A centrifugal pump with controllable flow

Abstract

The present invention belongs to the technical field of centrifugal pumps, and in particular to a centrifugal pump with controllable flow, comprising a base, a pump casing and a motor are fixed on the top of the base, an inlet pipe and an outlet pipe are respectively arranged on the side and top of the pump casing, a transverse central axis is rotatably connected in the pump casing, an impeller located in the pump casing is fixed at one end of the central axis, a connecting pipe is fixed at the end of the outlet pipe, a box plate is arranged on the circumferential outer wall of the connecting pipe, a sealing plate is arranged in the box plate, an opening is arranged on the sealing plate, and a sealing leaf is rotatably connected in the opening through the main shaft. In the present invention, when adjusting the flow, the sealing plate is pushed into the connecting pipe in the transverse direction through the translation component, and the sealing leaves entering the connecting pipe will be rotated to a horizontal position one by one under the action of the driving component, and the opening will be slowly closed, so as to control the flow, so that the sealing plate will not be subjected to a large force of the water flow when moving, so that the sealing plate can be pushed to move in the connecting pipe faster and more labor-saving.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal pumps, and in particular to a centrifugal pump with controllable flow. Background Art

[0002] Modern industry mostly uses centrifugal water pumps for high-pressure water supply, and its water pressure can reach 80-2000 meters. The working principle of the centrifugal pump is: before starting, the pump should be filled with water. After starting, the rotating impeller drives the water in the pump to rotate at high speed. The water moves centrifugally, is thrown out and pressed into the outlet pipe. After the water is thrown out, the pressure near the impeller decreases, and a low-pressure area is formed near the shaft. The pressure here is much lower than the atmospheric pressure. Under the action of atmospheric pressure, the water outside opens the bottom valve and enters the pump from the water inlet pipe. The water rushing in is thrown out again with the high-speed rotation of the impeller and pressed into the outlet pipe. It has the characteristics of compact structure, wide flow and dust range, small vibration, and low maintenance and repair costs.

[0003] In order to solve the problem that "the existing centrifugal pumps are not very good at regulating water flow", the Chinese patent with publication number CN219570340U discloses a flow-controllable centrifugal pump, including a pump body, a fixing seat and an outlet flange are provided on the pump body, the fixing seat is connected to the base, a plurality of support frames are provided on the side of the base away from the pump body, the outlet flange is connected to the inlet flange, the side of the inlet flange away from the pump body is connected to the outlet pipe, the outlet pipe is provided with an adjustment pipe, a barrier module is provided in the cavity of the adjustment pipe, a push rod is provided on the barrier module, and the push rod is connected to the slider. Although the existing technical problems have been solved, the following problems still exist:

[0004] The flow rate in the inlet flange is changed by moving the baffle plate into the inlet flange. Since the fast-flowing water in the inlet flange will directly impact the baffle plate, the baffle plate will produce a large resistance to the water flow. This increases the resistance to the movement of the baffle plate, making it inconvenient for users to adjust. Therefore, corresponding improvements are made to address this problem. Summary of the invention

[0005] Based on the technical problems existing in the prior art, the present invention proposes a centrifugal pump with controllable flow rate.

[0006] A flow-controllable centrifugal pump proposed by the present invention comprises a base, a pump casing and a motor are fixed on the top of the base, a water inlet pipe and a water outlet pipe are respectively arranged on the side and the top of the pump casing, a transverse central axis is rotatably connected in the pump casing, an impeller located in the pump casing is fixed at one end of the central axis, and the other end is connected to the output shaft of the motor through a coupling, a connecting pipe is fixed at the end of the outlet pipe, a box plate is arranged on the circumferential outer wall of the connecting pipe, a T-shaped sealing plate capable of transverse movement is arranged in the box plate, a plurality of openings uniformly distributed transversely are opened on the sealing plate, a sealing page is rotatably connected in the opening through the main shaft, and the sealing plate is connected to a translation group A driving and rotating component is arranged in the box plate, the translation component is used to drive the sealing plate to move horizontally, and the driving and rotating component is used to drive the cover page to rotate around the main axis to close or open the opening. The cover page is initially in a vertical state to the opening. When adjusting the flow, the sealing plate is pushed horizontally into the connecting pipe through the translation component. At this time, the cover pages entering the connecting pipe will be rotated to a horizontal position one by one under the action of the driving and rotating component, and the opening will be slowly closed, so as to control the flow. In this way, the sealing plate will not be affected by a large force of the water flow when moving, so that the sealing plate can be pushed to move in the connecting pipe faster and more labor-saving.

