Energy-saving permanent magnet submersible centrifugal pump

Abstract

The invention discloses an energy-saving permanent magnet submersible centrifugal pump, and relates to the technical field of centrifugal pumps, the energy-saving permanent magnet submersible centrifugal pump comprises a permanent magnet motor, the output end of the permanent magnet motor is provided with a pump body, the pump body is connected with a drainage pipe, the drainage pipe is provided with a driving structure, and the top of the pump body is connected with a connecting pipe; a first protective cover is fixed to the connecting pipe, a rotating hole is formed in the first protective cover, the impeller shaft is installed in the rotating hole in the first protective cover under the cooperation of a bearing, and when a feeding channel of the pump is blocked by blockages, after the water inlet pipe is adsorbed upwards by internal suction force, under the cooperation of a driving structure, the impeller shaft is driven by the impeller shaft to rotate. Through power output of the permanent magnet motor, rotary separation of blockages can be achieved, smoothness of the feeding channel can be effectively maintained, idling energy consumption is reduced, and more energy is saved.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal pumps, and in particular to an energy-saving permanent magnet submersible centrifugal pump. Background Art

[0002] Submersible multistage centrifugal pumps are made of stainless steel and are suitable for conveying clean water in wells, small ponds and irrigation systems. Two mechanical seals ensure a long service life and high reliability. After the capacitor is installed in the pump unit, there is no need to set up a starter box, making installation easier; A submersible centrifugal pump with announcement number CN 221442871 U in the existing document relates to the technical field of centrifugal pumps. The centrifugal pump includes a motor, a pump casing, a water outlet cylinder, and a water inlet cylinder. The upper surface of the pump casing is penetrated and fixedly connected with a motor, the lower surface of the pump casing is penetrated and fixedly connected with a water inlet cylinder, the side wall of the pump casing is penetrated and fixedly connected with a water outlet cylinder, the output end of the motor located in the pump casing is fixedly connected with a pump shaft, an impeller is arranged on the pump shaft, a vibration cylinder is fixedly connected with the lower surface of the water inlet cylinder, a filter screen is arranged in the vibration cylinder, and also includes a vibration component and a replacement component. The vibration component is arranged in the vibration cylinder, and is used to drive the filter screen to vibrate to prevent plankton from being attached to the filter screen all the time. The replacement component is arranged on the vibration component, and is used to replace the filter screen. The utility model prevents plankton from being attached to the filter screen and affecting the normal operation of the water pump through the vibration component; the filter screen can be quickly installed and disassembled by replacing the component; Since the working environment of submersible centrifugal pumps is generally located underwater, a large amount of debris will enter the suction and discharge ports during pumping operations. Existing submersible centrifugal pumps will cause blockage of the suction and discharge ports, resulting in negative pressure idling of the centrifugal pump, which consumes a lot of energy and is prone to burning. It is impossible to perform pumping and discharge work continuously, and the liquid inlet needs to be frequently cleaned and slag discharged, affecting operating efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide an energy-saving permanent magnet submersible centrifugal pump to solve the following technical problems: during pumping and drainage operations, a large amount of debris will enter the suction and discharge ports, causing blockage of the suction and discharge ports, resulting in negative pressure idling of the centrifugal pump, consuming a large amount of energy, and being easily burned. The pumping and drainage work cannot be performed continuously, and the liquid inlet needs to be frequently cleaned and slag removed, affecting the operating efficiency. When the feed channel of the pump is blocked by an obstruction, the water inlet pipe is adsorbed upward by the internal suction force. With the cooperation of the driving structure, the power output of the permanent magnet motor can realize the rotation and separation of the obstruction, and the feed channel can be effectively maintained unobstructed, reducing idling energy consumption and saving more energy. At the same time, it can avoid damage caused by high-pressure idling of the pump and better protect the centrifugal pump body structure.

