TWM492957U - Water-cooling electric water pump - Google Patents

Description

Water cooled electric pump

The present invention is a water-cooled electric pump, especially a pump that pressurizes a water flow liquid, and through a suitable water channel and a sealing device, can direct a positive pressure water flow of the pump output through the motor casing surface and an electronic controller. The thermal pad helps the system to dissipate heat, so that the heat generated by the motor and the controller can be brought out of the system through heat exchange, which improves the overall operating efficiency and prolongs the service life.

In the operation of the pump, the cooling of the motor during continuous operation is quite important. Due to the resistance of the motor coil and the continuous heat generated by the silicon steel sheet during electromagnetic exchange, the operating temperature of the motor will increase, resulting in The performance of the motor is degraded, and the insulation of the motor coil is destroyed, which in turn affects the service life of the motor. Therefore, the heat dissipation of the motor has always been the most important issue to increase the pump performance and service life.

In the past, the pumped motor uses air-cooled design to dissipate heat. Due to the simple structure of air-cooled heat dissipation and low production cost, it has always been the main way to dissipate heat. However, the heat capacity of air is small and the heat conduction is slow, and the installation environment needs good. Convection, therefore, the cooling effect of the air-cooled design is limited by the installation environment. In addition, the noise generated by the air-cooled fan operation and the airflow will also affect the quality of the environment.

If liquid is used as the medium for heat exchange, it can effectively improve the shortcomings of air heat conduction. For example, the water common in daily life is twenty-three times that of air, which means that the speed of water dissipation is much higher. In the air, the pressurization and delivery of water is the purpose of pump operation. Therefore, the prior art has developed a pump design that can combine the transport of water and cool the motor with water.

In the prior art, the water flow from the pump is used for heat dissipation of the motor. When the pump is running, the water inlet located inside the pump forms a negative pressure zone, thereby drawing the water outside the pump into the pump. However, the water flows in the negative. Under the pressure environment, the evaporation temperature of the water flow will be lowered, that is, as long as the water flow is slightly increased due to the influence of the contact object, the water flow will be vaporized. Therefore, after the water of the water inlet flows to absorb the heat energy of the motor, Due to the temperature rise and the negative pressure environment, vaporization occurs. Because the vaporization of the water flow will form a steam barrier inside the pump, the steam barrier will block the flow of the internal water flow of the pump, which will cause the pump to fail to operate normally.

The purpose of the water cooling electric pump of the present invention is to improve the prior art, the water flow is caused by the negative pressure state inside the pump and the vaporization phenomenon after the heat absorption, which causes the internal water flow of the pump to be blocked due to the steam barrier, especially a kind. Through the appropriate water channel and sealing design, the pressure of the internal water flow of the pump is increased by the implementation of the creative technique, and then the evaporation temperature of the water flow is increased, and the positive pressure water flow of the pump operation output can be guided to flow through the surface of the motor casing. The heat dissipation of the motor can bring the heat generated by the operation of the motor out of the system through heat exchange, thereby improving the overall operating efficiency and life.

In order to achieve the above-mentioned creative purposes, the technical means adopted in this creation is to design a water-cooled electric pump, including: a water-cooling motor, which mainly comprises a motor outer frame body, and the motor outer frame body has an inner portion The bracket is divided to form a motor chamber and an impeller chamber. An inner casing is disposed in the motor chamber, and the inner casing includes a motor coil, a rotor and a bearing, and more than one sealing ring is disposed in the intermediate bracket. Where the inner casing is fitted, one or more sealing rings are disposed at a joint of the outer frame body and the inner casing end surface, a motor rear cover, and one or more screws for combining the motor frame and the inner casing, and One side of the rotor is provided with an axis extending to the impeller chamber, and the intermediate bracket is provided with a water guide mounting seat, and an inner ring through hole and an outer ring through hole are respectively disposed at an inner edge and an outer edge of the water guide mounting seat; The pump casing comprises a casing, a water inlet, a water inlet passage, a water outlet passage, a water outlet, and an impeller assembly chamber, and the pump casing is combined with the impeller chamber of the motor outer frame body, and Included in the impeller Between the chamber and the impeller chamber, the water inlet passage communicates with the impeller assembly chamber; and one or more impeller groups, each impeller group including an impeller and a water guide, the impeller being disposed on the motor shaft and being driven by the motor The driving rotation generates a water flow and is guided to the next impeller group via the water guide; wherein: a cooling passage is formed between the inner wall surface of the motor outer frame and the outer wall surface of the inner casing, and the impeller group is rotated. The positive pressure water flow can be forcedly flowed into the impeller chamber and the cooling passage through the inner ring through hole of the water guide mount of the intermediate bracket, and the cooling passage communicates with the outer through hole and the pump casing outside the water guide mount The water outlet channel absorbs the heat energy generated when the motor covered by the inner casing is operated, and the water flow flows out through the water outlet passage of the pump casing, thereby effectively reducing the motor temperature, improving the operation efficiency, and the water flow. The cooling system acts on the positive pressure zone, and the liquid vaporization does not occur due to the increase of the water temperature, which affects the normal operation of the pump.

