Controller heat dissipation structure and shielded pump

Abstract

The present invention discloses a controller heat dissipation structure and a shielded pump. The shielded pump includes a pump body and a motor. The pump body defines a pump cavity. The pump body is further provided with a liquid inlet pipe and a liquid outlet pipe communicating with the pump cavity. The motor output shaft is provided with an impeller. The impeller is located within the pump cavity and rotates or stops with the motor output shaft. A liquid storage device is provided adjacent to the liquid outlet pipe and communicates with the liquid outlet pipe. The liquid storage device defines a liquid storage cavity. Liquid medium within the pump cavity can flow into the liquid storage cavity 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 a controller. The heat dissipation bracket is configured to absorb heat energy from the controller and transfer it to the liquid medium within the liquid storage cavity. The controller is configured to control the motor. Heat dissipation from the controller is achieved through the liquid medium within the shielded pump, thereby improving the controller's cooling efficiency, thereby enhancing the controller's operational stability, and extending its service life.

Description

Technical Field

[0001] The present application relates to the technical field of shielded pumps, and in particular to a controller heat dissipation structure and a shielded pump. Background Art

[0002] A shielded pump is a sealless pump used to transport liquids. The pump body and motor are sealed and installed. The shielding structure isolates the components inside the motor stator and rotor from the conveying medium to prevent leakage of the conveying medium. At the same time, a circulating cooling channel connected to the pump cavity is provided in the motor, and part of the conveyed liquid flows through the circulating cooling channel to cool the motor.

[0003] In the related art, the motor controller is fixedly installed on the outer wall of the casing and uses air cooling, which has low heat dissipation efficiency. When the ambient temperature is high, the temperature of the motor controller is too high, which will seriously affect the operating stability and service life of the controller.

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

[0005] The present application aims to solve one of the technical problems in the related art to a certain extent. To this end, the present application provides a controller heat dissipation structure for dissipating heat from the controller of a shielded pump, wherein the shielded pump comprises a pump body and a motor, wherein a pump cavity is formed in the pump body, and a liquid inlet pipe and a liquid outlet pipe communicating with the pump cavity are further provided on the pump body, and an impeller is provided on the output shaft of the motor, wherein the impeller is located in the pump cavity and rotates or stops with the output shaft of the motor, and a liquid storage device communicating with the liquid outlet pipe is provided beside the liquid outlet pipe, wherein a liquid storage cavity is formed in the liquid storage device, and the liquid medium in the pump cavity can flow into the liquid storage cavity when the impeller is in a rotating state;

[0006] A heat dissipation bracket is fixedly connected to the outside of the liquid storage device, and the heat dissipation bracket is fixedly connected to a controller. The heat dissipation bracket is used to absorb the heat energy of the controller and conduct it to the liquid medium in the liquid storage chamber. The controller is used to control the motor.

[0007] In this technical solution, a liquid storage device is arranged beside the liquid outlet pipe, so that when the motor drives the impeller to rotate, the liquid medium in the pump chamber can enter the liquid storage device. A heat dissipation bracket is arranged on the outside of the liquid storage device, and the controller is arranged on the heat dissipation bracket, so that 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 in the liquid storage chamber. The liquid medium in the liquid storage chamber will be conducted to the liquid medium in the liquid outlet pipe through heat exchange, and the heat energy will be absorbed by the liquid medium discharged from the pump body, thereby realizing rapid and efficient cooling of the controller, thereby improving the operating stability of the controller and increasing its service life.

[0008] 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 to the liquid outlet pipe or the pump chamber. A circulating cooling channel connected to the pump chamber is provided in the motor of the shielded 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 in the pipe and the pump chamber, the liquid medium in the pump chamber will continue to decrease over time, and the air in the motor will increase. The circulating cooling channel in the motor is usually very narrow and the circulation 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 and heat dissipation effect of the liquid medium on the motor rotor, affecting the running 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 to the pump chamber, increasing the total water storage capacity in the pump space and reducing the impact of pipeline leakage on the stable operation of the shielded pump.

