Multi-stage pump for conveying mine water

Abstract

The invention belongs to the technical field of water pumps, and particularly relates to a multistage pump for conveying mine water, which comprises a base, a pump body and a motor are fixed on the top of the base, an output shaft of the motor is connected with the end part of a main shaft of the pump body, and the pump body comprises a water inlet pump cover and a water outlet pump cover; a plurality of impellers installed on the main shaft are arranged between the water inlet pump cover and the water outlet pump cover, a plurality of penetrating rods distributed in an annular array are arranged between the water inlet pump cover and the water outlet pump cover in a penetrating mode, the two ends of each penetrating rod are in threaded connection with nuts respectively, a shaft hole for the main shaft to penetrate through is formed in the water inlet pump cover, and a sealing ring arranged on the main shaft in a sleeving mode is arranged in the shaft hole. A check ring abutting against the sealing ring is arranged on the main shaft, and an anti-deflection assembly and a reinforcing sealing assembly are arranged on the water inlet pump cover. In the invention, the anti-deflection assembly prevents the sealing ring from rotating along with the main shaft, so that the wear surface of the sealing ring is the circumferential inner wall of the sealing ring, and the sealing effect of the sealing ring can be enhanced through the reinforcing sealing assembly.

Description

Technical Field

[0001] The invention relates to the technical field of water pumps, and in particular to a multi-stage pump for conveying mine water. Background Art

[0002] Multistage pumps include GDL multistage pumps, LG multistage pumps, DL multistage pumps, CDL multistage pumps, etc. Multistage pumps are simply many single-stage pumps connected in series. Its output water pressure can be very high. It is a type of centrifugal pump, and it also relies on the rotation of the impeller to obtain centrifugal force. Multistage pumps rely on the change of the pump chamber volume to achieve suction, compression and exhaust, so it is a centrifugal pump with variable volume.

[0003] Existing multi-stage pumps generally use sealing rings to seal between the main shaft and the housing. However, since the main shaft is constantly rotating, the sealing ring is easily worn, which then leads to reduced sealing performance. Therefore, corresponding improvements are made to address this problem. Summary of the invention

[0004] Based on the technical problems existing in the prior art, the present invention proposes a multi-stage pump for conveying mine water.

[0005] A multi-stage pump for conveying mine water proposed in the present invention comprises a base, a pump body and a motor are fixed on the top of the base, the output shaft of the motor is connected to the end of the main shaft of the pump body, the pump body comprises an inlet pump cover and an outlet pump cover, a plurality of impellers installed on the main shaft are arranged between the inlet pump cover and the outlet pump cover, a plurality of through bars distributed in a ring array are passed through the inlet pump cover and the outlet pump cover, nuts are respectively threadedly connected at both ends of the through bars, an axial hole for the main shaft to pass through is opened on the inlet pump cover, a sealing ring sleeved on the main shaft is arranged in the axial hole, a retaining ring that abuts against the sealing ring is arranged on the main shaft, an anti-deflection assembly and a reinforced sealing assembly are arranged on the inlet pump cover, the anti-deflection assembly is used to prevent the sealing ring from rotating with the main shaft, so that the wear surface of the sealing ring is the circumferential inner wall of the sealing ring, and the sealing effect of the sealing ring can be enhanced by strengthening the sealing assembly.

[0006] Preferably, the reinforced sealing assembly includes an oil cylinder fixed at the end of the water inlet pump cover, an oil outlet pipe is connected below the oil cylinder, a first tube hole for inserting the oil outlet pipe is opened at the top of the water inlet pump cover, a first circular hole communicating with the first tube hole is opened at the top of the sealing ring, a piston is elastically connected in the oil cylinder, a piston rod is fixedly connected to the outer end of the piston, and the piston rod is connected to a pushing assembly. When the multi-stage pump is working, the rotating main shaft will periodically push the piston rod into the oil cylinder through the pushing assembly, the piston rod will synchronously drive the piston to move, and then the piston will apply pressure to the lubricating oil in the oil cylinder, the lubricating oil in the oil cylinder will enter the first circular hole from the oil outlet pipe, and then lubricate the main shaft, so that the friction between the main shaft and the sealing ring can be reduced, thereby delaying the wear of the main shaft on the wearing surface of the sealing ring, enhancing its sealing effect, and when the lubricating oil fills the entire shaft hole, the effect of oil sealing is also achieved.

[0007] Preferably, a spring is fixed to the inner end of the piston, and the other end of the spring is fixed to the inner wall of the oil cylinder, so that the piston can be driven to reset and move by the spring.

