Direct-current fan impeller structure and direct-current fan with same

Abstract

The direct-current fan impeller structure comprises a centrifugal impeller rotationally arranged in an impeller cavity of a fan shell, the centrifugal impeller comprises a balance panel arranged at the top of the centrifugal impeller and a center hole formed in the middle of the balance panel, the balance panel protrudes by a certain height in a circular ring shape, and the center hole is formed in the middle of the balance panel. According to the centrifugal impeller, during a dynamic balance test, the dynamic balance of the centrifugal impeller is trimmed by cutting down or polishing the plurality of balance bumps, so that the dynamic balance condition of the impeller is effectively improved, and the dynamic balance adjusting function of the impeller is realized; according to the technical scheme, the dynamic balance adjustment mode of the centrifugal impeller is simple, controllability is good, precision adjustment is higher, and detection and debugging are convenient, so that the vibration problem caused by unbalance of the centrifugal impeller is solved, the dynamic balance performance of the impeller reaches the standard, and the product quality and the use performance of a draught fan are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to an impeller structure of a DC fan and a DC fan with the same. Background Art

[0002] A fan is usually configured in a gas water heater. Through the fan, air and gas can be blown into the combustion chamber in a certain proportion for full combustion, and the waste gas and waste heat generated during the use of the water heater can also be discharged through the fan. With the continuous development of the technology of electronic and electrical equipment, the fan industry is gradually developing towards the trend of performance optimization and high reliability. During the production, manufacturing, operation and use of existing fans, the problem of impeller imbalance will occur. The impeller imbalance will cause severe vibration during the operation of the fan, resulting in excessive wear on the rotor shaft and the shaft sleeve, which will affect the performance and service life of the fan. Therefore, in the existing dynamic balance test of the impeller, usually artificial adjustment and weighting are carried out by adding configuration blocks to the impeller, so that the impeller reaches the dynamic balance state again. The counterweight blocks can be clamped on the blades, or the counterweight blocks can be arranged in the configuration holes of the impeller. This method requires manual adjustment of each direction of the impeller and continuous adjustment of the weight gain in a single direction. The adjustment operation method of this configuration block is complex, the work efficiency is low, and the adjustment error is large, which will affect the product quality. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the problem that in the prior art, the impeller reaches the dynamic balance state again by adding configuration blocks, and the adjustment operation method of this configuration block is complex, the work efficiency is low, and it will affect the product quality.

[0004] To solve the above technical problem, the utility model provides an impeller structure of a DC fan, which includes a centrifugal impeller rotatably arranged in an impeller cavity of a fan housing. The centrifugal impeller includes a balance panel arranged at its top and a central hole opened in the middle of the balance panel. The balance panel is arranged in a circular ring shape and bulges a certain height. The impeller structure also includes a plurality of balance bumps formed at intervals along the circumference on the balance panel. When the dynamic balance test of the centrifugal impeller is carried out, the dynamic balance of the impeller is adjusted by cutting or grinding a plurality of balance bumps.

[0005] As a preferred scheme, a plurality of balance bumps are respectively a plurality of circular protrusions integrally formed on the balance panel.

[0006] As a preferred scheme, the centrifugal impeller includes a lower bottom plate opposite to the central hole, and a plurality of arc-shaped blades arranged between the lower bottom plate and the balance panel. The plurality of arc-shaped blades are arranged in a circular array around the central hole.

[0007] As a preferred solution, the centrifugal impeller is driven by a rotating shaft of the driving structure, the lower base plate is provided with a connecting boss, and a coupling hole cooperating with the rotating shaft is provided between the connecting boss and the lower base plate.

[0008] As a preferred solution, the inner wall of the coupling hole is provided with a limiting plane extending along its axial direction, and the rotating shaft has a semi-axial portion that fits with the limiting plane.

[0009] As a preferred solution, it includes a housing, a driving structure and any one of the DC fan impeller structures described above.

[0010] As a preferred solution, the fan housing includes a base, an upper cover and a rear cover, and the base and the upper cover cooperate to form an impeller cavity and a blowing channel connected to the impeller cavity.

[0011] As a preferred solution, a premixing joint is provided on the top of the upper cover, the premixing joint and the central hole of the centrifugal impeller are arranged opposite to each other up and down, and a sealing ring is provided between the premixing joint and the upper cover.