[0007] Preferably, the translation assembly includes a screw rod, which passes through the box plate and is rotatably connected to the box plate. An ear seat is fixed to the top inner wall of the box plate. The end of the screw rod is rotatably connected to the ear seat. The screw rod is threadably connected to the sealing plate. By rotating the screw rod, the screw rod can drive the sealing plate to move along the box plate.

[0008] Preferably, the translation assembly includes a pair of synchronous wheels and a synchronous belt connecting the pair of synchronous wheels. A pair of fixing seats are fixed to the inner wall of the top of the box plate. The synchronous wheels are rotatably connected to the fixing seats. A pair of through-holes are opened at the end of the closing plate for the synchronous belt to pass through. The synchronous belt and the closing plate are fixedly connected by connecting plates located at the through-holes. A shaft column is fixed to one of the synchronous wheels. The other end of the shaft column passes through the box plate and is fixed with a handle. By rotating the shaft column with the handle, the shaft column will drive a corresponding synchronous wheel to rotate, and then the synchronous belt will roll between the two synchronous wheels. In this way, the synchronous belt can drive the closing plate to move inside the box plate.

[0009] Preferably, the driving assembly includes a rack and a plurality of gears that can be meshed with the rack. The closing plate is provided with a plurality of first mounting openings respectively located at the ends of the opening. The gear is located in the first mounting opening and fixedly sleeved on the main shaft. The rack is fixed on the top inner wall of the box plate. A fixed structure is provided in the opening. When the closing plate moves to the left, the gears will mesh with the rack one by one, and then under the action of the rack, the gears, the main shaft and the cover page will gradually rotate to a horizontal state. When the cover page rotates to a horizontal position, it is fixed by the fixed structure, and then the rack will disengage from the gear, and then it will mesh with the next gear. Conversely, when the closing plate is reset and moved, the gear, the main shaft and the cover page will be driven to rotate in the opposite direction under the action of the rack, thereby opening the opening.

[0010] Preferably, the driving assembly includes a push plate fixed on the inner wall opposite to the connecting tube and the box plate, and a socket for inserting the push plate is opened on the closing plate. The push plate is located above the main shaft. When the closing plate moves to the left, the push plate will gradually be inserted into the socket, and the end of the push plate will push the cover page to rotate to a horizontal state and stabilize in a horizontal state.

[0011] Preferably, the driving assembly includes a pair of mounting sleeves respectively located above and below the sealing plate, wherein a pressure rod that can repeatedly move toward the sealing plate is elastically connected in the mounting sleeve, and a plurality of second mounting openings respectively located at the ends of the openings are provided on the sealing plate, and a sleeve rod that is fixedly mounted on the main shaft and can contact the pressure rod is provided in the second mounting opening, and a fixed structure is provided in the opening, when the sealing plate moves into the connecting tube, the pressure rod located above is periodically pressed down, and the pressure rod below remains stationary, the pressure rod above moves downward and pushes the sleeve rod to rotate downward, and the sleeve rod will synchronously drive the main shaft and the cover page to rotate to a horizontal state, and when the cover page rotates to a horizontal position, it is fixed by the fixed structure, and when the sealing plate is reset, the pressure rod above remains stationary, and the pressure rod below is periodically pushed upward, and the pressure rod below will push the sleeve rod to rotate upward, thereby releasing the fixed state of the cover page.

[0012] Preferably, a spring is fixed to one end of the two pressure rods facing away from each other, and the other end of the spring is fixed to the inner wall of the mounting sleeve. A sliding opening is provided on the back side of the mounting sleeve, and a touch rod passing through the sliding opening is fixed to the back side of the pressure rod. The touch rod is connected to a pushing assembly, so that the pushing assembly can act on the corresponding touch rod, causing the pressure rods above and below to perform corresponding actions, and the pressure rods can be driven to reset by the spring.

[0013] Preferably, the pushing assembly includes a pair of inner shafts respectively located above and below the sealing plate, the inner ends of the inner shafts are fixedly sleeved with cams that can push the touch rods, the outer ends of the sealing plates are rotatably connected to a pair of shaft cylinders, the shaft cylinders are connected to the inner shafts through a one-way bearing, both shaft cylinders are fixedly sleeved with second pulleys, the two second pulleys are connected by a second belt, one of the shaft cylinders and the screw are fixedly sleeved with a first pulley, the two first pulleys are connected by a first belt, when the screw rotates, the screw will drive the shaft cylinder to rotate through the transmission cooperation of the first pulley and the first belt, and then the two shaft cylinders will rotate synchronously under the transmission action of the second pulley and the second belt, because the self-locking directions of the two one-way bearings are opposite, the two inner shafts will choose to rotate one by one, and the rotation of the inner shaft will synchronously drive the cam to rotate, and the cam will act on the corresponding touch rod.