[0004] The purpose of the present invention can be achieved through the following technical solutions: An energy-saving permanent magnet submersible centrifugal pump comprises a permanent magnet motor, a pump body is installed at the output end of the permanent magnet motor, a drain pipe is connected to the pump body, and a driving structure is installed on the drain pipe; A support cover, the support cover is mounted on the outer bottom side of the pump body; A driving structure, wherein the driving structure comprises an impeller shaft, wherein the impeller shaft is mounted on a side wall of the pump body through a sealed bearing, an impeller is fixed on the bottom outer surface of the impeller shaft, the impeller is located in the pump body, and the top end of the impeller shaft is connected to the rotating shaft of the permanent magnet motor through a coupling; The top of the pump body is connected with a connecting pipe, a first protective cover is fixed on the connecting pipe, a rotating hole is arranged in the first protective cover, and the impeller shaft is installed in the rotating hole in the first protective cover with the cooperation of the bearing; A driving gear is installed on the outer side of the top of the impeller shaft, a driving shaft is installed inside the first protective cover through a bearing, a first driving gear is installed on the top of the driving shaft, and the first driving gear is connected to the driving gear through a first internal tooth belt transmission; As a further solution of the present invention: a connecting cylinder is fixedly connected to the bottom end of the driving shaft, and a blocking strip is vertically arranged on the inner wall of the connecting cylinder; As a further solution of the present invention: the bottom of the pump body is connected to a connecting pipe, a fixed inner ring is fixed on the inner wall of the bottom of the connecting pipe, a movable pipe is movably arranged inside the fixed inner ring, a matching ring is fixed on the outer side of the top of the movable pipe, and a spring is directly fixed to the matching ring and the fixed inner ring. After the feed channel at the bottom of the water inlet pipe is closed, when the impeller shaft continues to operate, a negative pressure environment is easily generated in the pump body, causing the movable tube to be adsorbed and move upward, thereby stretching the spring. When the fluid channel at the bottom of the water inlet pipe is connected, the movable tube can be pushed downward under the contraction operation of the spring, causing the second fixed plate and the water inlet pipe to move downward as a whole, and the limit block and the baffle bar are dislocated and separated up and down, thereby stopping the drive of the movable shaft.

[0005] As a further solution of the present invention: a positioning ring is fixed inside the movable tube, a movable rod is inserted inside the positioning ring, the bottom end of the movable rod is connected to a second matching gear, a guide ring is arranged outside the bottom of the movable tube, a water inlet pipe is rotatably arranged at the bottom of the movable tube, and a guide groove is arranged inside the water inlet pipe, the guide ring is arranged in the guide groove of the inner wall of the water inlet pipe, a protective rod is fixed on the circumferential surface of the second matching gear, and the middle part of the protective rod is fixed to the bottom end of the water inlet pipe; As a further solution of the present invention: a second fixing plate is fixed on the outside of the movable tube, a second protective cover is buckled on the bottom of the second fixing plate, a second matching gear is sleeved on the outer wall of the water inlet pipe, a movable shaft is rotatably installed in the second fixing plate, a second driving gear is installed on the bottom of the movable shaft, the second driving gear and the second matching gear are connected through a second internal tooth belt transmission, the top of the movable shaft is deeply set inside the connecting tube, a limiting block is set on the top of the movable shaft, the limiting block and the stop bar are staggered up and down, after the second fixing plate moves upward, the movable shaft is driven to move upward, so that the limiting block at the top of the movable shaft moves upward along the inner wall of the connecting tube, when the limiting block moves to a position parallel to the stop bar inside the connecting tube, the movable shaft is driven to rotate under the rotation cooperation of the connecting tube; Among them, since a driving gear is arranged on the outer side of the impeller shaft, when the permanent magnet motor drives the impeller shaft to rotate, it can drive the driving gear to rotate, and under the cooperation of the first internal tooth belt, it can drive the first driving gear to rotate, thereby realizing the rotation of the driving shaft and the rotation of the connecting cylinder; When the movable shaft is in the initial position, the connecting cylinder is idle, and the baffle bar is not in contact with the limit block. When the movable shaft moves upward, the limit block is pushed to move upward. When the limit block enters the rotation range of the baffle bar, it can drive the limit block to rotate, thereby realizing the rotation of the movable shaft. With the cooperation of the second driving gear and the second internal toothed belt, the second matching gear can be driven to rotate. With the cooperation of the guide ring, the rotation of the water inlet pipe can be realized. When the water inlet pipe rotates, the debris adsorbed on the bottom of the protective rod can be rotated out to ensure the smooth flow of fluid into the channel at the protective rod position.