[0012] As a preferred solution, the base and the back cover cooperate to form an installation cavity for installing the drive structure, the drive structure includes a stator assembly, a rotor and a rotating shaft, the rotating shaft is linked to the rotor, the stator assembly includes a central cavity suitable for accommodating the rotor, and two positioning rings relatively fixed at both ends of the central cavity, and two bearing structures concentrically arranged on the two positioning rings and matched with the rotating shaft, the rotating shaft is linked to the rotor, the rotating shaft penetrates into the impeller cavity and cooperates with the coupling hole of the centrifugal impeller to transmit torque, and one end of the rotating shaft is locked with a locking piece after passing through the coupling hole.

[0013] As a preferred solution, a sealing groove is provided on the bottom edge of the contour where the upper cover is connected to the base, a layer of sealant is poured in the sealing groove, and a sealing convex edge matching and inserted in the sealing groove is provided on the top surface of the base.

[0014] Compared with the prior art, the technical solution of the utility model has the following advantages:

[0015] 1. In the structure of the DC fan impeller provided by the present utility model, a balance panel in the shape of a ring is provided at the top of the centrifugal impeller, and a number of balance cams are arranged at intervals along the circumference on the balance panel. The distribution is reasonable and uniform. During the dynamic balance test of the centrifugal impeller by the dynamic balance test equipment, the self-dynamic balance of the centrifugal impeller can be adjusted by cutting or grinding a number of balance bumps. Since the balance bumps will change the balance weight relationship of the impeller in different orientations after being cut or ground, the dynamic balance condition of the impeller is effectively improved, thereby realizing the function of adjusting the dynamic balance of the impeller. At the same time, the traditional method of adding counterweight blocks is also avoided. The dynamic balance adjustment method of the centrifugal impeller adopting this technical solution is relatively simple, has good controllability, higher precision adjustment, is convenient for detection and debugging, thus overcoming the vibration problem caused by the imbalance of the centrifugal impeller, making the dynamic balance performance of the impeller meet the standard, and thus ensuring the product quality and service performance of the fan.

[0016] 2. In the structure of the DC fan impeller provided by the present utility model, a number of balance bumps are respectively a number of circular protrusions integrally formed on the balance panel. The integrally formed structure has good stability, so that a number of balance bumps are pre-uniformly distributed on the balance panel of the centrifugal impeller. These balance bumps are designed into a circular structure, which is more regular and balanced, is beneficial to reducing errors, and has less resistance to the operation of the impeller. When the impeller has poor dynamic imbalance during operation, it is necessary to perform dynamic balance test and adjustment on the centrifugal impeller. By grinding or cutting the balance bumps with a circular structure until the impeller is rebalanced dynamically. This dynamic balance trimming of the centrifugal impeller can be applied to automated operation, has higher precision adjustment, and is more convenient for detection and debugging, thereby extending the service life of the product.

[0017] 3. In the structure of the DC fan impeller provided by the present utility model, the DC fan drives the centrifugal impeller to rotate through a driving structure. By providing a coupling hole through the lower bottom plate of the centrifugal impeller, the rotating shaft of the driving structure penetrates into the coupling hole. According to the fact that a limiting plane is provided on the inner wall of the coupling hole, a half shaft portion is provided on the rotating shaft corresponding to fit with the limiting plane. With this structural arrangement, the rotating shaft and the coupling hole form a linkage fit through the cooperation of the half shaft portion and the limiting plane, thereby realizing the effect of transmitting torque between the rotating shaft and the centrifugal impeller. The structure is simple and the cooperative transmission is reliable.

[0018] 4. In the DC fan provided by the present utility model, the fan housing consists of an upper cover, a base, etc. The centrifugal impeller is rotatably arranged in the impeller cavity between the upper cover and the base. There is a premixing joint communicating with the impeller cavity at the top of the upper cover. This premixing joint can be connected to an external gas pipeline. Through the premixing joint, air and gas can be fed into the impeller cavity in a certain proportion. The mixed gas is blown into the combustion chamber by the wind generated by the operation of the centrifugal impeller for full combustion. By setting a sealing ring between the premixing joint and the upper cover, the sealing performance of the connection between the premixing joint and the upper cover can be ensured, preventing leakage accidents and ensuring the safety of product use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art.

[0020] Figure 1 Schematic diagram of the installation structure of the impeller structure of the DC fan provided by the present utility model;

[0021] Figure 2 Schematic diagram of the structure of the centrifugal impeller of the present utility model;

[0022] Figure 3 Schematic diagram of the installation structure of the DC fan provided by the present utility model;

[0023] Figure 4 Schematic cross-sectional structure diagram of the DC fan of the present utility model;

[0024] Figure 5 Schematic diagram of the structure of the upper cover of the present utility model.