[0008] Preferably, the pushing assembly includes a guide rod, a guide sleeve is fixed to the outer end of the water inlet pump cover, a guide rod is inserted in the guide sleeve, and the ends of the guide rod and the piston rod that abut against each other are provided with an inclined surface. A cam is provided on the fixed sleeve on the main shaft, and the edge of the cam abuts against the bottom end of the guide rod. When the main shaft rotates, the cam is synchronously driven to rotate, so that the cam will periodically push the guide rod upward, and then the guide rod will push the piston rod into the oil cylinder through the inclined surface.

[0009] Preferably, the oil cylinder is provided with a refueling pipe, and a first dust plug is provided on the refueling pipe. The piston rod is first pushed into the oil cylinder until the piston rod loses the restriction on the guide rod, and then the guide rod is pulled upward out of the guide sleeve, and then the piston rod is pulled outward until the piston moves to the outside of the refueling pipe. At this time, the lubricating oil can be added to the oil cylinder through the refueling pipe.

[0010] Preferably, a cavity is provided on the circumferential inner wall of the sealing ring, and the first circular hole is connected to the cavity. When the lubricating oil enters the cavity, the lubricating oil exerts a force on the sealing ring to diffuse in all directions, so that the outer surface of the sealing ring will be more closely attached to the shaft hole, thereby improving the sealing effect, and the friction between the inner surface of the sealing ring and the main shaft will be reduced, thereby reducing the wear on the friction surface of the sealing ring.

[0011] Preferably, the reinforced sealing assembly includes an air pipe, a second pipe hole for inserting the air pipe is opened on the top of the water inlet pump cover, a second circular hole is opened on the top of the sealing ring, the bottom end of the air pipe is fixed in the second circular hole, an air cavity communicating with the second circular hole is opened in the sealing ring, a one-way valve is fixed in the air pipe, and a second dust plug is provided at the top end of the air pipe. When the friction surface of the sealing ring is subjected to a certain wear, the second dust plug is opened, and then the air pipe is inflated through the inflation device, so that the air cavity can be inflated, and the friction surface of the sealing ring can be close to the main shaft again, thereby further strengthening the sealing effect.

[0012] Preferably, the air cavity is located above the midline of the sealing ring section, so that the friction surface thickness of the sealing ring can be increased, thereby increasing the service life of the sealing ring.

[0013] Preferably, the anti-deflection assembly includes a pair of docking strips fixed on the inner wall of the shaft hole, and a pair of docking grooves for inserting the docking strips are opened on the circumferential outer wall of the sealing ring. When installing the sealing ring, the docking strips are inserted into the corresponding docking grooves, so that the sealing ring can be prevented from rotating with the main shaft.

[0014] Compared with the prior art, the present invention provides a multi-stage pump for conveying mine water, which has the following beneficial effects: 1. A multi-stage pump for conveying mine water, by setting an anti-deflection component and a reinforced sealing component, the anti-deflection component prevents the sealing ring from rotating with the main shaft, so that the wear surface of the sealing ring is the circumferential inner wall of the sealing ring, and the sealing effect of the sealing ring can be enhanced by strengthening the sealing component.

[0015] 2. A multi-stage pump for conveying mine water. By setting an oil cylinder, the rotating main shaft will periodically push the piston rod into the oil cylinder through the pushing component, and the piston rod will synchronously drive the piston to move, and then the piston will apply pressure to the lubricating oil in the oil cylinder. The lubricating oil in the oil cylinder will enter the first circular hole from the oil outlet pipe and then lubricate the main shaft. In this way, the friction between the main shaft and the sealing ring can be reduced, thereby delaying the wear of the main shaft on the wearing surface of the sealing ring, enhancing its sealing effect, and when the lubricating oil fills the entire shaft hole, the effect of oil sealing is also achieved.

[0016] 3. A multi-stage pump for conveying mine water has a cavity. When lubricating oil enters the cavity, the lubricating oil exerts a force on the sealing ring to diffuse in all directions, so that the outer surface of the sealing ring will be more closely attached to the shaft hole, thereby improving the sealing effect, and the friction between the inner surface of the sealing ring and the main shaft will be reduced, thereby reducing the wear on the friction surface of the sealing ring.

