CN221096852U - High-flow and high-cavitation-resistance double-suction type mining self-balancing multistage centrifugal pump - Google Patents

Abstract

The utility model provides a high-flow and high-cavitation-resistance double-suction type mining self-balancing multistage centrifugal pump, wherein a coupler (2) is arranged at an input section of a pump shaft (1), a penetrating rod assembly (24) is used for locking a water inlet section assembly, a first-stage flow passing assembly, a partition plate (9), a positive flow passing assembly, a water outlet section (13), a reverse flow passing assembly and a secondary water inlet section (18) into a whole, a bearing component A (3) and a bearing component B (20) are respectively arranged at the left end face of the water inlet section assembly and the right end face of a stuffing box body B (19), two ends of a connecting pipe (14) are respectively connected with the water outlet section (13) and the secondary water inlet section (18), and a tail end bearing cooling pipe (21) is respectively connected with the stuffing box body B (19) and the bearing component B (20). The device has set up combination formula double-shell water inlet section and terminal bearing cooling structure, has simplified the manufacturing degree of difficulty of water inlet section, has improved whole pump cavitation resistance and life moreover.

Description

High-flow and high-cavitation-resistance double-suction type mining self-balancing multistage centrifugal pump

Technical Field

The utility model relates to the technical field of mining self-balancing multistage centrifugal pumps, in particular to a high-flow and high-cavitation-resistance double-suction mining self-balancing multistage centrifugal pump.

Background

Compared with a horizontal multistage centrifugal pump, the self-balancing multistage centrifugal pump adopts a mode of back-to-back installation of impellers, a balancing disc or a balancing drum is omitted, the integral structure of the multistage centrifugal pump is simplified, the lift of the multistage centrifugal pump is improved, meanwhile, leakage of the multistage centrifugal pump is reduced, and the self-balancing multistage centrifugal pump has the characteristics of high efficiency, energy conservation, safe and stable operation, and is widely applied to the field of high-lift fluid transportation such as mine drainage and the like, and is also called as the mining self-balancing multistage centrifugal pump. However, in order to further improve the lift and flow of the mining self-balancing multistage centrifugal pump, the diameter of the outer circle of the impeller and the width of the flow channel of the mining self-balancing multistage centrifugal pump are increased, so that cavitation performance of the mining self-balancing multistage centrifugal pump is deteriorated, when the mining self-balancing multistage centrifugal pump is subjected to cavitation, under the combined action of a large amount of fluid medium shock waves and chemical corrosion, the surfaces of the impeller are subjected to scars and cracks, even sponge-shaped gradual falling occurs after a certain period of time, the lift is reduced due to further development, and the hydraulic performance and safe and stable operation of the mining self-balancing multistage centrifugal pump are seriously influenced.

At present, in order to solve the cavitation problem of the mining self-balancing multistage centrifugal pump, the following three technical means are mainly adopted at present: firstly, in the design of a mining self-balancing multistage centrifugal pump, the necessary cavitation allowance (i.e. a net suction head) of the pump and the necessary cavitation allowance of a device must be calculated, and in the installation and debugging process of the pump, the installation height of the pump must meet the design value of the necessary cavitation allowance; secondly, the anti-cavitation performance of the mining self-balancing multistage centrifugal pump is improved in a inducer mode, but the mining self-balancing multistage centrifugal pump in the form increases the complexity of the whole structure, and higher requirements are put on the hydraulic performance of the inducer and the installation accuracy of the inducer; thirdly, the first-stage double-suction impeller replaces the first-stage single-suction impeller of the mining self-balancing multistage centrifugal pump so as to improve the cavitation resistance of the multistage centrifugal pump. The first two methods are applied to engineering practice, and the method of replacing the first-stage single-suction impeller with the first-stage double-suction impeller increases the complexity of the water inlet section of the mining self-balancing multi-stage centrifugal pump, further increases the production and manufacturing cost of the water inlet section, and is still one of the technical problems to be solved urgently for the mining self-balancing multi-stage centrifugal pump.

In addition, although the mining self-balancing multistage centrifugal pump adopts a mode of back-to-back installation of impellers, the mining self-balancing multistage centrifugal pump is used for balancing the axial force generated when the mining self-balancing multistage centrifugal pump operates, residual axial force still exists when the mining self-balancing multistage centrifugal pump operates due to the operating condition and the non-uniformity of fluid media in a flow passage, the residual axial force acts on the bearing at the tail end of the mining self-balancing multistage centrifugal pump, the tail end bearing of the mining self-balancing multistage centrifugal pump is induced to generate heat, and the service life of the whole mining self-balancing multistage centrifugal pump is directly influenced.