[0014] Preferably, the fixing structure is an elastic gasket fixed on an inner wall of one side of the opening. When the cover is rotated to a horizontal state, the cover will squeeze the gasket on the side, thereby fixing the cover through the elasticity of the gasket.

[0015] Compared with the prior art, the present invention provides a centrifugal pump with controllable flow, which has the following beneficial effects:

[0016] 1. A centrifugal pump with controllable flow rate, which is provided with a sealing plate with an opening. The sealing plate is initially in a vertical position with the opening. When adjusting the flow rate, the sealing plate is pushed laterally into a connecting pipe by a translation component. At this time, the sealing plates entering the connecting pipe are rotated to a horizontal position one by one under the action of a driving component, and the opening is slowly closed, thereby controlling the flow rate. In this way, the sealing plate will not be subjected to a large force of the water flow when moving, so that the sealing plate can be pushed to move in the connecting pipe faster and with less effort.

[0017] 2. A centrifugal pump with controllable flow rate. By setting gears, when the sealing plate moves to the left, the gears will mesh with the racks one by one, and then under the action of the rack, the gears, the main shaft and the cover page will gradually rotate to a horizontal state. When the cover page rotates to a horizontal position, it will be fixed by a fixed structure, and then the rack will disengage from the gear, and then it will mesh with the next gear. Conversely, when the sealing plate is reset and moved, the gears, the main shaft and the cover page will be driven to rotate in the opposite direction under the action of the rack, thereby opening the opening.

[0018] 3. A centrifugal pump with controllable flow rate, by setting a push plate, when the cover plate moves to the left, the push plate will gradually insert into the socket, and the end of the push plate will push the cover page to rotate to a horizontal state and stabilize in a horizontal state.

[0019] 4. A centrifugal pump with controllable flow rate is provided with a pressure rod. When the sealing plate moves into the connecting pipe, the pressure rod at the top is periodically pressed down, and the pressure rod at the bottom remains stationary. The pressure rod at the top moves downward and pushes the sleeve rod to rotate downward. The sleeve rod will synchronously drive the main shaft and the sealing page to rotate to a horizontal state. When the sealing page rotates to a horizontal position, it is fixed by a fixed structure. When the sealing plate is reset, the pressure rod at the top remains stationary and periodically pushes the pressure rod at the bottom upward. The pressure rod at the bottom will push the sleeve rod to rotate upward, thereby releasing the fixed state of the sealing page. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a centrifugal pump with controllable flow rate proposed by the present invention;

[0021] Figure 2 This is a schematic diagram of the installation structure of a driving assembly of a centrifugal pump with controllable flow rate proposed in Example 1 of the present invention;

[0022] Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure at point A;

[0023] Figure 4 This is a schematic diagram of the installation structure of a translation assembly of a centrifugal pump with controllable flow rate proposed in Example 2 of the present invention;

[0024] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure at B;

[0025] Figure 6 This is a schematic diagram of the installation structure of a driving assembly of a centrifugal pump with controllable flow rate proposed in Example 2 of the present invention;

[0026] Figure 7 For the present invention Figure 6 A schematic diagram of the enlarged structure at C;

[0027] Figure 8 This is a schematic diagram of the installation structure of a driving assembly of a centrifugal pump with controllable flow rate proposed in Example 3 of the present invention;

[0028] Fig. 9 For the present invention Figure 8 A schematic diagram of the structure at D of FIG.

[0029] Fig.10 For the present invention Figure 8 A schematic diagram of the structure at E of FIG.

[0030] Fig.11 A schematic diagram of the installation structure between an installation sleeve and a pressure rod of a centrifugal pump with controllable flow rate proposed by the present invention;

[0031] Fig.12 This is a schematic diagram of the gasket installation structure of a flow-controllable centrifugal pump proposed by the present invention.