[0009] Preferably, the heat dissipation bracket includes a mounting portion for mounting the controller and a connecting portion for fixedly connecting to the liquid storage device, the connecting portion is formed with a mounting hole, and the liquid storage device is tightly fitted into the mounting hole.

[0010] Preferably, a mounting surface is formed on the mounting portion, the controller is abutted and connected to the mounting surface, the back side of the mounting surface is set as a connecting surface, and the connecting surface forms a tightly fitting fixed connection with the connecting portion.

[0011] Preferably, the connecting portion and the mounting portion are configured as an integrated structure, and the heat dissipation bracket is made entirely of aluminum profiles.

[0012] 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 connection surface, and a plurality of liquid flow channels are provided inside the heat exchange plate, and the liquid flow channels are connected to the liquid storage cavity.

[0013] Preferably, the liquid storage device includes at least one liquid storage cylinder, and a columnar liquid storage cavity is formed in the liquid storage cylinder;

[0014] The liquid storage cylinder and the liquid outlet pipe are arranged vertically.

[0015] Alternatively, the liquid storage cylinder is tilted downward from the bottom of the cylinder to the cylinder mouth, and the angle between the central axis of the liquid storage cylinder and the horizontal plane is α, α∈(0, 5].

[0016] Preferably, the liquid storage cylinder is configured as a cylinder made of stainless steel.

[0017] In a second aspect, to achieve the above-mentioned objectives, the present application further provides a shielded pump, comprising a pump body and a motor, wherein the pump body is formed with a pump chamber, a liquid inlet pipe, and a liquid outlet pipe, an impeller is provided 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 is connected to the liquid inlet pipe and the liquid outlet pipe, and the liquid outlet pipe is provided with a controller heat dissipation structure as described in any of the above-mentioned technical solutions. The reasoning process for the beneficial effects of the shielded pump and the controller heat dissipation structure provided in this application is similar and will not be repeated here.

[0018] Preferably, the motor further comprises a casing, a stator assembly and a shielding sleeve structure, wherein the stator assembly and the shielding sleeve structure are fixedly mounted in the casing, the shielding sleeve structure comprises a rotor assembly, a shielding sleeve and a bracket cover, the shielding sleeve is configured as a cylindrical structure with one end open, the bracket cover is disposed at the opening of the shielding sleeve, the rotor assembly comprises a rotor and a rotating shaft, the rotor assembly is located in the shielding sleeve and one end of the rotating shaft passes through the bracket cover;

[0019] The bracket cover is provided with a plurality of flow holes connecting the pump chamber and the opening side of the shielding sleeve. The rotating shaft is provided with an axial hole along the axial direction. The axial hole connects the pump chamber and the bottom side of the shielding sleeve. The rotor is located between the bottom side and the opening side of the shielding sleeve. A gap is formed between the outer wall of the rotor and the inner wall of the shielding sleeve so that the liquid medium in the pump chamber can circulate in the shielding sleeve and the rotating shaft.

[0020] These features and advantages of this application will be disclosed in detail in the following detailed description and accompanying drawings. The best embodiments or means of this application will be fully illustrated in conjunction with the accompanying drawings, but this does not limit the technical solutions of this application. Furthermore, although there may be multiple features, elements, and components in each of the following text and accompanying drawings, different symbols or numbers may be used for convenience, but all represent components with the same or similar structure or function. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present application will be further described below with reference to the accompanying drawings:

[0022] Figure 1 A canned motor pump according to an embodiment of the present application;

[0023] Figure 2 This is a schematic cross-sectional view of a canned motor pump according to an embodiment of the present application;

[0024] Figure 3 This is an exploded diagram of the heat dissipation structure of the controller according to an embodiment of the present application;

[0025] Figure 4 A bottom view of the controller heat dissipation structure according to an embodiment of the present application;

[0026] Figure 5 for Figure 4 AA section view;

[0027] Figure 6 This is a cross-sectional view of the internal structure of the motor according to an embodiment of the present application.

