Self-circulating cooling canned motor pump

Abstract

A self-circulating cooling canned motor pump, comprising a pump body (1) and a cooling device (2), wherein a liquid inlet cavity (11) and a cooling cavity (12) are provided in the pump body (1); an enclosure (15) is provided in the pump body (1); the enclosure (15) is in communication with the liquid inlet cavity (11) and the cooling cavity (12); a hollow rotating shaft (14) is rotatably connected in the enclosure (15); a plurality of impellers (16) are respectively provided at two ends of the hollow rotating shaft (14); the cooling device (2) is used for cooling the pump body (1); the cooling device (2) comprises a plurality of cooling tubes (21) and a conveying assembly (22); the plurality of cooling tubes (21) are evenly distributed along the outer surface of the pump body; two cooling tubes (21) are separately in communication with the liquid inlet cavity (11); the conveying assembly (22) is used for conveying liquid in the liquid inlet cavity (11) into the plurality of cooling tubes (21). Heat dissipation can be performed on both the interior and the exterior of the canned motor pump, achieving a good heat dissipation effect.

Description

A self-circulating cooling shielded pump Technical Field

[0001] This invention relates to the field of canned motor pump technology, and in particular to a self-circulating cooling canned motor pump. Background Technology

[0002] A canned motor pump is a seal-free pump that works by fixing the rotor of a three-phase asynchronous canned motor and the pump impeller together on the same shaft, and then shielding the rotor with a shield. The stator of the canned motor pump surrounds the shield, which is made of metal. Power is transmitted to the rotor through a magnetic field, and the entire rotor operates in the pumped liquid, thus achieving complete leak-free operation.

[0003] However, the motor stator windings and sliding bearing friction pairs are shielded inside the shielding cover, resulting in poor heat dissipation. This is especially true for high-power, high-speed canned pumps, which generate a lot of heat, easily leading to motor winding burnout or wear of the friction pairs. Summary of the Invention

[0004] To improve the heat dissipation of the canned motor pump, this application provides a self-circulating cooling canned motor pump.

[0005] The self-circulating cooling shielded pump provided in this application adopts the following technical solution:

[0006] A self-circulating cooled shielded pump includes a pump body and a cooling device. The pump body has an inlet chamber and a cooling chamber. A shield is provided inside the pump body, and the shield connects the inlet chamber and the cooling chamber. A hollow shaft is rotatably connected inside the shield. Several impellers are provided at both ends of the hollow shaft. The cooling device is used to cool the pump body. The cooling device includes multiple cooling pipes and a conveying assembly. The multiple cooling pipes are evenly distributed along the outer surface of the pump body. Two of the cooling pipes are connected to the inlet chamber. The conveying assembly is used to convey liquid in the inlet chamber to the multiple cooling pipes.

[0007] By adopting the above technical solution, when the impeller in the cooling chamber rotates, it drives the liquid to flow from the inlet chamber through the shield to the cooling chamber, cooling the inner side of the pump body. Through the conveying component, the liquid in the inlet chamber is conveyed to multiple cooling pipes. The cooling pipes themselves can increase the heat dissipation area of ​​the pump body surface. The liquid then flows through the cooling pipes to dissipate heat, enhancing the cooling of the outer side of the pump body. This allows the canned pump to dissipate heat from both its inner and outer sides during operation, increasing the heat dissipation performance of the canned pump.

[0008] Preferably, the conveying assembly includes multiple hoses and multiple rollers. One end of each hose is fixedly connected to a multiple cooling pipe along its axial direction, and the other end of each hose is fixedly connected to an adjacent cooling pipe. The multiple rollers are slidably connected to the pump body. The multiple hoses are located on the movement paths of the multiple rollers. When the rollers slide onto the hoses, the hoses are squeezed and deformed.

[0009] By adopting the above technical solution, the sliding of the rollers squeezes the hose, causing the liquid inside the hose to be squeezed into the cooling pipe in the direction of the rollers' rolling. After the liquid inside the hose is expelled, a partial vacuum is created, drawing the liquid from the other side into the hose. By orderly pressing multiple hoses, the liquid inside the multiple hoses circulates, cooling and dissipating heat on the outer surface of the pump body, thus increasing the heat dissipation performance of the canned pump.