[0006] As a further solution of the present invention: a first protective plate is arranged on the bottom side of the first protective cover, a second protective plate is arranged on the top side of the second fixed plate, the first protective plate and the second protective plate are arranged in a staggered manner, the outer side wall of the second protective plate is arranged vertically and parallel to the inner side wall of the first protective plate, so that when the water inlet pipe moves upward, the second protective plate can move upward, and with the cooperation of the first protective plate and the second anti-slip plate, the motion interference of the drive shaft and the movable shaft can be reduced, thereby ensuring effective transmission; As a further solution of the present invention: a shunt pipe is connected to the drain pipe, a linkage rod is arranged in the shunt pipe, a sealing plate is arranged on the top of the linkage rod, and the sealing plate is arranged at the connecting buckle position of the drain pipe and the shunt pipe, a limit rod is arranged in the middle of the linkage rod, and the limit rod is used to support and limit the linkage rod, and a first fixed plate is installed on the outer wall of the second protective cover, and the bottom end of the linkage rod is fixed on the top of the first fixed plate. When the feed channel of the pump is blocked by an obstruction, the first fixed plate is driven to move upward, and the linkage rod is pushed upward to lift up the sealing plate blocked at the connection between the shunt pipe and the drain pipe, so as to realize the connection between the outside and the drain pipe. Since the drain pipe is the discharge position of the pump body, when the liquid inlet direction of the pump body is blocked, it is easy to cause liquid reflux under the action of suction. When blocking, the drain pipe can be connected with the external environment, liquid reflux can be avoided, burning of the pump can be avoided, and the centrifugal pump can be better protected.

[0007] Beneficial effects of the present invention: When there is a blockage in the feed channel of the pump, the water inlet pipe is sucked upward by the internal suction force. With the cooperation of the driving structure, the power output of the permanent magnet motor can realize the rotation and separation of the blockage, which can effectively maintain the smooth flow of the feed channel, reduce idling energy consumption, save more energy, and avoid damage caused by high-pressure idling of the pump, while better protecting the centrifugal pump body structure; When the feed channel of the pump is blocked by an obstruction, the second fixed plate is driven to move upward, thereby realizing the upward movement of the second protective cover, so that the first fixed plate follows the second protective cover to move upward, which can push the linkage rod to move upward, and lift up the blocking plate blocked at the connection between the diverter pipe and the drain pipe, so as to realize the connection between the outside and the drain pipe. Since the drain pipe is the discharge position of the pump body, when the liquid inlet direction of the pump body is blocked, it is easy to cause liquid reflux under the action of suction. When blocked, the drain pipe can be connected with the external environment, which can avoid liquid reflux, avoid burning of the pump, and better protect the centrifugal pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the overall first three-dimensional structure of the present invention; Figure 2 is a schematic diagram of the overall second three-dimensional structure of the present invention; Figure 3 It is a schematic diagram of the pump structure of the present invention; Figure 4 This is a schematic diagram of the internal structure of the pump body. Figure 5 It is a schematic diagram of the pump structure; Figure 6 is a schematic diagram of the driving structure of the first driving gear; Figure 7 It is a schematic diagram of the cutaway structure of the driving structure; Figure 8 It is a schematic diagram of the drainage pipe structure; Fig. 9 It is a schematic diagram of the transmission structure of the drive shaft and the movable shaft; Fig.10 It is a schematic diagram of the position structure of the blocking plate in the drainage pipe; In the figure: 1, permanent magnet motor, 2, pump body, 3, drive structure, 4, support cover, 5, drain pipe, 6, first protective cover, 7, drive shaft, 8, first drive gear, 9, first protective plate, 10, second protective plate, 11, impeller shaft, 12, motor shaft, 13, driving gear, 14, first internal tooth belt, 15, second protective cover, 16, linkage rod, 17, first fixed plate, 18, protective rod, 19, second fixed plate, 20, Connecting pipe, 21, impeller, 22, connecting tube, 23, baffle, 24, limit block, 25, movable shaft, 26, second drive gear, 27, second internal tooth belt, 28, water inlet pipe, 29, second matching gear, 30, movable rod, 31, guide ring, 32, positioning ring, 33, fixed inner ring, 34, spring, 35, connecting pipe, 36, matching ring, 37, diverter pipe, 38, limit rod, 39, blocking plate, 40, movable pipe. DETAILED DESCRIPTION