[0028] Description of reference numerals:

[0029] Among them, 100, pump body; 110, pump chamber; 120, liquid inlet pipe; 130, liquid outlet pipe; 200, motor; 210, impeller; 220, casing; 230, stator assembly; 240, shielding sleeve structure; 241, rotor assembly; 2411, rotating shaft; 2412, rotor; 2413, shaft hole; 242, shielding sleeve; 243, bracket cover; 2431, flow hole; 310, liquid storage device; 311, liquid storage chamber; 320, heat dissipation bracket; 321, mounting portion; 3211, mounting surface; 3212, connecting surface; 3213, liquid flow channel; 322, connecting portion; 3221, mounting hole; 330, cover body; 340, controller. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described in the embodiments are intended to be used to explain the present application and are not to be construed as limiting the present application.

[0031] References in this specification to "one embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment itself can be included in at least one embodiment disclosed herein. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

[0032] A shielded pump is a sealless pump used to transport liquids. The pump body 100 and the motor 200 are sealed and installed. The shielding structure isolates the motor stator assembly 230 from the rotor assembly 241 and the transporting medium to prevent leakage of the transporting medium. At the same time, a circulating cooling channel is set up to allow the transported liquid medium to flow into the rotor assembly 241 to cool the motor 200 and lubricate the rotor 2412. The controller 340 of the motor 200 is set outside the casing 220 of the motor 200, and the controller 340 is cooled by natural air heat dissipation. When the ambient temperature is high, the naturally cooled controller 340 will affect the operating stability and service life of the controller 340 due to excessively high temperature.

[0033] In addition, the motor 200 of the shielded pump is provided with a circulating cooling channel connected to the pump chamber 110. 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 in the pipe, the liquid medium in the pump chamber 110 will continue to decrease over time, and the air in the motor 200 will increase. The circulating cooling channel in the motor 200 is usually very narrow and the circulation 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 operating stability of the motor 200. In view of this, the researchers of this application have innovated a heat dissipation structure of the controller 340 in which a liquid storage device 310 is provided next to the liquid outlet pipe 130 to cool the controller 340. At the same time, the liquid storage device 310 can make the liquid medium in the liquid storage device 310 flow back to the pump chamber 110 when the liquid level in the pump chamber 110 drops, preventing the motor 200 from malfunctioning due to excessive air.

[0034] like Figures 1 to 3 As shown, a controller 340 heat dissipation structure is used to dissipate heat from the controller 340 of the shielded pump. The shielded pump includes a pump body 100 and a motor 200. A pump cavity 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 connected to the pump cavity 110. An impeller 210 is provided on the output shaft of the motor 200. The impeller 210 is located in the pump cavity 110 and follows the output shaft of the motor 200 in a rotating state or a stopped state. The side of the liquid outlet pipe 130 is provided with a liquid outlet pipe 120 connected to the liquid outlet pipe 130. The pipeline 130 is connected to a liquid storage device 310, and 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, and 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 shielded pump provides driving force by driving the impeller 210 to rotate through the motor 200 to drive the liquid medium in the pump chamber 110 to flow to the liquid outlet pipe 130. When the liquid medium flows rapidly in the liquid outlet pipe 130, a small amount of liquid medium will inevitably flow into the liquid storage chamber 311 connected to the side of the liquid outlet pipe 130, thereby gradually filling the liquid storage chamber 311. After absorbing the heat from the heat dissipation bracket 320, the liquid medium in the liquid storage chamber 311 can be quickly transferred to the liquid medium in the liquid outlet pipe 130, and then discharged from the shielded pump along with the liquid medium, thereby achieving efficient heat transfer.

