Cooling structure of electric drive system

Abstract

The cooling structure of the electric drive system comprises a heat dissipation plate which is arranged on the bottom surface of a main shell of a driver and is internally provided with a heat dissipation cavity, and water channels which are arranged in a shell of a motor along the axial direction and comprise a first water channel and a second water channel, the central blind hole is formed in a rotating shaft of the motor; the radial hole is formed in the cover plate and is connected with the shaft extension pipe in the central blind hole; the annular cavity is arranged in a rear end cover of the motor; the water tank provides cooling liquid for the heat dissipation cavity through the water pump, flows into the center blind hole sequentially through the first water channel, the radial hole and the shaft extension pipe and then flows back to the water tank sequentially through the annular cavity and the second water channel from the center blind hole, and a water cooling loop is formed. According to the cooling structure of the electric drive system, an air cooling and water cooling combined type cooling structure is adopted, a motor and a driver assembly are designed to be in a water cooling structure series connection and air cooling structure parallel connection mode, all-directional dead-corner-free heat dissipation of the electric drive system is achieved, the power density of the electric drive system is ensured, and miniaturization and integration of the system are achieved; and the method has high practicability and wide applicability.

Description

Technical Field

[0001] The utility model relates to a cooling structure, in particular to a cooling structure for an electric drive system integrating air cooling and water cooling, belonging to the technical field of the cooling system of a motor and a driver assembly. Background Art

[0002] With the development of the integration technology of motor and driver assemblies, more and more electric drive systems integrate the motor and the driver in a limited space to reduce the product volume and weight, and further improve the power density of the electric drive system. With the improvement of the power density requirement of the electric drive system, the electric drive system needs to have good heat dissipation performance. As the key components of the electric drive system, the heat dissipation performance of the motor and the driver directly affects the working efficiency and reliability of the electric drive system. The electric drive system is greatly affected by temperature. When the motor and the driver have poor heat dissipation and the temperature is too high, it will cause the electric drive system to operate inefficiently, affect the system function, and in severe cases, it will cause the system to burn out. Therefore, the cooling structure of the electric drive system is crucial.

[0003] At present, most industrial electric drive systems adopt natural cooling and air cooling forms. Among them, the natural cooling has low heat dissipation efficiency, and the air cooling is not sufficient for the heat dissipation of the electric drive system. In order to ensure the heat dissipation reliability of the electric drive system, the heat dissipation structure sizes of the motor and the driver are often increased, resulting in a large space structure of the electric drive system, which is not conducive to the miniaturization design and power density improvement of the electric drive system.

[0004] Therefore, it is necessary to provide a cooling structure for an electric drive system. Summary of the Invention

[0005] To solve the deficiencies of the prior art, the purpose of the utility model is to provide a cooling structure for an electric drive system.

[0006] To achieve the above objectives, the utility model adopts the following technical solutions:

[0007] A cooling structure for an electric drive system, comprising

[0008] A heat dissipation plate provided on the bottom surface of the main housing of the driver, and a heat dissipation cavity is provided in the heat dissipation plate;

[0009] A water channel axially provided in the housing of the motor, including a first water channel and a second water channel;

[0010] A central blind hole provided in the rotating shaft of the motor;

[0011] A radial hole provided at the cover plate, and the radial hole is connected to a shaft extension pipe placed in the central blind hole;

[0012] An annular cavity provided in the rear end cover of the motor;

[0013] The water tank supplies coolant to the heat dissipation cavity through a water pump, and the coolant flows into the central blind hole successively through the first water channel, radial holes, and shaft extension pipes, and then flows back to the water tank from the central blind hole successively through the annular cavity and the second water channel, forming a water cooling loop.

[0014] The above-mentioned main housing is divided into a water tank and a hardware box.

[0015] The above-mentioned annular cavity includes a connected annular inner cavity and an annular outer cavity.

[0016] The above-mentioned first water channel is arranged at the top of the housing and is U-shaped along the axis;

[0017] The second water channel is arranged on both sides and the bottom of the housing and is S-shaped along the circumference.

[0018] Several heat dissipation pins are arranged in the heat dissipation cavity of the above-mentioned heat dissipation plate, and several heat dissipation fins are arranged on the bottom surface.

