Shielded Pump

Abstract

The present invention discloses a canned motor pump, comprising a pump body and a motor. The pump body and the motor are sealed to form a pump cavity. The pump body is provided with a liquid inlet pipe and a liquid outlet pipe connected to the pump cavity. The motor comprises a bracket cover, a housing, a rear housing, and a controller. The housing forms an installation cavity, in which a stator assembly, a shielding sleeve, and a rotor assembly are disposed. The rear housing is provided with a mounting surface for mounting the controller on a surface facing the outside of the motor. The rear housing is provided with a heat dissipation pipe for cooling the controller. A cooling pipe is sealed between one end of the heat dissipation pipe and the liquid outlet pipe, and the other end is connected to the pump cavity through the interior of the shielding sleeve, thereby forming a cooling circulation channel in the canned pump that connects the pump cavity, the heat dissipation pipe, and the interior of the shielding sleeve. By providing a cooling circulation channel in the canned pump that connects the pump cavity, the heat dissipation pipe, and the shielding sleeve, the cooling efficiency of the entire motor by the liquid medium is improved. At the same time, the heat dissipation pipe is used to dissipate heat from the motor controller, thereby improving the heat dissipation efficiency of the motor controller.

Description

Technical Field

[0001] The present application relates to the technical field of shielded pumps, and in particular to 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 related technologies, the motor controller is fixed to the outer wall of the housing and uses air cooling, which has low heat dissipation efficiency. In high ambient temperatures, the motor controller's excessive temperature can seriously affect its operational stability and service life. Furthermore, the liquid medium used to cool the motor circulates only within the pump cavity and shielding sleeve, with a low flow rate and flow rate, resulting in inefficient cooling of the motor.

[0004] Therefore, it is necessary to design a canned motor pump that can perform liquid cooling on the motor controller and has higher overall cooling efficiency. 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 shielded pump, comprising a pump body and a motor, wherein the pump body and the motor are sealed to form a pump cavity, the pump body is provided with a liquid inlet pipe and a liquid outlet pipe communicating with the pump cavity, the motor comprises a bracket cover, a casing, a rear casing, and a controller, the casing is configured as a cylinder with openings at both ends, the bracket cover and the rear casing are respectively sealed and connected to the openings at both ends of the casing, so that an installation cavity is formed in the casing, the installation cavity is provided with a stator assembly, a shielding sleeve, and a rotor assembly, and the rotor assembly is located within the shielding sleeve;

[0006] The rear housing is provided with a mounting surface for mounting the controller on a surface facing the outside of the motor, and the rear housing is provided with a heat dissipation pipe for cooling the controller;

[0007] A cooling pipe is sealed between one end of the heat dissipation pipe and the liquid outlet pipe, and the other end is connected to the pump cavity through the inside of the shielding sleeve, so that a cooling circulation channel connecting the pump cavity, the heat dissipation pipe and the inside of the shielding sleeve is formed in the shielded pump.

[0008] In the present technical solution, a mounting surface for mounting the controller is provided on the rear housing, and a heat dissipation pipe is provided on the rear housing to dissipate heat for the controller. A cooling circulation channel connecting the pump chamber, the heat dissipation pipe and the shielding sleeve is provided, so that the high-speed flowing liquid medium in the liquid outlet pipe connected to the pump chamber enters the cooling circulation channel to cool the stator assembly, rotor assembly and controller of the motor, thereby increasing the contact area between the cooling circulation channel and the various components in the motor, and increasing the circulation speed of the liquid medium, thereby improving the cooling efficiency of the motor and its controller, and further improving the operating stability and service life of the motor.

[0009] Preferably, the cooling pipe is arranged in the casing, and a filtering device is provided at the end of the cooling pipe connected to the liquid outlet pipe.

[0010] Preferably, one end of the shielding sleeve is provided with an opening, and the other end is sealed and connected to the heat dissipation pipe. The bracket cover is sealed and connected to the open end of the shielding sleeve. The bracket cover is provided with a flow hole that connects the inside of the shielding sleeve to the pump chamber.

