Multi-channel water-cooled ac motor

Abstract

The application discloses a multi-flow channel water-cooled alternating current motor, which has a shell with a shaped water-cooled channel, and the shell has two bent flow channels separated by an annular middle rib plate, one of the two bent flow channels is arranged close to a front end cover, and the other bent flow channel is arranged close to a rear end cover, so that the two bent flow channels respectively radiate heat from the parts close to the front end cover and the rear end cover.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, and specifically relates to a multi-channel water-cooled AC motor. Background Technology

[0002] As an energy conversion device, an electric motor typically utilizes its characteristic of converting electrical energy into kinetic energy. However, it also has the characteristic of converting some of its energy into heat during operation, and the heat it releases during operation cannot be ignored. Depending on the situation, problems such as burnt-out motor coils may occur.

[0003] Traditionally, to address the issue of heat dissipation during motor operation, a coaxial fan is installed inside the rear cover of the motor to dissipate heat through airflow. Later, the development of water-cooled motors gradually began.

[0004] Patent Document 1: An outer cover is set on the outside of the housing, and a water inlet and an outlet are set. The gap between the threads on the outer cover and the outer diameter of the housing form a water flow channel. The water flows in from the inlet, flows through the gap between the threads, and finally flows out from the outlet, thereby cooling the motor.

[0005] Patent Document 2: A cooling cavity for cooling various components inside the motor housing is provided on the wall of the motor housing, and an inlet and an outlet for liquid to be connected to the cooling cavity respectively. The cooling cavity is formed by a baffle plate, and multiple baffle plates are arranged in a staggered manner in the cooling cavity to form a cooling channel that is bent as a whole.

[0006] Patent Document 3: A plurality of partition walls are erected at predetermined angles along the central axis on a generally cylindrical inner wall. A plurality of outflow paths and a plurality of return paths are formed between the plurality of partition walls and the outer peripheral surface of the motor, extending parallel to each other along the central axis. A first cover closes the first opening of the cylindrical flow path section and has a plurality of reversible flow paths that connect the return flow paths to the subsequent outflow paths. A second cover closes the second opening of the cylindrical flow path section and has a plurality of reversible flow paths that connect the outflow paths to the subsequent return flow paths. A water supply section and a drainage section are provided.

[0007] Most existing technologies disclose single-channel water-cooled motors. Although numerous deflection structures are incorporated within the motor housing to maximize the distance the cooling medium travels within the housing, the internal heat generation and dissipation efficiencies of the motor vary due to its structural characteristics. This is especially true when a coaxially driven fan is installed within the rear end cover of the motor; the portion near the rear end cover exhibits superior heat dissipation. Excessively extending the cooling channel through excessive deflection does not significantly improve water cooling efficiency, particularly since the cooling medium reaches its optimal heat exchange state in the middle of the cooling channel, and subsequent flow within the channel does not provide a substantial cooling effect.

[0008] Existing technical documents:

[0009] Patent document 1-CN201210545703.3;

[0010] Patent document 2-CN201810850388.2;

[0011] Patent document 3-CN201380060852.3. Summary of the Invention

[0012] This invention addresses the problems of existing technologies by providing a multi-channel water-cooled AC motor, specifically solving the problem that cooling in a single-channel configuration cannot achieve optimal performance. The specific technical solution is as follows:

[0013] A multi-channel water-cooled AC motor has a housing with shaped water-cooling channels, and the AC motor is cooled by a cooling medium filled into the water-cooling channels;

[0014] The housing has:

[0015] The shell has two bent flow channels separated by an annular central rib. The bent flow channels include an inlet flow channel, an outlet flow channel, and several circulation flow channels arranged axially within the shell wall. The shell has multiple reversing flow channels at the connecting end face, which allow the cooling medium in the inlet flow channel to be turned back to the adjacent circulation flow channel, the cooling medium in the circulation flow channel to be turned back to the next adjacent circulation flow channel, and the cooling medium in the circulation flow channel to be turned back to the outlet flow channel. The shell also has multiple reversing flow channels at the annular central rib, which allow the cooling medium in the inlet flow channel to be turned back to the adjacent circulation flow channel, the cooling medium in the circulation flow channel to be turned back to the next adjacent circulation flow channel, and the cooling medium in the circulation flow channel to be turned back to the outlet flow channel.