The water-cooled electric pumping pump, wherein a center of a motor chamber side of the intermediate bracket is provided with a bearing chamber sleeve shaft hole and a set of cylindrical cylinders; a center of a side of the inner casing protrudes from a bearing chamber and An annular groove; the bearing chamber sleeve shaft hole and the sleeve cylinder correspondingly mount the bearing chamber and the annular groove to support the motor operation and ensure the motor shaft alignment.

The water-cooled electric pump further has a mechanical shaft seal; the center of the impeller chamber side of the intermediate bracket is provided with a mechanical shaft seal mount; the mechanical shaft is packaged on the mechanical shaft seal mount, The inner ring through hole is located between the mechanical shaft seal mounting seat and the water guide mounting seat, and the impeller chamber and the mechanical shaft seal of the motor outer frame body are in a positive pressure environment during operation to prevent water flow leakage.

The water-cooled electric pumping pump, wherein a controller chamber is formed above the motor outer frame; the controller chamber is provided with a heat conducting hole and a heat conducting plate; the heat conducting plate sealing cover covers the heat conducting hole, The heat conducting plate is connected to the cooling channel.

The technical means adopted by the present invention is a water-cooling motor, which mainly comprises a motor outer frame body. The motor outer frame body is separated by an intermediate bracket to form a motor chamber and an impeller chamber, and is arranged in the motor chamber. The utility model has an inner casing, wherein the inner casing comprises a motor coil, a rotor and a bearing, and more than one sealing ring is disposed at a joint between the intermediate bracket and the inner casing, and one or more sealing rings are disposed in the outer casing and the inner casing a joint of the end faces of the casing, a motor back cover, and one or more screws for coupling the motor frame and the inner casing, and an axial center extending to one side of the rotor to the impeller chamber, the intermediate bracket being provided The water guide mounting seat, the inner edge and the outer edge of the water guide mounting seat are respectively provided with an inner ring through hole and an outer ring through hole; a pump casing includes a casing, a water inlet, a water inlet channel, and a water outlet a passage, a water outlet, an impeller assembly chamber and a mechanical shaft sealing chamber, the pump casing is combined with the impeller chamber of the motor outer frame body, and is accommodated in the impeller assembly chamber and the impeller chamber The water inlet channel communicates with the machine a shaft sealing chamber; and one or more impeller groups, each impeller group comprising an impeller and a water guide, the impeller being disposed on the motor shaft, driven by the motor to generate a water flow, and guided to the next impeller group via the water guide; The water guide mounting seat has a set of ring faces that are sleeved and sealed with the mechanical shaft sealing chamber inner wall surface of the pump casing, and the impeller chamber communicates with the water guide seat. The outer ring through hole forms a cooling passage between the inner wall surface of the outer frame of the motor and the outer wall surface of the inner casing, and the outer ring through hole communicates with the impeller chamber and the cooling passage, and the cooling passage communicates The inner ring through hole of the water guide mounting seat and the water outlet passage of the pump casing are fitted with the mechanical shaft sealing chamber of the pump casing by the fitting ring surface of the water guide seat to isolate the suction The negative pressure water flow and the positive pressure water flow of the impeller chamber.

The advantage of this creation is that the water flow into the pump is first pressurized by the impeller group to increase the evaporation temperature of the water flow, and then the heat exchange of the motor to remove the heat generated by the motor during the pump operation, and at the same time The pump is used to pressurize the water flow to avoid the occurrence of steam barrier phenomenon, so as to improve the overall operating efficiency and life of the pump, so as to improve the prior art, the water flow is vaporized due to the negative pressure state inside the pump and the heat absorption. The lack of blockage of the internal water flow of the pump due to the steam barrier.