[0011] Preferably, the rotor assembly includes a rotating shaft and a magnet, the magnet is sleeved on the rotating shaft, the magnet is located in the shielding sleeve, and a gap is provided between the circumferential outer surface of the magnet and the inner wall of the shielding sleeve, and the stator assembly is sleeved on the outside of the shielding sleeve.

[0012] Preferably, the output end of the rotating shaft passes through the bracket cover and is located in the pump cavity. The output end of the rotating shaft is fixedly connected to an impeller, and the impeller is used to drive the liquid medium in the pump cavity to flow toward the liquid outlet pipe and the cooling pipe.

[0013] Preferably, the filtering device includes a filter screen and a pressure plate, the filter screen is located at the inlet end of the cooling pipe connected to the liquid outlet pipe, and the pressure plate abuts against the side of the filter screen facing the cooling pipe.

[0014] Preferably, the rear shell includes a heat dissipation bracket and a heat dissipation pipe, the heat dissipation bracket is provided with the mounting surface, a side surface of the heat dissipation bracket facing the mounting cavity is set as a connecting surface, and the heat dissipation pipe is fixedly connected to the connecting surface.

[0015] Preferably, the heat dissipation pipe includes a heat exchange pipe, a first bend pipe and a second bend pipe, the first bend pipe sealingly connects the cooling pipe and the heat exchange pipe, and the second bend pipe sealingly connects the heat exchange pipe and the shielding sleeve.

[0016] Preferably, a mounting through hole for mounting the heat exchange tube is integrally formed on the connection surface of the heat dissipation bracket, and the heat exchange tube is sleeved in the mounting through hole;

[0017] Alternatively, the heat dissipation bracket and the heat exchange tube are configured as an integrated structure.

[0018] Preferably, the outer side of the rear shell is further covered with a cover, and the cover is sealed to the casing.

[0019] 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

[0020] The present application will be further described below with reference to the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of the canned motor pump according to an embodiment of the present application;

[0022] Figure 2 This is a schematic cross-sectional view of a canned motor pump according to an embodiment of the present application;

[0023] Figure 3 This is a schematic diagram of the connection structure between the shielding sleeve and the bracket cover according to an embodiment of the present application;

[0024] Figure 4 This is a schematic diagram of the exploded structure of the rear housing of an embodiment of the present application;

[0025] Figure 5 This is a schematic diagram of the structure of the filtering device according to an embodiment of the present application.

[0026] Description of reference numerals:

[0027] Among them, 100, pump chamber; 110, liquid inlet pipe; 120, liquid outlet pipe; 210, bracket cover; 211, flow hole; 220, casing; 221, cooling pipe; 222, filter device; 2221, filter screen; 2222, pressure plate; 230, rear shell; 231, heat dissipation bracket; 2311, mounting surface; 2312, connecting surface; 2313, mounting through hole; 232, heat dissipation pipe; 2321, heat exchange pipe; 2322, first bend pipe; 2323, second bend pipe; 240, controller; 250, stator assembly; 260, shielding sleeve; 270, rotor assembly; 271, rotating shaft; 272, magnet; 280, impeller; 290, cover. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] The shielded pump isolates the motor stator assembly 250 from the rotor assembly 270 and the conveying medium through the shielding sleeve 260 to prevent leakage of the conveying medium. At the same time, a circulating cooling channel is set up to allow the conveyed liquid medium to flow into the rotor assembly 270 to cool the motor and lubricate the rotor bearings. However, in the related art, the motor controller 240 is set outside the motor casing 220, and an independent heat dissipation system is used for heat dissipation or no heat dissipation system is set. Under high ambient temperature conditions, the motor controller 240 without a heat dissipation system will affect the operating stability and service life of the controller 240 due to excessively high temperature. Designing an independent heat dissipation system will increase the size and installation difficulty of the shielded pump. At the same time, in the related art, the circulating cooling channel in the shielded pump circulates only in the pump cavity 100 and the shielding sleeve 260. Specifically, by setting a through hole on the bracket cover 210, the liquid medium in the pump cavity 100 flows into the shielding sleeve 260 through the through hole on the bracket cover 210, and flows into the bottom of the shielding sleeve 260 after passing through the rotor surface, and then flows back to the pump cavity 100 from the bottom of the shielding sleeve 260 along the through hole in the rotating shaft 271. The liquid medium in the circulating cooling channel has a small flow rate and a low flow rate, and the cooling efficiency of the motor is not high. In view of this, the researchers of this application proposed a shielded pump with a new cooling circulation structure and can dissipate heat from the controller 240 through the circulating cooling channel in the shielded pump, thereby improving the cooling efficiency.

