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

Abstract

The invention discloses a low-power-consumption single-phase centrifugal fan, and relates to the technical field of ventilation, the middle part of a stator is connected with a shaft core, the shaft core is connected with an impeller, a motor shell in the impeller is provided with a magnetic strip, and the periphery of the stator is provided with a winding; the shaft core is connected with the impeller through a transmission assembly; and a balance mud placing area is arranged on the impeller. When the shaft core and the impeller are connected, the transmission assembly is adopted, so that the gravity center of the rotating part of the fan falls on the shaft core, and the problems of vibration, uneven stress of a central rotating shaft and the like caused by power transmission through the central rotating shaft with a semicircular section in the prior art are solved; the impeller is provided with the balance mud placing area, the position of the gravity center of the rotating part of the fan is finely adjusted, and the gravity center of the rotating part of the fan is further ensured to be located on the shaft core. The design method comprises the steps that impeller outer diameter and blade number are determined according to preset air volume; the number of windings is determined according to the impeller outer diameter, the impeller blade number and the magnetic field intensity of the magnetic strips. The number of turns of the winding is minimized while the fan achieves a predetermined effect, and the cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of ventilation, and in particular to a low-power single-phase centrifugal fan and a design method thereof. Background Art

[0002] Single-phase motor refers to an asynchronous motor that is 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 used in large quantities in production, but are also closely related to people's daily lives. Especially with the improvement of people's living standards, the use of single-phase motors in household electrical appliances is also increasing.

[0003] In Chinese patent application number CN202222995719.6, a micro brushless four-slot four-pole motor device is disclosed, 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 arranged on the iron core rotor, the iron core stator is fixedly arranged in the housing and surrounded by the iron core rotor, and the coil is arranged on the iron core stator; a limiting groove is arranged 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 be rotated in the limiting groove by a certain angle to constrain the rotation amplitude of the central shaft. The central shaft of the micro brushless four-slot four-pole motor device of the utility model is not provided with spring plates at both ends, and the deflection angle of the central shaft is limited by the interference between the end of the central shaft and the housing. Compared with the spring plate structure, it can more accurately control the rotation amplitude of the central shaft, and will not affect the performance and service life with the increase of the number of uses.

[0004] The central shaft for external connection set in the above patent adopts a notch design. The central shaft with a semicircular cross-section transmits power. However, since the output end of the central shaft is partially missing, 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 the motor to vibrate and the center shaft to be unevenly stressed. Summary of the invention

[0005] The present invention provides a low-power single-phase centrifugal fan and a design method thereof, so as to solve the problems raised in the background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A low-power single-phase centrifugal fan comprises a stator, a shaft core is rotatably connected to the middle of the stator, an impeller is connected to the shaft core, a magnetic strip is arranged on the motor shell in the impeller, and a winding is arranged on the outer periphery of the stator;

[0008] The shaft core is connected to the impeller through a transmission assembly;

[0009] A balancing mud placement area is provided on the impeller.

[0010] Preferably, the stator is arranged on a bracket, a bracket middle tube is arranged in the middle of the bracket, a silicon steel sheet is arranged on the periphery of the bracket middle tube, and a winding is arranged on the silicon steel sheet;

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

[0012] An axle core is rotatably connected in the middle tube of the bracket, an oil-containing bearing is arranged between the axle core and the middle tube of the bracket, and the oil-containing bearing is sleeved on the axle core.

[0013] Preferably, an iron shell is provided in the middle tube of the bracket, a strong magnet is provided in the iron shell, and a wear-resistant sheet is provided on the strong magnet;

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

[0015] A buckle ring is buckled and connected above the iron shell, and the buckle ring is located above the mushroom head of the impeller shaft core;

[0016] A washer is arranged above the buckle ring, and the buckle ring and the washer are sleeved on the connection between the mushroom head of the impeller shaft core and the oil-containing bearing;

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

[0018] An upper insulating cover top seat is provided on the lower surface of the upper insulating cover, and the lower end of the upper insulating cover top seat abuts against the upper end of the oil-containing bearing;

[0019] The gap inside the tube in the bracket is filled with lubricating oil.

[0020] Preferably, a concave cavity is provided in the middle of the impeller, an impeller shaft core rubber coating position is provided in the middle of the impeller cavity, and the shaft core is connected to the impeller shaft core rubber coating position;

[0021] A motor shell is arranged in the cavity of the impeller, and a magnetic strip is arranged on the inner wall of the motor shell.