[0017] 4. A multi-stage pump for conveying mine water has an air cavity. When the friction surface of the sealing ring is worn to a certain extent, the second dust plug is opened, and then air is inflated into the air pipe through an inflation device. In this way, the air cavity can be inflated, so that the friction surface of the sealing ring can be close to the main shaft again, thereby further enhancing the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a multi-stage pump for conveying mine water proposed by the present invention; Figure 2 A schematic diagram of the pump body structure of a multi-stage pump for conveying mine water proposed by the present invention; Figure 3 This is a schematic diagram of the oil cylinder installation structure of a multi-stage pump for conveying mine water proposed by the present invention; Figure 4 This is a schematic diagram of the internal structure of an oil cylinder of a multi-stage pump for conveying mine water proposed by the present invention; Figure 5 This is a schematic diagram of the sealing ring installation structure of a multi-stage pump for conveying mine water proposed by the present invention; Figure 6 A schematic diagram of the force acting on the sealing ring of a multi-stage pump for conveying mine water proposed by the present invention; Figure 7 This is a schematic diagram of the air pipe installation structure of a multi-stage pump for conveying mine water proposed by the present invention; Figure 8 For the present invention Figure 7 A schematic diagram of the enlarged structure at point A; Fig. 9 The present invention is a schematic diagram of a cross-sectional structure of a sealing ring of a multi-stage pump for conveying mine water.

[0019] In the figure: 1. base; 2. motor; 3. water inlet pump cover; 4. water outlet pump cover; 5. impeller; 6. through rod; 7. nut; 8. main shaft; 9. shaft hole; 10. sealing ring; 11. retaining ring; 12. first pipe hole; 13. oil cylinder; 14. oil outlet pipe; 15. first circular hole; 16. piston rod; 17. piston; 18. guide sleeve; 19. guide rod; 20. cam; 21. inclined surface; 22. spring; 23. oil filling pipe; 24. first dust plug; 25. cavity; 26. second pipe hole; 27. air pipe; 28. second circular hole; 29. ​​air cavity; 30. second dust plug; 31. one-way valve; 32. docking strip; 33. docking groove. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] Reference Figure 1-Figure 9 A multistage pump for conveying mine water comprises a base 1, a pump body and a motor 2 are fixed on the top of the base 1, the output shaft of the motor 2 is connected to the end of the main shaft 8 of the pump body, the pump body comprises an inlet pump cover 3 and an outlet pump cover 4, a plurality of impellers 5 mounted on the main shaft 8 are arranged between the inlet pump cover 3 and the outlet pump cover 4, a plurality of through rods 6 distributed in an annular array are penetrated between the inlet pump cover 3 and the outlet pump cover 4, nuts 7 are respectively threadedly connected at both ends of the through rod 6, an axial hole 9 for the main shaft 8 to pass through is opened on the inlet pump cover 3, a sealing ring 10 sleeved on the main shaft 8 is arranged in the axial hole 9, a retaining ring 11 abutting against the sealing ring 10 is arranged on the main shaft 8, an anti-deflection component and a reinforced sealing component are arranged on the inlet pump cover 3, the anti-deflection component prevents the sealing ring 10 from rotating with the main shaft 8, so that the wear surface of the sealing ring 10 is the circumferential inner wall of the sealing ring 10, and the sealing effect of the sealing ring 10 can be enhanced by strengthening the sealing component.

[0023] In Example 1, the reinforced sealing assembly includes an oil cylinder 13 fixed to the end of the water inlet pump cover 3, an oil outlet pipe 14 is connected to the bottom of the oil cylinder 13, a first pipe hole 12 for inserting the oil outlet pipe 14 is opened at the top of the water inlet pump cover 3, a first round hole 15 communicating with the first pipe hole 12 is opened at the top of the sealing ring 10, a piston 17 is elastically connected to the inside of the oil cylinder 13, a piston rod 16 is fixedly connected to the outer end of the piston 17, and the piston rod 16 is connected to the pushing assembly. When the multi-stage pump is working, the rotating main shaft 8 will periodically pass through the pushing assembly When the piston rod 16 is pushed into the oil cylinder 13, the piston rod 16 will synchronously drive the piston 17 to move, and then the piston 17 will apply pressure to the lubricating oil in the oil cylinder 13, and the lubricating oil in the oil cylinder 13 will enter the first circular hole 15 from the oil outlet pipe 14, and then lubricate the main shaft 8, so that the friction between the main shaft 8 and the sealing ring 10 can be reduced, thereby delaying the wear of the main shaft 8 on the wear surface of the sealing ring 10, enhancing its sealing effect, and when the lubricating oil fills the entire shaft hole 9, the effect of oil sealing is also achieved.

