Self-cleaning generator

Abstract

The utility model discloses a self-cleaning generator, which belongs to the technical field of generators and comprises a front end cover, a rear end cover and a cleaning mechanism mounted on the outer side of the rear end cover, a connecting shaft used for transmitting torque is coaxially connected between the cleaning mechanism and a rotor shaft of a rotor, and the rotor shaft is mounted in a rear bearing chamber of the rear end cover through a rear bearing. The rear end cover is provided with a connecting bearing chamber coaxial with the rear bearing chamber, a connecting bearing is pressed in the connecting bearing chamber, the rear end of the connecting shaft penetrates through an inner ring of the connecting bearing, the front end of the connecting shaft is clamped to the axial end face of the front side of the inner ring of the connecting bearing, and the connecting shaft is supported and positioned only through the connecting bearing installed on the rear end cover. Supporting and positioning of the rotor shaft and the connecting shaft used for the split connecting part are both arranged on the rear end cover, the two bearing chambers are sequentially machined, secondary clamping and positioning of a cutter are avoided, the manufacturability is better, the two bearing chambers have high coaxiality, and therefore the coaxiality between the rotor shaft and the connecting shaft and the reliability of split connection are guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of generators, and particularly relates to a self-cleaning generator. Background Art

[0002] Based on the power consumption requirements of electrical appliances, motor vehicles are generally equipped with alternators. Depending on the electromagnetic principle, the mechanical energy of the engine is converted into electrical energy to provide power supply for the electrical appliances and storage batteries of the whole vehicle. The current cooling method of the alternator is air cooling. A centrifugal fan is used. By the high-speed rotation of the fan, a pressure difference is formed to form the air flow of the entire cooling air duct to achieve the cooling of the generator. As the working conditions of the generator become more severe, especially for agricultural machinery, during the harvesting of wheat and corn, the air is filled with debris of wheat and corn. Such debris will be adsorbed to the rear shield of the generator by the pressure difference generated by the centrifugal fan, causing the blockage of the cooling air duct of the generator, the failure of the generator to dissipate heat, and the high-temperature failure of the heating components of the generator.

[0003] In view of the above problems, Patent CN202021307860.7, an air filter structure and a generator of a generator, proposes to set a rotating brush holder outside the shield to clean foreign objects, and the rotor shaft is directly connected to the rotating brush holder. The reliability and sealing performance of the rotor shaft of this structure cannot meet the needs of customers. For this reason, Patents CN202022033171.8 and CN202120888856.2 are set to give a connecting shaft is arranged between the rotating brush holder and the rotor shaft, and the connecting shaft is separately connected to the rotor shaft. The split connection preferably adopts the cooperation mode of internal and external prisms. The connecting shaft is connected to the rotating brush holder to transmit the torsional force of the rotor shaft to the rotating brush holder; at the same time, the connecting shaft is axially and radially positioned by a third bearing fixed on the metal shield. However, the generators of the above structures still have the following problems:

[0004] 1. The connecting shaft is separately connected to the rotor shaft, and the split connection positions of the two rely on the bearing chamber of the rear end cover and the bearing chamber of the shield for positioning, that is, the connecting shaft and the rotor shaft are fixed and positioned by two parts, and the coaxiality is not easy to guarantee, which easily leads to the failure of the split connection;

[0005] 2. Foreign objects are thrown out by gravity and centrifugal force. The shield outside the cleaning mechanism has only a single-side outlet, and fine foreign objects and dust are easily directly sucked into the internal part of the whole machine;

[0006] 3. The connecting shaft adopts the clearance fit of internal and external prisms. The contact area between the two is small, and the impact is large during transmission, which is easily rounded and causes the failure of the cleaning mechanism. Summary of the Utility Model

[0007] The technical problem to be solved by the utility model is to provide a self-cleaning generator, in which the rear end cover can position the connecting shaft and the rotor shaft, ensure the coaxiality between the connecting shaft and the rotor shaft, and improve the reliability of the split connection.

