Low-power single-phase centrifugal fan and design method thereof

Abstract

This invention discloses a low-power single-phase centrifugal fan, relating to the field of ventilation technology. The stator has a centrally connected shaft, with an impeller connected to the shaft. A magnetic strip is installed on the motor housing inside the impeller, and windings are arranged on the outer periphery of the stator. The shaft and impeller are connected via a transmission assembly. A balancing mud placement area is provided on the impeller. The transmission assembly connecting the shaft and impeller ensures that the center of gravity of the fan's rotating parts rests on the shaft, solving problems such as vibration and uneven stress on the central shaft caused by power transmission via a semi-circular cross-section shaft in existing technologies. The balancing mud placement area on the impeller allows for fine-tuning of the center of gravity of the fan's rotating parts, further ensuring that the center of gravity is on the shaft. The design method includes: determining the impeller outer diameter and number of blades based on the predetermined air volume; and determining the number of winding turns based on the impeller outer diameter, the number of impeller blades, and the magnetic field strength of the magnetic strip. This ensures the fan achieves the predetermined effect while minimizing the number of winding turns, saving costs.

Description

Technical Field

[0001] This invention relates to the field of ventilation technology, specifically to a low-power single-phase centrifugal fan and its design method. Background Technology

[0002] A single-phase motor is an asynchronous motor that operates powered by a 220V AC single-phase power supply. Because 220V power supply is very convenient and economical, and household electricity is also 220V, single-phase motors are not only widely used in production, but are also closely related to people's daily lives. In particular, with the continuous improvement of people's living standards, the use of single-phase motors in household appliances is also increasing.

[0003] Chinese patent application CN202222995719.6 discloses a miniature brushless four-slot four-pole motor device, including a housing, a central shaft, an iron core stator, an iron core rotor, a coil, and a magnet. The central shaft is rotatably connected to the housing, the iron core rotor is fixedly sleeved on the central shaft, the magnet is fixedly mounted on the iron core rotor, the iron core stator is fixedly mounted in the housing and surrounds the iron core rotor, and the coil is mounted on the iron core stator. A limiting groove is provided at the end of the housing opposite to the free end of the central shaft, and the end of the central shaft opposite to the free end is located in the limiting groove and can rotate a certain angle within the limiting groove to constrain the rotation amplitude of the central shaft. The central shaft of this miniature brushless four-slot four-pole motor device does not have spring clips at either end. Instead, the deflection angle of the central shaft is limited by the interference between the ends of the central shaft and the housing. Compared to a spring clip structure, this allows for more precise control of the rotation amplitude of the central shaft, and its performance and service life are not affected by increased usage.

[0004] The central shaft for external connection in the aforementioned patent adopts a notch design. The central shaft with a semi-circular cross-section transmits power. However, due to the missing part of the output end of the central shaft, the center of gravity of the central shaft will deviate from the center position of the central shaft. When the motor rotates, it will cause motor vibration and uneven force on the central shaft. Summary of the Invention

[0005] This invention provides a low-power single-phase centrifugal fan and its design method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A low-power single-phase centrifugal fan includes a stator, a shaft core rotatably connected to the middle of the stator, an impeller connected to the shaft core, a magnetic strip on the motor housing inside the impeller, and windings on the outer periphery of the stator.

[0008] The shaft and impeller are connected via a transmission assembly;

[0009] The impeller is equipped with a balancing mud placement area.

[0010] Preferably, the stator is mounted on a support, a support tube is provided in the middle of the support, silicon steel sheets are provided on the outer periphery of the support tube, and windings are provided on the silicon steel sheets;

[0011] An upper insulating cover and a lower insulating cover are provided between the silicon steel sheet and the winding, and the upper insulating cover and the lower insulating cover are located on the upper and lower sides of the silicon steel sheet;

[0012] A shaft is rotatably connected inside the central tube of the support. An oil-impregnated bearing is installed between the shaft and the central tube of the support, and the oil-impregnated bearing is sleeved on the shaft.