[0024] A spring 22 is fixed to the inner end of the piston 17 , and the other end of the spring 22 is fixed to the inner wall of the oil cylinder 13 , so that the piston 17 can be driven to reset and move by the spring 22 .

[0025] Among them, the pushing component includes a guide rod 19, a guide sleeve 18 is fixed to the outer end of the water inlet pump cover 3, the guide rod 19 is inserted in the guide sleeve 18, and the end of the guide rod 19 abutting against the piston rod 16 is provided with an inclined surface 21, and a cam 20 is fixed on the main shaft 8. The edge of the cam 20 abuts against the bottom end of the guide rod 19. When the main shaft 8 rotates, the cam 20 is synchronously driven to rotate, so that the cam 20 will periodically push the guide rod 19 upward, and then the guide rod 19 will push the piston rod 16 into the oil cylinder 13 through the inclined surface 21.

[0026] Furthermore, a refueling pipe 23 is provided on the oil cylinder 13, and a first dust plug 24 is provided on the refueling pipe 23. The piston rod 16 is first pushed into the oil cylinder 13 until the piston rod 16 loses the restriction on the guide rod 19, and then the guide rod 19 is pulled upward out of the guide sleeve 18, and then the piston rod 16 is pulled outward until the piston 17 moves to the outside of the refueling pipe 23. At this time, the lubricating oil can be added to the oil cylinder 13 through the refueling pipe 23.

[0027] Furthermore, a cavity 25 is formed on the inner wall of the sealing ring 10, and the first circular hole 15 is connected to the cavity 25. When the lubricating oil enters the cavity 25, the lubricating oil exerts a force on the sealing ring 10 to diffuse in all directions (such as Figure 6 In this way, the outer surface of the sealing ring 10 will be closer to the shaft hole 9, thereby improving the sealing effect, and the friction between the inner surface of the sealing ring 10 and the main shaft 8 will be reduced, thereby reducing the wear on the friction surface of the sealing ring 10.

[0028] In Example 2, the enhanced sealing component includes an air pipe 27, a second pipe hole 26 for inserting the air supply pipe 27 is opened on the top of the water inlet pump cover 3, a second circular hole 28 is opened on the top of the sealing ring 10, the bottom end of the air pipe 27 is fixed in the second circular hole 28, an air cavity 29 communicating with the second circular hole 28 is opened in the sealing ring 10, a one-way valve 31 is fixed in the air pipe 27, and a second dust plug 30 is provided at the top end of the air pipe 27. When the friction surface of the sealing ring 10 is subjected to a certain wear, the second dust plug 30 is opened at this time, and then the air pipe 27 is inflated through the inflation device, so that the air cavity 29 can be inflated, so that the friction surface of the sealing ring 10 can be close to the main shaft 8 again, thereby further strengthening the sealing effect.

[0029] Furthermore, the air cavity 29 is located above the midline of the cross section of the sealing ring 10 , so that the friction surface thickness of the sealing ring 10 can be increased, thereby increasing the service life of the sealing ring 10 .

[0030] Among them, the anti-deflection component includes a pair of docking strips 32 fixed on the inner wall of the shaft hole 9, and a pair of docking grooves 33 for inserting the docking strips 32 are opened on the circumferential outer wall of the sealing ring 10. When installing the sealing ring 10, the docking strips 32 are inserted into the corresponding docking grooves 33, so that the sealing ring 10 can be prevented from rotating with the main shaft 8.

[0031] Working principle: When the multi-stage pump is working, the rotating main shaft 8 synchronously drives the cam 20 to rotate, so that the cam 20 will periodically push the guide rod 19 upward, and then the guide rod 19 will push the piston rod 16 into the oil cylinder 13 through the inclined surface 21, and the piston rod 16 will synchronously drive the piston 17 to move, and then the piston 17 will apply pressure to the lubricating oil in the oil cylinder 13, and the lubricating oil in the oil cylinder 13 will enter the first circular hole 15 from the oil outlet pipe 14, and then lubricate the main shaft 8, so that the friction between the main shaft 8 and the sealing ring 10 can be reduced, thereby delaying the wear of the main shaft 8 on the wear surface of the sealing ring 10, enhancing its sealing effect, and when the lubricating oil fills the entire shaft hole 9, it also achieves the effect of oil sealing; When the lubricating oil enters the cavity 25, the lubricating oil exerts a force on the sealing ring 10 to diffuse in all directions (such as Figure 6 In this way, the outer surface of the sealing ring 10 will be closer to the shaft hole 9, thereby improving the sealing effect, and the friction between the inner surface of the sealing ring 10 and the main shaft 8 will be reduced, thereby reducing the wear on the friction surface of the sealing ring 10; First, push the piston rod 16 into the oil cylinder 13 until the piston rod 16 loses the restriction on the guide rod 19, then pull the guide rod 19 upward out of the guide sleeve 18, and then pull the piston rod 16 outward until the piston 17 moves to the outside of the filling pipe 23. At this time, the lubricating oil can be added to the oil cylinder 13 through the filling pipe 23; In another working mode, when the friction surface of the sealing ring 10 is worn to a certain extent, the second dust plug 30 is opened, and then the air pipe 27 is inflated through the inflation device, so that the air cavity 29 can be inflated, so that the friction surface of the sealing ring 10 can be tightly attached to the main shaft 8 again, thereby further enhancing the sealing effect.