[0025] Description of the reference numerals in the drawings: 1. Housing; 11. Base; 12. Upper cover; 13. Rear cover; 14. Installation cavity; 15. Impeller cavity; 16. Blowing channel; 17. Sealing groove; 18. Sealing convex edge; 2. Stator assembly; 21. Stator body; 22. Stator coil; 3. Rotor; 4. Rotating shaft; 43. Locking member; 5. Bearing structure; 6. Positioning ring; 7. Bearing shock absorber sleeve; 8. Centrifugal impeller; 81. Balance panel; 82. Balance convex block; 83. Central hole; 84. Lower bottom plate; 85. Connecting boss; 86. Coupling hole; 87. Limiting plane; 9. Premixing joint; 10. Circuit board. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following will clearly and completely describe the technical solutions of the present utility model in conjunction with the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model.

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0028] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0029] Embodiment 1

[0030] This embodiment provides a Figures 1-5 centrifugal fan impeller structure as described above, including a centrifugal impeller 8 rotatably arranged in the impeller cavity 15 of the fan housing 1. The centrifugal impeller 8 includes a balance panel 81 provided at its top and a central hole 83 opened in the middle of the balance panel 81. The balance panel 81 is provided in a circular ring shape and bulges a certain height. It also includes a plurality of balance bumps 82 formed at intervals along the circumference on the balance panel 81. When the centrifugal impeller 8 is subjected to dynamic balance testing, its dynamic balance is trimmed by cutting or grinding a plurality of balance bumps 82.

[0031] In the above embodiment, according to the centrifugal impeller 8 having a balance panel 81 in the shape of a circular ring at its top, and a plurality of balance cams are arranged at intervals along the circumference on the balance panel 81, and the distribution is reasonable and uniform. During the process of dynamically balancing the centrifugal impeller 8 by a dynamic balance testing device, the dynamic balance of the centrifugal impeller 8 can be trimmed by cutting or grinding a plurality of balance bumps 82. Since the balance weights of the impeller in different orientations will be changed after the balance bumps 82 are cut or ground, the dynamic balance condition of the impeller is effectively improved, thereby realizing the function of adjusting the dynamic balance of the impeller. At the same time, the traditional method of adding counterweights is also avoided. The method of adjusting the dynamic balance of the centrifugal impeller 8 adopting this technical solution is relatively simple, has good controllability, higher precision adjustment, is convenient for detection and debugging, thereby overcoming the vibration problem caused by the imbalance of the centrifugal impeller 8, making the dynamic balance performance of the impeller meet the standard, and thus ensuring the product quality and service performance of the fan.

[0032] As a preferred embodiment, several balance bumps 82 are respectively several circular protrusions integrally formed on the balance panel 81, that is, the balance panel 81 and the several balance bumps 82 are integrally formed by an injection molding process. The integrally formed structure has good stability, enabling the several balance bumps 82 to be pre-uniformly distributed on the balance panel 81 of the centrifugal impeller 8. These balance bumps 82 are designed with a circular structure, which is more regular and balanced, conducive to reducing errors and having less resistance to the operation of the impeller. When the impeller generates poor dynamic imbalance during operation, it is necessary to conduct a dynamic balance test and adjustment on the centrifugal impeller 8. By grinding or trimming the circular balance bumps until the impeller is re-adjusted to the dynamic balance state. The dynamic balance trimming of this impeller can be applied to automated operations, with higher precision adjustment and more convenient detection and debugging, thereby improving the service life of the product.

[0033] The following will combine Figures 1-2 to make a detailed description of the specific structure of the centrifugal impeller:

[0034] The centrifugal impeller 8 includes a lower bottom plate 84 opposite to the central hole 83, and several arc-shaped blades disposed between the lower bottom plate 84 and the balance panel 81. The several arc-shaped blades are arranged in a circular array around the central hole 83. Among them, according to the DC fan including a driving structure for driving the centrifugal impeller 8 to rotate, the centrifugal impeller 8 is driven to rotate by the rotating shaft member of the driving structure, forming a low pressure at the center of the centrifugal impeller 8. The gas medium is then sucked into the impeller structure under the action of the pressure difference. According to the design of multiple arc-shaped impeller blades, the gas medium filled between the impeller blades moves radially from the center of the centrifugal impeller to the periphery under the action of inertial centrifugal force, enabling the gas medium to obtain energy during the movement through the centrifugal impeller 8, increasing the flow velocity, and relying on the continuous operation of the centrifugal impeller to play a role in promoting the movement of the gas medium, so that the gas medium is continuously sucked in and discharged.