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

[0023] A wire buckle is provided on the bracket;

[0024] A rubber pad is arranged on the bracket.

[0025] Preferably, a rib 1 is provided between the impeller and the motor housing;

[0026] The central surface of the impeller is provided with rib 2;

[0027] A rib three is arranged between the outer side of the middle tube of the bracket and the silicon steel sheet;

[0028] A rib four is arranged between the inner side of the middle tube of the bracket and the oil-containing bearing.

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

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

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

[0032] A linkage bowl is slidably connected in the positioning sleeve, and the linkage bowl is slidably connected to the clamping groove. A connecting ring is arranged in the linkage bowl, and the connecting ring is fixedly connected to the inner wall of the linkage bowl through the second limiting teeth. A plurality of groups of second clamping teeth are rotatably connected to the inner wall of the connecting ring, and a third clamping tooth is fixedly connected to the second clamping teeth.

[0033] A groove adapted to the first limiting tooth is arranged in the linkage bowl;

[0034] An adjusting rod is inserted in the linkage bowl, and a fourth latching tooth is fixedly connected to the position of the adjusting rod in the linkage bowl, and the fourth latching tooth is adapted to the third latching tooth;

[0035] One end of the adjusting rod facing the positioning sleeve is fixedly connected with a positioning rod;

[0036] The outer sleeve of the adjusting rod is connected with a spring, and the two ends of the spring are respectively in contact with the linkage bowl and the connecting sleeve port;

[0037] An elastic member is arranged between the fourth latching tooth and the linkage bowl, and the elastic member is sleeved on the adjusting rod;

[0038] The adjacent end surfaces of the third latching tooth and the fourth latching tooth are inclined surfaces, and the side surfaces of the third latching tooth and the fourth latching tooth are inclined surfaces;

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

[0040] Preferably, the bracket is fixed to the outside through a fixing assembly, the fixing assembly includes a fixing sleeve and a fixing rod, a fixing block is fixedly connected inside the fixing sleeve, a card is fixedly connected to the fixing block, a fastening spring is arranged on the outer side of the card, the fastening spring is arranged on the inner wall of the fixing sleeve, a limiting ring is arranged at the opening of the fixing sleeve, and a card hole is arranged on the side wall of the fixing sleeve;

[0041] A clamping plate is fixedly connected to the fixing rod, a notch is arranged on the clamping plate, a hole is arranged in the fixing rod, a groove is arranged on the hole in the fixing rod, and a knob is fixedly connected to the fixing rod;

[0042] A limiting plate is fixedly connected to the fixing rod.

[0043] A design method for a low-power single-phase centrifugal fan is provided, which is used to design a low-power single-phase centrifugal fan, and comprises the following steps:

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

[0045] S2: Determine the number of winding turns based on the outer diameter of the impeller, 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] The present application adopts a transmission assembly 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, solving the problems of vibration and uneven force on the central shaft caused by the power transmission through the central shaft with a semicircular cross-section in the prior art;

[0048] In addition, the present application provides a balancing mud placement area on the impeller, and fine-tunes the position of the center of gravity of the rotating part of the fan by placing balancing mud in the balancing mud placement area, further ensuring that the center of gravity of the rotating part of the fan is on the shaft core. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0051] Figure 3 It is a partial cross-sectional schematic diagram of the main structure of the present invention;

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

[0053] Figure 5 It is a left side schematic diagram of the main structure of the present invention;

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

[0055] Figure 7 It is a cross-sectional schematic diagram of the main structure of the present invention with the fan blade magnetic ring hidden;

[0056] Figure 8 It is a front view schematic diagram of the main structure of the present invention with the fan blade magnetic ring hidden;

[0057] Fig. 9 It is a cross-sectional schematic diagram of the main structure of the present invention with the fan blade magnetic ring and the insulating cover hidden;

[0058] Fig.10 It is a front view schematic diagram of the main structure of the present invention with the fan blade magnetic ring and the insulating cover hidden;

[0059] Fig.11 It is an exploded schematic diagram of the fixing component structure of the present invention;

[0060] Fig.12 It is a schematic cross-sectional view of the fixing assembly structure of the present invention;

[0061] Fig.13 It is a partial structural schematic diagram of the fixing assembly of the present invention;

[0062] Fig.14 It is a schematic diagram of the transmission assembly structure of the present invention;

[0063] Fig.15 It is a schematic cross-sectional view of the transmission assembly structure of the present invention;

[0064] Fig.16 It is a schematic diagram of the local structure of the transmission assembly of the present invention;

[0065] Fig.17 It is a schematic diagram of the local structural coordination of the transmission assembly of the present invention.