[0035] In the present technical solution, a liquid storage device 310 is provided beside the liquid outlet pipe 130, so that 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. A heat dissipation bracket 320 is provided on the outside of the liquid storage device 310, and the controller 340 is provided on the heat dissipation bracket 320, so that 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 is conducted to the liquid medium in the liquid outlet pipe 130 through heat exchange, and the heat energy is absorbed by the liquid medium discharged from the pump body 100, thereby realizing rapid and efficient cooling of the controller 340, thereby improving the operating stability of the controller 340 and increasing the service life.

[0036] In some embodiments, as Figure 2 As 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 point 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 connected to the pump chamber 110 is provided in the motor 200 of the shielded 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 inevitable leakage in the pipe and the pump chamber, the liquid medium in the pump chamber 110 will continue to decrease over time, and the air in the motor 200 will increase. The circulating cooling channel in the motor 200 is usually extremely narrow and the circulation 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 and heat dissipation effect of the liquid medium on the rotor 2412 of the motor 200, affecting the operating stability of the motor 200. By providing a 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, thereby increasing the total water storage capacity of the space in the pump and reducing the impact of pipeline leakage on the stable operation of the shielded pump.

[0037] 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 to 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 into the mounting hole 3221. The mounting portion 321 is used to mount the controller 340 and to quickly absorb the heat generated by the controller 340. The connecting portion 322 is tightly fitted with the liquid storage device 310 and is connected to the liquid storage device 310 for fixed connection between the liquid storage device 310 and the mounting portion 321 and for heat conduction 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 to a fixed metal material with high thermal conductivity, the heat dissipation efficiency of the controller 340 can be greatly improved.

[0038] Specifically, such as Figure 3 As shown, a mounting surface 3211 is formed on the mounting portion 321, and the controller 340 is abutted against the mounting surface 3211. The back of the mounting surface 3211 is set as a connecting surface 3212, and the connecting surface 3212 forms a tightly fitting fixed connection with the connecting portion 322. In the above implementation, the mounting portion 321 and the connecting portion 322 of the heat dissipation bracket 320 are set as a split structure and 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 thermally conductive insulating material such as thermally conductive silicone between the circuit board and the mounting surface 3211. In other embodiments, the connecting portion 322 and the mounting portion 321 may also be configured as an integrated structure. For example, the heat dissipation bracket 320 may be integrally formed by casting aluminum alloy. When in 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, thereby realizing the installation of a heat conduction structure from the controller 340 to the liquid storage device 310.

[0039] In some embodiments, as Figure 5 As shown, the mounting portion 321 includes a heat exchange plate, the main surfaces of which are respectively configured as the mounting surface 3211 and the connection surface 3212. The heat exchange plate is internally provided with a plurality of liquid flow channels 3213, which communicate with the liquid storage chamber 311. In this implementation, the mounting portion 321 of the heat dissipation bracket 320 is configured as a heat exchange plate having internal liquid flow channels 3213, further increasing 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.

[0040] Specifically, such as Figure 3As shown, the liquid storage device 310 includes a liquid storage cylinder, and a columnar liquid storage cavity 311 is formed in the liquid storage cylinder. In other embodiments, the liquid storage device 310 can also be set as a plurality of interconnected liquid storage cylinders, and the connecting portion 322 of the heat dissipation bracket 320 is correspondingly provided with a plurality of mounting holes 3221 that cooperate with the liquid storage device 310. 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 can extend the time for air to enter the motor 200 to a greater extent (when the shielded pump stops working).

[0041] In some embodiments, as Figure 2 As shown, the liquid storage cylinder is arranged perpendicularly to the liquid outlet pipe 130. The arrangement of the liquid storage cylinder and the liquid outlet pipe 130 perpendicularly can facilitate the installation of the liquid storage device 310 and the heat dissipation bracket 320, making the overall structure of the shielded pump more compact. In other embodiments, the liquid storage cylinder can also be arranged to tilt downward from the bottom of the cylinder to the cylinder mouth, and the angle between the central axis of the liquid storage cylinder and the horizontal plane is α, α∈(0, 5]. That is, by arranging the liquid storage cylinder with the cylinder mouth tilted downward, it is possible to facilitate the cooling medium to enter the liquid storage chamber 311 and flow out of the liquid storage chamber 311. As a specific implementation method, the liquid storage cylinder is set as a cylinder made of stainless steel.

