Controller heat dissipation structure and shield pump

Abstract

The invention discloses a controller heat dissipation structure and a shield pump, the shield pump comprises a pump body and a motor, a pump cavity is formed in the pump body, the pump body is further provided with a liquid inlet pipeline and a liquid outlet pipeline which are communicated with the pump cavity, an output shaft of the motor is provided with an impeller, and the impeller is located in the pump cavity and is in a rotating state or a stopping state along with the output shaft of the motor. A liquid storage device communicated with the liquid outlet pipeline is arranged beside the liquid outlet pipeline, a liquid storage cavity is formed in the liquid storage device, and a liquid medium in the pump cavity can flow into the liquid storage cavity under the condition that the impeller is in a rotating state; a heat dissipation support is fixedly connected to the outer side of the liquid storage device, the heat dissipation support is fixedly connected with the controller and used for absorbing heat energy of the controller and conducting the heat energy into the liquid medium in the liquid storage cavity, and the controller is used for controlling the motor. The controller is cooled through the liquid medium in the shield pump, the cooling efficiency of the controller is improved, the operation stability of the controller is improved, and the service life of the controller is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of canned pumps, and particularly relates to a controller heat dissipation structure and a canned pump. Background Art

[0002] A canned pump is a seal-less pump used for transporting liquids. The pump body and the motor are hermetically installed. Through a shielding structure, the components inside the motor stator and rotor are isolated from the transported medium to prevent the leakage of the transported medium. At the same time, a circulating cooling channel communicating with the pump chamber is provided inside the motor, and part of the transported liquid flows through the circulating cooling channel to cool the motor.

[0003] In related technologies, the motor controller is fixedly installed on the outer side wall of the casing and dissipates heat by air. The heat dissipation efficiency is low. In the case of a relatively high ambient temperature, the too high temperature of the motor controller will seriously affect the operation stability and service life of the controller.

[0004] Therefore, it is very necessary to design a controller heat dissipation structure and a canned pump with higher cooling efficiency for the motor controller. Summary of the Invention

[0005] This application aims to solve one of the technical problems in related technologies to a certain extent. For this purpose, this application provides a controller heat dissipation structure for dissipating heat from the controller of a canned pump. The canned pump includes a pump body and a motor. A pump chamber is formed inside the pump body. An inlet pipeline and an outlet pipeline communicating with the pump chamber are further provided on the pump body. An impeller is provided on the output shaft of the motor. The impeller is located inside the pump chamber and rotates or stops following the motor output shaft. A liquid storage device communicating with the outlet pipeline is provided beside the outlet pipeline. A liquid storage chamber is formed inside the liquid storage device. The liquid medium inside the pump chamber can flow into the liquid storage chamber when the impeller is rotating. A heat dissipation bracket is fixedly connected to the outside of the liquid storage device. The heat dissipation bracket is fixedly connected to the controller. The heat dissipation bracket is used to absorb the heat energy of the controller and conduct it to the liquid medium inside the liquid storage chamber. The controller is used to control the motor.

[0006] In this technical solution, by providing a liquid storage device beside the outlet pipeline, when the motor drives the impeller to rotate, the liquid medium inside the pump chamber can enter the liquid storage device. By providing a heat dissipation bracket outside the liquid storage device and arranging the controller on the heat dissipation bracket, the heat energy generated by the controller can be conducted to the liquid storage device through the heat dissipation bracket and absorbed by the liquid medium inside the liquid storage chamber. The liquid medium inside the liquid storage chamber transfers the conducted heat energy to the liquid medium in the outlet pipeline through heat exchange, and the heat energy is absorbed by the liquid medium discharged from the pump body, thereby realizing rapid and efficient cooling of the controller, improving the operation stability of the controller and increasing the service life.