[0035] By providing a connecting boss 85 on the lower bottom plate 84, a coupling hole 86 for cooperating with the rotating shaft is provided through the connecting boss 85 and the lower bottom plate 84. A limiting plane 87 extending along its axial direction is provided on the inner wall of the coupling hole 86, and the rotating shaft has a half shaft portion that fits with the limiting plane 87. With this structural arrangement, through the cooperation between the half shaft portion and the limiting plane 87, a linkage cooperation is formed between the rotating shaft and the coupling hole 86, thereby achieving the effect of transmitting torque between the rotating shaft and the centrifugal impeller 8. The structure is simple and the cooperative transmission is reliable.

[0036] Embodiment 2

[0037] This embodiment provides as Figures 1-5The DC fan is used in a gas water heater, and includes a housing 1, a drive structure and the DC fan impeller structure described in Example 1. The fan housing 1 includes a base 11, an upper cover 12 and a rear cover 13. The base 11 and the upper cover 12 cooperate to form an impeller chamber 15 and a blowing channel 16 connected to the impeller chamber 15. The base 11 and the rear cover 13 cooperate to form an installation chamber 14 for installing the drive structure. The drive structure is preferably a drive motor, which drives the centrifugal impeller 8 to rotate in the impeller chamber 15, and forms a low pressure at the center of the centrifugal impeller 8. The gas medium is then sucked into the impeller structure under the action of the pressure difference, so that the gas medium is subjected to the inertial centrifugal force between the blades to obtain mechanical energy, and relies on the continuous operation of the centrifugal impeller 8 to promote the movement of the gas medium, so that the gas medium is continuously sucked in and discharged, and the gas medium is sent into the combustion chamber of the gas water heater through the blowing channel 16. The DC fan appliance adopting this structural design is provided with the DC fan impeller structure as described above, and thus naturally has all the advantages brought about by the provision of the above-mentioned DC fan impeller structure.

[0038] As a preferred embodiment, a premixing joint 9 is provided on the top of the upper cover 12, and the premixing joint 9 is arranged opposite to the center hole 83 of the centrifugal impeller 8 in an upper and lower direction. This design makes the premixing chamber of the premixing joint 9 communicate with the center hole 83. This premixing joint 9 can be connected to an external gas pipeline. Air-gas can be introduced into the centrifugal impeller 8 in a certain proportion through the premixing joint 9, and the mixed gas is sent into the combustion chamber for full combustion by relying on the inertial centrifugal force generated by the continuous operation of the centrifugal impeller 8. By arranging a sealing ring between the premixing joint 9 and the upper cover 12, the sealing of the connection between the premixing joint 9 and the upper cover 12 can be ensured to prevent leakage accidents and ensure the safety of product use.

[0039] In order to ensure the sealing of the connection between the upper cover 12 and the base 11, Figure 1 and Figure 5 As shown, a sealing groove 17 is provided on the bottom edge of the contour where the upper cover 12 is connected to the base 11, and a layer of sealant is poured in the sealing groove 17. The top surface of the base 11 is provided with a sealing convex edge 18 that is matched and inserted into the sealing groove. The sealing convex edge 18 and the sealing groove 17 can be kept sealed by the sealant. Since the bottom edge of the contour and the sealing convex edge 18 are irregular, the use of sealant is more suitable for the sealed connection and cooperation between the upper cover 12 and the base 11, and also plays a sealing and fixing role to prevent gas leakage accidents between the upper cover 12 and the base 11, and is safe and reliable to use.

[0040] like Figure 4As shown, the driving structure includes a stator assembly 2, a rotor 3 and a rotating shaft 4, the rotating shaft is linked to the rotor 3, a circuit board 10 is arranged at the lower end of the stator assembly 2, and the circuit board is electrically connected to the driving structure, the stator assembly 2 includes a central cavity suitable for accommodating the rotor 3, and two positioning rings 6 relatively fixed at both ends of the central cavity, and two bearing structures 5 concentrically arranged on the two positioning rings 6 and matched with the rotating shaft, specifically, two relative positioning grooves are arranged on the two positioning rings 6, and the two bearing structures 5 are installed in the two positioning grooves to maintain axial alignment. The rotating shaft 4 is aligned so that the rotating shaft 4 is connected to the two bearing structures 5 respectively after passing through the two positioning rings 6, and the bearing shock-absorbing sleeve 7 is arranged between the positioning groove and the bearing structure 5, and the bearing shock-absorbing sleeve 7 plays a role of shock absorption and buffering between the positioning ring 6 and the bearing structure 5, and the rotating shaft penetrates into the impeller cavity 15 and cooperates with the coupling hole 86 of the centrifugal impeller 8 to transmit torque, specifically, one end of the rotating shaft passes through the coupling hole 86 and is locked with a locking member 43, and the locking member 43 can be preferably a locking nut or a nut, so that the linkage between the centrifugal impeller 8 and the rotating shaft 4 is realized. The advantage of adopting the above structural design is that according to the two bearing structures 5 and the two positioning rings 6 being concentrically arranged at the two ends of the stator assembly 2, the coaxiality of the two bearings can be ensured, so that the verticality of the connection between the rotating shaft 4 and the two bearing structures 5 can be ensured, the installation is convenient and quick, the installation efficiency is improved, the reliability and stability of the operation of the rotor and the rotating shaft are ensured, and the service life and performance of the product are improved.

