Direct-current fan structure

Abstract

The utility model discloses a direct current fan structure which comprises a driving structure arranged on a shell, the driving structure comprises a stator assembly, a rotor and a driving shaft arranged on the rotor in a linkage mode, and the stator assembly comprises two positioning rings relatively fixed to the two ends of a middle cavity and two positioning grooves formed in the two positioning rings respectively. Two bearing structures which are axially aligned are installed in the two positioning grooves, the driving shaft penetrates through the two positioning rings and then is connected to the two bearing structures, and a limiting structure is arranged between the driving shaft and the two bearing structures, so that by means of the installation design, the perpendicularity of connection between the driving shaft and the two bearing structures can be guaranteed, and installation errors are reduced; the connecting length of the driving shaft between the two bearings is shortened, installation is convenient and fast, installation efficiency is improved, reliability and stability of operation of the rotor and the driving shaft are guaranteed, the service life of a product is prolonged, and performance of the product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, and particularly to a DC fan structure. Background Art

[0002] A fan is usually configured in a gas water heater. Since the gas water heater has relatively high requirements for the air-gas ratio during operation, the fan can blow air and gas into the combustion chamber in a certain proportion for full combustion, and can also discharge the waste gas and waste heat generated during the use of the water heater. With the continuous development of electronic and electrical equipment technology, the fan industry is gradually developing towards performance optimization and high reliability.

[0003] Common existing DC fans include a housing base, a housing cover, a stator assembly, a rotor, and an impeller assembly. The housing base and the housing cover are cooperatively installed to form an installation cavity for accommodating the stator assembly and the rotor. Two bearings are provided at both ends of the rotor shaft of the rotor, and two installation grooves for installing the bearings are correspondingly provided on the housing base and the housing cover. With the help of tools, the two bearings are hard-pressed and clamped into the two installation grooves. However, in actual use, due to the manufacturing, processing, and installation errors of the housing base and the housing cover, the two installation grooves have deviations in the vertical direction. This way of pressing and installing the bearings will cause misalignment at both ends of the rotor shaft in the axial direction, resulting in insufficient perpendicularity, increasing friction and generating noise. Long-term use will cause damage and deformation of the rotor shaft, shortening the service life of the product, and the entire rotor shaft is made relatively long, increasing the volume of the product. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the problem that in the prior art, two bearings are pressed and clamped into two installation grooves provided on the housing base and the housing cover, resulting in insufficient perpendicularity of both ends of the rotor shaft installed on the two bearings, and long-term use will cause damage and deformation of the rotor shaft, shortening the service life of the product.

[0005] To solve the above technical problem, the utility model provides a DC fan structure, which includes a housing with an installation cavity and a driving structure arranged in the installation cavity. The driving structure includes a stator assembly, a rotor, and a driving shaft. The driving 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. Two positioning grooves are concentrically provided on the two positioning rings, and two bearing structures axially aligned are installed in the two positioning grooves. The driving shaft passes through the two positioning rings and is connected to the two bearing structures. A limiting structure for limiting the bearing structures in the positioning grooves is provided between the driving shaft and the two bearing structures.

[0006] In the above DC fan structure, a bearing shock-absorbing sleeve is provided between the positioning groove and the bearing structure.

[0007] In the above DC fan structure, the two positioning rings and the two bearing shock-absorbing sleeves are respectively provided with through holes for the driving shaft to pass through, and the bearing shock-absorbing sleeve surrounds the outside of the bearing structure.

[0008] In the above DC fan structure, the limiting structure includes two limiting fasteners arranged on the driving shaft. The two limiting fasteners are respectively and cooperatively limited at the opposite ends of the two bearing structures, and the opposite ends of the two bearing structures are respectively limited by the two positioning grooves.

[0009] In the above DC fan structure, the limiting structure further includes two limiting platforms formed on the driving shaft and opposite to the two limiting fasteners respectively. The limiting platforms and the limiting fasteners are respectively limited at both ends of the bearing structure.