[0007] Preferably, when the impeller is in a stopped state and the liquid level in the liquid outlet pipe is lower than the highest liquid level position at the connection between the liquid storage device and the liquid outlet pipe, the liquid medium in the liquid storage chamber can flow back into the liquid outlet pipe or the pump chamber. A circulating cooling channel communicating with the pump chamber is provided in the motor of the canned motor pump. When the motor stops working and the valve of the liquid inlet pipe of the pump body is closed, due to the inevitable leakage phenomenon in the pipeline and the pump chamber, the liquid medium in the pump chamber will continuously decrease over time, the air in the motor will increase, the circulating cooling channel in the motor is usually extremely narrow, and the circulating flow rate is low. The air entering the motor is usually difficult to discharge. The reduction of the liquid medium in the motor will reduce the lubrication effect and heat dissipation effect of the liquid medium on the motor rotor, affecting the operation stability of the motor. By providing a liquid storage device on the liquid outlet pipe, when the liquid level in the pump chamber drops, the liquid medium in the liquid storage chamber can flow back into the pump chamber, increasing the total water storage capacity in the pump, and reducing the impact of pipeline leakage on the stable operation of the canned motor pump.

[0008] Preferably, the heat dissipation bracket includes a mounting portion for mounting the controller and a connecting portion for fixedly connecting with the liquid storage device. The connecting portion is formed with a mounting hole, and the liquid storage device is tightly fitted in the mounting hole.

[0009] Preferably, a mounting surface is formed on the mounting portion, the controller is abutted and connected to the mounting surface, the back surface of the mounting surface is set as a connecting surface, and the connecting surface and the connecting portion form a tightly fitting fixed connection.

[0010] Preferably, the connecting portion and the mounting portion are of an integral structure, and the heat dissipation bracket is integrally made of aluminum profiles.

[0011] Preferably, the mounting portion includes a heat exchange plate. The main planes of the heat exchange plate are respectively set as the mounting surface and the connecting surface. A plurality of liquid flow channels are provided inside the heat exchange plate, and the liquid flow channels communicate with the liquid storage chamber.

[0012] Preferably, the liquid storage device includes at least one liquid storage cylinder, and a columnar liquid storage chamber is formed in the liquid storage cylinder; The liquid storage cylinder is perpendicular to the liquid outlet pipe, or, the liquid storage cylinder is inclined downward from the bottom of the cylinder to the mouth of the cylinder, and the included angle between the central axis of the liquid storage cylinder and the horizontal plane is α, α ∈ (0, 5].

[0013] Preferably, the liquid storage cylinder is a cylindrical barrel made of stainless steel.

[0014] Second aspect, to achieve the above object, the present application further provides a canned motor pump, including a pump body and a motor. A pump chamber, a liquid inlet pipe and a liquid outlet pipe are formed on the pump body. An impeller is arranged on the output shaft of the motor. The impeller is located in the pump chamber and rotates or stops following the output shaft of the motor. The pump chamber communicates with the liquid inlet pipe and the liquid outlet pipe. The liquid outlet pipe is provided with the controller heat dissipation structure as described in any one of the above technical solutions. The reasoning process of the beneficial effects of the canned motor pump and the controller heat dissipation structure provided by the present application is similar and will not be elaborated here.

[0015] Preferably, the motor further includes a casing, a stator assembly and a shield structure. The stator assembly and the shield structure are fixedly installed in the casing. The shield structure includes a rotor assembly, a shield and a bracket cover. The shield is provided as a cylindrical structure with one end open. The bracket cover covers the opening of the shield. The rotor assembly includes a rotor and a rotating shaft. The rotor assembly is located in the shield and one end of the rotating shaft passes through the bracket cover; A plurality of flow holes communicating the pump chamber and the open side of the shield are provided on the bracket cover. An axial hole is provided along the axial direction of the rotating shaft. The axial hole communicates the pump chamber and the bottom side of the shield sleeve. The rotor is located between the bottom side and the open side of the shield sleeve. A gap is formed between the outer side wall of the rotor and the inner side wall of the shield sleeve, so that the liquid medium in the pump chamber can circulate in the shield and the rotating shaft.