[0016] The liquid inlet is connected to the liquid inlet channel, and the annular central rib plate has a notch at the liquid inlet that connects two bent channels;

[0017] The liquid outlet is connected to the liquid outlet channel, and the annular central rib plate has a notch at the liquid outlet that connects the two bent channels.

[0018] As a preferred embodiment of the above technical solution, it also includes a rear end cover installed at the rear of the housing, with the rear end cover forming a forced air-cooling cavity between the housing and the housing.

[0019] As a preferred embodiment of the above technical solution, the connecting surface of the rear end cover has a mounting hole, and a channel one and a channel two extending from the mounting hole into the forced air cooling cavity. A one-way valve that allows liquid to flow from the shell to the rear end cover is installed in the mounting hole. A nozzle is installed at the outlet of the channel one, and a pressure device is connected to the channel two. The pressure device can introduce cooling medium and spray it into the forced air cooling cavity through the nozzle.

[0020] As a preferred embodiment of the above technical solution, the pressure device is a piston cylinder, and a drive gear is mounted on the shaft of the AC motor. The drive gear drives the piston of the piston cylinder to reciprocate through a reduction gearbox and a connecting rod in sequence.

[0021] As a preferred embodiment of the above technical solution, the piston is drawn out and introduced into the cooling medium, and then pushed to spray the cooling medium from the nozzle into the forced air cooling chamber.

[0022] As a preferred embodiment of the above technical solution, the cooling medium is cooling water.

[0023] The beneficial effects of this invention are as follows: Two bent flow channels are used to cool and dissipate heat from different parts inside the motor. This addresses the uneven heat dissipation problem caused by traditional fan cooling, where heat dissipation becomes less effective closer to the front cover. While ensuring full coverage of the motor circumference by the bent flow channels, the distance of the bent flow channels is shortened. Excessive length of the bent flow channels leads to ineffective subsequent heat exchange. The two bent flow channels dissipate heat from the parts near the front and rear covers respectively, improving the purposefulness and efficiency of heat dissipation. Furthermore, by adding a self-driving spray cooling structure to the existing heat dissipation structure, the overall heat dissipation performance can be improved by further enhancing the cooling effect at the tail end. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the cross-sectional structure of the shell 10;

[0025] Figure 2 for Figure 1 Schematic diagram of the structure of AA;

[0026] Figure 3 for Figure 1 Schematic diagram of the structure of BB;

[0027] Figure 4 for Figure 1 A schematic diagram of the structure of CC;

[0028] Figure 5 for Figure 4 Schematic diagram of the structure of DD;

[0029] Figure 6 for Figure 4 Schematic diagram of the structure of EE;

[0030] Figure 7 for Figure 3 A schematic diagram of the local structure at point F in the middle;

[0031] Figure 8 This is a schematic diagram of the structure of the housing located on the inner end face of the rear cover.

[0032] Figure 9This is a schematic diagram of the gearbox assembly. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0034] Example

[0035] Figures 1-4 The image below is a schematic diagram of the multi-channel water-cooled AC motor according to this embodiment. The multi-channel design is formed inside the motor housing 10. Figure 1 This is a schematic diagram of the cross-sectional structure of the shell 10. Figure 2 for Figure 1 A schematic diagram of the structure of AA. Figure 3 for Figure 1 A structural diagram of BB. Figure 4 for Figure 1 A schematic diagram of the structure of CC.

[0036] Figure 1 In the case, the outer side of the housing 10 is connected to the liquid inlet pipe 12 and the liquid outlet pipe 11. The liquid inlet pipe 12 is used for the input of cooling medium to achieve heat exchange and cooling. The cooling medium after heat exchange is discharged through the liquid outlet pipe 11.