[0066] In the figure: 1. stator; 2. winding; 3. bracket middle tube; 4. upper insulating cover; 5. shaft core; 6. impeller shaft core rubber package; 7. upper insulating cover top seat; 8. rib one; 9. rib two; 10. rib three; 11. rib four; 12. motor housing; 13. magnetic strip; 14. impeller; 15. balance mud placement area; 16. lubricating oil; 17. oil-containing bearing; 18. pin; 19. circuit board; 20. bracket; 21. wire buckle; 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. Strong magnet; 29, buckle; 30, gasket; 31, fixing sleeve; 32, fastening spring; 33, limiting ring; 34, fixing block; 35, card; 36, fixing rod; 37, positioning plate; 38, limiting plate; 39, knob position; 40, groove; 41, connecting sleeve; 42, adjusting rod; 43, positioning sleeve; 44, first limiting tooth; 45, first clamping tooth; 46, stabilizing ring; 47, clamping groove; 48, spring; 49, linkage bowl; 50, positioning rod; 51, second clamping tooth; 52, connecting ring; 53, second limiting tooth; 54, third clamping tooth; 55, fourth clamping tooth. DETAILED DESCRIPTION

[0067] In the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish the protective components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0068] Example 1

[0069] See also Figure 1-10 , an embodiment provided by the present invention: a low-power single-phase centrifugal fan, comprising a stator 1, a shaft core 5 is rotatably connected to the middle of the stator 1, an impeller 14 is connected to the shaft core 5, a magnetic strip 13 is arranged on the motor housing 12 in the impeller 14, and a winding 2 is arranged on the outer periphery of the stator 1;

[0070] The shaft core 5 is connected to the impeller 14 through 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:

[0073] The present application adopts 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 power transmission through the central shaft with a semicircular cross-section in the prior art;

[0074] In addition, the present application sets a balancing mud placement area 15 on the impeller 14, and fine-tunes the position of the center of gravity of the rotating part of the fan by placing balancing mud in the balancing mud placement area 15, further ensuring that the center of gravity of the rotating part of the fan is on the shaft core 5.

[0075] Example 2

[0076] See also Figure 1-10 On the basis of Example 1, six groups of windings 2 are provided, and the six groups of windings 2 are connected in series.

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

[0078] Compared with the traditional four-slot four-pole design, the design of the six groups of windings 2 in the present application has more slots, a higher slot fill rate, and better slot matching, which is beneficial to improving the distribution of the air gap magnetic field, reducing (iron loss) eddy current loss and hysteresis loss, and improving the efficiency and power factor of the motor. The slot-pole matching can reduce iron loss and copper loss, optimize the overall energy efficiency of the motor, and can greatly reduce the operating power and improve energy utilization while ensuring the same air volume, wind pressure and noise and in a single-phase power supply environment. It has significant environmental protection and energy-saving effects and economic value.

[0079] Example 3

[0080] See also Figure 1-10 On the basis of Embodiment 1-2, the stator 1 is arranged on the bracket 20, a bracket middle tube 3 is arranged in the middle of the bracket 20, a silicon steel sheet 23 is arranged on the periphery of the bracket middle tube 3, and a winding 2 is arranged on the silicon steel sheet 23;

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

[0082] An axle core 5 is rotatably connected in the middle tube 3 of the bracket. An oil-containing bearing 17 is arranged between the axle core 5 and the middle tube 3 of the bracket. The oil-containing bearing 17 is sleeved on the axle core 5 .

[0083] An iron shell 27 is arranged in the middle tube 3 of the bracket, a strong magnet 28 is arranged in the iron shell 27, and a wear-resistant sheet 26 is arranged on the strong magnet 28;

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

[0085] A buckle ring 29 is buckled and connected above the iron shell 27, and the buckle ring 29 is located above the mushroom head 25 of the impeller shaft core;

[0086] A washer 30 is arranged above the retaining ring 29, and the retaining ring 29 and the washer 30 are sleeved on the connection between the impeller shaft core mushroom head 25 and the oil-containing bearing 17;

[0087] The buckle 29 and the washer 30 are both made of Mylar material;

[0088] An upper insulating cover 4 is provided at the upper end of the bracket middle 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;

[0089] An upper insulating cover top seat portion 7 is provided on the lower surface of the upper insulating cover 4, and the lower end of the upper insulating cover top seat portion 7 abuts against the upper end of the oil-containing bearing 17;

[0090] The gap inside the tube 3 in the bracket is filled with lubricating oil 16 .