[0042] Secondly, to achieve the above objectives, Figure 1 、 2 As shown, this embodiment also provides a shielded pump, including a pump body 100 and a motor 200, wherein the pump body 100 is formed with a pump chamber 110, a liquid inlet pipe 120, and a liquid outlet pipe 130, and an impeller 210 is provided on the output shaft of the motor 200, wherein the impeller 210 is located in the pump chamber 110 and follows the output shaft of the motor 200 in a rotating state or a stopped state, and the pump chamber 110 is connected to the liquid inlet pipe 120 and the liquid outlet pipe 130, and the liquid outlet pipe 130 is provided with a heat dissipation structure of a controller 340 as described in any of the above technical solutions. The reasoning process of the beneficial effects of the shielded pump and the heat dissipation structure of the controller 340 provided in this application is similar and will not be repeated here.

[0043] Specifically, such as Figure 6As shown, the motor 200 includes a housing 220, a stator assembly 230 and a shielding sleeve structure 240. The stator assembly 230 and the shielding sleeve structure 240 are fixedly installed in the housing 220. The shielding sleeve structure 240 includes a rotor assembly 241, a shielding sleeve 242 and a bracket cover 243. The shielding sleeve 242 is a cylindrical structure with one end open. The bracket cover 243 is covered at the opening of the shielding sleeve 242. The rotor assembly 241 includes a rotor 2412 and a rotating shaft 2411. The rotor assembly 241 is located in the shielding sleeve 242 and one end of the rotating shaft 2411 is fixed to the housing 220. The end passes through the bracket cover 243; the bracket cover 243 is provided with a plurality of flow holes 2431 connecting the pump chamber 110 and the opening side of the shielding sleeve 242, and the rotating shaft 2411 is provided with an axial hole 2413 along the axial direction, and the axial hole 2413 connects the pump chamber 110 and the bottom side of the shielding sleeve 242. The rotor 2412 is located between the bottom side and the opening side of the shielding sleeve 242, and a gap is formed between the outer wall of the rotor 2412 and the inner wall of the shielding sleeve 242, so that the liquid medium in the pump chamber 110 can circulate in the shielding sleeve 242 and the rotating shaft 2411. In this embodiment, a liquid medium circulation channel is formed inside the shielded pump motor 200 as shown by the arrow in the figure. The rotor assembly 241 in the motor 200 is lubricated and cooled by the liquid medium, so that the operating state of the motor 200 is more stable. However, when the shielded pump stops running, the liquid medium in the pump chamber 110 and the motor 200 will continue to decrease due to pipeline leakage. Therefore, in this embodiment, when the liquid level in the pump chamber 110 decreases, the liquid medium in the liquid storage chamber 311 flows back to the pump chamber 110 and the motor 200, thereby slowing down the liquid level drop speed of the liquid medium in the motor 200 and preventing a large amount of air from entering the motor 200, causing the friction force of the motor 200 to increase and the cooling effect to decrease.

[0044] In summary, this embodiment designs the heat dissipation structure of the controller 340 into the cooling circulation channel of the shielded pump motor 200, and uses the liquid cooling medium flowing in the motor 200 to cool the motor 200 controller 340, thereby improving the heat dissipation efficiency of the motor 200 controller 340, and further improving the operating stability and service life of the motor 200. The above is only a specific embodiment of the present application, but the scope of protection of the present application is not limited to this. Those skilled in the art should understand that the present application includes but is not limited to the contents described in the drawings and the above specific embodiments. 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 a controller (340) of a shielded pump, wherein the shielded pump comprises a pump body (100) and a motor (200), wherein a pump cavity (110) is formed in the pump body (100), and wherein a liquid inlet pipe (120) and a liquid outlet pipe (130) communicating with the pump cavity (110) are further provided on the pump body (100), and an impeller (210) is provided on the output shaft of the motor (200), wherein the impeller (210) is located in the pump cavity (110) and follows the output shaft of the motor (200) in a rotating state or a stopped state, and wherein: A liquid storage device (310) is provided beside the liquid outlet pipe (130) and is in communication with 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 a controller (340), the heat dissipation bracket (320) is used to absorb heat energy of the controller (340) and conduct it to the liquid medium in the liquid storage chamber (311), and the controller (340) is used to control the motor (200); 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 point 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).