In view of this, in order to effectively solve the cavitation problem of mining self-balancing multistage centrifugal pump, avoid mining self-balancing multistage centrifugal pump water inlet section to be difficult to the manufacturing problem simultaneously, in addition reduce mining self-balancing multistage centrifugal pump terminal bearing's temperature, improve mining self-balancing multistage centrifugal pump's life, a high-flow and high anti cavitation's double suction type mining self-balancing multistage centrifugal pump is needed.

Disclosure of Invention

The utility model aims to provide a high-flow and high-cavitation-resistance self-balancing multistage centrifugal pump for mines, which is characterized in that a first stage double-suction impeller is arranged in a combined double-shell water inlet section, and a mode of cooling a tail end bearing by fluid media in the pump is adopted, so that the tail end bearing is reduced, and the cavitation resistance and the service life of the whole machine are improved.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

A high-flow and high-cavitation-resistance double-suction type mining self-balancing multistage centrifugal pump comprises a pump shaft, a coupling, a bearing component A, a water inlet section component, a first-stage flow-through component, a partition plate, a positive flow-through component, a water outlet section, a connecting pipe, a reverse flow-through component, a secondary water inlet section, a stuffing box body B, a bearing component B, a tail end bearing cooling pipe, a penetrating rod component and a filler sealing flushing pipe.

Further, the water inlet section assembly comprises a stuffing box body A, a water inlet section body and a double-shell water inlet baffle, wherein the stuffing box body A, the water inlet section body and the double-shell water inlet baffle jointly form a water inlet cavity, the stuffing box body A is arranged at the left end face of the water inlet section body through a stud, an O-shaped sealing ring is arranged between the stuffing box body A and the water inlet section body, the double-shell water inlet baffle is arranged at the right end face of the water inlet section body through an L-shaped clamping groove, an O-shaped sealing ring is arranged between the double-shell water inlet baffle and the water inlet section body, a water inlet flange is arranged in the horizontal direction of the water inlet section body, and the graphite packing seal is arranged in an inner cavity between the stuffing box body A and a pump shaft through a packing gland.

Further, the outer side of the inner cavity of the double-shell water inlet baffle is provided with a flow passage, and a water outlet of the flow passage is connected with an inlet of the first-stage positive flow passing assembly behind the baffle.

Further, the first-stage flow-through assembly comprises a first-stage double-suction impeller and a first-stage guide vane, the first-stage double-suction impeller is mounted on the pump shaft through a common flat key, the first-stage guide vane is arranged at the outlet of the first-stage double-suction impeller, and the first-stage double-suction impeller and the first-stage guide vane are mounted in an inner cavity formed by the stuffing box body A and the double-shell water inlet baffle together.

Further, positive overflow subassembly include positive impeller, positive stator and positive middle section, positive impeller installs in the inner chamber of positive stator, in positive stator passes through set screw to be fixed in the inner chamber of positive middle section, positive impeller passes through ordinary flat key to be installed on the pump shaft, a plurality of positive overflow subassembly is installed between baffle and play water section through the mode of establishing ties, between baffle and the positive overflow subassembly, all set up O sealing washer between each positive overflow subassembly and the play water section.

Further, the anti-overflow assembly comprises an anti-impeller, an anti-guide vane and an anti-middle section, wherein the anti-impeller is installed in an inner cavity of the anti-guide vane, the anti-guide vane is fixed in the inner cavity of the anti-middle section through a set screw, the anti-impeller is installed on a pump shaft through a common flat key, a plurality of anti-overflow assemblies are installed between a secondary water inlet section and a secondary water outlet section in a serial connection mode, and O-shaped sealing rings are arranged between the secondary water inlet section and the anti-overflow assemblies, between each anti-overflow assembly and between the anti-overflow assembly and the water outlet section.

Further, an annular cooling flow passage is formed in the bearing mounting position of the bearing component B, threaded holes are formed in the outer edge of the upper end and the outer edge of the lower end of the annular cooling flow passage respectively, and the threaded holes in the lower end of the annular cooling flow passage are plugged by plugs and are used for periodically cleaning impurities in the annular cooling flow passage.

Further, a second cooling hole of the stuffing box body is formed in the outer edge of the upper end of the second stuffing box body, threads are formed on the inner circle surface of the second cooling hole of the stuffing box body, and the left side of the second cooling hole of the stuffing box body is communicated with an inner cavity between the secondary water inlet section and the second stuffing box body.