[0019] Furthermore, a first baffle and a second baffle are arranged in the heat dissipation cavity of the above-mentioned heat dissipation plate. The first baffle is used to extend the flow path of the heat dissipation liquid in the heat dissipation cavity, and the second baffle is used to separate an independent area in the heat dissipation cavity for the heat dissipation liquid to flow back into the water tank.

[0020] Several heat dissipation ribs are arranged on the outer wall of the housing at the second water channel.

[0021] A fan driven by a rotating shaft is arranged at the end of the above-mentioned motor, and a wind guide cover is arranged outside the fan; the fan is used to provide cooling air.

[0022] The beneficial effects of the present utility model are as follows:

[0023] A cooling structure of an electric drive system of the present utility model cools the components in the hardware box through a heat dissipation plate arranged at the bottom surface of the main housing of the driver, cools the rotating shaft through a central blind hole arranged in the rotating shaft of the motor, cools the stator assembly through a reciprocating water channel arranged in the outer shell of the motor, and forms a cooling loop through a water pump and a water tank for reciprocating cooling.

[0024] Combined with the heat dissipation pins arranged in the heat dissipation cavity of the heat dissipation plate, the heat dissipation fins arranged on the bottom surface of the heat dissipation plate, and several heat dissipation ribs arranged on both sides and the bottom of the motor housing, and the cooling air provided by the fan, the heat dissipation effect of the coolant is enhanced.

[0025] A cooling structure of an electric drive system of the present utility model adopts an air-cooled and water-cooled composite cooling structure, designs the motor and the driver assembly into a series water-cooled structure and a parallel air-cooled structure mode, realizes all-round and dead-angle-free heat dissipation of the electric drive system, ensures the power density of the electric drive system and realizes the miniaturization and integration of the system, and has strong practicability and wide applicability. Description of the Drawings

[0026] Figure 1It is a schematic structural diagram of the cooling structure of the electric drive system.

[0027] Figure 2 It is a schematic structural diagram of the driver.

[0028] Figure 3 It is a schematic structural diagram of the main housing.

[0029] Figure 4 It is a schematic structural diagram of the heat dissipation plate.

[0030] Figure 5 It is a schematic structural diagram of the heat sink.

[0031] Figure 6 It is a cross-sectional view of the schematic structural diagram of the cooling structure of the electric drive system.

[0032] Figure 7 It is a schematic structural diagram of the casing.

[0033] Figure 8 It is a side view of the schematic structural diagram of the casing.

[0034] Figure 9 It is a schematic structural diagram of the annular water channel 1.

[0035] Figure 10 It is a schematic structural diagram of the annular water channel 2.

[0036] Figure 11 It is a structural diagram of the rear end cover.

[0037] The meanings of the marks in the drawings are as follows:

[0038] 1. Motor assembly, 2. Driver assembly;

[0039] 11. Rotor assembly, 12. Stator assembly, 13. Front end cover, 14. Rear end cover, 15. Cover plate, 16. Fan, 17. Air guide cover;

[0040] 111. Rotating shaft, 112. Rotor core, 113. Front bearing, 114. Rear bearing, 115. Central blind hole;

[0041] 121. Casing, 122. Stator core;

[0042] 21. Main housing, 22. Heat dissipation plate, 23. Water pump;

[0043] 211. Water tank, 212. Hardware box, 213. Water tank cover plate, 214. Sealing cover plate; A1. First water inlet hole, B1. First water outlet hole;

[0044] 221. Heat dissipation cavity, 222. Heat dissipation pins, 223. First baffle wall, 224. Second baffle wall, 225. Heat dissipation fins; A2. Second water inlet hole, B2. Second water outlet hole;

[0045] 1211. Heat dissipation ribs, A3. Third water inlet hole, B3. Third water outlet hole, A4. Fourth water inlet hole, B4. Fourth water outlet hole; C1. First water tank, C2. Second water tank, C3. Third water tank, C4. Fourth water tank, C5. Fifth water tank;

[0046] 141. Annular inner cavity, 142. Annular outer cavity, 143. Annular wall, 144. Open slot, A5. Fifth water inlet hole, B5. Fifth water outlet hole;

[0047] 151. Radial hole, 152. Axial extension pipe. Specific embodiments

[0048] The present utility model will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0049] An electric drive system cooling structure is composed of a motor assembly 1 and a driver assembly 2. Preferably, the driver assembly is fixedly arranged on the top of the motor assembly; as Figure 1 shown.