[0010] In the above DC fan structure, the stator assembly includes a stator body surrounding the rotor and a stator coil arranged on the stator body. A ring-shaped positioning step is provided on the side wall of the positioning ring. Positioning bosses (23) cooperating with the positioning step are respectively provided on the inner walls at both ends of the stator body, and a plurality of limiting grooves are respectively provided at both ends of the stator body. Corresponding to this, a plurality of limiting blocks inserted into the plurality of limiting grooves are provided on the positioning ring (6).

[0011] In the above DC fan structure, the housing includes a base, an upper cover and a rear cover. The base and the rear cover cooperate to form an installation cavity suitable for accommodating the driving structure, and a circuit board connected below the stator assembly is further provided in the installation cavity.

[0012] In the above DC fan structure, the base and the upper cover cooperate to form an impeller cavity. A centrifugal impeller is rotatably arranged in the impeller cavity, and the driving structure is connected to the centrifugal impeller by the driving shaft passing through the impeller cavity.

[0013] In the above DC fan structure, a coupling hole cooperating with the driving shaft is provided on the centrifugal impeller, and one end of the driving shaft passes through the coupling hole and is locked by a locking member.

[0014] In the above DC fan structure, a premixing joint communicating with the impeller cavity is provided at the top of the upper cover, and a blowing channel communicating with the impeller is provided between the upper cover and the base.

[0015] The technical solution of the present utility model has the following advantages compared with the prior art:

[0016] 1. In the DC fan structure provided by the utility model, the rotor and the driving shaft are linked to be arranged in the middle cavity of the stator assembly, and two relative positioning rings are arranged at the two ends of the middle cavity, and the two bearing structures are installed to the positioning operation of the two positioning rings. The two relative positioning rings and the two positioning grooves play a concentric positioning and installation role on the bearing structure to ensure the coaxiality of the two bearing installations, so that the driving shaft passes through the two positioning rings and is respectively connected to the two bearing structures, and the bearing structure is limited in the positioning groove by the limiting structure. Such an installation design can ensure the verticality of the connection between the driving shaft and the two bearing structures, reduce installation errors, and the two bearing structures and the two positioning rings are respectively concentrically arranged at the two ends of the stator assembly, which is conducive to shortening the connection length between the driving shaft and the two bearings, thereby helping to reduce the product volume, and the installation is convenient and quick, and the installation efficiency is improved, the reliability and stability of the operation of the rotating shaft and the driving shaft are guaranteed, and the service life and performance of the product are improved.

[0017] 2. In the DC fan structure provided by the utility model, a bearing shock-absorbing sleeve is arranged between the positioning groove and the bearing structure, and the bearing shock-absorbing sleeve surrounds the outer side of the bearing structure. The bearing shock-absorbing sleeve is made of rubber material and has elastic deformation ability. It can not only play a shock-absorbing and buffering role between the positioning ring and the bearing structure, but also can adaptively adjust the position coordination between the positioning ring and the bearing structure through elastic deformation when the installation is under pressure, so as to ensure the verticality of the drive shaft installed between the two bearing structures.

[0018] 3. In the DC fan structure provided by the utility model, a limit clamp and a limit clamp table are provided on the driving shaft to limit the two ends of the bearing structure. During installation, the driving shaft is passed through two positioning rings, and the bearing structure is installed in the positioning groove and correspondingly sleeved on the driving shaft, so that one end of the bearing structure is limited by the limit clamp table, and then the limit clamp is installed on the driving shaft and limited to the other end of the bearing structure. The bearing structure is limited by the relative limiting cooperation of the limit clamp and the limit clamp table to prevent the bearing structure from being separated from the installation groove of the positioning ring after being connected to the driving shaft. This simplifies the installation structure, makes installation convenient and quick, and improves installation efficiency.

[0019] 4. In the DC fan structure provided by the present utility model, an annular positioning step is provided on the side wall of the positioning ring, and corresponding positioning bosses that form a positioning fit with the positioning step are provided on the inner walls at both ends of the stator body. At the same time, a plurality of limiting blocks inserted into a plurality of limiting grooves are also provided on the positioning ring. With this structural arrangement, the two positioning rings are positioned and installed at both ends of the stator body through the cooperation of the positioning step and the positioning boss, and the positioning ring is prevented from rotating through the cooperation of the limiting block and the limiting groove. The installation structure of this positioning ring is simple, the positioning is more accurate, which is conducive to improving the installation efficiency, thereby ensuring the consistency and coaxiality of the installation of the two positioning rings, and further ensuring the accuracy and stability of the installation positions of the two bearings and the drive shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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 the description of the specific embodiments or the prior art.