[0010] Preferably, the plurality of hoses are located in the liquid inlet chamber and the cooling chamber respectively, and the plurality of hoses are evenly distributed around the circumferential side of the hollow rotating shaft. The hollow rotating shaft is provided with a plurality of connecting rods, each of which corresponds to a plurality of rollers. The plurality of connecting rods are respectively disposed on the hollow rotating shaft, and the plurality of rollers are rotatably connected to the connecting rods. The plurality of connecting rods in the liquid inlet chamber and the plurality of connecting rods in the cooling chamber are staggered.

[0011] By adopting the above technical solution, a connecting rod is installed on the hollow shaft, and the roller is rotatably connected to the connecting rod. When the hollow shaft of the canned pump moves, it drives the roller to squeeze the hose. That is, the faster the rotation speed of the hollow shaft, the faster the liquid flow rate in the hose and cooling pipe. Multiple hoses are located in the inlet chamber and the cooling chamber respectively. The liquid in the inlet chamber and the cooling chamber can dissipate heat from the liquid in the hose, reducing the possibility of the liquid flowing into the cooling pipe heating up, thereby improving the heat dissipation performance of the canned pump. The connecting rods in the inlet chamber and the cooling chamber are staggered, so that the hoses at both ends of the cooling pipe are pressurized, making the liquid flow more smoothly. The roller is rotatably connected to the connecting rod. When the roller squeezes the hose, the friction between the roller and the hose causes the roller to rotate, reducing the possibility of damage to the roller and the hose due to friction.

[0012] Preferably, the liquid inlet chamber and the cooling chamber are respectively provided with a plurality of abutment blocks that can cooperate with the hoses, and the plurality of abutment blocks correspond to a plurality of hoses, with the outer surfaces of the plurality of hoses abutting against the corresponding abutment blocks.

[0013] By adopting the above technical solution, the setting of the abutment block plays a limiting role on one side of the inner ring of the hose, so that the deformation of the inner ring of the hose is reduced when the hose is squeezed, thereby reducing the possibility that the outer ring and inner ring of the hose will deform together when the roller squeezes the hose, resulting in the inability to generate a local vacuum in the hose; at the same time, it plays a limiting role in the position of the hose in the cooling chamber or water passage chamber, reducing the possibility of the hose axis position deviation.

[0014] Preferably, it also includes a scraping assembly for scraping inside the cooling pipe. The scraping assembly includes several scraping rings, a sliding rod, and a driving component. The sliding rod is slidably connected inside the cooling pipe along its length. Several scraping rings are respectively disposed on the sliding rod. The driving component is used to drive the sliding rod to slide.

[0015] By adopting the above technical solution, the sliding rod is driven by the driving component to scrape the inner wall of the cooling pipe, and the liquid flow carries the scraper out of the cooling pipe, reducing the possibility of scale buildup on the inner wall of the cooling pipe. At the same time, the scraper plays a heat conduction role between the inner walls on both sides of the cooling pipe, increasing the heat dissipation of the outer wall of the pump body.

[0016] Preferably, the driving component includes two hinge rods and two arc blocks. The two arc blocks are respectively fixedly connected to the hoses on both sides of the cooling pipe. The two hinge rods correspond to the two arc blocks respectively. The two ends of the two hinge rods in the length direction are respectively hinged to the sliding rod and the arc block.

[0017] By adopting the above technical solution, when the roller squeezes the hose and deforms it, the arc-shaped tube on the hose displaces, thereby driving the hinge rod to move, causing the sliding rod to move to the other side. The movement of the sliding rod causes the hinge rod and arc-shaped tube on the other side to displace, thereby causing the hose on the other side to spring back. That is, the pressure deformation of the hose causes the sliding rod to move and scrape off the scale on the inner wall of the cooling pipe. At the same time, it causes the hose on the other side of the cooling pipe to spring back and recover, reducing the possibility of slow or no rebound speed of the hose, thereby reducing the possibility of slow or no water flow in the cooling pipe.

[0018] Preferably, the shielding cover is provided with filter screens at both ends, and the multiple connecting rods are provided with scraping blocks, and the multiple scraping blocks abut against the filter screens on both sides.

[0019] By adopting the above technical solution, the filter screen can reduce the possibility of impurities entering the shielding cover and causing damage to the shielding cover and hollow rotating shaft. The rotation of the connecting rod can cause the scraper to clean the surface of the filter screen, reducing the accumulation of impurities on the filter screen surface and the possibility that liquid cannot flow into the shielding cover.