[0037] Figures 2-4 In the shell 10, the shell wall has two bent flow channels, which are separated by an annular central rib plate 13. One of the bent flow channels is located near the front end cover 20, and the other is located near the rear end cover. The annular central rib plate 13 forms a notch at the connection between the liquid inlet pipe 12 and the liquid outlet pipe 11, so that the cooling medium input by the liquid inlet pipe 12 can flow into the two bent flow channels at the same time and can be discharged through the liquid outlet pipe 11 at the same time.

[0038] In this embodiment, the two bent flow channels are identical in structure except for the design differences in the cooling location and flow channel length. Therefore, this embodiment will provide a detailed structural description of the bent flow channel located near the front cover 20.

[0039] Figure 1 The housing 10 has an inlet channel 21 and an outlet channel 22. The inlet channel 21 is connected to the inlet pipe 12, and the outlet channel 22 is connected to the outlet pipe 11. In addition, the housing 10 also has circulation channels 31 (31a, 31b, 31c, 31d, 31e, 31f, 31g, 31h). Figure 1Using the plane of the structural diagram as a reference, the cooling medium outflow plane is represented by "·", and the cooling medium inflow plane is represented by "×". Specifically, the cooling medium input by the inlet pipe 12 passes through the inlet channel 21 and then turns back into the circulation channel 31a at the sealing connection surface between the housing 10 and the front cover 20. The cooling medium in the circulation channel 31a turns back into the circulation channel 31b at the annular central rib plate 13. This cycle continues until the cooling medium enters the outlet channel 22 and is discharged through the outlet pipe 11. Thus, the heat exchange between the cooling medium and the housing 10 helps the motor to dissipate heat.

[0040] Similarly, the bent flow channel located near the rear end cover can be completely mirrored and replicated with the annular central stiffener 13.

[0041] Figure 5 and 6 In the middle, the adjacent circulation channels 31 are connected at the ends, and the two ends of the same circulation channel 31 are connected to the two adjacent circulation channels 31 at the sealing connection surface of the front cover 20 and the annular middle rib plate 13, respectively, thus forming a continuously bent S-shaped flow channel.

[0042] Figures 2-4 In the case, a rear end cover 30 is usually installed at the tail of the housing 10. A forced air cooling cavity 14 is formed between the rear end cover 30 and the housing 10. That is, a fan blade (not shown in the figure) is installed inside the rear end cover 30. The fan blade is fixedly installed on the rotor shaft of the motor. The kinetic energy of the motor when it is working is used to drive the fan blade to rotate, thereby promoting the airflow circulation in the forced air cooling cavity 14 to achieve the purpose of forced air cooling.

[0043] In some embodiments of the present invention, the rear end cover 30 is modified to improve the heat exchange effect inside the forced air-cooled cavity 14. Specifically, Figure 7 In the design, mounting holes are formed on the connecting surface of the rear end cover 30. These mounting holes correspond to any one of the circulation channel 31, the inlet channel 21, and the outlet channel 22. A one-way valve 41 is installed in the mounting hole, allowing liquid to flow from the housing 10 towards the rear end cover 30. The mounting holes extend into the forced air cooling chamber 14, forming a through channel 1 42 and a through channel 2 43. A nozzle 44 is installed at the outlet of channel 1 42, and channel 2 43 is connected to a pressure device 45. The pressure device 45 is a piston cylinder. Through the piston movement of the piston cylinder, the cooling medium in the circulation channel 31, the inlet channel 21, or the outlet channel 22 is introduced into channel 1 42. Then, the introduced cooling medium is atomized and sprayed into the forced air cooling chamber 14 through the nozzle 44 via the piston cylinder. The atomized cooling medium readily absorbs heat, and since the temperature of the cooling medium in the circulation channel 31 is relatively low, it can achieve a significant cooling effect when it comes into contact with the high-temperature rear end cover 30 and fan blades.

[0044] In some embodiments of the present invention, the mounting hole is provided corresponding to the liquid inlet channel 21, thereby improving the heat dissipation effect inside the forced air cooling cavity 14.