[0009] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0010] This embodiment provides an energy-saving permanent magnet submersible centrifugal pump. Figure 1-10 As shown, it comprises: a permanent magnet motor 1, a pump body 2 is installed at the output end of the permanent magnet motor 1, a drain pipe 5 is connected to the pump body 2, and a driving structure 3 is installed on the drain pipe 5; A support cover 4, wherein the support cover 4 is mounted on the outer bottom side of the pump body 2; A driving structure 3, wherein the driving structure 3 comprises an impeller shaft 11, wherein the impeller shaft 11 is mounted on a side wall of the pump body 2 via a sealed bearing, an impeller 21 is fixed on the bottom outer surface of the impeller shaft 11, and the impeller 21 is located in the pump body 2, and the top end of the impeller shaft 11 is connected to the rotating shaft of the permanent magnet motor 1 via a coupling; When working, the permanent magnet motor 1 drives the motor shaft 12 to rotate, which can realize the driving of the impeller shaft 11. When the impeller shaft 11 rotates, the impeller 21 is driven to rotate. Under the cooperation of the impeller 21, the fluid is sucked in through the first protective cover 6 at the bottom of the pump body 2 and discharged through the drain pipe 5, thereby realizing the pumping operation of the fluid; The top of the pump body 2 is connected with a connecting pipe 20, and a first protective cover 6 is fixed on the connecting pipe 20. A rotating hole is provided in the first protective cover 6, and the impeller shaft 11 is installed in the rotating hole in the first protective cover 6 with the cooperation of the bearing; A driving gear 13 is installed on the outer side of the top of the impeller shaft 11, a driving shaft 7 is installed inside the first protective cover 6 through a bearing, a first driving gear 8 is installed on the top of the driving shaft 7, and the first driving gear 8 is connected to the driving gear 13 through a first internal tooth belt 14; A connecting tube 22 is fixedly connected to the bottom end of the driving shaft 7, and a blocking bar 23 is vertically arranged on the inner wall of the connecting tube 22; The bottom of the pump body 2 is connected with a connecting pipe 35, and a fixed inner ring 33 is fixed on the inner wall of the bottom of the connecting pipe 35. A movable pipe 40 is movably arranged inside the fixed inner ring 33, and a matching ring 36 is fixed on the outer side of the top of the movable pipe 40. The matching ring 36 and the fixed inner ring 33 are directly fixed with a spring 34; A positioning ring 32 is fixed inside the movable tube 40, and a movable rod 30 is inserted inside the positioning ring 32. The bottom end of the movable rod 30 is connected to the second matching gear 29. A guide ring 31 is provided on the outer side of the bottom of the movable tube 40. The bottom of the movable tube 40 is rotatably provided with a water inlet pipe 28, and a guide groove is provided inside the water inlet pipe 28. The guide ring 31 is arranged in the guide groove of the inner wall of the water inlet pipe 28. A protective rod 18 is fixed on the circumferential surface of the second matching gear 29, and the middle part of the protective rod 18 is fixed to the bottom end of the water inlet pipe 28. A second fixing plate 19 is fixed to the outside of the movable tube 40, a second protective cover 15 is buckled on the bottom of the second fixing plate 19, a second matching gear 29 is sleeved on the outer wall of the water inlet pipe 28, a movable shaft 25 is rotatably installed in the second fixing plate 19, a second driving gear 26 is installed at the bottom of the movable shaft 25, and the second driving gear 26 is connected to the second matching gear 29 through a second internal tooth belt 27; The top end of the movable shaft 25 is deeply arranged inside the connecting tube 22, and a limit block 24 is arranged on the top end of the movable shaft 25. The limit block 24 and the stop bar 23 are arranged in an up-down staggered manner. A first protective plate 9 is disposed on the bottom side of the first protective cover 6, and a second protective plate 10 is disposed on the top side of the second fixing plate 19. The first protective plate 9 and the second protective plate 10 are staggered, and the outer side wall of the second protective plate 10 is vertically parallel to the inner side wall of the first protective plate 9. When the fluid material is sucked in through the feed port at the bottom of the water inlet pipe 28, a plurality of protection rods 18 are provided at the bottom of the water inlet pipe 28, which can block the solids when the fluid enters the pump body 2, and can prevent the sundries from mixing into the pump body 2 and causing the centrifugal pump to jam; As debris accumulates at the bottom port of the water inlet pipe 28, the feed channel will gradually shrink, and eventually the feed channel will be completely closed; After the feed channel at the bottom of the water inlet pipe 28 is closed, when the impeller shaft 11 continues to operate, a negative pressure environment is easily generated in the pump body 2, so that the movable tube 40 is adsorbed and moves upward, thereby stretching the spring 34; When the movable pipe 40 is adsorbed and moves upward, it drives the water inlet pipe 28 to move upward; During the movement of the movable tube 40, the second fixed plate 19 is driven to move upward, so that the second fixed plate 19 and the water inlet pipe 28 move upward synchronously; After the second fixing plate 19 moves upward, the movable shaft 25 is driven to move upward, so that the limit block 24 at the top of the movable shaft 25 moves upward along the inner wall of the connecting tube 22. When the limit block 24 moves to a position parallel to the stop bar 23 inside the connecting tube 22, the movable shaft 25 is driven to rotate in cooperation with the rotation of the connecting tube 22. Among them, since the driving gear 13 is arranged on the outer side of the impeller shaft 11, when the permanent magnet motor 1 is operated to drive the impeller shaft 11 to rotate, the driving gear 13 can be driven to rotate, and under the cooperation of the first internal tooth belt 14, the first driving gear 8 can be driven to rotate, thereby realizing the rotation of the driving shaft 7 and the rotation of the connecting cylinder 22; When the movable shaft 25 is in the initial position, the connecting cylinder 22 is idle, and the blocking bar 23 is not in contact with the limit block 24. When the movable shaft 25 moves upward, the limit block 24 is pushed to move upward. When the limit block 24 enters the rotation range of the blocking bar 23, it can drive the limit block 24 to rotate, thereby realizing the rotation of the movable shaft 25. Under the cooperation of the second driving gear 26 and the second internal tooth belt 27, the second matching gear 29 can be driven to rotate. Under the cooperation of the guide ring 31, the rotation of the water inlet pipe 28 can be realized. When the water inlet pipe 28 rotates, the debris adsorbed on the bottom of the protective rod 18 can be rotated and separated, ensuring the smooth flow of the fluid entering the channel at the position of the protective rod 18; When the fluid channel at the bottom of the water inlet pipe 28 is connected, the spring 34 contracts to push the movable pipe 40 downward, so that the second fixed plate 19 and the water inlet pipe 28 move downward as a whole, and the limit block 24 and the stop bar 23 are dislocated and separated up and down, and the driving of the movable shaft 25 is stopped; When there is an obstruction blocking the feed channel of the pump, the water inlet pipe 28 is sucked upward by the internal suction force. With the cooperation of the driving structure 3, the power output of the permanent magnet motor 1 can be used to rotate and disengage the obstruction, thereby effectively maintaining the smooth flow of the feed channel, avoiding damage caused by the high-pressure idling of the pump, and better protecting the centrifugal pump body structure.