[0020] Preferably, a partition is provided inside the liquid inlet chamber, the hollow rotating shaft passes through and is rotatably connected to the partition, and a liquid flow gap is provided between the partition and the liquid inlet chamber.

[0021] By adopting the above technical solution, the baffle plate positions the hollow shaft within the liquid inlet chamber, reducing the possibility of the hollow shaft being eccentric. Furthermore, the liquid flowing to the other side of the baffle plate is filtered through the flow gap between the baffle plate and the liquid inlet chamber, reducing the possibility of large particles entering the roller and thus reducing the possibility of wear on the roller and hose.

[0022] The main technical effects of this invention are reflected in the following aspects:

[0023] 1. This invention uses a hose and rollers. The rollers slide and squeeze the hose, causing the liquid inside the hose to be squeezed into the cooling pipe in the direction of the rollers' rolling. After the liquid inside the hose is expelled, a partial vacuum is created, drawing the liquid from the other side into the hose. By orderly pressing multiple hoses, the liquid inside the multiple hoses circulates, cooling and dissipating heat on the outer surface of the pump body, thus increasing the heat dissipation of the shielded pump.

[0024] 2. This invention incorporates connecting rods on a hollow rotating shaft, with rollers connected to the connecting rods. This allows the hollow rotating shaft of the canned pump to rotate, causing the rollers to compress the flexible hoses. The faster the hollow rotating shaft rotates, the faster the liquid flow rate in the hoses and cooling pipes. Multiple hoses are located in the inlet chamber and cooling chamber respectively, allowing the liquid in the inlet and cooling chambers to dissipate heat from the hoses, reducing the likelihood of the liquid flowing into the cooling pipes generating heat and thus improving the heat dissipation performance of the canned pump. Furthermore, the connecting rods in the inlet and cooling chambers are staggered, ensuring that the hoses at both ends of the cooling pipes are pressurized, resulting in smoother liquid flow.

[0025] 3. This invention, by setting a driving component, causes the hose to deform when the roller squeezes it, resulting in displacement of the arc-shaped tube on the hose. This displacement drives the hinge rod to move, causing the sliding rod to move to the other side. The movement of the sliding rod causes displacement of the hinge rod and arc-shaped tube on the other side, thereby causing the hose on the other side to spring back. In other words, the pressure deformation of the hose causes the sliding rod to move, scraping away the scale on the inner wall of the cooling pipe. At the same time, it causes the hose on the other side of the cooling pipe to spring back, reducing the possibility of slow or no rebound speed of the hose, thereby reducing the possibility of slow or no water flow in the cooling pipe. Attached Figure Description

[0026] Figure 1 is a schematic diagram of the overall structure of an embodiment of this application.

[0027] Figure 2 is a schematic diagram of the pump body structure according to an embodiment of this application.

[0028] Figure 3 is an enlarged view along point A in Figure 2.

[0029] Figure 4 is a schematic diagram of the liquid inlet chamber structure in an embodiment of this application.

[0030] Figure 5 is a schematic diagram of the cooling cavity structure according to an embodiment of this application.

[0031] Figure 6 is an enlarged view along point B in Figure 5.

[0032] Figure 7 is a schematic diagram of the cooling device structure according to an embodiment of this application.

[0033] Figure 8 is a schematic diagram of the cooling pipe structure according to an embodiment of this application.

[0034] Figure 9 is a schematic diagram of the scraping component structure according to an embodiment of this application.

[0035] Figure 10 is an enlarged view along point C in Figure 9.

[0036] Explanation of reference numerals in the attached drawings: 1. Pump body; 11. Inlet chamber; 111. Baffle plate; 112. Flow gap; 12. Cooling chamber; 13. Stator; 14. Hollow rotating shaft; 141. Water inlet hole; 15. Shielding cover; 151. Filter screen; 16. Impeller; 2. Cooling device; 21. Cooling pipe; 22. Conveying assembly; 221. Hose; 222. Roller; 223. Connecting rod; 23. Abutment block; 24. Scraping assembly; 241. Scraper ring; 242. Sliding rod; 25. Driving component; 251. Hinge rod; 252. Arc block. Detailed Implementation

[0037] The present application will be further described in detail below with reference to Figures 1-10, so that the technical solution of the present application can be more easily understood and mastered.

[0038] This application discloses a self-circulating cooling shielded pump.