[0008] To solve the above technical problems, the technical solution of the present utility model is as follows:

[0009] A self-cleaning generator, comprising a front end cover, a rear end cover, a stator and a rotor installed between the front end cover and the rear end cover, and a cleaning mechanism installed outside the rear end cover. A connecting shaft for transmitting torque is coaxially connected between the cleaning mechanism and the rotor shaft of the rotor. The rotor shaft is installed in the rear bearing chamber of the rear end cover through a rear bearing. The rear end cover is provided with a connecting bearing chamber coaxial with the rear bearing chamber. A connecting bearing is press-fitted in the connecting bearing chamber. The rear end of the connecting shaft passes through the inner ring of the connecting bearing, and the front end of the connecting shaft is clamped on the front axial end face of the inner ring of the connecting bearing.

[0010] Further, a flange is formed by outward protrusion at the front end of the connecting shaft. The outer diameter of the flange is greater than the inner diameter of the bearing inner ring and less than the inner diameter of the connecting bearing chamber. The rear end face of the flange abuts against the front axial end face of the inner ring of the connecting bearing.

[0011] Further, a plurality of reinforcing ribs are spaced on the outer circumferential surface of the connecting bearing chamber. The reinforcing ribs extend axially and are connected to the rear end cover body.

[0012] Further, the rear end cover further includes a rear end cover body and a slip ring chamber. The rear bearing chamber, the slip ring chamber and the connecting bearing chamber are formed on the inner surface of the rear end cover body in sequence from front to back.

[0013] Further, the rotor shaft and the connecting shaft are connected by a spline-like structure. The rear end of the rotor shaft extends into a shaft hole opened on the connecting shaft. The shaft hole of the connecting shaft and the end surface of the rotor shaft are respectively arc-shaped concave-convex structures that match each other.

[0014] Further, the cleaning mechanism includes an axial flow fan. Brushes are evenly arranged on the blade edges of the axial flow fan close to one side of the upper cover of the rear end cover.

[0015] Further, an axial threaded hole is opened at the rear end of the connecting shaft. The axial flow fan is installed in the threaded hole through a bolt.

[0016] Further, the thread direction of the cooperation between the connecting shaft and the bolt is the same as the rotation direction of the axial flow fan.

[0017] Further, the cleaning mechanism further includes an annular baffle arranged on the periphery of the axial flow fan. The baffle is fixed to the upper cover.

[0018] Further, a plurality of air discharge openings are spaced on the baffle.

[0019] After adopting the above technical solution, the beneficial effects of the present utility model are as follows:

[0020] Since the self-cleaning generator of the present utility model includes a front end cover, a rear end cover, a stator and a rotor installed between the front end cover and the rear end cover, and a cleaning mechanism installed outside the rear end cover, a connecting shaft for transmitting torque is coaxially connected between the cleaning mechanism and the rotor shaft of the rotor. The rotor shaft is installed in the rear bearing chamber of the rear end cover through a rear bearing. The rear end cover is provided with a connecting bearing chamber coaxial with the rear bearing chamber. A connecting bearing is press-fitted in the connecting bearing chamber. The rear end of the connecting shaft passes through the inner ring of the connecting bearing, and the front end of the connecting shaft is clamped on the front axial end face of the inner ring of the connecting bearing. The connecting shaft is only supported and positioned by the connecting bearing installed on the rear end cover. The support and positioning of the rotor shaft and the connecting shaft for the split connection part are both set on the rear end cover, and the two bearing chambers are processed in sequence, avoiding secondary clamping and positioning of the tool, with better processability, enabling the two bearing chambers to have a higher coaxiality, thereby ensuring the coaxiality between the rotor shaft and the connecting shaft, and further improving the reliability of the split connection between the rotor shaft and the connecting shaft, providing the possibility of transmitting a greater torque to the connecting shaft. Description of the Drawings

[0021] Figure 1 is a schematic cross-sectional structure diagram of the self-cleaning generator of the present utility model;