[0013] Preferably, an iron shell is installed inside the tube of the support, a strong magnet is installed inside the iron shell, and a wear-resistant plate is installed on the strong magnet;

[0014] The lower end of the shaft is provided with an impeller shaft mushroom head, which abuts against the wear-resistant plate;

[0015] A retaining ring is fastened to the top of the iron shell, and the retaining ring is located above the mushroom head of the impeller shaft core;

[0016] A washer is provided above the retaining ring, and the retaining ring and washer are fitted onto the connection between the mushroom head of the impeller shaft and the oil-impregnated bearing.

[0017] An upper insulating cover is provided at the upper end of the bracket tube, and the shaft core passes through the upper insulating cover and is rotatably connected to the upper insulating cover;

[0018] The lower surface of the upper insulating cover is provided with an upper insulating cover top seat, and the lower end of the upper insulating cover top seat abuts against the upper end of the oil-impregnated bearing.

[0019] The gaps inside the tube of the support are filled with lubricating oil.

[0020] Preferably, the impeller has a concave cavity in the middle, and the impeller shaft core is provided in the middle of the cavity, with the shaft core connected to the impeller shaft core core.

[0021] A motor housing is installed inside the cavity of the impeller, and a magnetic strip is installed on the inner wall of the motor housing.

[0022] Preferably, a circuit board is fixedly connected to the bracket, and the circuit board is electrically connected to the winding via pins;

[0023] The bracket is equipped with a wire clip;

[0024] The bracket is equipped with rubber pads.

[0025] Preferably, a rib is provided between the impeller and the motor housing;

[0026] The impeller has two ribs on its center surface;

[0027] Three reinforcing bars are installed between the outer side of the support tube and the silicon steel sheet;

[0028] Four ribs are provided between the inner side of the support tube and the oil-impregnated bearing.

[0029] Preferably, the transmission assembly includes a positioning sleeve, which is fixedly connected to the shaft core, inserted into the connecting sleeve, and the outer periphery of the connecting sleeve is fixedly connected to the impeller.

[0030] The positioning sleeve is equipped with a first limiting tooth.

[0031] Preferably, a first locking tooth is fixedly connected to the positioning sleeve, and a stabilizing ring is fixedly connected to the outer periphery of the first locking tooth;

[0032] The positioning sleeve has a sliding connection of a linkage bowl, which is slidably connected to the slot. A connecting ring is provided inside the linkage bowl. The connecting ring is fixedly connected to the inner wall of the linkage bowl through a second limiting tooth. Several sets of second locking teeth are rotatably connected to the inner wall of the connecting ring. A third locking tooth is fixedly connected to the second locking tooth.

[0033] The linkage bowl is provided with a groove that is compatible with the first limiting tooth;

[0034] An adjusting rod is inserted into the linkage bowl. The adjusting rod is fixedly connected to a fourth locking tooth at its position inside the linkage bowl. The fourth locking tooth is compatible with the third locking tooth.

[0035] A positioning rod is fixedly connected to the end of the adjusting rod facing the positioning sleeve;

[0036] The adjusting rod is fitted with a spring, with the two ends of the spring abutting against the linkage cup and the connecting sleeve port, respectively.

[0037] An elastic element is provided between the fourth locking tooth and the linkage cup, and the elastic element is sleeved on the adjusting rod;

[0038] The adjacent end faces of the third and fourth locking teeth are beveled, and the sides of the third and fourth locking teeth are also beveled.

[0039] The cross-section of the adjusting rod is non-circular.

[0040] Preferably, the bracket is fixed to the outside by a fixing component, which includes a fixing sleeve and a fixing rod. A fixing block is fixedly connected inside the fixing sleeve, and a card is fixedly connected to the fixing block. A fastening spring is provided on the outside of the card. The fastening spring is provided on the inner wall of the fixing sleeve. A limit ring is provided at the opening of the fixing sleeve, and a card hole is provided on the side wall of the fixing sleeve.

[0041] A locking plate is fixedly connected to the fixing rod, and the locking plate has a notch. The fixing rod has a hole inside, and the hole inside the fixing rod has a groove. A knob is fixedly connected to the fixing rod.

[0042] A limit plate is fixedly connected to the fixed rod.