[0039] Referring to Figures 1 and 2, a self-circulating cooling shielded pump of this embodiment includes a pump body 1 and a cooling device 2. The pump body 1 has an inlet chamber 11 and a cooling chamber 12. A stator 13 is fixedly connected inside the pump body 1. A shield 15 is fixedly connected inside the pump body 1. The two ends of the shield 15 in the axial direction are respectively connected to the inlet chamber 11 and the cooling chamber 12. The stator 13 is located outside the shield 15. A hollow shaft 14 is coaxially and rotatably connected inside the shield 15. Impellers 16 are coaxially and fixedly connected to both ends of the hollow shaft 14. A water inlet hole 141 is opened on the hollow shaft 14. The water inlet hole 141 is connected to the cooling chamber 12 through the hollow shaft 14.

[0040] Referring to Figures 1 and 4, the cooling device 2 is used to cool the pump body 1. The cooling device 2 includes multiple cooling pipes 21 and a conveying assembly 22. The multiple cooling pipes 21 are evenly distributed along the outer surface of the pump body 1. Two cooling pipes 21 are connected to the liquid inlet chamber 11. The conveying assembly 22 is used to convey the liquid in the liquid inlet chamber 11 to the multiple cooling pipes 21. The conveying assembly 22 includes multiple hoses 221 and multiple rollers 222. One end of the multiple hoses 221 is fixedly connected to the multiple cooling pipes 21 in the axial direction. The other end of the multiple hoses 221 is fixedly connected to adjacent cooling pipes 21 in the axial direction. The two hoses 221 at both ends of the cooling pipes 21 are connected to different cooling pipes 21 on adjacent sides. The multiple hoses 221 are located in the liquid inlet chamber 11 and the cooling chamber 12, and the multiple hoses 221 are evenly distributed around the circumferential side of the hollow rotating shaft 14.

[0041] Referring to Figures 2 and 4, multiple rollers 222 are slidably connected to the pump body 1 around the circumferential side of the hollow shaft 14. Multiple connecting rods 223 are fixedly connected to the circumferential side of the hollow shaft 14, each corresponding to one of the rollers 222. The rollers 222 are rotatably connected to their respective connecting rods 223 along the axial direction of the hollow shaft 14. The connecting rods 223 located in the liquid inlet chamber 11 and the connecting rods 223 located in the cooling chamber 12 are staggered. Multiple hoses 221 are located along the movement path of the rollers 222. When a roller 222 slides onto a hose 221, the hose 221 is compressed and deformed. When a roller 222 slides out of the hose 221's range, the hose 221 springs back to its original shape.

[0042] Referring to Figures 2 and 5, when the impeller 16 rotates in the cooling chamber 12, it drives the liquid to flow from the inlet chamber 11 through the shield 15 and the inlet hole into the cooling chamber 12, cooling the inner side of the pump body 1 and the hollow rotating shaft 14. The liquid in the inlet chamber 11 is then transported to multiple cooling pipes 21 by the conveying assembly 22. The cooling pipes 21 themselves can increase the heat dissipation area of ​​the pump body 1. The liquid then flows through the cooling pipes 21 to dissipate heat, enhancing the cooling of the outer side of the pump body 1. This allows the canned pump to dissipate heat from both its inner and outer surfaces during operation, increasing the heat dissipation performance of the canned pump.

[0043] Referring to Figures 2, 3, and 7, by setting a connecting rod 223 on the hollow rotating shaft 14 and rotatably connecting the roller 222 to the connecting rod 223, the hollow rotating shaft 14 of the canned pump moves, causing the roller 222 to slide around the central axis of the hollow rotating shaft 14, compressing the hose 221. This compresses the liquid inside the hose 221 into the cooling pipe 21 in the rolling direction of the roller 222. After the liquid inside the hose 221 is expelled, a partial vacuum is created, drawing liquid from the other side into the hose 221. By orderly compressing multiple hoses 221, the liquid inside multiple hoses 221 circulates, cooling the outer surface of the pump body 1 and increasing the heat dissipation of the canned pump. The multiple hoses 221 are respectively located in the liquid inlet chamber 11 and the cooling chamber 12. Inside, the liquid in the inlet chamber 11 and the heat dissipation chamber can dissipate heat from the liquid in the hose 221, reducing the possibility of the liquid flowing into the cooling pipe 21 heating up, thereby improving the heat dissipation performance of the shielded pump. The faster the rotation speed of the hollow rotating shaft 14, the faster the liquid flow rate in the hose 221 and the cooling pipe 21. The connecting rods 223 in the inlet chamber 11 and the cooling chamber 12 are staggered, so that the hoses 221 at both ends of the cooling pipe 21 are pressurized, making the liquid flow smoother. The roller 222 is rotatably connected to the connecting rod 223. When the roller 222 squeezes the hose 221, the friction between the roller 222 and the hose 221 causes the roller 222 to rotate, reducing the possibility of damage to the roller 222 and the hose 221 due to friction.