2. The controller heat dissipation structure according to claim 1, characterized in that: The heat dissipation bracket (320) comprises a mounting portion (321) for mounting the controller (340) and a connecting portion (322) for fixedly connecting to 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 into the mounting hole (3221).

3. The controller heat dissipation structure according to claim 2, characterized in that: The mounting portion (321) is formed with a mounting surface (3211), the controller (340) is abutted against 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 fixed connection with the connecting portion (322).

4. The controller heat dissipation structure according to claim 2, characterized in that: The connecting portion (322) and the mounting portion (321) are configured as an integrated structure, and the heat dissipation bracket (320) is entirely made of aluminum profile.

5. The controller heat dissipation structure according to claim 3, characterized in that: The mounting portion (321) includes a heat exchange plate, the main planes of which are respectively set as the mounting surface (3211) and the connection surface (3212), and a plurality of liquid flow channels (3213) are provided inside the heat exchange plate, and the liquid flow channels (3213) are connected to the liquid storage chamber (311).

6. The controller heat dissipation structure according to any one of claims 1 to 5, 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 and the liquid outlet pipe (130) are arranged vertically. Alternatively, the liquid storage cylinder is tilted downward from the bottom of the cylinder to the cylinder mouth, and the angle between the central axis of the liquid storage cylinder and the horizontal plane is α, α∈(0, 5].

7. The controller heat dissipation structure according to claim 6, characterized in that: A cover (330) is also provided above the heat dissipation bracket (320); the cover (330) is sealedly connected to the heat dissipation bracket (320) to form a sealed cavity; the controller (340) is located in the sealed cavity.

8. A shielded 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 provided on the output shaft of the motor (200); the impeller (210) is located in the pump chamber (110) and follows the output shaft of the motor (200) in a rotating state or a stopped state; the pump chamber (110) is connected to the liquid inlet pipe (120) and the liquid outlet pipe (130); and the controller heat dissipation structure according to any one of claims 1 to 7 is provided on the liquid outlet pipe (130).

9. The canned motor pump according to claim 8, characterized in that: The motor (200) further comprises a housing (220), a stator assembly (230) and a shielding sleeve structure (240), wherein the stator assembly (230) and the shielding sleeve structure (240) are fixedly installed in the housing (220), the shielding sleeve structure (240) comprises a rotor assembly (241), a shielding sleeve (242) and a bracket cover (243), the shielding sleeve (242) is configured as a cylindrical structure with one end open, the bracket cover (243) is configured to cover the opening of the shielding sleeve (242), the rotor assembly (241) comprises a rotor (2412) and a rotating shaft (2411), the rotor assembly (241) is located in the shielding sleeve (242), and one end of the rotating shaft (2411) passes through the bracket cover (243); The bracket cover (243) is provided with a plurality of flow holes (2431) communicating with the pump chamber (110) and the opening side of the shielding sleeve (242); the rotating shaft (2411) is provided with an axial hole (2413) along the axial direction; the axial hole (2413) communicates with the pump chamber (110) and the bottom side of the shielding sleeve (242); the rotor (2412) is located between the bottom side and the opening side of the shielding sleeve (242); a gap is formed between the outer wall of the rotor (2412) and the inner wall of the shielding sleeve (242), so that the liquid medium in the pump chamber (110) can circulate in the shielding sleeve (242) and the rotating shaft (2411).

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