The present invention is a water-cooled electric pumping structure. The following describes the technical means adopted by the present invention in conjunction with the drawings and the preferred embodiment of the present invention.

Referring to FIG. 1, the water-cooled electric pump of the present invention has a water-cooling motor 10 and a pump casing 50.

Referring to FIG. 1 and FIG. 4 , the water cooling motor 10 includes a motor outer frame 11 . The motor outer frame 11 is internally separated by an intermediate bracket 12 to form a motor chamber 13 and a impeller chamber 14 . A bearing chamber sleeve shaft hole 131 is disposed on the motor chamber 13 side of the intermediate bracket 12, and a set of cylindrical cylinders 132 is formed on the outer ring of the bearing chamber sleeve shaft hole 131, and the center of the impeller chamber 14 side of the intermediate bracket 12 is formed. A mechanical shaft seal mounting seat 141 and a water guide mounting seat 142 located on the outer ring side of the mechanical shaft seal mounting seat 141 are provided, and inner rings and outer edges of the water guide mounting seat 142 of the intermediate bracket 12 are respectively provided with inner rings. The through hole 143 and the outer ring through hole 144 are located between the mechanical shaft seal mount 141 and the water guide mount 142.

Referring to FIG. 1 , FIG. 3 and FIG. 5 , the motor housing 13 of the motor outer frame 11 includes an inner casing 20 , and the inner casing 20 is sequentially provided with an intermediate bracket bearing 23 and a motor coil 21 . The shaft center 24, the rotor 22, and the rear cover bearing 25, one end of the shaft center 24 is pivotally disposed on the rear cover bearing 25, and the other end portion is pivotally disposed with the intermediate bracket bearing and is disposed to the impeller chamber 14 in the motor outer frame body 11. The center of the side of the inner casing 20 includes a protruding bearing chamber 201 and an annular groove 202. The bearing chamber 201 and the annular groove 202 and the bearing chamber are sleeved with the shaft hole 131 and the sleeve cylinder 132. Correspondingly, the water leakage is prevented by the first sealing ring 30 and the second sealing ring 31, and the outer circumferential surface of the bearing chamber sleeve shaft hole 131 is covered by the annular groove 202 of the inner casing. It is used to support the motor operation and ensure that the shaft 24 of the motor is aligned when installed.

Referring to FIG. 1 and FIG. 3, the motor rear cover 40 is coupled to the inner casing 20 by a plurality of locking screws 41, and a third sealing ring 32 is disposed between the motor rear cover 40 and the inner casing 20 to prevent The water flow leaks from the rear end of the motor, and the locking screw 41 simultaneously assembles the inner casing 20 to the motor outer frame 11 to be integrated, and the combined motor forms a cooling passage between the motor outer frame 11 and the inner casing 20. 15; The rear cover bearing 25 is mounted on the motor rear cover 40.

Please refer to FIG. 3 and FIG. 4, in view of the electronicization of the product, the application of the motor mounting controller for pumping is becoming more and more popular, and the electronic controller has a problem of heating when used, in order to further exert the water. For the benefit of cooling, a heat-conducting hole 161 is disposed in the controller chamber 16 above the outer casing 11 of the motor, and is sealed by a heat-conducting plate 17 of a heat-conducting material, and the heat-conducting plate 17 is connected to the heat-conducting hole 161. The cooling passage 15 is in contact with the water flow in the cooling passage 15, so that when the pump is running, the water flow can discharge the heat of the electronic controller by the heat conduction of the heat conducting plate 17, and further, the creation is further controlled by the controller. A pressure detecting hole 162 is provided in the chamber 16 as a pressure sensing switch interface required for motor control, and a temperature switch mount 163.

Referring to FIG. 1 and FIG. 2 , the pump casing 50 of the present invention is coupled to the motor outer frame 11 of the water cooling motor 10 to form an end of the impeller chamber 14 , and the pump casing 50 includes a casing 51 , a water inlet 52, a water inlet passage 53, a water outlet passage 54, a water outlet 55 and an impeller assembly chamber 56, the impeller assembly chamber 56 and the impeller chamber 14 in the motor outer casing 11 form an impeller running space, One or more impeller groups 60 in the impeller running space are mounted on the motor shaft 24, and the water cooling motor 10 drives the impeller group 60 to rotate to pressurize the water flow. Each impeller group includes an impeller and a water guide, and the water flows to an impeller. After the group is pressurized, the flow is directed to the next impeller group via the water deflector to continue the pressurization, and the water inlet passage 53 communicates with the impeller assembly chamber 56.