[0044] Referring to Figures 4 and 6, multiple abutment blocks 23 that can mate with hoses 221 are fixedly connected in the liquid inlet chamber 11 and the cooling chamber 12, respectively. Each abutment block 23 has anti-slip textures, and each abutment block 23 corresponds to a multiple hose 221. The outer surfaces of the multiple hoses 221 abut against their respective abutment blocks 23. The abutment blocks 23 limit the inner ring side of the hose 221, reducing the deformation of the inner ring side of the hose 221 when compressed. This reduces the possibility that a partial vacuum cannot be generated inside the hose 221 due to the deformation of both the outer and inner rings of the hose 221 when compressed by the roller 222. Simultaneously, they limit the position of the hose 221 in the cooling chamber 12 or the water passage chamber, reducing the possibility of axial displacement of the hose 221.

[0045] Referring to Figures 8-10, the system also includes a scraping assembly 24. The scraping assembly 24 is used for scraping inside the cooling pipe 21. The scraping assembly 24 includes several scraping rings 241, a sliding rod 242, and a driving member 25. The sliding rod 242 is slidably connected inside the cooling pipe 21 along its length. The scraping rings 241 are fixedly connected to the sliding rod 242 and are evenly distributed along its length. The driving member 25 drives the sliding rod 242 to slide. By driving the sliding rod 242 with the driving member 25, the scraping rings 241 scrape the inner wall of the cooling pipe 21, and the liquid flow carries the scraping rings out of the cooling pipe 21, reducing the possibility of scale buildup on the inner wall of the cooling pipe 21. Simultaneously, the scraping rings 241 conduct heat between the inner walls on both sides of the cooling pipe 21, increasing heat dissipation to the outer wall of the pump body 1.

[0046] Referring to Figures 8-10, the driving component 25 includes two hinge rods 251 and two arc blocks 252. The two arc blocks 252 are fixedly connected to the hoses 221 on both sides of the cooling pipe 21. The two hinge rods 251 correspond to the two arc blocks 252 respectively. The two ends of the two hinge rods 251 in the length direction are respectively hinged to the sliding rod 242 and the arc blocks 252. When the roller 222 squeezes the hose 221 and deforms it, the arc-shaped tube on the hose 221 is displaced, which drives the hinge rod 251 to move, causing the sliding rod 242 to move to the other side. When the sliding rod 242 moves, it causes the hinge rod 251 and the arc-shaped tube on the other side to displace, thereby causing the hose 221 on the other side to spring back. That is, the pressure deformation of the hose 221 causes the sliding rod 242 to move and scrape off the scale on the inner wall of the cooling pipe 21. At the same time, it causes the hose 221 on the other side of the cooling pipe 21 to spring back and recover, reducing the possibility that the hose 221 will spring back slowly or not at all, thereby reducing the possibility that the water flow rate in the cooling pipe 21 will be slow or not flowing.

[0047] Referring to Figures 2 and 5, filter screens 151 are fixedly connected to both ends of the shield 15, and scraping blocks are fixedly connected to multiple connecting rods 223, with the scraping blocks abutting against the filter screens 151 on both sides. The filter screens 151 reduce the possibility of impurities entering the shield 15 and damaging the shield 15 and hollow rotating shaft 14. The rotation of the connecting rods 223 causes the scraping blocks to clean the surface of the filter screens 151, reducing the accumulation of impurities on the surface of the filter screens 151 and preventing liquid from flowing into the shield 15.