[0041] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A DC fan impeller structure, including a centrifugal impeller (8) rotatably arranged in an impeller cavity (15) of a fan housing (1), characterized in that: The centrifugal impeller (8) comprises a balancing panel (81) arranged on the top thereof and a central hole (83) opened in the middle of the balancing panel (81); the balancing panel (81) is arranged in a circular ring shape with a certain height raised, and further comprises a plurality of balancing protrusions (82) formed on the balancing panel (81) at intervals along the circumferential direction; during a dynamic balancing test, the centrifugal impeller (8) is trimmed for its own dynamic balance by cutting or grinding a plurality of balancing protrusions (82).

2. The structure of the DC fan impeller according to claim 1, wherein: The plurality of balancing protrusions (82) are respectively a plurality of circular protrusions integrally formed on the balancing panel (81).

3. The DC fan impeller structure according to claim 1 or 2, characterized in that: The centrifugal impeller (8) comprises a lower bottom plate (84) opposite to the central hole (83), and a plurality of arc-shaped blades arranged between the lower bottom plate (84) and the balancing panel (81), wherein the plurality of arc-shaped blades are arranged in a circular array around the central hole (83).

4. The DC fan impeller structure according to claim 3, characterized in that: The centrifugal impeller (8) is driven by a rotating shaft of a driving structure. The lower base plate (84) is provided with a connecting boss (85). A coupling hole (86) cooperating with the rotating shaft is provided between the connecting boss (85) and the lower base plate (84).

5. The DC fan impeller structure according to claim 4, characterized in that: The inner wall of the coupling hole (86) is provided with a limiting plane (87) extending along its axial direction, and the rotating shaft has a semi-axial portion that fits with the limiting plane (87).

6. A DC fan, which is used in a gas water heater, is characterized in that: It comprises a housing (1), a driving structure and a DC fan impeller structure as claimed in any one of claims 1 to 5.

7. The DC fan according to claim 6, wherein: The fan housing (1) comprises a base (11), an upper cover (12) and a rear cover (13); the base (11) and the upper cover (12) cooperate to form an impeller chamber (15) and an air blowing channel (16) connected to the impeller chamber (15).

8. The DC fan according to claim 7, wherein: A premixing joint (9) is provided on the top of the upper cover (12); the premixing joint (9) and the central hole (83) of the centrifugal impeller (8) are arranged opposite to each other in the upper and lower directions; and a sealing ring is provided between the premixing joint (9) and the upper cover (12).

9. The DC fan according to claim 7, wherein: The base (11) and the rear cover (13) cooperate to form an installation cavity (14) for installing a driving structure. The driving structure comprises a stator assembly (2), a rotor (3) and a rotating shaft (4). The rotating shaft (4) is arranged on the rotor (3) in a linkage manner. The stator assembly (2) comprises a central cavity suitable for accommodating the rotor (3), two positioning rings (6) relatively fixed at two ends of the central cavity, and two bearing structures (5) coaxially arranged on the two positioning rings (6) and cooperating with the rotating shaft. The rotating shaft is arranged on the rotor (3) in a linkage manner. The rotating shaft penetrates into the impeller cavity (15) and cooperates with the coupling hole (86) of the centrifugal impeller (8) to transmit torque. One end of the rotating shaft passes through the coupling hole (86) and is locked by a locking member (43).

10. The DC fan according to claim 8, wherein: A sealing groove (17) is provided on the bottom edge of the contour where the upper cover (12) is connected to the base (11), a layer of sealant is poured into the sealing groove (17), and a sealing convex edge (18) is provided on the top surface of the base (11) to match and be inserted into the sealing groove.

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