Totally-closed self-circulation air cooling structure of motor

Abstract

The utility model belongs to the technical field of motor heat dissipation, and particularly relates to a fully-closed self-circulation air cooling structure of a motor, which comprises a sealing casing, a framework oil seal, a front end cover, a front bearing, a first screw, a front air guide ring, a centrifugal fan blade, a winding, a stator core, an axial flow fan blade, a rear end cover, a rear bearing, a second screw, a rear air guide ring, a rotor, a rotating shaft and a connection relation thereof. According to the utility model, an inner-layer space and an outer-layer space which are communicated with each other are arranged in the totally-enclosed motor, air in the inner-layer space and the outer-layer space is forced to flow under the action that the centrifugal fan blades and the axial flow fan blades rotate along with the rotating shaft, heat in the inner-layer space of the motor is circularly conducted to the outer-layer low-temperature space, and the heat can be quickly dissipated by the casing on the outer side; and heat generated by the motor during working is quickly dissipated out of the whole motor.

Description

Technical Field

[0001] The utility model relates to the technical field of motor heat dissipation, in particular to a fully enclosed self-circulating air cooling structure for a motor. Background Art

[0002] The motor is a device that converts electrical energy into mechanical energy. During the energy conversion process, there will be energy loss and heat generation. Excessive energy generation will cause the internal structure of the motor to burn. In other words, the heat dissipation capacity of the motor is one of the important factors that determine the rated power of the motor.

[0003] Conventional motors generate heat, which is conducted along the outer wall of the stator to the motor housing. The motor housing contacts the air in the working environment and exchanges heat to remove the heat generated by the motor. In other words, the closer to the motor housing, the lower the temperature of the motor. According to the working principle of the motor, the most serious heating point of the motor is between the stator and the rotor, that is, the air gap of the motor. Part of the heat here needs to be transferred to the winding through heat conduction before the stator core can be conducted to the housing. The other part will gather on the surface of the motor rotor and is difficult to dissipate heat. Therefore, the heat transfer efficiency is low, and this position is prone to overheating first. Utility Model Content

[0004] The utility model aims to provide a fully enclosed self-circulating air cooling structure for a motor, which can conduct the heat in the motor out without contacting the motor with the outside air in a closed space.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A fully enclosed self-circulating air-cooling structure for a motor comprises a sealed casing, in which a front air guide ring, centrifugal blades, a rotor, a winding, a stator core, axial-flow blades and a rear air guide ring are installed; the winding is arranged on the outer periphery of the rotor with a motor air gap therebetween, the stator core is provided with an air duct along its axial direction, and the air duct is located outside the motor air gap; one side of the motor air gap and the air duct are connected through a front air guide ring, and the other side is connected through a rear air guide ring; centrifugal blades and axial-flow blades are respectively installed at both ends of the rotor, the centrifugal blades are arranged close to the front air guide ring, and the axial-flow blades are arranged close to the rear air guide ring.

[0007] The following is a technical solution further defined by the present invention: the sealed housing comprises a main housing, a front end cover and a rear end cover, and the front end cover and the rear end cover are respectively installed at two ends of the main housing.

[0008] The following is a technical solution further defined by the present utility model, wherein the rotor includes a rotating shaft, on which centrifugal fan blades and axial flow fan blades are mounted, one end of the rotating shaft is mounted on the rear end cover through a rear bearing, and the other end of the rotating shaft is mounted on the front end cover through a front bearing and passes through the front end cover.

[0009] The following is a technical solution further defined by the present utility model: a skeleton oil seal is installed between the front end cover and the rotating shaft.

[0010] The following is a technical solution further defined by the present utility model, wherein the front air guide ring is integrally provided with an air blocking ring at the middle position of the inner wall in the circumferential direction thereof, the front air guide ring is integrally provided with a mounting ring at its axial end portion, the mounting ring is provided with a plurality of mounting holes, the front air guide ring is provided with a plurality of air inlet holes in the circumferential direction thereof, and the air inlet holes are located between the air blocking ring and the mounting ring.