[0043] A design method for a low-power single-phase centrifugal fan, comprising the following steps:

[0044] S1: Determine the impeller outer diameter and number of blades based on the predetermined air volume;

[0045] S2: Determine the number of winding turns based on the impeller outer diameter, the number of impeller blades, and the magnetic field strength of the magnetic strip.

[0046] Compared with the prior art, the present invention has at least the following beneficial effects:

[0047] This application uses a transmission component when connecting the shaft core and the impeller, so that the center of gravity of the rotating part of the fan falls on the shaft core, which solves the problems of vibration and uneven force on the central shaft caused by the transmission of power through the central shaft with a semi-circular cross section in the prior art.

[0048] Furthermore, this application provides a balancing mud placement area on the impeller. By placing balancing mud in the balancing mud placement area, the position of the center of gravity of the rotating part of the fan is finely adjusted, further ensuring that the center of gravity of the rotating part of the fan is on the shaft. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0050] Figure 2 This is a cross-sectional view of the main structure of the present invention;

[0051] Figure 3 This is a partial cross-sectional view of the main structure of the present invention;

[0052] Figure 4 This is a front view schematic diagram of the main structure of the present invention;

[0053] Figure 5 This is a left-side view of the main structure of the present invention;

[0054] Figure 6 This is a rear view schematic diagram of the main structure of the present invention;

[0055] Figure 7 This is a cross-sectional view of the main structure of the present invention with the fan blade magnetic ring hidden.

[0056] Figure 8 This is a front view schematic diagram of the main structure of the present invention with the fan blades and magnetic rings hidden.

[0057] Figure 9 This is a cross-sectional view of the main structure of the present invention, showing the hidden fan blade magnetic ring and insulating cover.

[0058] Figure 10 This is a front view schematic diagram of the main structure of the present invention, showing the hidden fan blade magnetic ring and insulating cover.

[0059] Figure 11 This is an exploded view of the fixed component structure of the present invention;

[0060] Figure 12 This is a cross-sectional view of the fixed component structure of the present invention;

[0061] Figure 13 This is a schematic diagram of the fixing component structure of the present invention;

[0062] Figure 14 This is a schematic diagram of the transmission component structure of the present invention;

[0063] Figure 15 This is a cross-sectional schematic diagram of the transmission component structure of the present invention;

[0064] Figure 16 This is a partial structural diagram of the transmission component of the present invention;

[0065] Figure 17 This is a schematic diagram of the partial structure and fit of the transmission component of the present invention.

[0066] In the diagram: 1. Stator; 2. Winding; 3. Support tube; 4. Upper insulating cover; 5. Shaft core; 6. Impeller shaft core rubber coating area; 7. Top seat of upper insulating cover; 8. Rib 1; 9. Rib 2; 10. Rib 3; 11. Rib 4; 12. Motor housing; 13. Magnetic strip; 14. Impeller; 15. Balancing mud placement area; 16. Lubricating oil; 17. Oil-impregnated bearing; 18. Pin; 19. Circuit board; 20. Support; 21. Wire clip; 22. Lower insulating cover; 23. Silicon steel sheet; 24. Rubber pad; 25. Impeller shaft core mushroom head; 26. Wear-resistant sheet; 27. Iron shell; 28. 29. Strong magnet; 30. Buckle ring; 31. Washer ring; 32. Fixing sleeve; 33. Fastening spring; 34. Limiting ring; 35. Fixing block; 36. Card; 37. Fixing rod; 38. Positioning plate; 39. Limiting plate; 40. Knob position; 41. Groove; 42. Connecting sleeve; 43. Adjusting rod; 44. Positioning sleeve; 45. First limiting tooth; 46. First locking tooth; 47. Stabilizing ring; 48. Slot; 49. Spring; 50. Linkage cup; 51. Positioning insert rod; 52. Second locking tooth; 53. Connecting ring; 54. Second limiting tooth; 55. Third locking tooth; 56. Fourth locking tooth. Detailed Implementation

[0067] In this invention, the terms "first," "second," etc., are used for descriptive purposes only and do not specifically refer to any order or sequence, nor are they intended to limit the invention. They are merely used to distinguish protective components or operations described using the same technical terms, and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0068] Example 1

[0069] Please see Figure 1-10 An embodiment of the present invention provides a low-power single-phase centrifugal fan, including a stator 1, a shaft core 5 rotatably connected to the middle of the stator 1, an impeller 14 connected to the shaft core 5, a magnetic strip 13 disposed on the motor housing 12 inside the impeller 14, and a winding 2 disposed on the outer periphery of the stator 1.

