency fan according to claim 1, characterized in that: The housing (1) comprises an upper housing (10) and a lower housing (11), a mounting groove (12) for mounting a main shaft (2) is reserved between the upper housing (10) and the lower housing (11), and the edges of the upper housing (10) and the lower housing (11) are connected by bolts (13).

4. A high-efficiency fan according to claim 1, characterized in that: The air intake casing (8) and the exhaust volute (9) are welded to the casing (1).

5. A high-efficiency fan according to claim 1, characterized in that: The returner (6) is cast, and a groove (14) is provided on the outside of the returner (6) and is positioned with a stopper of a boss (15) provided on the inside of the housing (1).

6. A high-efficiency fan according to claim 1, characterized in that: The inner side of the reflow channel (7) is provided with spiral patterns (16) along the airflow direction to form a spiral flow channel.

7. A high-efficiency fan according to claim 1, characterized in that: A pull rod (17) is connected between the air intake casing (8) and the exhaust volute (9), and a body of the pull rod (17) abuts against the outside of the reflow channel (7).

8. A high-efficiency fan according to claim 1, characterized in that: The casing (1) and the main shaft (2) are in the form of an oil seal, and an oil seal ring (18) is provided at the contact position between the casing (1) and the main shaft (2).

9. A method for manufacturing a high-efficiency fan, manufacturing a high-efficiency fan as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Turning the end face of the main shaft (2) and installing the impeller (4) and the fixing ring (5) at each stage of the main shaft (2); Step 2: Optimizing the size and shape of the returner (6) by aerodynamic calculation, casting the returner (6) according to the optimization result, and installing the returner (6) on the outside of the impeller (4) after the returner (6) is cast; Step 3: Cut the plate and weld the upper shell (10) and the lower shell (11) of the fan respectively; Step 4: Assemble the casing (1), and weld the intake casing (8) and the exhaust volute (9) to the casing (1); Step 5: Install independent bearing seats (3) at both ends of the main shaft (2).

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