[0011] The following is a technical solution further defined by the present utility model: one end of the front air guide ring is fixedly connected to the front end cover by a screw passing through the mounting hole, and the other end is abutted against the winding.

[0012] The following is a technical solution further defined by the present utility model: one end of the rear air guide ring is inserted into the rotating shaft, and the other end is fixedly connected to the rear end cover by screw two.

[0013] The following is a technical solution further defined by the present utility model: the winding is fixedly connected to the stator core, and the stator core is fixedly connected to the main housing.

[0014] The following is a technical solution further defined by the present utility model: evenly arranged heat dissipation ribs are integrally provided on the outer periphery of the main shell.

[0015] Compared with the prior art, the utility model has the following technical effects:

[0016] The utility model provides two interconnected spaces, inner and outer, in a fully enclosed motor. When the centrifugal fan blades and the axial flow fan blades rotate along with the shaft, air in the inner and outer spaces is forced to flow, and the heat of the inner space of the motor is circulated and conducted to the outer low-temperature space. The outer casing can quickly dissipate the heat, so that the heat generated by the motor at work can be quickly dissipated from the entire motor.

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a half-section structural schematic diagram of the utility model;

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the utility model;

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the front air guide ring in the utility model;

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the centrifugal fan blade in the utility model;

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the axial flow fan blade in the utility model.

[0024] In the figure, 1. skeleton oil seal; 2. front end cover; 3. front bearing; 4. screw one; 5. front air guide ring; 501. air inlet hole; 502. mounting hole; 503. wind blocking ring; 6. centrifugal fan blade; 7. winding; 8. main housing; 801. heat dissipation rib; 9. stator core; 901. air duct; 10. motor air gap; 11. axial flow fan blade; 12. rear end cover; 13. rear bearing; 14. screw two; 15. rear air guide ring; 16. rotor; 161. rotating shaft. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

[0027] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0028] like Figure 1-5 As shown, this embodiment provides a fully enclosed self-circulating air-cooling structure of a motor, including a sealed casing, in which a skeleton oil seal 1, a front cover 2, a front bearing 3, a screw 1 4, a front air guide ring 5, a centrifugal fan blade 6, a winding 7, a stator core 9, an axial flow fan blade 11, a rear end cover 12, a rear bearing 13, a screw 2 14, a rear air guide ring 15, a rotor 16, and a rotating shaft 161 are installed.

[0029] like Figure 1 and 2 As shown, the sealed housing includes a main housing 8, a front cover 2 and a rear cover 12, and the front cover 2 and the rear cover 12 are respectively sealed and installed at both ends of the main housing 8. It should be noted that the sealing structure between the front cover 2 and the rear cover 12 and the main housing 8 is a prior art, and the sealing effect is achieved by using concave and convex embedding and a sealing ring, but it is not limited to this structure, as long as the sealing performance of the sealed housing can be guaranteed, therefore, the sealing structure in this embodiment is only used for those skilled in the art to understand that the sealed housing has good sealing performance.

[0030] The winding 7 is embedded in the stator core 9 and fixedly mounted on the inner wall of the stator core 9 . The stator core 9 is sleeved on the main housing 8 and fixedly mounted on the inner wall of the main housing 8 , thereby fixing the stator core 9 and the winding 7 .

[0031] The rotor 16 is mainly composed of three parts: a rotor 16 core, a permanent magnet and a rotating shaft 161 .

[0032] The winding 7 is located on the outer circumferential side of the permanent magnet of the rotor 16 with a motor air gap 10 therebetween. Since it is a circumferential gap, the radial cross-section of the motor air gap 10 is annular.

[0033] The stator core 9 is provided with air ducts 901 along its axial direction. There are multiple air ducts 901 , which are evenly distributed in the circumferential direction of the stator core 9 .

[0034] The motor air gap 10 and the air duct 901 are both arranged along the axial direction. The air duct 901 is located outside the motor air gap 10.