[0070] Shaft core 5 and impeller 14 are connected via a transmission assembly;

[0071] The impeller 14 is provided with a balancing mud placement area 15.

[0072] The working principle and beneficial effects of the above scheme are as follows:

[0073] This application uses a transmission assembly when connecting the shaft core 5 and the impeller 14, so that the center of gravity of the rotating part of the fan falls on the shaft core 5, which solves the problems of vibration and uneven force on the central shaft caused by the transmission of power through the central shaft with a semi-circular cross section in the prior art.

[0074] Furthermore, this application provides a balancing mud placement area 15 on the impeller 14. By placing balancing mud in the balancing mud placement area 15, the position of the center of gravity of the rotating part of the fan is finely adjusted, further ensuring that the center of gravity of the rotating part of the fan is on the shaft core 5.

[0075] Example 2

[0076] Please see Figure 1-10 Based on Example 1, the winding 2 is provided with 6 sets, and the 6 sets of winding 2 are connected in series.

[0077] The working principle and beneficial effects of the above scheme are as follows:

[0078] Compared to the traditional four-slot, four-pole design, the six-winding design of this application has more slots, a higher slot fill factor, and better slot matching. This is beneficial for improving the distribution of the air gap magnetic field, reducing eddy current losses and hysteresis losses, and improving the efficiency and power factor of the motor. The slot-pole matching can reduce iron losses and copper losses, optimize the overall energy efficiency of the motor, and significantly reduce operating power and improve energy utilization under the premise of ensuring the same air volume, air pressure, and noise, and under single-phase power supply environment. It has significant environmental protection and energy-saving effects and economic value.

[0079] Example 3

[0080] Please see Figure 1-10 Based on embodiments 1-2, the stator 1 is mounted on the bracket 20, the bracket 20 has a bracket tube 3 in the middle, the bracket tube 3 has silicon steel sheets 23 on its outer periphery, and the silicon steel sheets 23 have windings 2 mounted on them.

[0081] An upper insulating cover 4 and a lower insulating cover 22 are provided between the silicon steel sheet 23 and the winding 2, and the upper insulating cover 4 and the lower insulating cover 22 are located on the upper and lower sides of the silicon steel sheet 23.

[0082] A shaft core 5 is rotatably connected inside the bracket tube 3. An oil-impregnated bearing 17 is provided between the shaft core 5 and the bracket tube 3, and the oil-impregnated bearing 17 is sleeved on the shaft core 5.

[0083] An iron shell 27 is installed inside the middle tube 3 of the support, a strong magnet 28 is installed inside the iron shell 27, and a wear-resistant plate 26 is installed on the strong magnet 28.

[0084] The lower end of the shaft core 5 is provided with an impeller shaft core mushroom head 25, which abuts against the wear-resistant plate 26;

[0085] A retaining ring 29 is fastened to the top of the iron shell 27, and the retaining ring 29 is located above the mushroom head 25 of the impeller shaft core;

[0086] A washer 30 is provided above the retaining ring 29. The retaining ring 29 and the washer 30 are sleeved at the connection between the impeller shaft core mushroom head 25 and the oil-impregnated bearing 17.

[0087] Both buckle 29 and washer 30 are made of Mylar material;

[0088] An upper insulating cover 4 is provided at the upper end of the bracket tube 3, and the shaft core 5 passes through the upper insulating cover 4 and is rotatably connected to the upper insulating cover 4.

[0089] The lower surface of the upper insulating cover 4 is provided with an upper insulating cover top seat 7, and the lower end of the upper insulating cover top seat 7 abuts against the upper end of the oil-impregnated bearing 17.

[0090] The gaps inside the tube 3 of the support are filled with lubricating oil 16.