[0011] The drainage pipe 5 is connected to a shunt pipe 37, a linkage rod 16 is arranged in the shunt pipe 37, a blocking plate 39 is arranged on the top of the linkage rod 16, and the blocking plate 39 is arranged at the connection buckle position between the drainage pipe 5 and the shunt pipe 37; A limiting rod 38 is provided in the middle of the linkage rod 16, and the limiting rod 38 is used to support and limit the linkage rod 16; A first fixing plate 17 is installed on the outer side wall of the second protective cover 15, and the bottom end of the linkage rod 16 is fixed on the top of the first fixing plate 17; When there is an obstruction in the feed channel of the pump, the second fixed plate 19 is driven to move upward, thereby realizing the upward movement of the second protective cover 15, so that the first fixed plate 17 moves upward with the second protective cover 15, and can push the linkage rod 16 to move upward, and lift up the blocking plate 39 blocked at the connection between the diverter pipe 37 and the drain pipe 5, so as to realize the connection between the outside and the drain pipe 5. Since the drain pipe 5 is the discharge position of the pump body 2, when the liquid inlet direction of the pump body 2 is blocked, it is easy to cause liquid reflux under the action of suction. When blocked, the drain pipe 5 can be connected with the external environment, which can avoid liquid reflux, avoid burning of the pump machine, and better protect the centrifugal pump.