[0050] The driver assembly is composed of a main housing 21, a heat dissipation plate 22, and a water pump 23; as Figure 2 shown.

[0051] The main housing is divided into a water tank 211 and a hardware box 212. A water tank cover plate 213 is installed on the water tank, and a sealing cover plate 213 is installed on the hardware box. The water tank is provided with a first water outlet hole A1 and a first water inlet hole B1. The water pump is installed on the side of the main housing and is used to pump the water in the water tank through the first water outlet hole to the heat dissipation cavity 221 of the heat dissipation plate; as Figure 3 shown.

[0052] The bottom surface of the heat dissipation plate is provided with a plurality of heat dissipation fins 225, and the top surface is a heat dissipation cavity 221; the heat dissipation cavity is closed by installing the heat dissipation plate on the bottom surface of the main housing. A plurality of heat dissipation pins 222 are arranged in the heat dissipation cavity, and a first baffle wall 223 and a second baffle wall 224 are provided. The first baffle wall is used to guide the heat dissipation liquid entering the heat dissipation cavity to the second water outlet hole B2. The second baffle wall is used to establish an isolation area for the second water inlet hole A2 in the heat dissipation cavity; as Figure 4 shown.

[0053] Preferably, the height of the heat dissipation fins is in a gradually changing manner, such as the end being arc-shaped, which is convenient for heat dissipation; as Figure 5 shown.

[0054] The motor assembly 1 is composed of a rotor assembly 11, a stator assembly 12, a front end cover 13, a rear end cover 14, a cover plate 15, a fan 16, and a wind guide cover 17, asFigure 6 as shown

[0055] Among them, the rotor assembly 11 is composed of a rotating shaft 111, a rotor core 112, a front bearing 113 and a rear bearing 114. The rotor core is fixedly connected to the rotating shaft, and the front bearing 113 and the rear bearing 114 are respectively arranged at both ends of the rotating shaft. A central blind hole 115 is provided on the rotating shaft of the rotor core section.

[0056] The stator assembly 13 is composed of a housing 121 and a stator core 122. The stator core is arranged around the rotor core, and the housing wraps and fixes the stator core.

[0057] The front end cover 13 and the rear end cover 14 are respectively arranged at both ends of the housing. Both ends of the rotating shaft protrude through the front end cover and the rear end cover through the front bearing 113 and the rear bearing 114.

[0058] The housing 121 is provided with a plurality of water tanks, including a first water tank C1, a second water tank C2, a third water tank C3, a fourth water tank C4, and a fifth water tank C5. The water tanks respectively form a closed first water channel and a second water channel under the assembly of the front end cover and the rear end cover; among them, the first water tank, the second water tank, and the third water tank are arranged on the top of the housing and are sequentially connected in series to form a first water channel in a U shape along the axis, as Figure 9 shown; the fourth water tank and the fifth water tank are arranged on both sides and the bottom of the housing in the circumferential direction and are connected in series to form an S-shaped second water channel, as Figure 10 shown. Along the flow direction of the coolant, the inlet end of the first water channel is the third water inlet hole A3, and the outlet end is the third water outlet hole B3; the inlet end of the second water channel is the fourth water inlet hole A4, and the outlet end is the fourth water outlet hole B4.

[0059] Preferably, a plurality of heat dissipation ribs 1211 are provided on the outer side surfaces of both sides and the bottom of the housing.

[0060] The second water outlet hole B2 of the heat dissipation cavity is communicated with the third water inlet hole A3 of the first water channel, so that the heat dissipation liquid enters the first water channel from the heat dissipation cavity and flows out from the third water outlet hole B3.

[0061] The rear end cover 14 is connected to the cover plate 15. The cover plate is provided with a radial hole 151 and a shaft extension tube 152; among them, one end of the radial hole is communicated with the shaft extension tube, and the other end is communicated with the third water outlet hole B3 of the first water channel through the fifth water inlet hole A5 of the rear end cover. The shaft extension tube is inserted into the central blind hole 115 of the rotating shaft.

[0062] A fan 16 is installed on the cover plate 15, and a wind guide cover 17 is installed outside the fan. When the fan rotates, the cooling air is blown towards the heat dissipation ribs of the housing.