[0035] The left side of the motor air gap 10 and the air duct 901 are connected through the front air guide ring 5, and the right side is connected through the rear air guide ring 15. The left end of the front air guide ring 5 is fixedly connected to the front cover 2 through the mounting hole 502 by screw 14, and the right end is in contact with the winding 7. The left end of the rear air guide ring 15 is inserted into the rotating shaft 161 and the two are just in contact, and the right end is fixedly connected to the rear cover 12 by screw 2 14. The rear air guide ring 15 has an inclined side wall, which can guide the airflow of the motor air gap 10 to turn and flow into the air duct 901.

[0036] like Figure 3 As shown, the front air guide ring 5 is integrally provided with an air blocking ring 503 at the middle position of the inner wall in the circumferential direction, and the front air guide ring 5 is integrally provided with a mounting ring at its axial end, and a plurality of mounting holes 502 are provided on the mounting ring, and the front air guide ring 5 is provided with a plurality of air inlet holes 501 in the circumferential direction, and the air inlet holes 501 are located between the air blocking ring 503 and the mounting ring.

[0037] like Figure 1 , 4 As shown in Figures 5 and 6, the centrifugal blades 6 and the axial flow blades 11 are respectively sleeved on the left and right ends of the rotating shaft 161, and are fixed by screws after being sleeved. The rotating shaft 161 is fixed to the main housing 8 through the front bearing 3, the front cover 2, the rear bearing 13 and the rear cover 12, that is, the right end of the rotating shaft 161 is installed on the rear cover 12 through the rear bearing 13, and the left end of the rotating shaft 161 is installed on the front cover 2 through the front bearing 3 and passes through the front cover 2 to extend to the outside of the sealed housing. The front cover 2 and the rear cover 12 are both fixed to the main housing 8 by screws.

[0038] The skeleton oil seal 1 is pressed into the front end cover 2 to ensure the sealing between the front end cover 2 and the rotating shaft 161 .

[0039] Thus, a closed space is formed inside the motor, and the front air ring 5 fits with the winding 7, so that the interior is divided into two spaces, the inner and outer spaces. The centrifugal blades 6, the axial flow blades 11, and the motor air gap 10 are located in the inner space; the air duct 901 is located in the outer space.

[0040] When the motor winding 7 is energized and the motor rotor 16 rotates, the centrifugal blades 6 and the axial flow blades 11 sleeved on the rotating shaft 161 rotate together.

[0041] The centrifugal fan blades 6 suck the air from the upper part of the front end cover 2 of the motor into the fan blade holes and then radiate the air toward the sides and blow it into the motor air gap 10. After the air flows into the motor air gap 10, the axial flow fan accelerates the air to blow it out. The blown air is guided by the rear air guide ring 15, turns around and flows into the air duct 901 of the stator core 9, and then is sucked in by the centrifugal fan blades 6 through the air inlet holes 501 on the front air guide ring 5 and then blown out.

[0042] In this way, the internal air forms an orderly circulation, and the heat in the motor air gap 10 is brought to the vicinity of the main housing 8 with a lower temperature through forced air flow. The main housing 8 can quickly dissipate the heat, so that the temperature in the motor air gap 10 can quickly dissipate from the motor as a whole. In this way, the heat dissipation of the inner structure of the motor, which was originally only possible by heat conduction from the inner structure to the outer structure or by external air convection, can now be accelerated by forced air flow. The heat dissipation efficiency is high, and no external air convection heat dissipation is required, which is suitable for the heat dissipation of sealed motors.

[0043] Furthermore, if Figure 1 and 2 As shown, evenly distributed heat dissipation ribs 801 are integrally provided on the outer periphery of the main housing 8 to increase the heat dissipation area, which is beneficial for faster heat exchange between the motor and the outside world.

[0044] The centrifugal blades 6 and the axial flow blades 11 are both made of carbon fiber materials, and are light in weight and have a small moment of inertia.

[0045] The exhaust direction of the centrifugal fan blades 6 is to take in air parallel to the axis, and then exhaust air obliquely toward the motor air gap 10.

[0046] A circulation flow is formed inside the motor to force the internal air to pass through the motor air gap 10 and the air duct 901, so that the temperature at each position inside the motor is uniform, avoiding the phenomenon that the farther away from the casing, the higher the temperature and the more difficult the heat dissipation is, which is beneficial to the heat dissipation of the motor.