[0012] When the energy-saving permanent magnet submersible centrifugal pump is used to pump and discharge liquid, the permanent magnet motor 1 drives the motor shaft 12 to rotate, which can realize the driving of the impeller shaft 11. When the impeller shaft 11 rotates, the impeller 21 is driven to rotate. The pump can work with the cooperation of the impeller 21 to suck the fluid through the first protective cover 6 at the bottom of the pump body 2 and discharge it through the drain pipe 5, thereby realizing the pumping and discharge operation of the fluid. When the fluid material is sucked in through the feed port at the bottom of the water inlet pipe 28, a plurality of protection rods 18 are provided at the bottom of the water inlet pipe 28, which can block the solids when the fluid enters the pump body 2, and can prevent the sundries from mixing into the pump body 2 and causing the centrifugal pump to jam; As debris accumulates at the bottom port of the water inlet pipe 28, the feed channel will gradually shrink, and eventually the feed channel will be completely closed; After the feed channel at the bottom of the water inlet pipe 28 is closed, when the impeller shaft 11 continues to operate, a negative pressure environment is easily generated in the pump body 2, so that the movable tube 40 is adsorbed and moves upward, thereby stretching the spring 34; When the movable pipe 40 is adsorbed and moves upward, it drives the water inlet pipe 28 to move upward; During the movement of the movable tube 40, the second fixed plate 19 is driven to move upward, so that the second fixed plate 19 and the water inlet pipe 28 move upward synchronously; After the second fixing plate 19 moves upward, the movable shaft 25 is driven to move upward, so that the limit block 24 at the top of the movable shaft 25 moves upward along the inner wall of the connecting tube 22. When the limit block 24 moves to a position parallel to the stop bar 23 inside the connecting tube 22, the movable shaft 25 is driven to rotate in cooperation with the rotation of the connecting tube 22. Among them, since the driving gear 13 is arranged on the outer side of the impeller shaft 11, when the permanent magnet motor 1 is operated to drive the impeller shaft 11 to rotate, the driving gear 13 can be driven to rotate, and under the cooperation of the first internal tooth belt 14, the first driving gear 8 can be driven to rotate, thereby realizing the rotation of the driving shaft 7 and the rotation of the connecting cylinder 22; When the movable shaft 25 is in the initial position, the connecting cylinder 22 is idle, and the blocking bar 23 is not in contact with the limit block 24. When the movable shaft 25 moves upward, the limit block 24 is pushed to move upward. When the limit block 24 enters the rotation range of the blocking bar 23, it can drive the limit block 24 to rotate, thereby realizing the rotation of the movable shaft 25. Under the cooperation of the second driving gear 26 and the second internal tooth belt 27, the second matching gear 29 can be driven to rotate. Under the cooperation of the guide ring 31, the rotation of the water inlet pipe 28 can be realized. When the water inlet pipe 28 rotates, the debris adsorbed on the bottom of the protective rod 18 can be rotated and separated, ensuring the smooth flow of the fluid entering the channel at the position of the protective rod 18; When the fluid channel at the bottom of the water inlet pipe 28 is connected, the spring 34 contracts to push the movable pipe 40 downward, so that the second fixed plate 19 and the water inlet pipe 28 move downward as a whole, and the limit block 24 and the stop bar 23 are dislocated and separated up and down, and the driving of the movable shaft 25 is stopped; When there is a blockage blocking the feed channel of the pump, after the water inlet pipe 28 is sucked upward by the internal suction force, with the cooperation of the driving structure 3, the power output of the permanent magnet motor 1 can realize the rotational separation of the blockage, which can effectively maintain the smooth flow of the feed channel, avoid the damage caused by the high-pressure idling of the pump, and better protect the centrifugal pump body structure; When there is an obstruction in the feed channel of the pump, the second fixed plate 19 is driven to move upward, thereby realizing the upward movement of the second protective cover 15, so that the first fixed plate 17 moves upward with the second protective cover 15, and can push the linkage rod 16 to move upward, and lift up the blocking plate 39 blocked at the connection between the diverter pipe 37 and the drain pipe 5, so as to realize the connection between the outside and the drain pipe 5. Since the drain pipe 5 is the discharge position of the pump body 2, when the liquid inlet direction of the pump body 2 is blocked, it is easy to cause liquid reflux under the action of suction. When blocked, the drain pipe 5 can be connected with the external environment, which can avoid liquid reflux, avoid burning of the pump machine, and better protect the centrifugal pump.