[0022] Figure 2 is a schematic cross-sectional structure diagram of the rear end cover;

[0023] Figure 3 is a schematic cross-sectional structure diagram of the connection between the rotor shaft and the connecting shaft;

[0024] Figure 4 is a schematic external structure diagram of the self-cleaning generator;

[0025] In the figure, 1 - pulley, 2 - centrifugal fan, 3 - front end cover, 4 - stator, 5 - rotor, 51 - rotor shaft, 52 - rear bearing, 6 - rear end cover, 61 - rear bearing chamber, 62 - slip ring chamber, 63 - connecting bearing chamber, 64 - reinforcing rib, 65 - rear end cover body, 7 - rectifier bridge, 8 - regulator, 9 - shield, 10 - connecting shaft, 101 - flange, 102 - connecting bearing, 11 - axial flow fan, 111 - brush, 112 - bolt, 12 - baffle, 121 - discharge air port. Detailed Embodiments

[0026] The following further describes the present utility model in conjunction with the drawings and embodiments. The preferred embodiments of the present utility model are shown in the drawings. The role of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it cannot be understood as a limitation on the protection scope of the present utility model.

[0027] In the description of this specification, it should be understood that when it comes to orientation description, the front side refers to the side where the pulley 1 is set on the generator, and the rear side refers to the side where the cleaning mechanism is set on the generator. Figure 1 The right side in Figure 1 is the front side, and the left side is the rear side.

[0028] As Figure 1 shown, a self-cleaning generator includes a front end cover 3, a rear end cover 6, a stator 4 and a rotor 5 installed between the front end cover 3 and the rear end cover 6, and a cleaning mechanism installed outside the rear end cover 6. One end of the rotor shaft 51 of the rotor 5 extending out of the front end cover 3 is installed with a pulley 1 and a centrifugal fan 2. A rectifier bridge 7, a regulator 8 and a shield 9 are also installed on the rear end cover 6. A connecting shaft 10 for transmitting torque is coaxially connected between the cleaning mechanism and the rotor shaft 51 of the rotor 5. The rotor shaft 51 is installed in the rear bearing chamber 61 of the rear end cover 6 through a rear bearing 52.

[0029] As Figure 1 and Figure 2 jointly shown, to solve the problem that the coaxiality is not easy to ensure when the connecting shaft 10 and the rotor shaft 51 are separately connected, a connecting bearing chamber 63 coaxial with the rear bearing chamber 61 is provided on the rear end cover 6. A connecting bearing 102 is press-fitted in the connecting bearing chamber 63, and the connecting shaft 10 is installed in the connecting bearing 102. The connecting shaft 10 is positioned and supported by the connecting bearing 102 provided on the connecting bearing chamber 63 of the rear end cover 6, and the rotor shaft 51 is positioned and supported by the rear bearing 52 provided on the rear bearing chamber 61 of the rear end cover 6. The support and positioning of the rotor shaft 51 and the connecting shaft 10 for the separately connected part are both set on the rear end cover 6, and the two bearing chambers can be processed synchronously, which can ensure a high coaxiality, thereby ensuring the coaxiality between the rotor shaft 51 and the connecting shaft 10, and further improving the reliability of the separate connection between the rotor shaft 51 and the connecting shaft 10, providing the possibility of transmitting a greater torque to the connecting shaft 10.

[0030] Specifically, the rear end of the connecting shaft 10 passes through the inner ring of the connecting bearing 102 and the front end of the connecting shaft 10 is clamped on the front axial end face of the inner ring of the connecting bearing 102. The front end of the connecting shaft 10 extends out of the shield 9 and is fixed to the cleaning mechanism. Therefore, only through the connecting bearing 102 can an effective positioning be provided for the connecting shaft 10. The specific structure for clamping at the front end of the connecting shaft 10 is that the front end of the connecting shaft 10 bulges outwards to form a flange 101. The outer diameter of the flange 101 is greater than the inner diameter of the bearing inner ring and less than the inner diameter of the connecting bearing chamber 63. The rear side end face of the flange 101 abuts against the front axial end face of the inner ring of the connecting bearing 102.