When the water-cooling electric pump is operated by the present invention, as shown in FIG. 1 and FIG. 2, the water flow will be sucked into the casing 51 from the water inlet 52, and then pressurized into the impeller group 60 via the water inlet passage 53 and finally flowed in. The impeller chamber 14 in the outer casing 11 of the motor, at which time the water flow has been pressurized by the impeller group 60, so the impeller chamber 14 is a positive pressure environment, and the positive pressure environment facilitates the operation of the mechanical shaft seal 70 because the shaft center 24 The sealing surface with the mechanical shaft seal 70 requires a small amount of water to penetrate to maintain the lubrication and sealing effect, and the positive pressure environment of the impeller chamber 14 can achieve this requirement, and the mechanical shaft seal 70 is mounted on the mechanical shaft seal mount 141. To prevent water from leaking.

Referring to FIG. 1 , FIG. 2 and FIG. 4 , the pressurized water flows through the inner ring through hole 143 provided in the impeller chamber 14 , and the pressurized water flows into the inner wall surface of the motor outer frame 11 and the inner casing 20 . The cooling passage 15 formed by the outer wall surface can simultaneously cool the surface of the inner casing 20 and the heat conducting plate 17 in the controller chamber 16 by the water flow; the water flow for completing the heat exchange flows out of the cooling passage 15 through the outer ring through hole 144. In order to enter the water outlet passage 54 of the pump casing 50, and finally exit the pump casing 50 from the water outlet 55 to complete the pressurized conveying process.

In the water-cooling electric pump of the present invention, since the cooling passage 15 and the mechanical shaft seal 70 are both disposed in the water flow region of the positive pressure, it is possible to avoid the occurrence of vaporization due to the water flow pressure being too low and the water flow temperature being increased. And the mechanical shaft seal 70 can provide better lubrication effect to ensure normal operation of the pump.

In practice, due to the need for pump inlet and outlet and impeller position configuration, the inlet passage may also be placed between the motor and the pump, and the mechanical shaft seal will be in the low pressure environment of the inlet passage.

In order to ensure that the pump of this configuration can still maintain the cooling channel of positive pressure, another embodiment of the water-cooled electric pump of the present invention is proposed. Referring to FIG. 2 and FIG. 6, the water guiding body in the outer casing 11 of the motor The central cylinder of the mounting seat 142 has a sleeved annular surface 145 which is sleeved and sealed with the inner wall surface of the mechanical shaft sealing chamber 57 on the water inlet passage 53 side of the pump casing 50 to isolate the pump. The negative pressure of the water inlet 52 and the positive pressure environment of the impeller chamber 14; the water flow of the pump is configured to be sucked into the pump casing 50 by the water inlet 52, and then pressurized into the impeller group 60 via the water inlet passage 53, and then The annular through hole 144 is disposed outside the impeller chamber 14 and enters the cooling passage 15 formed by the motor outer frame 11 and the inner casing 20, and simultaneously cools the surface of the inner casing 20 and the heat conducting plate 17 in the controller compartment 16. The water flow that completes the heat exchange flows out of the cooling passage 15 through the inner ring through hole 143 into the pump outlet passage 54, and finally flows out of the pump through the water outlet 55 to complete the pressurized conveying process.

The above-mentioned creative content and implementation manners are only preferred examples of the present invention, and any modifications made to the above embodiments in accordance with the technical essence of the present invention are still within the scope of the present technical solution.