[0032] In the figure: 1. base; 2. pump casing; 3. motor; 4. central axis; 5. water inlet pipe; 6. water outlet pipe; 7. connecting pipe; 8. box plate; 9. sealing plate; 10. opening; 11. main shaft; 12. cover; 13. ear seat; 14. screw; 15. fixed seat; 16. synchronous wheel; 17. synchronous belt; 18. through-hole; 19. connecting plate; 20. shaft column; 21. handle; 22. rack; 23. first installation port; 24. gear; 25. push plate; 26. socket; 27. second installation port; 28. sleeve rod; 29. ​​installation sleeve; 30. pressure rod; 31. spring; 32. touch rod; 33. sliding mouth; 34. inner shaft; 35. cam; 36. shaft cylinder; 37. first pulley; 38. first belt; 39. second pulley; 40. second belt; 41. gasket. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] Reference Figure 1-12A centrifugal pump with controllable flow rate comprises a base 1, a pump casing 2 and a motor 3 are fixed on the top of the base 1, an inlet pipe 5 and an outlet pipe 6 are respectively arranged on the side and the top of the pump casing 2, a transverse central shaft 4 is rotatably connected in the pump casing 2, one end of the central shaft 4 is fixed with an impeller located in the pump casing 2, and the other end is connected to the output shaft of the motor 3 through a coupling, a connecting pipe 7 is fixed to the end of the outlet pipe 6, a box plate 8 is arranged on the circumferential outer wall of the connecting pipe 7, a T-shaped sealing plate 9 capable of lateral movement is arranged in the box plate 8, a plurality of openings 10 uniformly distributed laterally are opened on the sealing plate 9, a sealing page 12 is rotatably connected in the opening 10 through a main shaft 11, and a translation component is connected to the sealing plate 9 A driving and rotating assembly is provided in the box plate 8, and the translation assembly is used to drive the sealing plate 9 to move horizontally. The driving and rotating assembly is used to drive the cover page 12 to rotate around the main axis 11 to close or open the opening 10. The cover page 12 is initially in a vertical state with the opening 10. When adjusting the flow rate, the sealing plate 9 is pushed laterally into the connecting pipe 7 through the translation assembly. At this time, the cover pages 12 entering the connecting pipe 7 will be rotated to a horizontal position one by one under the action of the driving and rotating assembly, and the opening 10 will be slowly closed to control the flow rate. In this way, the sealing plate 9 will not be subjected to a large force of the water flow when moving, so that the sealing plate 9 can be pushed to move in the connecting pipe 7 faster and more labor-saving.

[0036] In Example 1, the translation assembly includes a screw 14, which passes through the box plate 8 and is rotatably connected to the box plate 8. An ear seat 13 is fixed to the top inner wall of the box plate 8. The end of the screw 14 is rotatably connected to the ear seat 13. The screw 14 is threadedly connected to the sealing plate 9. By rotating the screw 14, the screw 14 can drive the sealing plate 9 to move along the box plate 8.

[0037] In Example 2, the translation assembly includes a pair of synchronous wheels 16 and a synchronous belt 17 connecting the pair of synchronous wheels 16. A pair of fixed seats 15 are fixed to the inner wall of the top of the box plate 8. The synchronous wheel 16 is rotatably connected to the fixed seat 15. A pair of through-holes 18 for the synchronous belt 17 to pass through are opened at the end of the closing plate 9. The synchronous belt 17 and the closing plate 9 are fixedly connected by a connecting plate 19 located at the through-holes 18. A shaft column 20 is fixed to one of the synchronous wheels 16. The other end of the shaft column 20 passes through the box plate 8 and is fixed with a handle 21. By rotating the shaft column 20 with the handle 21, the shaft column 20 will drive the corresponding synchronous wheel 16 to rotate, and then the synchronous belt 17 will roll between the two synchronous wheels 16. In this way, the synchronous belt 17 can drive the closing plate 9 to move in the box plate 8.

[0038] In Example 1, the driving assembly includes a rack 22 and a plurality of gears 24 that can be meshed with the rack 22. The closing plate 9 is provided with a plurality of first mounting openings 23 respectively located at the ends of the opening 10. The gear 24 is located in the first mounting opening 23 and is fixedly mounted on the main shaft 11. The rack 22 is fixed on the top inner wall of the box plate 8. A fixed structure is provided in the opening 10. When the closing plate 9 moves to the left, the gears 24 will mesh with the rack 22 one by one, and then under the action of the rack 22, the gear 24, the main shaft 11 and the cover page 12 will gradually rotate to a horizontal state. When the cover page 12 rotates to a horizontal position, it is fixed by the fixed structure, and then the rack 22 will disengage from the gear 24, and then it will mesh with the next gear 24. Conversely, when the closing plate 9 is reset and moved, the gear 24, the main shaft 11 and the cover page 12 will be driven to rotate in the opposite direction under the action of the rack 22, thereby opening the opening 10.