[0047] At the same time, fan blades are installed inside the sealed motor. Since there is no external air entering, the fan blades can be maintenance-free, and the protection level of the motor can reach IP65. The motor can be used in working environments that require maintenance-free or difficult maintenance. That is, the use environment of the motor can match the use environment of the self-cooling motor.

[0048] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the utility model by using the above disclosed methods and technical contents without departing from the scope of the technical solution of the utility model, or modify it into an equivalent embodiment of equivalent changes. Therefore, all equivalent changes made according to the shape, structure and principle of the utility model without departing from the content of the technical solution of the utility model should be included in the protection scope of the utility model.

Claims

1. A fully enclosed self-circulating air-cooling structure for a motor, characterized in that: It comprises a sealed casing, in which a front air guide ring (5), centrifugal blades (6), a rotor (16), a winding (7), a stator core (9), axial flow blades (11), and a rear air guide ring (15) are installed; The winding (7) is arranged on the outer periphery of the rotor (16) with a motor air gap (10) therebetween, and the stator core (9) is provided with an air duct (901) along its axial direction, and the air duct (901) is located outside the motor air gap (10); The motor air gap (10) and the air duct (901) are connected on one side via a front air guide ring (5), and are connected on the other side via a rear air guide ring (15); Centrifugal blades (6) and axial flow blades (11) are respectively installed at both ends of the rotor (16); the centrifugal blades (6) are arranged close to the front air guide ring (5), and the axial flow blades (11) are arranged close to the rear air guide ring (15).

2. A fully enclosed self-circulating air-cooling structure for a motor as claimed in claim 1, characterized in that: The sealed housing comprises a main housing (8), a front end cover (2) and a rear end cover (12), wherein the front end cover (2) and the rear end cover (12) are respectively mounted at two ends of the main housing (8).

3. A fully enclosed self-circulating air-cooling structure for a motor as claimed in claim 2, characterized in that: The rotor (16) comprises a rotating shaft (161), on which centrifugal blades (6) and axial flow blades (11) are mounted, one end of the rotating shaft (161) is mounted on the rear end cover (12) via a rear bearing (13), and the other end of the rotating shaft (161) is mounted on the front end cover (2) via a front bearing (3) and passes through the front end cover (2).

4. A fully enclosed self-circulating air-cooling structure for a motor as claimed in claim 3, characterized in that: A skeleton oil seal (1) is installed between the front end cover (2) and the rotating shaft (161).

5. A fully enclosed self-circulating air-cooling structure for a motor as claimed in claim 2, characterized in that: The front air guide ring (5) is integrally provided with an air blocking ring (503) at the middle position of the inner wall in the circumferential direction thereof, the front air guide ring (5) is integrally provided with a mounting ring at its axial end, the mounting ring is provided with a plurality of mounting holes (502), the front air guide ring (5) is provided with a plurality of air inlet holes (501) in the circumferential direction thereof, the air inlet holes (501) being located between the air blocking ring (503) and the mounting ring.

6. A fully enclosed self-circulating air-cooling structure for a motor as claimed in claim 5, characterized in that: One end of the front air guide ring (5) is fixedly connected to the front end cover (2) by means of a screw (4) passing through the mounting hole (502), and the other end is in contact with the winding (7).

7. A fully enclosed self-circulating air-cooling structure for a motor as claimed in claim 2, characterized in that: One end of the rear air guide ring (15) is inserted into the rotating shaft (161), and the other end is fixedly connected to the rear end cover (12) via a second screw (14).

8. A fully enclosed self-circulating air-cooling structure for a motor as claimed in claim 2, characterized in that: The winding (7) and the stator core (9) are fixedly connected, and the stator core (9) and the main housing (8) are fixedly connected.

9. A fully enclosed self-circulating air-cooling structure for a motor as claimed in claim 2, characterized in that: Evenly distributed heat dissipation ribs (801) are integrally provided on the outer periphery of the main shell (8).

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