10‧‧‧Water cooling motor
11‧‧‧Motor outer frame
12‧‧‧Intermediate bracket
13‧‧‧Motor room
131‧‧‧ Bearing housing sleeve shaft hole
132‧‧‧ fitted cylinder
14‧‧‧ impeller chamber
141‧‧‧Mechanical shaft seal mount
142‧‧‧Water guide mount
143‧‧‧ Inner ring through hole
144‧‧‧Outer ring through hole
145‧‧‧Set of torus
15‧‧‧Cooling channel
16‧‧‧Controller room
161‧‧‧thermal hole
162‧‧‧ Pressure detection hole
163‧‧‧Temperature switch mount
17‧‧‧heat conducting plate
20‧‧‧ inner casing
201‧‧‧ bearing room
202‧‧‧ annular groove
21‧‧‧Motor coil
22‧‧‧Rotor
23‧‧‧Intermediate bracket bearing
24‧‧‧Axis
25‧‧‧ Back cover bearing
30‧‧‧First seal ring
31‧‧‧Second seal ring
32‧‧‧ Third sealing ring
40‧‧‧Motor back cover
41‧‧‧Lock screw
50‧‧‧ pump housing
51‧‧‧Shell
52‧‧‧ water inlet
53‧‧‧Water inlet
54‧‧‧Water outlet
55‧‧‧Water outlet
56‧‧‧Iron assembly room
57‧‧‧Mechanical shaft sealing chamber
60‧‧‧Iron group
70‧‧‧ mechanical shaft seal

The first picture is a cross-sectional view of the water-cooled electric pump of the present creation. Figure 2 is a cross-sectional view of the pump casing of the present creation. Figure 3 is an exploded view of the components of the water cooling motor of the present invention. Figure 4 is a perspective cross-sectional view of the motor casing of the present invention. Figure 5 is a perspective view of the inner casing of the present creation. Figure 6 is a cross-sectional view of another embodiment of the water cooled electric pump of the present invention.

10‧‧‧Water cooling motor

11‧‧‧Motor outer frame

12‧‧‧Intermediate bracket

13‧‧‧Motor room

131‧‧‧ Bearing housing sleeve shaft hole

132‧‧‧ fitted cylinder

14‧‧‧ impeller chamber

141‧‧‧Mechanical shaft seal mount

142‧‧‧Water guide mount

143‧‧‧ Inner ring through hole

144‧‧‧Outer ring through hole

15‧‧‧Cooling channel

20‧‧‧ inner casing

201‧‧‧ bearing room

202‧‧‧ annular groove

21‧‧‧Motor coil

22‧‧‧Rotor

23‧‧‧Intermediate bracket bearing

24‧‧‧Axis

25‧‧‧ Back cover bearing

50‧‧‧ pump housing

51‧‧‧Shell

52‧‧‧ water inlet

53‧‧‧Water inlet

60‧‧‧Iron group

70‧‧‧ mechanical shaft seal

Claims (8)