[0016] These features and advantages of the present application will be disclosed in detail in the following specific embodiments and the drawings. The best embodiments or means of the present application will be shown in detail in combination with the drawings, but it is not a limitation to the technical solution of the present application. In addition, these features, elements and components appear in multiple in each of the following texts and drawings, and different symbols or numbers are marked for convenience of representation, but all represent components with the same or similar structures or functions. Description of the Drawings

[0017] The present application will be further described below with reference to the drawings: Figure 1 is the canned motor pump of the embodiment of the present application; Figure 2 is the sectional view of the canned motor pump of the embodiment of the present application; Figure 3 is the exploded view of the controller heat dissipation structure of the embodiment of the present application; Figure 4 is the bottom view of the controller heat dissipation structure of the embodiment of the present application; Figure 5 is Figure 4 the A-A sectional view of Figure 6Internal structure cross-sectional view of the motor according to the embodiment of the present application.

[0018] Description of reference numerals: Among them, 100 is the pump body; 110 is the pump chamber; 120 is the liquid inlet pipe; 130 is the liquid outlet pipe; 200 is the motor; 210 is the impeller; 220 is the motor housing; 230 is the stator assembly; 240 is the shield structure; 241 is the rotor assembly; 2411 is the rotating shaft; 2412 is the rotor; 2413 is the shaft hole; 242 is the shield; 243 is the bracket cover; 2431 is the overflow hole; 310 is the liquid storage device; 311 is the liquid storage chamber; 320 is the heat dissipation bracket; 321 is the mounting part; 3211 is the mounting surface; 3212 is the connection surface; 3213 is the liquid flow channel; 322 is the connection part; 3221 is the mounting hole; 330 is the cover body; 340 is the controller. Detailed implementation manners

[0019] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. Based on the embodiments in the implementation manners, it is intended to explain the present application and should not be construed as a limitation to the present application.

[0020] As used herein, the phrase "one embodiment" or "example" or "instance" means that the specific features, structures, or characteristics described in connection with the embodiment itself may be included in at least one embodiment of the present disclosure. The appearance of the phrase "in one embodiment" at various positions in the specification does not necessarily refer to the same embodiment.

[0021] A canned motor pump is a seal-less pump for transporting liquids. The pump body 100 and the motor 200 are hermetically installed. The motor stator assembly 230 is isolated from the rotor assembly 241 and the transported medium through a shielding structure to prevent the leakage of the transported medium. At the same time, by setting a circulating cooling channel, the transported liquid medium can flow into the rotor assembly 241 to cool the motor 200 and lubricate the rotor 2412. The controller 340 of the motor 200 is arranged outside the motor housing 220 of the motor 200, and the controller 340 is cooled by natural air cooling. In the case of a relatively high ambient temperature, the naturally cooled controller 340 may affect the operation stability and service life of the controller 340 due to excessive temperature.

[0022] In addition, a circulating cooling channel communicating with the pump chamber 110 is provided in the motor 200 of the canned motor pump. When the motor 200 stops working and the valve of the liquid inlet pipe 120 of the pump body 100 is closed, due to the inevitable leakage phenomenon in the pipeline, the liquid medium in the pump chamber 110 will continuously decrease over time, the air in the motor 200 will increase, the circulating cooling channel in the motor 200 is usually extremely narrow, and the circulating flow rate is low. The air entering the motor 200 is usually difficult to discharge. The reduction of the liquid medium in the motor 200 will reduce the lubrication effect and heat dissipation effect of the liquid medium on the rotor 2412 of the motor 200, affecting the operation stability of the motor 200. In view of this, the researchers of this application have innovated a heat dissipation structure for the controller 340 that cools the controller 340 by arranging a liquid storage device 310 beside the liquid outlet pipe 130. At the same time, through the liquid storage device 310, when the liquid level in the pump chamber 110 drops, the liquid medium in the liquid storage device 310 can flow back into the pump chamber 110 to prevent too much air in the motor 200 from causing failures.