[0013] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An energy-saving permanent magnet submersible centrifugal pump, characterized in that: include: A permanent magnet motor (1), wherein a pump body (2) is installed at the output end of the permanent magnet motor (1), a drainage pipe (5) is connected to the pump body (2), and a driving structure (3) is installed on the drainage pipe (5); A support cover (4), wherein the support cover (4) is mounted on the outer bottom side of the pump body (2); A drive structure (3), the drive structure (3) comprising an impeller shaft (11), the impeller shaft (11) being mounted on a side wall of a pump body (2) via a sealed bearing, an impeller (21) being fixed on the bottom outer surface of the impeller shaft (11), the impeller (21) being located inside the pump body (2), and a top end of the impeller shaft (11) being connected to a rotating shaft of a permanent magnet motor (1) via a coupling; The top of the pump body (2) is connected to a connecting pipe (20), a first protective cover (6) is fixed to the connecting pipe (20), a rotating hole is provided in the first protective cover (6), and the impeller shaft (11) is installed in the rotating hole in the first protective cover (6) with the cooperation of a bearing; A driving gear (13) is installed on the outer side of the top of the impeller shaft (11); a driving shaft (7) is installed inside the first protective cover (6) through a bearing; a first driving gear (8) is installed on the top of the driving shaft (7); the first driving gear (8) and the driving gear (13) are connected to each other through a first internal toothed belt (14).