[0031] like Figure 1 、 2As shown, this embodiment proposes a shielded pump, including a pump body and a motor, the pump body and the motor are sealed to form a pump chamber 100, the pump body is provided with a liquid inlet pipe 110 and a liquid outlet pipe 120 connected to the pump chamber 100, the motor includes a bracket cover 210, a casing 220, a rear casing 230 and a controller 240, the casing 220 is set to a cylindrical shape with openings at both ends, the bracket cover 210 and the rear casing 230 are respectively sealed and connected to the openings at both ends of the casing 220, so that an installation cavity is formed in the casing 220, and a stator assembly 250, a shielding sleeve 260 and a rotor are provided in the installation cavity. Subassembly 270, the rotor assembly 270 is located in the shielding sleeve 260; the surface of the rear shell 230 facing the outside of the motor is provided with a mounting surface 2311 for mounting the controller 240, and the rear shell 230 is provided with a heat dissipation pipe 232 for cooling the controller 240; one end of the heat dissipation pipe 232 is sealed and connected to the liquid outlet pipe 120 with a cooling pipe 221, and the other end is connected to the pump cavity 100 through the inside of the shielding sleeve 260, so that a cooling circulation channel is formed in the shielded pump to connect the pump cavity 100, the heat dissipation pipe 232 and the inside of the shielding sleeve 260. The cooling circulation channel in the shielded pump is as follows Figure 2 As shown, when the motor rotates, the impeller 280 drives the liquid medium in the pump chamber 100 to flow toward the liquid outlet pipe 120 at a high speed. A large amount of liquid medium flows out of the shielded pump from the outlet of the liquid outlet pipe 120, and a small amount of liquid medium enters the cooling pipe 221 connected to the liquid outlet pipe 120. The liquid medium entering the cooling pipe 221 flows along the pipeline through the heat dissipation pipe 232 and absorbs part of the heat energy released by the controller 240, and then enters the shielding sleeve 260 along the pipeline to cool the stator assembly 250 and the rotor assembly 270, and then flows back to the pump chamber 100 from the shielding sleeve 260. In this embodiment, a cooling pipe 221 is set from the liquid outlet pipe 120 where the liquid flow rate is higher, so that the flow rate of the liquid medium entering the cooling pipe 221 is higher than the technical solution of flowing from the bracket cover 210 into the shielding sleeve 260 in the related technology, the flow rate is also larger, and the corresponding heat dissipation efficiency is also higher.

[0032] This embodiment dissipates heat from the controller 240 by providing a mounting surface 2311 for mounting the controller 240 on the rear housing 230 and a heat dissipation pipe 232 on the rear housing 230. In addition, a cooling circulation channel connecting the pump chamber 100, the heat dissipation pipe 232 and the shielding sleeve 260 is provided, so that the high-speed flowing liquid medium in the liquid outlet pipe 120 connected to the pump chamber 100 enters the cooling circulation channel to cool the stator assembly 250, the rotor assembly 270 and the controller 240 of the motor, thereby increasing the contact area between the cooling circulation channel and the various components in the motor, thereby improving the cooling efficiency of the motor and its controller 240, and further improving the operating stability and service life of the motor.

[0033] In some embodiments, as Figure 2 As shown, the cooling pipe 221 is arranged in the casing 220, and the end of the cooling pipe 221 that is connected to the liquid outlet pipe 120 is provided with a filter device 222. The cooling pipe 221 is arranged inside the casing 220, and the liquid medium can absorb the heat energy of the casing 220 when flowing through the cooling pipe 221, further improving the cooling effect on the motor. In addition, the cooling pipe 221 of this embodiment is molded inside the casing 220, making it more convenient to connect the cooling pipe 221 with the pump chamber 100 and the heat dissipation pipe 232, and the structural strength is also better and not easy to damage. As an example, the casing 220 is injection molded or cast and processed by plastic or metal material. It should be noted that in other embodiments, the cooling pipe 221 can also be independently arranged outside the casing 220, and one end of the independently arranged cooling pipe 221 is sealed and connected to the liquid outlet pipe 120, and the other end is sealed and connected to the heat dissipation pipe 232.