[0032] 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 multistage pump for conveying mine water, comprising a base (1), characterized in that: A pump body and a motor (2) are fixed on the top of the base (1); the output shaft of the motor (2) is connected to the end of the main shaft (8) of the pump body; the pump body comprises an inlet pump cover (3) and an outlet pump cover (4); a plurality of impellers (5) mounted on the main shaft (8) are arranged between the inlet pump cover (3) and the outlet pump cover (4); a plurality of through rods (6) distributed in an annular array are arranged between the inlet pump cover (3) and the outlet pump cover (4); nuts (7) are respectively threadedly connected at both ends of the through rods (6); an axial hole (9) for the main shaft (8) to pass through is formed on the inlet pump cover (3); a sealing ring (10) sleeved on the main shaft (8) is arranged in the axial hole (9); a retaining ring (11) abutting against the sealing ring (10) is arranged on the main shaft (8); and an anti-deflection component and a reinforced sealing component are arranged on the inlet pump cover (3); The anti-deflection assembly is used to prevent the sealing ring (10) from rotating along with the main shaft (8); The reinforced sealing assembly comprises an oil cylinder (13) fixed to the end of the water inlet pump cover (3), an oil outlet pipe (14) is connected below the oil cylinder (13), a first pipe hole (12) is opened at the top of the water inlet pump cover (3), a first round hole (15) is opened at the top of the sealing ring (10), a piston (17) is elastically connected inside the oil cylinder (13), a piston rod (16) is fixedly connected to the outer end of the piston (17), and the piston rod (16) is connected to the pushing assembly; Or the enhanced sealing assembly comprises an air pipe (27), a second pipe hole (26) is opened at the top of the water inlet pump cover (3), a second circular hole (28) is opened at the top of the sealing ring (10), the bottom end of the air pipe (27) is fixed in the second circular hole (28), an air cavity (29) is opened in the sealing ring (10), a one-way valve (31) is fixed in the air pipe (27), and a second dust plug (30) is provided at the top end of the air pipe (27).

2. A multistage pump for conveying mine water according to claim 1, characterized in that: A spring (22) is fixed to the inner end of the piston (17), and the other end of the spring (22) is fixed to the inner wall of the oil cylinder (13).

3. A multistage pump for conveying mine water according to claim 1, characterized in that: The pushing assembly comprises a guide rod (19), a guide sleeve (18) is fixed to the outer end of the water inlet pump cover (3), the guide rod (19) is inserted into the guide sleeve (18), an inclined surface (21) is provided at one end of the guide rod (19) and the piston rod (16) abutting against each other, a cam (20) is provided on the fixed sleeve on the main shaft (8), and the edge of the cam (20) abuts against the bottom end of the guide rod (19).

4. A multistage pump for conveying mine water according to claim 1, characterized in that: The oil cylinder (13) is provided with a refueling pipe (23), and the refueling pipe (23) is plugged with a first dustproof plug (24).

5. A multistage pump for conveying mine water according to claim 1, characterized in that: A cavity (25) is provided on the circumferential inner wall of the sealing ring (10), and the first circular hole (15) is in communication with the cavity (25).

6. A multistage pump for conveying mine water according to claim 1, characterized in that: The air cavity (29) is located above the midline of the section of the sealing ring (10).

7. A multistage pump for conveying mine water according to claim 1, characterized in that: The anti-deflection assembly comprises a pair of docking strips (32) fixed on the inner wall of the shaft hole (9), and a pair of docking grooves (33) for the docking strips (32) to be inserted are formed on the circumferential outer wall of the sealing ring (10).

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