[0048] Referring to Figures 3 and 6, a partition 111 is fixedly connected inside the liquid inlet chamber 11. A hollow rotating shaft 14 passes through and is rotatably connected to the partition 111. A flow gap 112 is provided between the partition 111 and the liquid inlet chamber 11. By setting the partition 111, the position of the hollow rotating shaft 14 in the liquid inlet chamber 11 is positioned, reducing the possibility of the hollow rotating shaft 14 being eccentric. Through the flow gap 112 between the partition 111 and the liquid inlet chamber 11, the liquid flowing to the other side of the partition 111 is filtered once, reducing the possibility of large particles entering the movement path of the roller 222, thereby reducing the possibility of wear on the roller 222 and the hose 221.

[0049] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. A self-circulating cooling canned pump, characterized in that: The pump body (1) includes a pump body (1) and a cooling device (2). The pump body (1) has an inlet chamber (11) and a cooling chamber (12). The pump body (1) is equipped with a shield (15) that connects the inlet chamber (11) and the cooling chamber (12). A hollow shaft (14) is rotatably connected inside the shield (15). Several impellers (16) are provided at both ends of the hollow shaft (14). The cooling device (2) is used to cool the pump body (1). The cooling device (2) includes multiple cooling pipes (21) and a conveying assembly (22). The multiple cooling pipes (21) are evenly distributed along the outer surface of the pump body (1). Two of the cooling pipes (21) are connected to the inlet chamber (11). The conveying assembly (22) is used to convey the liquid in the inlet chamber (11) to the multiple cooling pipes (21).

2. The self-circulating cooling canned pump according to claim 1, characterized in that: The conveying assembly (22) includes multiple hoses (221) and multiple rollers (222). One end of each hose (221) is fixedly connected to multiple cooling pipes (21) along its axial direction, and the other end of each hose (221) is fixedly connected to an adjacent cooling pipe (21). The multiple rollers (222) are slidably connected to the pump body (1). The multiple hoses (221) are located on the movement path of the multiple rollers (222). When the rollers (222) slide onto the hoses (221), the hoses (221) are squeezed and deformed.

3. A self-circulating cooling canned pump according to claim 2, characterized in that: The multiple hoses (221) are located in the liquid inlet chamber (11) and the cooling chamber (12) respectively, and the multiple hoses (221) are evenly distributed around the circumferential side of the hollow rotating shaft (14). The hollow rotating shaft (14) is provided with multiple connecting rods (223), and the multiple connecting rods (223) correspond to multiple rollers (222). The multiple connecting rods (223) are respectively arranged on the hollow rotating shaft (14), and the multiple rollers (222) are rotatably connected to the connecting rods (223). The multiple connecting rods (223) located in the liquid inlet chamber (11) and the multiple connecting rods (223) located in the cooling chamber (12) are staggered.

4. A self-circulating cooling canned pump according to claim 3, characterized in that: The liquid inlet chamber (11) and the cooling chamber (12) are respectively provided with a plurality of abutment blocks (23) that can cooperate with the hoses (221). The plurality of abutment blocks (23) correspond to a plurality of hoses (221), and the outer surfaces of the plurality of hoses (221) abut against the corresponding abutment blocks (23).

5. A self-circulating cooling canned pump according to claim 2, characterized in that: It also includes a scraping assembly (24), which is used for scraping inside the cooling pipe (21). The scraping assembly (24) includes several scraping rings (241), a sliding rod (242), and a driving member (25). The sliding rod (242) is slidably connected inside the cooling pipe (21) along the length direction of the cooling pipe (21). Several scraping rings (241) are respectively disposed on the sliding rod (242). The driving member (25) is used to drive the sliding rod (242) to slide.

6. A self-circulating cooling canned pump according to claim 5, characterized in that: The drive component (25) includes two hinge rods (251) and two arc blocks (252). The two arc blocks (252) are fixedly connected to the hoses (221) on both sides of the cooling pipe (21). The two hinge rods (251) correspond to the two arc blocks (252) respectively. The two ends of the two hinge rods (251) in the length direction are respectively hinged to the sliding rod (242) and the arc blocks (252).

7. A self-circulating cooling canned pump according to claim 3, characterized in that: The shield (15) is provided with filter screens (151) at both ends, and a plurality of connecting rods (223) are provided with scraping blocks, and the plurality of scraping blocks abut against the filter screens (151) on both sides respectively.

8. A self-circulating cooling canned pump according to claim 7, characterized in that: The liquid inlet chamber (11) is provided with a partition (111), the hollow rotating shaft (14) passes through and is rotatably connected to the partition (111), and a flow gap (112) is provided between the partition (111) and the liquid inlet chamber (11).

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