[0021] Figure 1 Schematic perspective view of the DC fan structure provided by the present utility model;

[0022] Figure 2 Schematic cross-sectional view of the DC fan structure of the present utility model;

[0023] Figure 3 Schematic cross-sectional view of the drive structure of the present utility model;

[0024] Figure 4 Schematic perspective view of the drive structure of the present utility model;

[0025] Figure 5 Schematic perspective view of the positioning ring of the present utility model.

[0026] Description of the reference numerals: 1, housing; 11, base; 12, upper cover; 13, rear cover; 14, installation cavity; 15, impeller cavity; 16, blowing channel; 2, stator assembly; 21, stator body; 22, stator coil; 23, positioning boss; 3, rotor; 4, drive shaft; 41, limiting clamping member; 42, limiting clamping platform; 43, locking member; 5, bearing structure; 6, positioning ring; 61, positioning groove; 62, limiting block; 63, positioning step; 7, bearing shock absorber sleeve; 8, centrifugal impeller; 9, premixing joint; 10, circuit board. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] 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 part of the embodiments of the present utility model, rather than all of the embodiments.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example

[0031] This embodiment provides Figures 1 - 5 The DC fan structure described herein comprises a shell 1 having an installation cavity 14 and a driving structure arranged in the installation cavity 14, wherein the driving structure comprises a stator assembly 2, a rotor 3 and a driving shaft 4, wherein the driving shaft 4 is linkedly arranged on the rotor 3, wherein the stator assembly 2 comprises a central cavity suitable for accommodating the rotor 3, and two positioning rings 6 relatively fixed at two ends of the central cavity, wherein the two positioning rings 6 are concentrically provided with two positioning grooves, wherein two axially aligned bearing structures 5 are installed in the two positioning grooves, wherein the driving shaft 4 is connected to the two bearing structures 5 after passing through the two positioning rings 6, and a limiting structure for limiting the bearing structure 5 in the positioning groove is provided between the driving shaft 4 and the two bearing structures 5.

[0032] The above-described embodiment is the core technical solution of this example. Since the rotor 3 together with the drive shaft 4 is disposed in the central cavity of the stator assembly 2, the drive shaft 4 is the rotor shaft of the rotor 3. By providing two opposite positioning rings 6 at both ends of the central cavity and mounting the two bearing structures 5 to the two positioning rings 6, the two bearing structures 5 are concentrically positioned and mounted by the two opposite positioning rings 6 and the two positioning grooves, so as to ensure the coaxiality of the two bearings. Thus, the drive shaft 4 passes through the two positioning rings 6 and is respectively connected to the two bearing structures 5, and the bearing structures 5 are limited in the positioning grooves by the limiting structure. Such an installation design can ensure the perpendicularity of the connection between the drive shaft 4 and the two bearing structures 5, reduce the installation error. Since the two bearing structures 5 and the two positioning rings 6 are respectively concentrically arranged at both ends of the stator assembly, it is beneficial to shorten the connection length between the drive shaft and the bearings, thereby facilitating the reduction of the product volume, making the installation convenient and fast, improving the installation efficiency, ensuring the reliability and stability of the operation of the rotor 3 and the drive shaft 4, and enhancing the service life and performance of the product.

[0033] To reduce the vibration influence between the positioning ring 6 and the bearing structure 5, as Figures 2 - 3 shown, a bearing shock-absorbing sleeve 7 is provided between the positioning groove and the bearing structure 5. The bearing shock-absorbing sleeve 7 is preferably made of rubber material and has a bearing groove matching the bearing structure 5. Among them, the two positioning rings 6 and the two bearing shock-absorbing sleeves 7 are respectively provided with through holes through which the drive shaft 4 can pass, and the bearing shock-absorbing sleeve 7 surrounds the outside of the bearing structure 5. The advantage of such a design is that since the bearing shock-absorbing sleeve 7 made of rubber material has a certain elastic deformation ability, it can not only play a shock-absorbing and buffering role between the positioning ring 6 and the bearing structure 5, but also adaptively adjust the position fit between the positioning ring 6 and the bearing structure 5 through elastic deformation when being pressed during installation, so as to ensure the perpendicularity of the drive shaft 4 installed between the two bearing structures 5.