[0023] As Figures 1 to 3 shown, a heat dissipation structure for the controller 340 is used to dissipate heat from the controller 340 of the canned motor pump. The canned motor pump includes a pump body 100 and a motor 200. A pump chamber 110 is formed in the pump body 100. The pump body 100 is further provided with a liquid inlet pipe 120 and a liquid outlet pipe 130 communicating with the pump chamber 110. An impeller 210 is arranged on the output shaft of the motor 200. The impeller 210 is located in the pump chamber 110 and rotates or stops following the output shaft of the motor 200. A liquid storage device 310 communicating with the liquid outlet pipe 130 is arranged beside the liquid outlet pipe 130. A liquid storage chamber 311 is formed in the liquid storage device 310. The liquid medium in the pump chamber 110 can flow into the liquid storage chamber 311 when the impeller 210 is in a rotating state; a heat dissipation bracket 320 is fixedly connected to the outside of the liquid storage device 310. The heat dissipation bracket 320 is fixedly connected to the controller 340. The heat dissipation bracket 320 is used to absorb the heat energy of the controller 340 and conduct it to the liquid medium in the liquid storage chamber 311. The controller 340 is used to control the motor 200. The canned motor pump provides driving force by driving the impeller 210 to rotate by the motor 200 to drive the liquid medium in the pump chamber 110 to flow towards the liquid outlet pipe 130. When the liquid medium flows rapidly in the liquid outlet pipe 130, it is inevitable that a small amount of liquid medium will flow into the liquid storage chamber 311 communicating beside the liquid outlet pipe 130, thereby gradually filling the liquid storage chamber 311. The liquid medium in the liquid storage chamber 311 can quickly conduct the heat absorbed by the heat dissipation bracket 320 to the liquid medium in the liquid outlet pipe 130, and then be discharged from the canned motor pump with the liquid medium, realizing efficient heat transfer.

[0024] In this technical solution, by arranging a liquid storage device 310 beside the liquid outlet pipe 130, when the motor 200 drives the impeller 210 to rotate, the liquid medium in the pump chamber 110 can enter the liquid storage device 310. By arranging a heat dissipation bracket 320 outside the liquid storage device 310 and setting the controller 340 on the heat dissipation bracket 320, the heat energy generated by the controller 340 can be conducted to the liquid storage device 310 through the heat dissipation bracket 320 and absorbed by the liquid medium in the liquid storage chamber 311. The liquid medium in the liquid storage chamber 311 transfers the heat energy to the liquid medium in the liquid outlet pipe 130 through heat exchange, and the liquid medium discharged from the pump body 100 absorbs the heat energy, thereby realizing rapid and efficient cooling of the controller 340, further improving the operation stability of the controller 340 and increasing its service life.

[0025] In some embodiments, as Figure 2 shown, when the impeller 210 is in a stopped state and the liquid level in the liquid outlet pipe 130 is lower than the highest liquid level position at the connection between the liquid storage device 310 and the liquid outlet pipe 130, the liquid medium in the liquid storage chamber 311 can flow back to the liquid outlet pipe 130 or the pump chamber 110. A circulating cooling channel communicating with the pump chamber 110 is arranged in the motor 200 of the canned motor pump. When the motor 200 stops working and the valve of the liquid inlet pipe 120 of the pump body 100 is closed, due to the inevitable leakage phenomenon in the pipeline and the pump chamber, the liquid medium in the pump chamber 110 will continuously decrease over time, the air in the motor 200 will increase, the circulating cooling channel in the motor 200 is usually extremely narrow, and the circulating flow rate is low. The air entering the motor 200 is usually difficult to discharge. The reduction of the liquid medium in the motor 200 will reduce the lubrication effect and heat dissipation effect of the liquid medium on the rotor 2412 of the motor 200, affecting the operation stability of the motor 200. By arranging the liquid storage device 310 on the liquid outlet pipe 130, when the liquid level in the pump chamber 110 drops, the liquid medium in the liquid storage chamber 311 can flow back to the pump chamber 110, increasing the total water storage capacity in the pump, and reducing the influence of pipeline leakage on the stable operation of the canned motor pump.

[0026] In some embodiments, as Figure 3 、 4As shown, the heat dissipation bracket 320 includes a mounting portion 321 for mounting the controller 340 and a connecting portion 322 for fixedly connecting with the liquid storage device 310. The connecting portion 322 is formed with a mounting hole 3221, and the liquid storage device 310 is tightly fitted and sleeved in the mounting hole 3221. The mounting portion 321 is used for mounting the controller 340 and quickly absorbing the heat generated by the controller 340. The connecting portion 322 is tightly fitted and connected with the liquid storage device 310, which is used for fixedly connecting the liquid storage device 310 and the mounting portion 321 and conducting heat between the mounting portion 321 and the liquid storage device 310. By setting the outer side walls of the heat dissipation bracket 320 and the liquid storage device 310 as fixed metal materials with high heat conduction efficiency, the heat dissipation efficiency of the controller 340 can be greatly improved.