[0063] The rear end cover 14 is internally provided with an annular inner cavity 141 and an annular outer cavity 142. An annular wall 143 separates the annular inner cavity and the annular outer cavity, and the annular inner cavity and the annular outer cavity are communicated through an opening groove 144. The central blind hole 115 of the rotating shaft is communicated with the annular inner cavity 141 of the rear end cover. The annular inner cavity 141 and the rotating shaft are sealed by a oil seal, and the oil seal is installed on the rear end cover 14.

[0064] Along the flow direction of the coolant, a fifth water outlet hole B5 is provided at the end of the annular outer cavity 142. The fifth water outlet hole communicates with the fourth water inlet hole A4 of the second water channel. That is, the coolant flows from the annular outer cavity 142 into the second water channel and then flows out from the fourth water outlet hole A4 at the end of the second water channel.

[0065] The fourth water outlet hole A4 of the second water channel communicates with the second water inlet hole A2 of the heat dissipation plate 22, and the second water inlet hole communicates with the first water inlet hole A1 of the water tank. That is, the coolant flows back into the water tank from the second water channel through the heat dissipation plate.

[0066] According to the cooling circuit, the coolant enters from the water tank through the heat dissipation plate, passes through the heat dissipation pins, and flows through the bottom of the housing to cool the components in the hardware box; at the same time, the coolant conducts heat through the heat dissipation pins to the heat dissipation fins of the heat dissipation plate, and the fan works to blow the cooling air from the air hood to the heat dissipation fins, and the heat dissipation fins cool the coolant in the heat dissipation plate, thereby realizing the cooling of the drive assembly.

[0067] When the coolant flows through the first water channel and the second water channel of the housing, it realizes the cooling of the stator core. The fan works to blow the cooling air from the air hood to the heat dissipation ribs of the housing, and the heat dissipation ribs cool the coolant in the housing, thereby realizing the cooling of the motor assembly.

[0068] The coolant flows through the central blind hole in the rotating shaft, thereby realizing the cooling of the rotor.

[0069] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form. Any technical solutions obtained by using equivalent replacements or equivalent transformations fall within the protection scope of the present invention.

Claims

1. An electric drive system cooling structure, characterized in that including a heat dissipation plate disposed on the bottom surface of the main housing of the driver, a heat dissipation cavity being provided in the heat dissipation plate; a water channel axially disposed in the housing of the motor, including a first water channel and a second water channel; a central blind hole disposed in the rotating shaft of the motor; a radial hole disposed at the cover plate, the radial hole being connected to a shaft extension tube placed in the central blind hole; an annular cavity disposed in the rear end cover of the motor; The water tank provides coolant for the heat dissipation cavity through a water pump, and flows through the first water channel, the radial hole, and the shaft extension tube into the central blind hole in sequence, and then flows back to the water tank through the central blind hole, the annular cavity, and the second water channel in sequence to form a water cooling loop.

2. The cooling structure of the electric drive system according to claim 1, characterized in that The main housing is divided into a water tank and a hardware box.

3. The cooling structure of the electric drive system according to claim 1, wherein The annular cavity includes a communicating annular inner cavity and an annular outer cavity.

4. The cooling structure of the electric drive system according to claim 1, characterized in that, The first water channel is disposed at the top of the housing and is U-shaped axially; The second water channel is disposed at the two side portions and the bottom of the housing and is S-shaped circumferentially.

5. The cooling structure of the electric drive system according to claim 1, characterized in that, A number of heat dissipation pins are provided in the heat dissipation cavity of the heat dissipation plate, and a number of heat dissipation plates are provided on the bottom surface.

6. The cooling structure of the electric drive system according to claim 5, characterized in that, A first partition wall and a second partition wall are provided in the heat dissipation cavity of the heat dissipation plate. The first partition wall is used to extend the flow path of the heat dissipation liquid in the heat dissipation cavity, and the second partition wall is used to separate an independent area in the heat dissipation cavity for the heat dissipation liquid to flow back into the water tank.

7. The cooling structure of the electric drive system according to claim 1, characterized in that A number of heat dissipation ribs are provided on the outer wall of the housing at the second water channel.

8. The cooling structure of the electric drive system according to claim 1, wherein, A fan driven by the rotating shaft is provided at the end of the motor, and a wind guide cover is provided outside the fan; the fan is used to provide cooling air.

Images