[0045] Figure 8 Inside the forced air-cooling chamber 14, a drive gear 51 is coaxially mounted on the motor shaft. A reduction gearbox 52 and a pressure device 45 are fixed on the end face of the housing 10. The input source of the reduction gearbox 52 is the drive gear 51, and the output source of the reduction gearbox 52 is the connecting rod 53. The connecting rod 53 is rotatably connected to the piston drive rod of the pressure device 45. The other end of the pressure device 45 is connected to channel 2 43 through a pipe. When the motor is working, the drive gear 51 and the reduction gearbox 52 work together to reduce the speed of the motor shaft and output to the pressure device 45, so that the pressure device 45 smoothly sprays the cooling medium into the forced air-cooling chamber 14.

[0046] Figure 9 The diagram shows the internal structure of the gearbox 52 in some specific embodiments, which uses two coaxial gears and an output gear to achieve multi-stage speed reduction.

[0047] In this embodiment, cooling water or low-temperature brine is preferred as the cooling medium, so that it can be sprayed out through nozzle 44.

[0048] In this embodiment, the connection surfaces of both ends of the housing 10 with the front cover 20 and the rear cover 30 are sealed. For example, annular sealing rings can be embedded in the end faces of the front cover 20 and the rear cover 30.

[0049] It should be noted that in this embodiment, the power cord of the motor and the junction box can be set at any position that avoids the circulation channel 31, the inlet channel 21 and the outlet channel 22.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A multi-channel water-cooled AC motor, characterized in that, The housing (10) has a shaped water-cooling channel, and the AC motor is cooled by the cooling medium filled in the water-cooling channel; The housing (10) has: Two bent flow channels separated by an annular central rib plate (13) include an inlet flow channel (21), an outlet flow channel (22) and several circulation flow channels (31) arranged axially inside the shell wall of the shell (10). The shell (10) has multiple reversing flow channels at the connecting end face, which allow the cooling medium in the inlet flow channel (21) to be turned back to the adjacent circulation flow channel (31), the cooling medium in the circulation flow channel (31) to be turned back to the next adjacent circulation flow channel (31), and the cooling medium in the circulation flow channel (31) to be turned back to the outlet flow channel (22). The shell (10) has multiple reversing flow channels at the annular central rib plate (13), which allow the cooling medium in the inlet flow channel (21) to be turned back to the adjacent circulation flow channel (31), the cooling medium in the circulation flow channel (31) to be turned back to the next adjacent circulation flow channel (31), and the cooling medium in the circulation flow channel (31) to be turned back to the outlet flow channel (22). The inlet is connected to the inlet channel (21), and the annular central rib plate (13) has a notch at the inlet that connects the two bent channels; The liquid outlet is connected to the liquid outlet channel (22), and the annular central rib plate (13) has a notch at the liquid outlet that connects the two bent channels; It also includes a rear end cover (30) installed at the tail of the housing (10), and a forced air-cooled cavity (14) is formed between the rear end cover (30) and the housing (10). The connecting surface of the rear end cover (30) has a mounting hole, and a channel one (42) and a channel two (43) extending from the mounting hole into the forced air cooling chamber (14). A one-way valve (41) that allows liquid to flow from the housing (10) to the rear end cover (30) is installed in the mounting hole. A nozzle (44) is installed at the outlet of the channel one (42). The channel two (43) is connected to a pressure device (45). The pressure device (45) can introduce cooling medium and spray it into the forced air cooling chamber (14) through the nozzle (44). The pressure device (45) is a piston cylinder. A drive gear (51) is installed on the shaft of the AC motor. The drive gear (51) drives the piston of the piston cylinder to reciprocate through the reduction gearbox (52) and the connecting rod (53) in sequence.

2. The multi-channel water-cooled AC motor according to claim 1, characterized in that, After the piston cylinder is drawn out and the cooling medium is introduced, it is pushed to spray the cooling medium from the nozzle (44) into the forced air cooling chamber (14).

3. The multi-channel water-cooled AC motor according to claim 1 or 2, characterized in that, The cooling medium is cooling water.

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