[0027] Specifically, as Figure 3 shown, a mounting surface 3211 is formed on the mounting portion 321, the controller 340 is abutted and connected to the mounting surface 3211, the back surface of the mounting surface 3211 is set as a connecting surface 3212, and the connecting surface 3212 forms a tightly fitting and fixed connection with the connecting portion 322. In the above implementation manner, the mounting portion 321 and the connecting portion 322 of the heat dissipation bracket 320 are set as a split structure and are fixedly connected by screws. The controller 340 is set as a circuit board including a plurality of heating elements, and the circuit board is mounted on the mounting surface 3211 of the mounting portion 321. In some embodiments, the heat conduction efficiency can also be improved by setting a heat conductive insulating material such as heat conductive silicone between the circuit board and the mounting surface 3211. In other embodiments, the connecting portion 322 and the mounting portion 321 can also be set as an integral structure. For example, the heat dissipation bracket 320 is integrally formed by aluminum alloy casting. During use, the liquid storage device 310 is inserted into the mounting hole 3221 to form a stable fixed connection, and then the controller 340 is mounted on the mounting surface 3211 of the heat dissipation bracket 320, thus realizing the installation of the heat conduction structure from the controller 340 to the liquid storage device 310.

[0028] In some embodiments, as Figure 5 shown, the mounting portion 321 includes a heat exchange plate, the main planes of the heat exchange plate are respectively set as the mounting surface 3211 and the connecting surface 3212, and a plurality of liquid flow channels 3213 are arranged inside the heat exchange plate, and the liquid flow channels 3213 communicate with the liquid storage cavity 311. In this implementation manner, the mounting portion 321 of the heat dissipation bracket 320 is set as a heat exchange plate with liquid flow channels 3213 inside, which further increases the contact area between the heat dissipation bracket 320 and the liquid medium in the liquid storage device 310, thereby further improving the heat dissipation performance of the heat dissipation bracket 320 and the liquid storage device 310.

[0029] Specifically, as Figure 3As shown, the liquid storage device 310 includes a liquid storage cylinder, and a columnar liquid storage cavity 311 is formed inside the liquid storage cylinder. In other embodiments, the liquid storage device 310 may also be provided as a plurality of interconnected liquid storage cylinders. Accordingly, a plurality of mounting holes 3221 matching the liquid storage device 310 are correspondingly provided on the connecting portion 322 of the heat dissipation bracket 320. By providing a plurality of interconnected liquid storage cylinders, the storage capacity of the liquid medium in the liquid storage device 310 can be increased, thereby improving the heat absorption capacity of the liquid storage device 310 and extending the time for air to enter the motor 200 to a greater extent (when the canned motor pump stops working).

[0030] In some embodiments, as Figure 2 shown, the liquid storage cylinder is vertically arranged with the liquid outlet pipe 130. Arranging the liquid storage cylinder vertically with the liquid outlet pipe 130 can facilitate the installation of the liquid storage device 310 and the heat dissipation bracket 320, making the overall structure of the canned motor pump more compact. In other embodiments, the liquid storage cylinder may also be arranged to incline downward from the bottom of the cylinder to the mouth of the cylinder, and the central axis of the liquid storage cylinder forms an angle α with the horizontal plane, where α ∈ (0, 5]. That is, by arranging the liquid storage cylinder with the mouth of the cylinder inclining downward, it is convenient for the cooling medium to enter and flow out of the liquid storage cavity 311. As a specific implementation manner, the liquid storage cylinder is made of a stainless steel cylinder.