[0034] In some embodiments, as Figure 2 、 3 As shown, the shielding sleeve 260 is a cylindrical structure with a bottom, one end of which is provided with an opening, and the bottom of the other end is provided with a through hole, and the side cover of the opening is provided with the bracket cover 210, and the edge of the bracket cover 210 is sealed and connected between the casing 220 and the pump body, so that the rest of the space inside the casing 220 except the inside of the shielding sleeve 260 is sealed and isolated from the pump chamber 100, that is, the installation space of the stator assembly 250 as shown in the figure is sealed and isolated from the pump chamber 100, preventing the liquid medium in the pump chamber 100 from entering the installation space of the stator assembly 250, and the part of the bracket cover 210 covering the open end of the shielding sleeve 260 is provided with an overflow hole 211, so that the inside of the shielding sleeve 260 The liquid medium can flow back into the pump chamber 100 from the flow hole 211; a through hole is provided at one end of the bottom of the shielding sleeve 260, and the through hole extends to the outside of the bottom of the shielding sleeve 260 and is sealed and connected to the heat dissipation pipe 232. Specifically, the second bend pipe 2323 of the heat dissipation pipe 232 is sealed and connected in the through hole, and plug connectors are provided at both ends of the second bend pipe 2323, one end of the plug connector is inserted into the heat exchange pipe 2321, and the other end is inserted into the through hole at the bottom of the shielding sleeve 260, so that the heat exchange pipe 2321 is sealed and connected with the shielding sleeve 260, and the cooling medium in the heat exchange pipe 2321 can flow into the shielding sleeve 260, preventing the liquid medium from flowing into the installation space outside the shielding sleeve 260. In this embodiment, a bracket cover 210 with a through hole and a sealed second bend pipe 2323 are respectively provided at both ends of the shielding sleeve 260 to prevent the liquid medium from flowing into the installation cavity where the stator assembly 250 is located. The liquid medium flows through the surface of the rotor magnet 272 and the inner wall of the shielding sleeve 260 in the shielding sleeve 260, thereby cooling the rotor assembly 270 and the stator assembly 250. At the same time, the liquid medium also serves to lubricate the rotor and its bearings.

[0035] Specifically, such as Figure 2 As shown, the rotor assembly 270 includes a rotating shaft 271 and a magnet 272. The magnet 272 is sleeved on the rotating shaft 271 and located in the shielding sleeve 260. A gap is provided between the circumferential outer surface of the magnet 272 and the inner wall of the shielding sleeve 260. The stator assembly 250 is sleeved on the outside of the shielding sleeve 260. When the motor is working, the stator assembly 250 is energized to generate a magnetic field. The magnet 272 in the rotor assembly 270 rotates under the action of the magnetic field force. In order to better cool the stator assembly 250 and the rotor assembly 270, the stator assembly 250 is sleeved on the outside of the shielding sleeve 260. Figure 2 As shown, the stator assembly 250 abuts against the outer wall of the shielding sleeve 260, so that the heat energy generated when the stator assembly 250 is powered on can be quickly conducted to the side wall of the shielding sleeve 260, and then the heat energy of the side wall of the shielding sleeve 260 is absorbed by the liquid medium flowing through the gap between the circumferential outer surface of the magnet 272 and the inner wall of the shielding sleeve 260. At the same time, the magnet 272 will also generate heat energy when rotating at high speed inside the shielding sleeve 260. The liquid medium can also absorb the heat energy of the magnet 272 when flowing through the gap between the circumferential outer surface of the magnet 272 and the inner wall of the shielding sleeve 260, that is, the technical effect of cooling the rotor assembly 270 and the stator assembly 250 by the liquid medium is achieved. In a specific embodiment, the gap between the magnet 272 and the inner wall of the shielding sleeve 260 is usually set to 1~3mm.