[0091] An inwardly concave cavity is provided in the middle of the impeller 14, an impeller shaft core rubber encapsulation position 6 is provided in the middle of the cavity of the impeller 14, and the shaft core 5 is connected to the impeller shaft core rubber encapsulation position 6;

[0092] A motor housing 12 is disposed in 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 via the pins 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:

[0097] The winding 2 is placed in the magnetic field formed by the magnetic strip 13, and the circuit board 19 controls the power supply to the winding 2, and the current direction is constantly changed. The flowing current generates a magnetic field between the windings 2, and the winding 2 is repelled by the magnetic strip 13 on one side and attracted by the magnetic strip 13 on the other side, and rotates continuously under this effect. During the rotation process, the current in the coil is reversed to make it rotate continuously.

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

[0099] Among them, the retaining ring 29 is arranged at the connection between the impeller shaft core mushroom head 25 and the oil-containing bearing 17, which effectively fixes the shaft core 5 and prevents the impeller 14 from falling off;

[0100] The wear-resistant sheet 26 is used to support the impeller shaft core mushroom head 25 to prevent the impeller shaft core mushroom head 25 from rubbing against the strong magnet 28;

[0101] The iron shell 27 is provided to shield the outflowing magnetic field and guide the effective magnetic field.

[0102] Example 4

[0103] See also Figure 2 On the basis of Embodiment 1-3, a rib 8 is provided between the impeller 14 and the motor housing 12;

[0104] The central surface of the impeller 14 is provided with ribs 9;

[0105] A rib 10 is provided between the outer side of the bracket middle tube 3 and the silicon steel sheet 23;

[0106] A rib 11 is arranged between the inner side of the bracket middle tube 3 and the oil-containing bearing 17.

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

[0108] The rib 18 is used to tightly fit the motor housing 12 and the impeller 14 to prevent the magnetic strip 13 from falling off and loosening in the impeller 14;

[0109] The rib 9 is used to prevent the center surface of the impeller 14 from deforming;

[0110] The ribs 3 are used to prevent the stator 1 and the bracket middle tube 3 from falling off and loosening;

[0111] The ribs 4 are used to prevent the oil-containing bearing 17 from falling off and loosening in the bracket middle tube 3.

[0112] Example 5

[0113] See also Figure 14-17 On the basis of embodiments 1-4, the transmission assembly includes a positioning sleeve 43, the positioning sleeve 43 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;

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

[0115] A first latching 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 latching tooth 45;

[0116] A linkage bowl 49 is slidably connected in the positioning sleeve 43, and the linkage bowl 49 is slidably connected to the clamping groove 47. A connecting ring 52 is arranged in the linkage bowl 49, and the connecting ring 52 is fixedly connected to the inner wall of the linkage bowl 49 through the second limiting teeth 53. A plurality of groups of second clamping teeth 51 are rotatably connected to the inner wall of the connecting ring 52, and the second clamping teeth 51 are fixedly connected to the third clamping teeth 54.

[0117] A groove adapted to the first limiting tooth 44 is provided in the linkage bowl 49;

[0118] The linkage bowl 49 is plugged with an adjusting rod 42, and the position of the adjusting rod 42 in the linkage bowl 49 is fixedly connected with a fourth latching tooth 55, and the fourth latching tooth 55 is adapted to the third latching tooth 54;

[0119] One end of the adjusting rod 42 facing the positioning sleeve 43 is fixedly connected with a positioning rod 50;

[0120] The outer sleeve of the adjusting rod 42 is connected with a spring 48, and the two ends of the spring 48 are respectively in contact with the linkage bowl 49 and the ends of the connecting sleeve 41;

[0121] An elastic member is disposed between the fourth latching tooth 55 and the linkage bowl 49, and the elastic member is sleeved on the adjusting rod 42;

[0122] The adjacent end surfaces of the third latching tooth 54 and the fourth latching tooth 55 are inclined surfaces, and the side surfaces of the third latching tooth 54 and the fourth latching tooth 55 are inclined surfaces;