[0091] The impeller 14 has a concave cavity in the middle, and the impeller shaft core rubber-coated position 6 is provided in the middle of the cavity of the impeller 14. The shaft core 5 is connected to the impeller shaft core rubber-coated position 6.

[0092] A motor housing 12 is disposed inside the cavity of the impeller 14, and a magnetic strip 13 is disposed on the inner wall of the motor housing 12.

[0093] A circuit board 19 is fixedly connected to the bracket 20, and the circuit board 19 is electrically connected to the winding 2 through a pin 18.

[0094] A wire buckle 21 is provided on the bracket 20;

[0095] A rubber pad 24 is provided on the bracket 20.

[0096] The working principle and beneficial effects of the above scheme are as follows:

[0097] A winding 2 is placed within the magnetic field formed by magnetic strip 13. Power is supplied to the winding 2 via circuit board 19, and the current direction is continuously changed. The flowing current generates a magnetic field between the windings 2. The winding 2 is repelled by one side of the magnetic strip 13 while being attracted by the other side, causing it to rotate continuously. During rotation, the current flowing through the coil is reversed, allowing it to continue rotating.

[0098] The washer 30 is provided to prevent the retaining ring 29 from rubbing against the inner wall of the oil-impregnated bearing 17.

[0099] The retaining ring 29 is located at the connection between the impeller shaft core mushroom head 25 and the oil-impregnated bearing 17, effectively fixing the shaft core 5 and preventing the impeller 14 from falling off.

[0100] Among them, the wear-resistant plate 26 is used to support the impeller shaft core mushroom head 25 and prevent the impeller shaft core mushroom head 25 from rubbing against the strong magnet 28;

[0101] Among them, the iron shell 27 is designed to shield the outflowing magnetic field and guide the effective magnetic field.

[0102] Example 4

[0103] Please see Figure 2 Based on embodiments 1-3, a rib 8 is provided between the impeller 14 and the motor housing 12;

[0104] Ribs 2 9 are provided on the center surface of impeller 14;

[0105] A reinforcing bar 3 10 is provided between the outer side of the support tube 3 and the silicon steel sheet 23;

[0106] A rib 11 is provided between the inner side of the support tube 3 and the oil-impregnated bearing 17.

[0107] The working principle and beneficial effects of the above scheme are as follows:

[0108] Rib 8 is used to tightly fit the motor housing 12 and the impeller 14 to prevent the magnetic strip 13 from falling off or loosening inside the impeller 14;

[0109] Rib 29 is used to prevent deformation of the center surface of impeller 14;

[0110] Rib 3 is used to prevent stator 1 from falling off or loosening from the support tube 3;

[0111] Rib 4 is used to prevent the oil-impregnated bearing 17 from falling off or loosening inside the bracket tube 3.

[0112] Example 5

[0113] Please see Figure 14-17 Based on embodiments 1-4, the transmission assembly includes a positioning sleeve 43, which is fixedly connected to the shaft core 5 and inserted into the connecting sleeve 41. The outer periphery of the connecting sleeve 41 is fixedly connected to the impeller 14.

[0114] The positioning sleeve 43 is provided with a first limiting tooth 44.

[0115] A first locking tooth 45 is fixedly connected to the positioning sleeve 43, and a stabilizing ring 46 is fixedly connected to the outer periphery of the first locking tooth 45.

[0116] A linkage bowl 49 is slidably connected inside the positioning sleeve 43. The linkage bowl 49 is slidably connected to the slot 47. A connecting ring 52 is provided inside the linkage bowl 49. The connecting ring 52 is fixedly connected to the inner wall of the linkage bowl 49 through the second limiting tooth 53. Several sets of second locking teeth 51 are rotatably connected to the inner wall of the connecting ring 52. A third locking tooth 54 is fixedly connected to the second locking teeth 51.

[0117] The linkage bowl 49 is provided with a groove that is compatible with the first limiting tooth 44;

[0118] An adjusting rod 42 is inserted into the linkage bowl 49. The adjusting rod 42 is fixedly connected to a fourth locking tooth 55 at the position inside the linkage bowl 49. The fourth locking tooth 55 is compatible with the third locking tooth 54.