[0036] In some embodiments, as Figure 2 、 3 As shown, the output end of the rotating shaft 271 passes through the bracket cover 210 and is located in the pump chamber 100. The output end of the rotating shaft 271 is fixedly connected to the impeller 280, and the impeller 280 is used to drive the liquid medium in the pump chamber 100 to flow toward the liquid outlet pipe 120 and the cooling pipe 221. A mounting hole is provided at the center of the bracket cover 210, and the rotating shaft 271 passes through the mounting hole and extends into the pump chamber 100. An impeller 280 is sleeved on the end of the rotating shaft 271 that passes through the bracket cover 210. The impeller 280 is located in the pump chamber 100. When the rotating shaft 271 rotates, the impeller 280 rotates with the rotating shaft 271 and drives the liquid medium in the pump chamber 100 to flow. Specifically, the impeller 280 drives the liquid medium entering from the liquid inlet pipe 110 to flow quickly to the liquid outlet pipe 120. After entering the liquid outlet pipe 120, a small amount of liquid medium will enter the cooling pipe 221 connected to the side wall of the liquid outlet pipe 120, thereby driving the liquid medium to circulate in the cooling pipe 221, the heat dissipation pipe 232, the inside of the shielding sleeve 260 and the pump chamber 100.

[0037] As a way to implement Figure 2 、 5As shown, the filter device 222 includes a filter screen 2221 and a pressure plate 2222. The filter screen 2221 is located at the inlet end of the cooling pipe 221 connecting to the liquid outlet pipe 120, and the pressure plate 2222 abuts against the side of the filter screen 2221 facing the cooling pipe 221. The filter device 222 is disposed at the outlet of the cooling pipe 221 near the liquid outlet pipe 120. The filter device 222 can filter out solid particles and other impurities in the cooling medium. The filter screen 2221 can block solid particles outside of the filter screen, preventing impurities from entering the shielding sleeve 260 and damaging the motor. At the same time, the pressure plate 2222 secures the filter screen 2221 at the outlet of the cooling pipe 221 near the liquid outlet pipe 120. While the filter screen 2221 is secured, the high-speed liquid medium flowing in the liquid outlet pipe 120 flushes away the particles blocked by the filter screen 2221, preventing impurities from accumulating outside the filter screen 2221 and causing blockage.

[0038] In some embodiments, as Figure 2 、 4 As shown, the rear housing 230 includes a heat dissipation bracket 231 and a heat dissipation pipe 232. The heat dissipation bracket 231 is provided with the mounting surface 2311. The side surface of the heat dissipation bracket 231 facing the mounting cavity is set as a connection surface 2312. The heat dissipation pipe 232 is fixedly connected to the connection surface 2312. The heat dissipation bracket 231 is set as a plate-like structure, and its two opposite main surfaces are respectively set as the mounting surface 2311 and the connection surface 2312. Figure 4 In the figure, the upper surface of the heat dissipation bracket is set as the installation surface 2311, and the lower surface is set as the connection surface 2312. The controller 240 is installed on the installation surface 2311 of the heat dissipation bracket 231 to realize the cooling and heat dissipation of the controller 240 by the heat dissipation bracket 231, and a heat dissipation pipe 232 connected to the circulating cooling channel is set on the connection surface 2312 of the heat dissipation bracket 231, so that the liquid cooling medium in the circulating cooling channel in the shielded pump flows through the heat dissipation pipe 232 to realize liquid cooling of the heat dissipation bracket 231 and the controller 240 by the liquid cooling medium. The liquid medium and the metal solid medium have higher thermal conductivity efficiency than the air. Therefore, for example, the heat dissipation bracket 231 and the heat dissipation pipe 232 are made of aluminum metal material. The aluminum profile has the advantages of light weight, corrosion resistance, easy molding, and high thermal conductivity efficiency. It is the preferred material for manufacturing the heat dissipation bracket 231.