[0031] As Figure 2As shown, multiple reinforcing ribs 64 are arranged at intervals on the outer circumferential surface of the connecting bearing chamber 63. The reinforcing ribs 64 extend axially and are connected to the rear end cover body 65, which can ensure the strength of the connecting bearing chamber 63. The rear end cover 6 is composed of a rear end cover body 65, a slip ring chamber 62, a rear bearing chamber 61, and a connecting bearing chamber 63. The rear bearing chamber 61, the slip ring chamber 62, and the connecting bearing chamber 63 are formed on the inner surface of the rear end cover body 65 in sequence from front to back.

[0032] As Figure 3 shown, the rotor shaft 51 and the connecting shaft 10 are connected through a spline-like structure. The rear end of the rotor shaft 51 extends into the shaft hole opened on the connecting shaft 10. The shaft hole of the connecting shaft 10 and the end surface of the rotor shaft 51 are respectively arc-shaped concave and convex structures that match each other. The connecting shaft 10 rotates synchronously with the rotor shaft 51 to achieve torque transmission. On the one hand, there is a large contact area between the rotor shaft 51 and the connecting shaft 10. Therefore, when the generator is working, the impact force received is small and the impact material removal is less. On the other hand, the connection structure between the rotor shaft 51 and the connecting shaft 10 needs to grind away more materials to become round, thereby ensuring the reliability of the split connection.

[0033] As Figure 1 and Figure 4 collectively shown, the cleaning mechanism includes an axial flow fan 11. Brush bristles 111 are evenly arranged on the blade edges of the axial flow fan 11 near the side of the shroud 9 on the rear end cover 6. The brush bristles 111 can clean the foreign objects on the shroud 9. The axial flow fan 11 rotates to generate wind. This wind is divided into radial movement and axial movement, and the radial movement speed is greater than the axial movement speed. The radially moving wind can blow the foreign objects to the outside of the annular baffle 12. Another part of the axial movement enters the interior of the whole machine through the shroud 9 and dissipates heat from the whole machine together with the wind generated by the rotation of the centrifugal fan 2, increasing the heat dissipation efficiency.

[0034] The rear end of the connecting shaft 10 is provided with an axial threaded hole. The axial flow fan 11 is installed in the threaded hole through a bolt 112. The axial flow fan 11 rotates synchronously with the connecting shaft 10 to achieve torque transmission. Among them, the matching thread direction of the connecting shaft 10 and the bolt 112 is the same as the rotation direction of the axial flow fan 11.

[0035] Furthermore, the cleaning mechanism further includes an annular baffle 12 arranged on the periphery of the axial flow fan 11. The baffle 12 is fixed to the shroud 9. On the one hand, it prevents the axial flow fan 11 from falling off and hurting people. On the other hand, it guides the wind formed by the rotation of the axial flow fan 11. The baffle 12 is provided with a plurality of air discharge openings 121 at intervals, which facilitates the radially blown wind to carry away foreign objects.

[0036] Verified by fluid simulation experiments, when an axial flow fan 11 that rotates synchronously with the rotor shaft 51 is arranged at the rear end of the shroud 9, foreign objects can be blown to the outside of the baffle 12. The air volume of the generator of this application entering the interior of the whole machine for heat dissipation increases by about 10% compared with that of a conventional motor, and the heat dissipation efficiency of the whole machine is slightly improved.

[0037] The self-cleaning generator of the present utility model is provided with a connecting bearing chamber coaxial with the rear bearing chamber on the rear end cover. The rear end of the connecting shaft passes through the inner ring of the connecting bearing, and the front end of the connecting shaft is clamped on the front axial end face of the inner ring of the connecting bearing. The support and positioning of the rotor shaft and the connecting shaft for the split connection part are both arranged on the rear end cover, and the two bearing chambers are machined in sequence, avoiding secondary clamping and positioning of the tool, with better processability and coaxiality, thereby ensuring the coaxiality between the rotor shaft and the connecting shaft and improving the reliability of the split connection between the rotor shaft and the connecting shaft.