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

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

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

[0126] Since the adjusting rod 42 is pulled out, the second latch teeth 51 and the third latch teeth 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 on the positioning sleeve 43, each group of first latch teeth 45 is inserted between adjacent second latch teeth 51. After that, the adjusting rod 42 is released. Under the action of the elastic member, the fourth latch teeth 55 are inserted between the third latch teeth 54. Since the end faces of the third latch teeth 54 and the fourth latch teeth 55 are inclined surfaces, when the fourth latch teeth 55 are inserted between the third latch teeth 54, the fourth latch teeth 55 will drive the third latch teeth 54 to rotate to complete the insertion, thereby driving the second latch teeth 51 to rotate, and the second latch teeth 51 are engaged with the first latch teeth 45, which effectively prevents the positioning sleeve 43 and the connecting sleeve 41 from falling off, that is, it ensures that the shaft core 5 and the impeller 14 are fixed relatively stably.

[0127] The central symmetric structure of the transmission assembly makes the center of gravity of the rotating part of the fan fall on the shaft core 5, which solves the problems of vibration and uneven force on the central shaft caused by the power transmission through the central shaft with a semicircular cross-section in the prior art;

[0128] When the impeller 14 fails and the resistance of the shaft core 5 is too large, exceeding the rated power of the fan, relative sliding occurs between the third latch tooth 54 and the fourth latch tooth 55, limiting the maximum bearing capacity of the shaft core 5, effectively protecting the fan and preventing the fan from being overloaded and causing losses.

[0129] Example 6

[0130] See also Figure 11-13 On the basis of embodiments 1-5, the bracket 20 is fixed to the outside through a fixing assembly, the fixing assembly 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 arranged outside the card 35, the fastening spring 32 is arranged on the inner wall of the fixing sleeve 31, a limiting ring 33 is arranged at the opening of the fixing sleeve 31, and a card hole is arranged on the side wall of the fixing sleeve 31;

[0131] The fixing rod 36 is fixedly connected with a locking plate 37, the locking plate 37 is provided with a notch, a hole is provided in the fixing rod 36, and a groove 40 is provided in the hole in the fixing rod 36, and a knob 39 is fixedly connected with the fixing rod 36;

[0132] The fixing rod 36 is fixedly connected to a limiting plate 38 .

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

[0134] The rubber pad 24 is inserted into the fixing rod 36, and the rubber pad 24 is passed through the fixing position, and the fixing rod 36 is inserted into the fixing sleeve 31 through the limiting plate 38, and the knob position 39 is turned 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, and the locking is completed;

[0135] The elastic card 35 is snapped into the groove 40 on the hole in the fixing rod 36 to further enhance the stability of the connection;

[0136] The setting of the rubber pad 24 and the fastening spring 32 maintains the fixing rod 36 at the center position of the fixing sleeve 31, preventing the fan from rotating and causing overall vibration, which may cause the fixing to fall off;

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

[0138] Example 7

[0139] A design method for a low-power single-phase centrifugal fan is provided, which is used to design a low-power single-phase centrifugal fan, and comprises the following steps:

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

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

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

[0143] By designing the fan using the above method, the number of turns of winding 2 is minimized while ensuring that the fan achieves the desired effect, which is beneficial to saving costs.

[0144] It will be apparent to those skilled in the art that the 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 the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A low-power single-phase centrifugal fan, characterized in that: It comprises a stator (1), a shaft core (5) is rotatably connected to the middle of the stator (1), an impeller (14) is connected to the shaft core (5), a magnetic strip (13) is arranged on a motor housing (12) inside the impeller (14), and a winding (2) is arranged on the outer periphery of the stator (1); The shaft core (5) is connected to the impeller (14) via a transmission assembly; The impeller (14) is provided with a balancing mud placement area (15).

2. A low-power single-phase centrifugal fan according to claim 1, characterized in that: The stator (1) is arranged on a bracket (20), a bracket middle tube (3) is arranged in the middle of the bracket (20), a silicon steel sheet (23) is arranged on the outer periphery of the bracket middle tube (3), and a winding (2) is arranged on the silicon steel sheet (23); 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); An axle core (5) is rotatably connected inside the bracket middle tube (3), an oil-containing bearing (17) is arranged between the axle core (5) and the bracket middle tube (3), and the oil-containing bearing (17) is sleeved on the axle core (5).