[0039] In Example 2, the driving assembly includes a push plate 25 fixed on the inner wall opposite to the connecting tube 7 and the box plate 8, and a socket 26 for inserting the push plate 25 is provided on the closing plate 9. The push plate 25 is located above the main shaft 11. When the closing plate 9 moves to the left, the push plate 25 will gradually be inserted into the socket 26, and the end of the push plate 25 will push the cover page 12 to rotate to a horizontal state and stabilize in a horizontal state.

[0040] In Example 3, the driving assembly includes a pair of mounting sleeves 29 respectively located at the upper and lower parts of the sealing plate 9, and a pressure rod 30 that can be repeatedly moved toward the sealing plate 9 is elastically connected in the mounting sleeve 29. A plurality of second mounting openings 27 respectively located at the ends of the opening 10 are opened on the sealing plate 9, and a sleeve rod 28 that is fixedly sleeved on the main shaft 11 and can contact the pressure rod 30 is arranged in the second mounting opening 27. A fixed structure is arranged in the opening 10. When the sealing plate 9 moves into the connecting pipe 7, the pressure rod 30 located at the top is periodically pressed down, and the pressure rod 30 at the bottom remains stationary. The pressure rod 30 at the top moves downward and pushes the sleeve rod 28 to rotate downward. The sleeve rod 28 will synchronously drive the main shaft 11 and the cover page 12 to rotate to a horizontal state. When the cover page 12 rotates to a horizontal position, it is fixed by the fixed structure. When the sealing plate 9 is reset, the pressure rod 30 at the top remains stationary, and the pressure rod 30 located at the bottom is periodically pushed upward. The pressure rod 30 at the bottom will push the sleeve rod 28 to rotate upward, thereby releasing the fixed state of the cover page 12.

[0041] Among them, a spring 31 is fixed to the opposite end of the two pressure rods 30, and the other end of the spring 31 is fixed to the inner wall of the mounting sleeve 29. A sliding opening 33 is provided on the back of the mounting sleeve 29. A touch rod 32 passing through the sliding opening 33 is fixed to the back of the pressure rod 30. The touch rod 32 is connected to a pushing assembly, so that the pushing assembly can act on the corresponding touch rod 32, so that the pressure rods 30 located above and below perform corresponding actions, and the pressure rods 30 can be driven to reset by the spring 31.

[0042] The push assembly includes a pair of inner shafts 34 located above and below the closing plate 9, respectively, the inner ends of the inner shafts 34 are fixedly sleeved with a cam 35 that can push the touch rod 32, and the outer ends of the closing plate 9 are rotatably connected with a pair of shaft cylinders 36, which are connected to the inner shaft 34 through a one-way bearing, and the two shaft cylinders 36 are fixedly sleeved with a second pulley 39, and the two second pulleys 39 are connected by a second belt 40. One of the shaft cylinders 36 and the screw rod 14 are fixedly sleeved with a first pulley 37, and the two first pulleys 37 are connected by a first belt 38. When the screw rod 14 rotates, the screw rod 14 will drive the shaft cylinder 36 to rotate through the transmission cooperation of the first pulley 37 and the first belt 38, and then the two shaft cylinders 36 will rotate synchronously under the transmission action of the second pulley 39 and the second belt 40. Since the self-locking directions of the two one-way bearings are opposite, the two inner shafts 34 will choose to rotate one by one, and when the inner shaft 34 rotates, the cam 35 is synchronously driven to rotate, and the cam 35 will act on the corresponding touch rod 32.