[0119] A positioning rod 50 is fixedly connected to one end of the adjusting rod 42 facing the positioning sleeve 43;

[0120] A spring 48 is fitted onto the adjusting rod 42, with the two ends of the spring 48 abutting against the linkage cup 49 and the port of the connecting sleeve 41, respectively.

[0121] An elastic element is provided between the fourth locking tooth 55 and the linkage bowl 49, and the elastic element is sleeved on the adjusting rod 42;

[0122] The adjacent end faces of the third locking tooth 54 and the fourth locking tooth 55 are inclined surfaces, and the sides of the third locking tooth 54 and the fourth locking tooth 55 are also inclined surfaces.

[0123] The cross-section of the adjusting rod 42 is non-circular (not shown in the figure).

[0124] The working principle and beneficial effects of the above scheme are as follows:

[0125] When the shaft core 5 and impeller 14 are fixed by the transmission assembly, the adjusting rod 42 is pulled out and the connecting sleeve 41 that fixes the impeller 14 is inserted into the positioning sleeve 43. The first limiting tooth 44 on the positioning sleeve 43 is engaged in the groove in the linkage cup 49, which enhances the stability of the connection. The first locking tooth 45 is engaged with the locking of the second locking tooth 51, the third locking tooth 54, the fourth locking tooth 55 and the non-circular section of the adjusting rod 42, which prevents the positioning sleeve 43 and the connecting sleeve 41 from rotating relative to each other and ensures the transmission of power.

[0126] Since the adjusting rod 42 is pulled out, the second locking tooth 51 and the third locking tooth 54 are in a free state and can rotate along the inner ring of the connecting ring 52. When the connecting sleeve 41 is inserted into the positioning sleeve 43, each set of first locking teeth 45 is inserted between adjacent second locking teeth 51. Then, the adjusting rod 42 is released, and under the action of the elastic element, the fourth locking tooth 55 is inserted between the third locking teeth 54. Since the end faces of the third locking teeth 54 and the fourth locking tooth 55 are inclined, when the fourth locking tooth 55 is inserted between the third locking teeth 54, the fourth locking tooth 55 will drive the third locking tooth 54 to rotate to complete the insertion, thereby driving the second locking tooth 51 to rotate. The second locking tooth 51 is engaged with the first locking tooth 45, which effectively prevents the positioning sleeve 43 and the connecting sleeve 41 from falling off, thus ensuring the relative stability of the fixing of the shaft core 5 and the impeller 14.

[0127] Furthermore, the centrally symmetrical structure of the transmission component ensures that the center of gravity of the rotating part of the fan falls on the shaft core 5, which solves the problems of vibration and uneven force on the central shaft caused by the transmission of power through the central shaft with a semi-circular cross section in the existing technology.

[0128] When the impeller 14 malfunctions and causes excessive resistance in the shaft core 5, exceeding the rated power of the fan, relative sliding occurs between the third locking tooth 54 and the fourth locking tooth 55, limiting the maximum load-bearing capacity of the shaft core 5, effectively protecting the fan and preventing excessive fan load from causing losses.

[0129] Example 6

[0130] Please see Figure 11-13 Based on embodiments 1-5, the bracket 20 is fixed to the outside through a fixing component. The fixing component includes a fixing sleeve 31 and a fixing rod 36. A fixing block 34 is fixedly connected inside the fixing sleeve 31. A card 35 is fixedly connected to the fixing block 34. A fastening spring 32 is provided on the outside of the card 35. The fastening spring 32 is provided on the inner wall of the fixing sleeve 31. A limit ring 33 is provided at the opening of the fixing sleeve 31. A card hole is provided on the side wall of the fixing sleeve 31.

[0131] A locking plate 37 is fixedly connected to the fixing rod 36. The locking plate 37 has a notch. The fixing rod 36 has a hole, and the hole in the fixing rod 36 has a groove 40. A knob position 39 is fixedly connected to the fixing rod 36.

[0132] A limit plate 38 is fixedly connected to the fixed rod 36.