[0039] In some embodiments, as Figure 2 、 4As shown, the heat dissipation pipe 232 includes a heat exchange pipe 2321, a first elbow 2322, and a second elbow 2323. The first elbow 2322 seals the cooling pipe and the heat exchange pipe 2321, and the second elbow 2323 seals the heat exchange pipe 2321 and the shielding sleeve 260. The first elbow 2322 and the second elbow 2323 are plugged into and sealably connected to both ends of the heat exchange pipe 2321. The other end of the first elbow 2322 seals the cooling pipe 221 (relative to the end connected to the heat exchange pipe 2321), and the other end of the second elbow 2323 seals the bottom of the shielding pump. By providing the first elbow 2322 and the second elbow 2323, the direction of the pipe is adjusted, and heat is dissipated from the controller 240 through the heat exchange pipe 2321.

[0040] In some embodiments, as Figure 2 、 4 As shown, the connection surface 2312 of the heat dissipation bracket 231 is integrally formed with a mounting hole 2313 for mounting the heat exchange tube 2321, and the heat exchange tube 2321 is sleeved within the mounting hole 2313; alternatively, the heat dissipation bracket and the heat exchange tube 2321 are integrally formed. The connection surface 2312 of the heat dissipation bracket 231 is integrally formed with a mounting hole 2313 for mounting the heat exchange tube 2321. Specifically, the heat exchange tube 2321 and the heat dissipation bracket 231 are configured as a separate structure. The upper surface of the heat dissipation bracket 231 is configured as the mounting surface 2311 of the controller 240, and the connection surface 2312 is used for mounting the heat exchange tube 2321 and for sealing connection with the housing 220. The heat exchange tube 2321 and the controller 240 are respectively disposed on the upper and lower opposite sides of the heat dissipation bracket 231. The heat dissipation bracket 231 is configured as a thin sheet structure, which is conducive to improving heat conduction efficiency. In other embodiments, the heat exchange tube 2321 is integrally formed on the connecting surface 2312 of the heat dissipation bracket 231, that is, the heat exchange tube 2321 and the heat dissipation bracket 231 are set as an integrated structure, and the heat exchange tube 2321 and the heat dissipation bracket 231 are integrally cast. The integrated structure can reduce the number of parts and slightly improve the heat transfer efficiency.

[0041] In some embodiments, the controller 240 includes a circuit board. The mounting surface 2311 of the heat dissipation bracket 231 abuts the circuit board, and the circuit board is fixedly connected to the heat dissipation bracket 231 via screws. The circuit board is provided with a heating element, and the heat dissipation bracket 231 is used to dissipate heat from the heating element of the controller 240. To improve the heat dissipation effect, the circuit board is typically mounted abutting the heat dissipation bracket 231. In some embodiments, a heat-conducting medium such as thermally conductive silicone or thermally conductive resin can be provided between the heat dissipation bracket 231 and the circuit board to further improve heat conduction efficiency.

[0042] In some embodiments, as Figure 1 、 2 As shown, the outer side of the rear shell 230 is also covered with a cover body 290, and the cover body 290 is sealed with the housing 220. In other embodiments, a connecting shell is further provided between the cover body 290 and the housing 220. By providing the connecting shell, the size of the cavity enclosed by the cover body 290 and the rear shell 230 can be adjusted to be suitable for installing controllers 240 of different sizes.

[0043] In summary, the above embodiment dissipates heat for the controller 240 by providing a mounting surface 2311 for installing the controller 240 on the rear shell 230 and providing a heat dissipation pipe 232 on the rear shell 230, and also provides a cooling circulation channel connecting the pump chamber 100, the heat dissipation pipe 232 and the shielding sleeve 260, so that the high-speed flowing liquid medium in the liquid outlet pipe 120 connected to the pump chamber 100 enters the cooling circulation channel to cool the stator assembly 250, the rotor assembly 270 and the controller 240 of the motor, thereby increasing the contact area between the cooling circulation channel and the various components in the motor, thereby improving the cooling efficiency of the motor and its controller 240, and further improving the operating stability and service life of the motor.

[0044] The above are only specific embodiments of the present application, but the scope of protection 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 contents described in the drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present application are included within the scope of the claims.