[0043] Among them, the fixing structure is an elastic gasket 41, which is fixed on the inner wall of one side of the opening 10. When the cover 12 rotates to a horizontal state, the cover 12 will squeeze the gasket 41 on the side, thereby fixing the cover 12 through the elasticity of the gasket 41.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flow-controllable centrifugal pump, comprising a base (1), a pump casing (2) and a motor (3) being fixed on the top of the base (1), a water inlet pipe (5) and a water outlet pipe (6) being provided on the side and the top of the pump casing (2), respectively, a transverse central shaft (4) being rotatably connected in the pump casing (2), one end of the central shaft (4) being fixed with an impeller located in the pump casing (2), and the other end being connected to the output shaft of the motor (3) via a coupling, characterized in that: A connecting pipe (7) is fixed to the end of the water outlet pipe (6), a box plate (8) is provided on the circumferential outer wall of the connecting pipe (7), a T-shaped sealing plate (9) capable of transverse movement is provided inside the box plate (8), a plurality of openings (10) evenly distributed transversely are provided on the sealing plate (9), a sealing leaf (12) is rotatably connected to the opening (10) via a main shaft (11), the sealing plate (9) is connected to a translation component, and a driving component is provided inside the box plate (8); The translation assembly is used to drive the sealing plate (9) to move laterally; The driving and rotating assembly is used to drive the cover page (12) to rotate around the main shaft (11) so as to close or open the opening (10); The translation assembly comprises a screw rod (14), the screw rod (14) passes through the box plate (8) and is rotatably connected to the box plate (8), an ear seat (13) is fixed to the top inner wall of the box plate (8), an end of the screw rod (14) is rotatably connected to the ear seat (13), and the screw rod (14) is threadedly connected to the sealing plate (9); The driving assembly comprises a pair of mounting sleeves (29) respectively located above and below the sealing plate (9); a pressure rod (30) capable of repeatedly moving downward is elastically connected in the mounting sleeve (29); a plurality of second mounting openings (27) respectively located at the ends of the opening (10) are provided on the sealing plate (9); a sleeve rod (28) fixedly mounted on the main shaft (11) and capable of contacting the pressure rod (30) is provided in the second mounting opening (27); a fixing structure is also provided in the opening (10); when the cover page (12) is rotated to a horizontal position, it is fixed by the fixing structure; A spring (31) is fixed to the top of the pressure rod (30), the top of the spring (31) is fixed to the top inner wall of the mounting sleeve (29), a sliding opening (33) is provided on the back of the mounting sleeve (29), a touch rod (32) passing through the sliding opening (33) is fixed to the back of the pressure rod (30), and the touch rod (32) is connected to a push assembly; The push assembly comprises a pair of inner shafts (34) respectively located above and below the sealing plate (9); the inner ends of the inner shafts (34) are fixedly sleeved with a cam (35) capable of pushing the contact rod (32); the outer ends of the sealing plate (9) are rotatably connected to a pair of shaft cylinders (36); the shaft cylinders (36) are connected to the inner shafts (34) via a one-way bearing; the two shaft cylinders (36) are both fixedly sleeved with a second pulley (39); the two second pulleys (39) are connected via a second belt (40); one of the shaft cylinders (36) and the screw rod (14) are both fixedly sleeved with a first pulley (37); the two first pulleys (37) are connected via a first belt (38).

2. A centrifugal pump with controllable flow rate according to claim 1, characterized in that: The translation assembly comprises a pair of synchronous wheels (16) and a synchronous belt (17) connecting the pair of synchronous wheels (16). A pair of fixing seats (15) are fixed to the inner wall of the top of the box plate (8). The synchronous wheels (16) are rotatably connected to the fixing seats (15). A pair of through-holes (18) for the synchronous belt (17) to pass through are formed at the end of the closing plate (9). The synchronous belt (17) and the closing plate (9) are fixedly connected via a connecting plate (19) located at the through-holes (18). A shaft column (20) is fixed to one of the synchronous wheels (16). The other end of the shaft column (20) passes through the box plate (8) and is fixed with a handle (21).

3. A centrifugal pump with controllable flow rate according to claim 1, characterized in that: The driving assembly comprises a rack (22) and a plurality of gears (24) capable of meshing with the rack (22); a plurality of first mounting openings (23) respectively located at the ends of the opening (10) are provided on the cover plate (9); the gears (24) are located in the first mounting openings (23) and are fixedly sleeved on the main shaft (11); the rack (22) is fixed on the top inner wall of the box plate (8); a fixing structure is provided in the opening (10); when the cover page (12) is rotated to a horizontal position, it is fixed by the fixing structure.

4. A centrifugal pump with controllable flow rate according to claim 1, characterized in that: The driving assembly comprises a push plate (25) fixed on the inner wall of the connecting pipe (7) and the box plate (8) opposite to each other, and a socket (26) for inserting the push plate (25) is provided on the sealing plate (9), and the push plate (25) is located above the main shaft (11).

5. A flow-controllable centrifugal pump according to claim 1 or 3, characterized in that: The fixing structure is an elastic gasket (41), and the gasket (41) is fixed on an inner wall of one side of the opening (10).

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