[0133] The working principle and beneficial effects of the above scheme are as follows:

[0134] The rubber pad 24 is inserted through the fixing rod 36, and the rubber pad 24 passes through the fixing position. The fixing rod 36 is inserted into the fixing sleeve 31 by the limiting plate 38. The knob position 39 is rotated to drive the locking plate 37 to rotate, so that the circular outer edge of the locking plate 37 rotates into the locking hole on the side wall of the fixing sleeve 31, thus completing the locking.

[0135] Among them, the elastic material card 35 is engaged in the groove 40 on the hole in the fixing rod 36, which further enhances the stability of the connection;

[0136] The rubber pad 24 and the fastening spring 32 keep the fixing rod 36 in the center position of the fixing sleeve 31, preventing the overall vibration caused by the fan rotation from causing the fixing to fall off.

[0137] The fixed component setup ensures both the convenience and stability of the fan connection.

[0138] Example 7

[0139] A design method for a low-power single-phase centrifugal fan, comprising the following steps:

[0140] S1: Determine the outer diameter of impeller 14 and the number of blades based on the predetermined air volume;

[0141] S2: Determine the number of turns of winding 2 based on the outer diameter of impeller 14, the number of blades of impeller 14, and the magnetic field strength of magnetic strip 13.

[0142] The working principle and beneficial effects of the above scheme are as follows:

[0143] By designing the wind turbine using the above method, the number of winding turns can be minimized while ensuring that the wind turbine achieves the desired effect, which is beneficial to saving costs.

[0144] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A low-power single-phase centrifugal fan, characterized in that, It includes a stator (1), a shaft (5) is rotatably connected in the middle of the stator (1), an impeller (14) is connected on the shaft (5), a magnetic strip (13) is provided on the motor housing (12) inside the impeller (14), and a winding (2) is provided on the outer periphery of the stator (1); The shaft core (5) and the impeller (14) are connected by a transmission assembly; The impeller (14) is provided with a balancing mud placement area (15); The transmission assembly includes a positioning sleeve (43), which is fixedly connected to the shaft core (5). The positioning sleeve (43) is inserted into the connecting sleeve (41), and the outer periphery of the connecting sleeve (41) is fixedly connected to the impeller (14). The positioning sleeve (43) is provided with a first limiting tooth (44); The positioning sleeve (43) is fixedly connected to a first locking tooth (45), and a stabilizing ring (46) is fixedly connected to the outer periphery of the first locking tooth (45); A linkage bowl (49) is slidably connected inside the positioning sleeve (43). The linkage bowl (49) is slidably connected to the slot (47). A connecting ring (52) is provided inside the linkage bowl (49). The connecting ring (52) is fixedly connected to the inner wall of the linkage bowl (49) through the second limiting tooth (53). Several sets of second locking teeth (51) are rotatably connected to the inner wall of the connecting ring (52). A third locking tooth (54) is fixedly connected to the second locking tooth (51). The linkage bowl (49) is provided with a groove that is compatible with the first limiting tooth (44); An adjusting rod (42) is inserted into the linkage bowl (49). The adjusting rod (42) is fixedly connected to a fourth locking tooth (55) at the position inside the linkage bowl (49). The fourth locking tooth (55) is compatible with the third locking tooth (54). A positioning rod (50) is fixedly connected to one end of the adjusting rod (42) facing the positioning sleeve (43); The adjusting rod (42) is fitted with a spring (48), and the two ends of the spring (48) abut against the ports of the linkage cup (49) and the connecting sleeve (41), respectively. An elastic element is provided between the fourth locking tooth (55) and the linkage bowl (49), and the elastic element is sleeved on the adjusting rod (42); The adjacent end faces of the third tooth (54) and the fourth tooth (55) are inclined surfaces, and the sides of the third tooth (54) and the fourth tooth (55) are also inclined surfaces; The cross-section of the adjusting rod (42) is non-circular.