[0031] Second, to achieve the above object, as Figure 1 、 2 shown, the present embodiment further provides a canned motor pump, which includes a pump body 100 and a motor 200. A pump cavity 110, a liquid inlet pipe 120, and a liquid outlet pipe 130 are formed on the pump body 100. An impeller 210 is arranged on the output shaft of the motor 200. The impeller 210 is located in the pump cavity 110 and rotates or stops following the output shaft of the motor 200. The pump cavity 110 communicates with the liquid inlet pipe 120 and the liquid outlet pipe 130. The liquid outlet pipe 130 is provided with a controller 340 heat dissipation structure as described in any one of the above technical solutions. The reasoning process of the beneficial effects of the canned motor pump provided in this application and the controller 340 heat dissipation structure is similar and will not be elaborated here.

[0032] Specifically, as Figure 6As shown, the motor 200 includes a housing 220, a stator assembly 230, and a shield structure 240. The stator assembly 230 and the shield structure 240 are fixedly installed in the housing 220. The shield structure 240 includes a rotor assembly 241, a shield 242, and a bracket cover 243. The shield 242 is provided as a cylindrical structure with one end open. The bracket cover 243 is disposed at the opening of the shield 242. The rotor assembly 241 includes a rotor 2412 and a rotating shaft 2411. The rotor assembly 241 is located inside the shield 242 and one end of the rotating shaft 2411 passes through the bracket cover 243. A plurality of flow holes 2431 communicating the pump chamber 110 and the opening side of the shield 242 are provided on the bracket cover 243. An axial hole 2413 is provided in the rotating shaft 2411 along the axial direction. The axial hole 2413 communicates the pump chamber 110 and the bottom side of the shield 242. The rotor 2412 is located between the bottom side and the opening side of the shield 242. A gap is formed between the outer side wall of the rotor 2412 and the inner side wall of the shield 242, so that the liquid medium in the pump chamber 110 can circulate inside the shield 242 and the rotating shaft 2411. In this embodiment, a liquid medium circulation channel as shown by the arrow is formed inside the canned motor 200. The rotor assembly 241 inside the motor 200 is lubricated and cooled by the liquid medium, making the operating state of the motor 200 more stable. However, when the canned pump stops running, the liquid medium in the pump chamber 110 and the motor 200 will continuously decrease due to pipeline leakage. Therefore, in this embodiment, when the liquid level in the pump chamber 110 drops, the liquid medium in the liquid storage chamber 311 flows back into the pump chamber 110 and the motor 200, delaying the drop speed of the liquid level of the liquid medium in the motor 200 and preventing a large amount of air from entering the inside of the motor 200, which may cause an increase in the friction force during the operation of the motor 200 and a decrease in the cooling effect.

[0033] In summary, in this embodiment, the heat dissipation structure of the controller 340 is designed into the cooling circulation channel of the canned motor 200, and the liquid cooling medium flowing inside the motor 200 is used to cool the controller 340 of the motor 200, improving the heat dissipation efficiency of the controller 340 of the motor 200, and further improving the operating stability and service life of the motor 200. The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Those skilled in the art should understand that the present application includes but is not limited to the content described in the drawings and the above specific implementation manner. Any modification that does not deviate from the functional and structural principles of the present application will be included in the scope of the claims.

Claims

1. A controller heat dissipation structure for dissipating heat from the controller (340) of a canned motor pump. The canned motor pump includes a pump body (100) and a motor (200). A pump chamber (110) is formed in the pump body (100). An inlet pipeline (120) and an outlet pipeline (130) communicating with the pump chamber (110) are further provided on the pump body (100). An impeller (210) is provided on the output shaft of the motor (200). The impeller (210) is located in the pump chamber (110) and rotates or stops following the output shaft of the motor (200). It is characterized in that, A liquid storage device (310) communicating with the liquid outlet pipe (130) is arranged beside the liquid outlet pipe (130). A liquid storage cavity (311) is formed in the liquid storage device (310). The liquid medium in the pump cavity (110) can flow into the liquid storage cavity (311) when the impeller (210) is in a rotating state. A heat dissipation bracket (320) is fixedly connected to the outside of the liquid storage device (310). The heat dissipation bracket (320) is fixedly connected to a controller (340). The heat dissipation bracket (320) is used to absorb the heat energy of the controller (340) and conduct it to the liquid medium in the liquid storage cavity (311). The controller (340) is used to control the motor (200).