[0034] The following Figures 2 - 4 will describe in detail the specific setting method of the limiting structure:

[0035] The limiting structure includes two limiting members 41 provided on the driving shaft 4. The two limiting members 41 are respectively cooperatively limited at the opposite ends of the two bearing structures 5. The opposite ends of the two bearing structures 5 are respectively limited in two positioning grooves. The two bearing structures 5 are prevented from axially moving along the driving shaft 4 through the two limiting members 41, so as to respectively limit and hold the two bearing structures 5 in the two positioning grooves. Further preferably, the limiting structure further includes two limiting platforms 42 formed on the driving shaft 4 and opposite to the two limiting members 41 respectively. The limiting platforms 42 and the limiting members 41 are respectively limited at both ends of the bearing structure 5. With this structural arrangement, during installation, since the driving shaft 4 passes through the two positioning rings 6, when the bearing structure 5 is installed into the positioning groove, it will be correspondingly sleeved on the driving shaft 4, so that one end of the bearing structure 5 is limited by the limiting platform 42, and then the limiting member 41 is installed on the driving shaft 4 and restricted at the other end of the bearing structure 5. The limiting cooperation between the limiting member 41 and the limiting platform 42 plays a limiting role on the bearing structure 5 to prevent the bearing structure 5 from disengaging from the installation groove of the positioning ring 6 after being connected to the driving shaft 4. This simplifies the installation structure, makes the installation convenient and fast, and improves the installation efficiency.

[0036] Further preferably, as Figures 4 - 5 shown, the stator assembly 2 includes a stator body 21 surrounding the rotor 3 and a stator coil 22 provided on the stator body 21. An annular positioning step 63 is provided on the side wall of the positioning ring 6. Positioning bosses 23 adapted to the positioning steps are respectively provided on the inner walls at both ends of the stator body 21, and a plurality of limiting grooves are respectively provided at both ends of the stator body 21. Corresponding to this, a plurality of limiting blocks 62 inserted into the plurality of limiting grooves are provided on the positioning ring 6. With this structural arrangement, the two positioning rings 6 are positioned and installed at both ends of the stator body through the cooperation of the positioning step and the positioning boss, and the positioning ring 6 is prevented from rotating through the cooperation of the limiting block and the limiting groove. The installation structure of this positioning ring 6 is simple, the positioning is more accurate, which is beneficial to improving the installation efficiency, so as to ensure the consistency and coaxiality of the installation of the two positioning rings 6, and further ensure the accuracy and stability of the installation positions of the two bearings and the driving shaft 4.

[0037] In this embodiment, as shown in combination with Figures 1 - 3 shown, the housing 1 includes a base 11, an upper cover 12 and a rear cover 13. The base 11 and the rear cover 13 cooperate to form an installation cavity 14 suitable for accommodating the driving structure. A circuit board 10 connected below the stator assembly 2 is further provided in the installation cavity 14. The relative position between the circuit board 10 and the stator assembly 2 is fixed by a hook structure. The driving structure is a driving motor composed of the stator assembly 2 and the rotor 3 assembly. The circuit board 10 is used to control the operation of the driving structure.

[0038] Further preferably, the base 11 and the upper cover 12 cooperate to form an impeller chamber 15. An impeller 8 is rotatably arranged in the impeller chamber 15. The driving structure is connected to the impeller 8 through a driving shaft 4 penetrating into the impeller chamber 15. Among them, a coupling hole cooperating with the driving shaft 4 is arranged at the bottom of the impeller 8. One end of the driving shaft 4 passes through the coupling hole and is locked by a locking member 43. The locking member 43 is preferably a locking nut or a nut. Such a setting realizes the linkage cooperation between the impeller 8 and the driving shaft 4.