A water-cooled electric pump includes: a water-cooling motor, which mainly includes a motor outer frame, wherein the outer frame of the motor is separated by an intermediate bracket to form a motor chamber and an impeller chamber. An inner casing is disposed in the motor housing, and the inner casing includes a motor coil, a rotor and a bearing, and more than one sealing ring is disposed at a sleeve of the intermediate bracket and the inner casing, and a sealing ring is disposed on the outer casing a motor back cover, and one or more screws for coupling the motor frame and the inner casing, and an axial center extending to the impeller chamber on the rotor side, the intermediate support A water guide mounting seat is arranged, and an inner ring through hole and an outer ring through hole are respectively disposed at an inner edge and an outer edge of the water guide mounting seat; a pump casing includes a casing, a water inlet, and a water inlet passage; a water outlet passage, a water outlet, and an impeller assembly chamber, the pump casing is combined with the impeller chamber of the motor outer frame body, and is accommodated between the impeller assembly chamber and the impeller chamber, the water inlet a passage communicating with the impeller assembly chamber; One or more impeller groups, each impeller group comprising an impeller and a water deflector, the impeller being disposed on the motor shaft, driven by the motor to generate a water flow, and guided to the next impeller group via the water deflector; characterized in that: the motor A cooling passage is formed between the inner wall surface of the outer frame and the outer wall surface of the inner casing, and the positive pressure water generated by the rotation of the impeller group can be forcedly flowed into the inner ring through hole of the water guide mount of the intermediate bracket. An impeller chamber and the cooling passage, the cooling passage is communicated with the outer through hole of the water guide mounting seat and the water outlet passage of the pump casing to absorb heat generated by the motor covered by the inner casing, and the water flow is further The pump flows out through the water outlet channel of the pump casing, which can effectively reduce the motor temperature and improve the operation efficiency, and the water flow cooling system acts on the positive pressure zone, and the liquid vaporization does not occur due to the increase of the water temperature, affecting the pump. Pu is operating normally. The water-cooled electric pump according to claim 1, wherein the center of the motor housing side of the intermediate bracket is provided with a bearing chamber sleeve shaft hole and a set of cylindrical cylinders; A bearing chamber and an annular groove are protruded; the bearing chamber sleeve shaft hole and the sleeve cylinder are correspondingly disposed with the bearing chamber and the annular groove to support the motor operation and ensure alignment of the motor shaft center. The water-cooled electric pump according to claim 2, further comprising a mechanical shaft seal; the center of the impeller chamber side of the intermediate bracket is provided with a mechanical shaft seal mount; the mechanical shaft package is disposed at a mechanical shaft seal mounting seat, wherein the inner ring through hole is located between the mechanical shaft seal mounting seat and the water guide mounting seat, and the impeller chamber and the mechanical shaft seal of the motor outer frame body are in a positive pressure environment during operation, Prevent water from leaking. The water-cooled electric pump according to claim 3, wherein a controller chamber is formed above the motor outer frame; the controller chamber is provided with a heat conducting hole and a heat conducting plate; the heat conducting plate is sealed The heat conducting hole is covered, and the heat conducting plate is connected to the cooling channel. A water-cooled electric pump includes: a water-cooling motor, which mainly includes a motor outer frame, wherein the outer frame of the motor is separated by an intermediate bracket to form a motor chamber and an impeller chamber. An inner casing is disposed in the motor housing, and the inner casing includes a motor coil, a rotor and a bearing, and more than one sealing ring is disposed at a sleeve of the intermediate bracket and the inner casing, and one or more sealing rings are disposed outside a combination of the frame body and the end surface of the inner casing, a motor back cover, and one or more screws for coupling the motor frame and the inner casing, and an axial center extending to the impeller chamber on the side of the rotor The middle bracket is provided with a water guide mounting seat, and the inner edge and the outer edge of the water guide mounting seat are respectively provided with an inner ring through hole and an outer ring through hole; a pump casing includes a casing, a water inlet and a water inlet a passage, a water outlet passage, a water outlet, an impeller assembly chamber and a mechanical shaft sealing chamber, the pump casing is combined with the impeller chamber of the motor outer frame body, and is accommodated in the impeller assembly chamber and The water inlet between the impeller chambers Cooperating with the mechanical shaft sealing chamber; and one or more impeller groups, each impeller group includes an impeller and a water guide, the impeller is disposed on the motor shaft, and is driven by the motor to generate water flow and guided to the lower portion via the water guide An impeller assembly is characterized in that: the water guide mounting seat has a set of annular surface, and the sleeve annular surface is sleeved and sealed with a mechanical shaft sealing chamber inner wall surface of the pump casing, and the impeller chamber communicates with the An outer annular through hole of the water guide mounting seat, a cooling passage is formed between the inner wall surface of the outer casing of the motor and the outer wall surface of the inner casing, and the outer annular through hole communicates with the impeller chamber and the cooling passage. The cooling passage is communicated with the inner ring through hole of the water guide mounting seat and the water outlet passage of the pump casing, and the sleeve annular surface of the water guide mounting seat is fitted with the mechanical shaft sealing chamber of the pump casing. To isolate the negative pressure water flow of the suction port from the positive pressure water flow of the impeller chamber. The water-cooled electric pump according to claim 5, wherein the center of the motor housing side of the intermediate bracket is provided with a bearing chamber sleeve shaft hole and a set of cylindrical; the side center of the inner casing A bearing chamber and an annular groove are protruded; the bearing chamber sleeve shaft hole and the sleeve cylinder are correspondingly disposed with the bearing chamber and the annular groove to support the motor operation and ensure alignment of the motor shaft center. The water-cooled electric pump according to claim 6 further has a mechanical shaft seal; the center of the impeller chamber side of the intermediate bracket is provided with a mechanical shaft seal mount, and the inner ring through hole is located at the mechanical shaft The sealing seat is mounted between the sealing seat and the water guide mounting seat; the mechanical shaft is packaged on the mechanical shaft sealing seat to prevent water leakage. The water-cooled electric pump according to claim 7, wherein a controller chamber is formed above the motor outer frame; the controller chamber is provided with a heat conducting hole and a heat conducting plate; the heat conducting plate sealing cover a heat conducting hole, the heat conducting plate is connected to the cooling channel.