2. The controller heat dissipation structure according to claim 1, characterized in that, When the impeller (210) is in a stopped state and the liquid level in the liquid outlet pipe (130) is lower than the highest liquid level position at the connection between the liquid storage device (310) and the liquid outlet pipe (130), the liquid medium in the liquid storage cavity (311) can flow back into the liquid outlet pipe (130) or the pump cavity (110).

3. The controller heat dissipation structure according to claim 1, wherein The heat dissipation bracket (320) includes a mounting part (321) for mounting the controller (340) and a connecting part (322) for fixedly connecting with the liquid storage device (310). The connecting part (322) is formed with a mounting hole (3221), and the liquid storage device (310) is tightly fitted in the mounting hole (3221).

4. The controller heat dissipation structure according to claim 3, wherein, A mounting surface (3211) is formed on the mounting part (321). The controller (340) is abutted and connected to the mounting surface (3211). The back surface of the mounting surface (3211) is a connecting surface (3212), and the connecting surface (3212) and the connecting part (322) form a tightly fitting fixed connection.

5. The controller heat dissipation structure according to claim 3, wherein, The connecting part (322) and the mounting part (321) are of an integral structure, and the heat dissipation bracket (320) is made of an aluminum profile as a whole.

6. The controller heat dissipation structure according to claim 4, wherein The mounting part (321) includes a heat exchange plate. The main planes of the heat exchange plate are respectively the mounting surface (3211) and the connecting surface (3212). A plurality of liquid flow channels (3213) are arranged inside the heat exchange plate, and the liquid flow channels (3213) communicate with the liquid storage cavity (311).

7. The controller heat dissipation structure according to any one of claims 1 to 6, characterized in that, The liquid storage device (310) includes at least one liquid storage cylinder, and a columnar liquid storage cavity (311) is formed in the liquid storage cylinder. The liquid storage cylinder is perpendicular to the liquid outlet pipe (130). Or, the liquid storage cylinder is inclined downward from the bottom of the cylinder to the mouth of the cylinder, and the included angle between the central axis of the liquid storage cylinder and the horizontal plane is α, where α ∈ (0, 5].

8. The controller heat dissipation structure according to claim 7, characterized in that, A cover body (330) is further arranged above the heat dissipation bracket (320). The cover body (330) is hermetically connected to the heat dissipation bracket (320) to form a sealed cavity, and the controller (340) is located in the sealed cavity.

9. A canned motor pump, comprising a pump body (100) and a motor (200), characterized in that, A pump chamber (110), a liquid inlet pipe (120) and a liquid outlet pipe (130) are formed on the pump body (100). An impeller (210) is arranged on the output shaft of the motor (200). The impeller (210) is located in the pump chamber (110) and rotates or stops following the output shaft of the motor (200). The pump chamber (110) communicates with the liquid inlet pipe (120) and the liquid outlet pipe (130). The liquid outlet pipe (130) is provided with a controller heat dissipation structure as described in any one of claims 1 to 8.

10. The canned motor pump according to claim 9, wherein The motor (200) further includes a housing (220), a stator assembly (230) and a shield sleeve structure (240). The stator assembly (230) and the shield sleeve structure (240) are fixedly installed in the housing (220). The shield sleeve structure (240) includes a rotor assembly (241), a shield sleeve (242) and a bracket cover (243). The shield sleeve (242) is provided as a cylindrical structure with one end open. The bracket cover (243) is covered on the opening of the shield sleeve (242). The rotor assembly (241) includes a rotor (2412) and a rotating shaft (2411). The rotor assembly (241) is located in the shield sleeve (242) and one end of the rotating shaft (2411) passes through the bracket cover (243); A plurality of flow holes (2431) communicating the pump chamber (110) and the opening side of the shield sleeve (242) are provided on the bracket cover (243). An axial hole (2413) is provided in the rotating shaft (2411) in the axial direction. The axial hole (2413) communicates the pump chamber (110) and the bottom side of the shield sleeve (242). The rotor (2412) is located between the bottom side and the opening side of the shield sleeve (242). A gap is formed between the outer side wall of the rotor (2412) and the inner side wall of the shield sleeve (242) so that the liquid medium in the pump chamber (110) can circulate in the shield sleeve (242) and the rotating shaft (2411).

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