3. A low-power single-phase centrifugal fan according to claim 2, characterized in that: An iron shell (27) is arranged in the middle tube (3) of the bracket, a strong magnet (28) is arranged in the iron shell (27), and a wear-resistant sheet (26) is arranged on the strong magnet (28); An impeller shaft core mushroom head (25) is provided at the lower end of the shaft core (5), and the impeller shaft core mushroom head (25) abuts against the wear-resistant sheet (26); A buckle ring (29) is buckled and connected above the iron shell (27), and the buckle ring (29) is located above the mushroom head (25) of the impeller shaft core; A washer (30) is arranged above the retaining ring (29), and the retaining ring (29) and the washer (30) are sleeved on the connection between the impeller shaft core mushroom head (25) and the oil-containing bearing (17); An upper insulating cover (4) is provided at the upper end of the bracket middle tube (3), 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); An upper insulating cover top seat portion (7) is provided on the lower surface of the upper insulating cover (4), and the lower end of the upper insulating cover top seat portion (7) abuts against the upper end of the oil-containing bearing (17); The gap inside the bracket middle tube (3) is filled with lubricating oil (16).

4. A low-power single-phase centrifugal fan according to claim 1, characterized in that: An inwardly concave cavity is provided in the middle of the impeller (14), an impeller shaft core rubber coating position (6) is provided in the middle of the cavity of the impeller (14), and the shaft core (5) is connected to the impeller shaft core rubber coating position (6); A motor housing (12) is arranged in the cavity of the impeller (14), and a magnetic strip (13) is arranged 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) via a 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 central surface of the impeller (14) is provided with a rib 2 (9); A rib three (10) is provided between the outer side of the bracket middle tube (3) and the silicon steel sheet (23); A rib four (11) is arranged between the inner side of the bracket middle tube (3) and the oil-containing bearing (17).

7. A low-power single-phase centrifugal fan according to claim 1, characterized in that: The transmission assembly comprises a positioning sleeve (43), the positioning sleeve (43) 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).

8. A low-power single-phase centrifugal fan according to claim 7, characterized in that: A first latching 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 latching tooth (45); A linkage bowl (49) is slidably connected inside the positioning sleeve (43), and the linkage bowl (49) is slidably connected to the clamping groove (47). A connecting ring (52) is arranged inside the linkage bowl (49), and the connecting ring (52) is fixedly connected to the inner wall of the linkage bowl (49) through a second limiting tooth (53). The inner wall of the connecting ring (52) is rotatably connected to a plurality of groups of second clamping teeth (51), and the second clamping teeth (51) are fixedly connected to third clamping teeth (54); A groove adapted to the first limiting tooth (44) is arranged in the linkage bowl (49); An adjusting rod (42) is inserted into the linkage bowl (49), and a fourth latching tooth (55) is fixedly connected to the position of the adjusting rod (42) located in the linkage bowl (49), and the fourth latching tooth (55) is adapted to the third latching tooth (54); One end of the adjusting rod (42) facing the positioning sleeve (43) is fixedly connected with a positioning rod (50); The outer sleeve of the adjusting rod (42) is connected with a spring (48), and the two ends of the spring (48) are respectively in contact with the linkage bowl (49) and the ports of the connecting sleeve (41); An elastic member is provided between the fourth latching tooth (55) and the linkage bowl (49), and the elastic member is sleeved on the adjusting rod (42); The adjacent end surfaces of the third latching tooth (54) and the fourth latching tooth (55) are inclined surfaces, and the side surfaces of the third latching tooth (54) and the fourth latching tooth (55) are inclined surfaces; The cross section of the adjusting rod (42) is non-circular.

9. 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, the fixing component comprising 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 arranged outside the card (35), the fastening spring (32) is arranged on the inner wall of the fixing sleeve (31), a limiting ring (33) is arranged at the opening of the fixing sleeve (31), and a card hole is arranged on the side wall of the fixing sleeve (31); A locking plate (37) is fixedly connected to the fixing rod (36), a notch is provided on the locking plate (37), a hole is provided in the fixing rod (36), a groove (40) is provided in the hole in the fixing rod (36), and a knob (39) is fixedly connected to the fixing rod (36); A limiting plate (38) is fixedly connected to the fixing rod (36).

10. A design method for a low-power single-phase centrifugal fan, characterized in that: A method for designing a low-power single-phase centrifugal fan as claimed in any one of claims 1 to 9 comprises the following steps: S1: determining the outer diameter and number of blades of the impeller (14) according to a predetermined air volume; S2: Determine the number of turns of the winding (2) according to the outer diameter of the impeller (14), the number of blades of the impeller (14) and the magnetic field strength of the magnetic strip (13).

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