Claims

1. A shielded pump, comprising a pump body and a motor, wherein the pump body and the motor are sealed to form a pump cavity (100), and the pump body is provided with a liquid inlet pipe (110) and a liquid outlet pipe (120) communicating with the pump cavity (100), characterized in that: The motor comprises a bracket cover (210), a housing (220), a rear housing (230) and a controller (240); the housing (220) is configured as a cylinder with two ends open; the bracket cover (210) and the rear housing (230) are respectively sealed and connected to the two end openings of the housing (220) to form an installation cavity in the housing (220); a stator assembly (250), a shielding sleeve (260) and a rotor assembly (270) are arranged in the installation cavity; and the rotor assembly (270) is located in the shielding sleeve (260); A mounting surface (2311) for mounting the controller (240) is provided on the surface of the rear housing (230) facing the outside of the motor, and a heat dissipation pipe (232) for cooling the controller (240) is provided on the rear housing (230); A cooling pipe (221) is sealed between one end of the heat dissipation pipe (232) and the liquid outlet pipe (120), and the other end is connected to the pump cavity (100) through the interior of the shielding sleeve (260), so that a cooling circulation channel is formed in the shielded pump, which is connected to the pump cavity (100), the heat dissipation pipe (232), and the interior of the shielding sleeve (260); The heat dissipation pipe (232) comprises a heat exchange pipe (2321), a first bend pipe (2322) and a second bend pipe (2323), wherein the first bend pipe (2322) seals and connects the cooling pipe and the heat exchange pipe (2321), and the second bend pipe (2323) seals and connects the heat exchange pipe (2321) and the shielding sleeve (260).

2. The canned motor pump according to claim 1, characterized in that: The cooling pipe (221) is arranged in the housing (220), and a filtering device (222) is provided at the end of the cooling pipe (221) on the side communicating with the liquid outlet pipe (120).

3. The canned motor pump according to claim 1, characterized in that: One end of the shielding sleeve (260) is provided with an opening, and the other end thereof is sealed and connected to the heat dissipation pipe (232); the bracket cover (210) is sealed and connected to the open end of the shielding sleeve (260); and the bracket cover (210) is provided with a flow hole (211) that connects the interior of the shielding sleeve (260) to the pump chamber (100).

4. The canned motor pump according to claim 3, characterized in that: The rotor assembly (270) comprises a rotating shaft (271) and a magnet (272), wherein the magnet (272) is sleeved on the rotating shaft (271), the magnet (272) is located in the shielding sleeve (260), and a gap is provided between the circumferential outer surface of the magnet (272) and the inner side wall of the shielding sleeve (260), and the stator assembly (250) is sleeved on the outside of the shielding sleeve (260).

5. The canned motor pump according to claim 4, characterized in that: The output end of the rotating shaft (271) passes through the bracket cover (210) and is located in the pump chamber (100). The output end of the rotating shaft (271) is fixedly connected to an impeller (280). The impeller (280) is used to drive the liquid medium in the pump chamber (100) to flow toward the liquid outlet pipe (120) and the cooling pipe (221).

6. The canned motor pump according to claim 2, characterized in that: The filtering device (222) comprises a filter screen (2221) and a pressure plate (2222); the filter screen (2221) is located at the inlet end of the cooling pipe (221) connected to the liquid outlet pipe (120); and the pressure plate (2222) abuts against the side of the filter screen (2221) facing the cooling pipe (221).

7. The canned motor pump according to any one of claims 1 to 6, characterized in that: The rear housing (230) comprises a heat dissipation bracket (231) and a heat dissipation pipe (232); the heat dissipation bracket (231) is provided with the mounting surface (2311); a side surface of the heat dissipation bracket (231) facing the mounting cavity is provided as a connection surface (2312); and the heat dissipation pipe (232) is fixedly connected to the connection surface (2312).

8. The canned motor pump according to claim 7, characterized in that: An installation through hole (2313) for installing the heat exchange tube (2321) is integrally formed on the connection surface (2312) of the heat dissipation bracket (231), and the heat exchange tube (2321) is sleeved in the installation through hole (2313); Alternatively, the heat dissipation bracket (231) and the heat exchange tube (2321) are configured as an integrated structure.

9. The canned motor pump according to any one of claims 1 to 6, characterized in that: The outer side of the rear shell (230) is also covered with a cover (290), and the cover (290) is sealed and connected to the housing (220).

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