[0038] In the description of this specification, the meaning of "a plurality" is at least two, such as two, three, etc. Unless otherwise clearly defined, words such as "arranged", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0039] Although the specific embodiments of the present utility model have been described above, those skilled in the art should understand that the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. These are only illustrative examples, and the protection scope of the present utility model is defined by the claims. Without departing from the principles and essence of the present utility model and without any creative work, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present utility model.

Claims

1. A self-cleaning generator, comprising a front cover (3), a rear cover (6), a stator (4) and a rotor (5) installed between the front cover (3) and the rear cover (6), and a cleaning mechanism installed on the outside of the rear cover (6), a connecting shaft (10) for transmitting torque being coaxially connected between the cleaning mechanism and a rotor shaft (51) of the rotor (5), the rotor shaft (51) being installed in a rear bearing chamber (61) of the rear cover (6) via a rear bearing (52), It is characterized in that The rear end cover (6) is provided with a connecting bearing chamber (63) coaxial with the rear bearing chamber (61), a connecting bearing (102) is pressurized in the connecting bearing chamber (63), the rear end of the connecting shaft (10) passes through the inner ring of the connecting bearing (102) and the front end of the connecting shaft (10) is clamped on the front axial end face of the inner ring of the connecting bearing (102).

2. The self-cleaning generator according to claim 1, characterized in that: The front end of the connecting shaft (10) protrudes outward to form a flange (101), the outer diameter of the flange (101) is larger than the inner diameter of the bearing inner ring and smaller than the inner diameter of the connecting bearing chamber (63), and the rear end face of the flange (101) abuts against the front axial end face of the inner ring of the connecting bearing (102).

3. The self-cleaning generator according to claim 1, characterized in that: A plurality of reinforcing ribs (7) are arranged at intervals on the outer peripheral surface connected to the bearing chamber (63), and the reinforcing ribs (7) extend axially and are connected to the rear end cover body (65).

4. The self-cleaning generator according to claim 1, characterized in that: The rear end cover (6) further comprises a rear end cover body (65) and a slip ring chamber (62), wherein a rear bearing chamber (61), a slip ring chamber (62) and a connecting bearing chamber (63) are sequentially formed on the inner surface of the rear end cover body (65) from front to back.

5. The self-cleaning generator according to claim 1, characterized in that: The rotor shaft (51) is connected to the connecting shaft (10) via a spline-like structure, the rear end of the rotor shaft (51) extends into an axial hole opened on the connecting shaft (10), and the axial hole of the connecting shaft (10) and the end surface of the rotor shaft (51) are respectively matched arc-shaped concave-convex structures.

6. The self-cleaning generator according to any one of claims 1 to 5, characterized in that: The cleaning mechanism comprises an axial flow fan (11), and brushes (111) are evenly arranged on the blade edge of the axial flow fan (11) on one side of the upper shield (9) of the rear end cover (6).

7. The self-cleaning generator according to claim 6, characterized in that: An axial threaded hole is provided at the rear end of the connecting shaft (10), and the axial flow fan (11) is installed in the threaded hole by means of bolts (112).

8. The self-cleaning generator according to claim 7, characterized in that: The thread direction of the connecting shaft (10) and the bolt (112) is the same as the rotation direction of the axial flow fan (11).

9. The self-cleaning generator according to claim 6, characterized in that: The cleaning mechanism also includes an annular baffle (12) arranged on the peripheral side of the axial flow fan (11), and the baffle (12) is fixed to the protective cover (9).

10. The self-cleaning generator according to claim 9, characterized in that: The baffle plate (12) is provided with a plurality of air discharge ports (121) at intervals.

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