[0039] As Figure 1 shown, a premixing joint 9 communicating with the impeller chamber 15 is arranged at the top of the upper cover 12. An air outlet is arranged between the upper cover 12 and the base 11. A central hole opposite to the premixing joint 9 up and down is arranged at the top of the impeller 8. Such a design makes the premixing chamber of the premixing joint 9 communicate with the central hole. The DC fan in this embodiment is used for a gas water heater. This premixing joint 9 can be connected to a gas pipeline. Through the premixing joint 9, air-gas can enter the impeller 8 in a certain proportion. Relying on the inertial centrifugal force generated by the continuous operation of the impeller 8, the mixed gas is blown into the combustion chamber for full combustion. By arranging a sealing ring between the premixing joint 9 and the upper cover 12, the sealing performance 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.

[0040] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A DC fan structure, comprising a housing (1) and a drive structure disposed in an installation cavity (14) of the housing (1), the drive structure including a stator assembly (2), a rotor (3) and a drive shaft (4), the drive shaft (4) being linked to the rotor (3), characterized in that: The stator assembly (2) includes a central cavity adapted to accommodate the rotor (3), and two positioning rings (6) relatively fixed at both ends of the central cavity. Two positioning grooves are concentrically provided in the two positioning rings (6), and two axially aligned bearing structures (5) are installed in the two positioning grooves. The drive shaft (4) passes through the two positioning rings (6) and is connected to the two bearing structures (5). A limiting structure is provided between the drive shaft (4) and the two bearing structures (5) to limit the bearing structure (5) in the positioning groove.

2. The structure of a DC fan according to claim 1, characterized in that: A bearing shock-absorbing sleeve (7) is provided between the positioning groove and the bearing structure (5).

3. The structure of a DC fan according to claim 2, characterized in that: The two positioning rings (6) and the two bearing shock-absorbing sleeves (7) are respectively provided with through holes for the drive shaft (4) to pass through, and the bearing shock-absorbing sleeve (7) surrounds the outside of the bearing structure (5).

4. A DC fan structure according to claim 1, characterized in that: The limiting structure includes two limiting members (41) provided on the drive shaft (4). The two limiting members (41) are respectively cooperatively limited at the opposite ends of the two bearing structures (5), and the opposite ends of the two bearing structures (5) are respectively limited by the two positioning grooves.

5. A DC fan structure according to claim 4, characterized in that: The limiting structure further includes two limiting platforms (42) formed on the drive shaft (4) and opposite to the two limiting members (41) respectively. The limiting platform (42) and the limiting member (41) are respectively limited at both ends of the bearing structure (5).

6. A DC fan structure according to claim 1, characterized in that: The stator assembly (2) includes a stator body (21) disposed around the rotor (3) and a stator coil (22) disposed on the stator body (21). An annular positioning step (63) is provided on the side wall of the positioning ring (6). Positioning bosses (23) adapted to the positioning steps are respectively provided on the inner walls at both ends of the stator body (21), and a plurality of limiting grooves are respectively provided at both ends of the stator body (21). A plurality of limiting blocks (62) inserted into the plurality of limiting grooves are correspondingly provided on the positioning ring (6).

7. A DC fan structure according to any one of claims 1-6, characterized in that: The housing (1) includes a base (11), an upper cover (12) and a rear cover (13). The base (11) and the rear cover (13) cooperate to form an installation cavity (14) adapted to accommodate the drive structure. A circuit board (10) connected below the stator assembly (2) is further provided in the installation cavity (14).

8. A DC fan structure according to claim 7, characterized in that: The base (11) and the upper cover (12) cooperate to form an impeller cavity (15). A centrifugal impeller (8) is rotatably disposed in the impeller cavity (15). The drive structure is connected to the centrifugal impeller (8) by the drive shaft (4) passing into the impeller cavity (15).

9. The structure of a DC fan according to claim 8, characterized in that: The centrifugal impeller (8) is provided with a coupling hole adapted to the drive shaft (4). One end of the drive shaft (4) passes through the coupling hole and is locked by a locking member (43).

10. A DC fan structure according to claim 7, characterized in that: A premixing joint (9) communicating with the impeller cavity (15) is provided at the top of the upper cover (12). A blowing channel (16) communicating with the impeller is formed between the upper cover (12) and the base (11).

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