2. The energy-saving permanent magnet submersible centrifugal pump according to claim 1 is characterized in that: A connecting cylinder (22) is fixedly connected to the bottom end of the driving shaft (7), and a blocking strip (23) is vertically arranged on the inner wall of the connecting cylinder (22).

3. The energy-saving permanent magnet submersible centrifugal pump according to claim 1 is characterized in that: The bottom of the pump body (2) is connected to a connecting pipe (35), a fixed inner ring (33) is fixed on the inner wall of the bottom of the connecting pipe (35), a movable pipe (40) is movably arranged inside the fixed inner ring (33), a matching ring (36) is fixed on the outer side of the top of the movable pipe (40), and a spring (34) is directly fixed to the matching ring (36) and the fixed inner ring (33).

4. The energy-saving permanent magnet submersible centrifugal pump according to claim 3 is characterized in that: A positioning ring (32) is fixed inside the movable tube (40), a movable rod (30) is inserted inside the positioning ring (32), the bottom end of the movable rod (30) is connected to a second matching gear (29), a guide ring (31) is arranged on the outer side of the bottom of the movable tube (40), a water inlet pipe (28) is rotatably arranged at the bottom of the movable tube (40), and a guide groove is arranged inside the water inlet pipe (28), the guide ring (31) is arranged in the guide groove on the inner wall of the water inlet pipe (28), a protective rod (18) is fixed on the circumferential surface of the second matching gear (29), and the middle part of the protective rod (18) is fixed to the bottom end of the water inlet pipe (28).

5. The energy-saving permanent magnet submersible centrifugal pump according to claim 4 is characterized in that: A second fixing plate (19) is fixed to the outside of the movable tube (40), a second protective cover (15) is buckled on the bottom of the second fixing plate (19), a second matching gear (29) is sleeved on the outer wall of the water inlet pipe (28), a movable shaft (25) is rotatably mounted inside the second fixing plate (19), a second driving gear (26) is mounted on the bottom of the movable shaft (25), and the second driving gear (26) and the second matching gear (29) are connected to each other through a second internal toothed belt (27).

6. The energy-saving permanent magnet submersible centrifugal pump according to claim 5 is characterized in that: The top end of the movable shaft (25) is disposed deep inside the connecting tube (22), and a limit block (24) is disposed at the top end of the movable shaft (25). The limit block (24) and the stop bar (23) are disposed in an up-and-down manner.

7. The energy-saving permanent magnet submersible centrifugal pump according to claim 1 is characterized in that: A first protective plate (9) is arranged on the bottom side of the first protective cover (6), and a second protective plate (10) is arranged on the top side of the second fixing plate (19); the first protective plate (9) and the second protective plate (10) are arranged in a staggered manner, and an outer side wall of the second protective plate (10) is arranged vertically and parallel to an inner side wall of the first protective plate (9).

8. The energy-saving permanent magnet submersible centrifugal pump according to claim 1 is characterized in that: The drainage pipe (5) is connected to a shunt pipe (37), a linkage rod (16) is arranged in the shunt pipe (37), a blocking plate (39) is arranged on the top of the linkage rod (16), and the blocking plate (39) is arranged at the connection buckle position between the drainage pipe (5) and the shunt pipe (37).

9. The energy-saving permanent magnet submersible centrifugal pump according to claim 8 is characterized in that: A limiting rod (38) is provided in the middle of the linkage rod (16), and the limiting rod (38) is used to support and limit the linkage rod (16).

10. The energy-saving permanent magnet submersible centrifugal pump according to claim 9 is characterized in that: A first fixing plate (17) is mounted on the outer side wall of the second protective cover (15), and the bottom end of the linkage rod (16) is fixed to the top of the first fixing plate (17).

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