2. The low-power single-phase centrifugal fan according to claim 1, characterized in that, The stator (1) is mounted on the bracket (20), the bracket (20) has a bracket tube (3) in the middle, the bracket tube (3) has silicon steel sheets (23) on its outer periphery, and the silicon steel sheets (23) have windings (2) mounted on them. An upper insulating cover (4) and a lower insulating cover (22) are provided between the silicon steel sheet (23) and the winding (2), and the upper insulating cover (4) and the lower insulating cover (22) are located on the upper and lower sides of the silicon steel sheet (23); A shaft core (5) is rotatably connected inside the bracket tube (3). An oil-impregnated bearing (17) is provided between the shaft core (5) and the bracket tube (3). The oil-impregnated bearing (17) is sleeved on the shaft core (5).

3. A low-power single-phase centrifugal fan according to claim 2, characterized in that, An iron shell (27) is installed inside the tube (3) of the support, a strong magnet (28) is installed inside the iron shell (27), and a wear-resistant plate (26) is installed on the strong magnet (28); The lower end of the shaft core (5) is provided with an impeller shaft core mushroom head (25), which abuts against the wear-resistant plate (26); A retaining ring (29) is fastened to the top of the iron shell (27), and the retaining ring (29) is located above the mushroom head (25) of the impeller shaft core; A washer (30) is provided above the retaining ring (29). The retaining ring (29) and the washer (30) are fitted onto the connection between the impeller shaft core mushroom head (25) and the oil-impregnated bearing (17). An upper insulating cover (4) is provided at the upper end of the bracket tube (3), and the shaft core (5) passes through the upper insulating cover (4), and the shaft core (5) is rotatably connected to the upper insulating cover (4); The lower surface of the upper insulating cover (4) is provided with an upper insulating cover top seat (7), and the lower end of the upper insulating cover top seat (7) abuts against the upper end of the oil-impregnated bearing (17); The gaps inside the tube (3) of the support are filled with lubricating oil (16).

4. A low-power single-phase centrifugal fan according to claim 1, characterized in that, The impeller (14) has a concave cavity in the middle, and the impeller shaft core rubber-coated position (6) is provided in the middle of the cavity of the impeller (14). The shaft core (5) is connected to the impeller shaft core rubber-coated position (6). A motor housing (12) is provided inside the cavity of the impeller (14), and a magnetic strip (13) is provided on the inner wall of the motor housing (12).

5. A low-power single-phase centrifugal fan according to claim 2, characterized in that, A circuit board (19) is fixedly connected to the bracket (20), and the circuit board (19) is electrically connected to the winding (2) through the pin (18); A wire buckle (21) is provided on the bracket (20); A rubber pad (24) is provided on the bracket (20).

6. A low-power single-phase centrifugal fan according to claim 2, characterized in that, A rib (8) is provided between the impeller (14) and the motor housing (12); The impeller (14) has a second rib (9) on its center surface; A reinforcing bar (10) is provided between the outer side of the support tube (3) and the silicon steel sheet (23); A rib (11) is provided between the inner side of the support tube (3) and the oil-impregnated bearing (17).

7. A low-power single-phase centrifugal fan according to claim 2, characterized in that, The bracket (20) is fixed to the outside through a fixing component, which includes a fixing sleeve (31) and a fixing rod (36). A fixing block (34) is fixedly connected inside the fixing sleeve (31), and a card (35) is fixedly connected on the fixing block (34). A fastening spring (32) is provided on the outside of the card (35). The fastening spring (32) is provided on the inner wall of the fixing sleeve (31). A limit ring (33) is provided at the opening of the fixing sleeve (31), and a card hole is provided on the side wall of the fixing sleeve (31). A locking plate (37) is fixedly connected to the fixing rod (36), the locking plate (37) has a notch, the fixing rod (36) has a hole, and the hole in the fixing rod (36) has a groove (40), and a knob position (39) is fixedly connected to the fixing rod (36). A limit plate (38) is fixedly connected to the fixed rod (36).

8. A design method for a low-power single-phase centrifugal fan, characterized in that, The method for designing a low-power single-phase centrifugal fan as described in any one of claims 1-7 includes the following steps: S1: Determine the outer diameter of the impeller (14) and the number of blades according to the predetermined air volume; S2: Determine the number of turns of winding (2) based on the outer diameter of impeller (14), the number of blades of impeller (14) and the magnetic field strength of magnetic strip (13).

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