Compared with the prior art, the high-flow and high-cavitation-resistance double-suction type mining self-balancing multistage centrifugal pump has the advantages that the first-stage double-suction impeller is used for replacing the first-stage single-suction impeller, the overcurrent capacity is increased, the cavitation resistance of the whole pump unit is improved, meanwhile, the cooling of the bearing component B is realized by using fluid medium in the pump, and the overheating phenomenon caused by the fact that the tail end bearing bears too high axial force is avoided.

Drawings

FIG. 1 is an overall block diagram of the present utility model;

FIG. 2 is a left side view of FIG. 1 with the coupling removed;

Fig. 3 is a block diagram of a first stage double suction impeller of the present utility model.

Marked in the figure as: 1: a pump shaft; 2: a coupling; 3: bearing component A; 4: a stuffing box body A; 5: a water inlet section; 6: a first stage guide vane; 7: a first-stage double-suction impeller; 8: double-shell water inlet baffle; 9: a partition plate; 10: a positive impeller; 11: a positive guide vane; 12: a middle section; 13: a water outlet section; 14: a connecting pipe; 15: a counter-impeller; 16: a counter vane; 17: a reverse middle section; 18: a secondary water inlet section; 19: a stuffing box body B; 20: a bearing member B; 21: a terminal bearing cooling tube; 22: an annular cooling flow passage; 23: a second cooling hole of the stuffing box body; 24: a penetrating bar component; 25: the packing seals the flushing pipe.

Description of the embodiments

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "left", "right", "front", "rear", "inner", "outer", "both ends", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present utility model.

In order to make the technical problems, technical schemes and implementation effects to be solved more clear, an embodiment of the present utility model is further described below with reference to fig. 1-3:

Referring to fig. 1, 2 and 3, the high-flow and high-cavitation-resistance double-suction type mining self-balancing multistage centrifugal pump comprises a pump shaft 1, a coupling 2, a bearing component A3, a water inlet section component, a first stage flow passage component, a partition plate 9, a positive flow passage component, a water outlet section 13, a connecting pipe 14, a reverse flow passage component, a secondary water inlet section 18, a stuffing box body B19, a bearing component B20, a tail end bearing cooling pipe 21, a penetrating rod component 24 and a stuffing seal flushing pipe 25, wherein the coupling 2 is arranged at the input section of the pump shaft 1, the water inlet section component, the first stage flow passage component, the partition plate 9, the positive flow passage component, the water outlet section 13, the reverse flow passage component and the secondary water inlet section 18 are sequentially arranged on the pump shaft 1 from left to right, the penetrating rod component 24 passes through penetrating rod through holes at the outer edge of the water inlet section component and penetrating rod through holes at the outer edge of the secondary water inlet section 18, the water inlet section assembly, the first-stage flow-through assembly, the partition 9, the positive flow-through assembly, the water outlet section 13, the reverse flow-through assembly and the secondary water inlet section 18 are locked into a whole, the bearing component A3 is fixed at the left end face of the water inlet section assembly through a stud bolt, the stuffing box body B19 is fixed at the right end face of the secondary water inlet section 18 through a screw, the bearing component B20 is fixed at the right end face of the stuffing box body B19 through a screw, one end of the connecting pipe 14 is connected with a horizontal outlet flange of the water outlet section 13, the other end of the connecting pipe 14 is connected with a horizontal inlet flange of the secondary water inlet section 18, one end of the terminal bearing cooling pipe 21 is connected with the outer edge of the stuffing box body B19, the other end of the terminal bearing cooling pipe 21 is connected with the bearing component B20, one end of the stuffing sealing flushing pipe 25 is connected with the first-stage positive flow-through assembly behind the partition 9, the other end of the packing flushing pipe 25 is connected to the packing flushing hole of the water inlet section assembly.

As the preferred embodiment, the water inlet section component comprises a stuffing box body A4, a water inlet section body 5 and a double-shell water inlet baffle 8, wherein the stuffing box body A4, the water inlet section body 5 and the double-shell water inlet baffle 8 jointly form a water inlet cavity, the water inlet cavity is annular and is used for buffering the impact of a fluid medium on the inlet of a first-stage double-suction impeller 7, the stuffing box body A4 is installed at the left end face of the water inlet section body 5 through a double-head bolt, an O-shaped sealing ring is arranged between the stuffing box body A4 and the water inlet section body 5 to prevent leakage of the fluid medium in the water inlet section component, the double-shell water inlet baffle 8 is installed at the right end face of the water inlet section body 5 through an L-shaped clamping groove, a shaft sleeve and a sealing ring are installed between the central hole of the double-shell water inlet baffle 8 and a pump shaft 1 to prevent the fluid medium of the water inlet section component from directly entering the first-stage positive flow component after entering the partition 9 through the first-stage double-suction impeller 7, an O-shaped sealing ring is arranged between the double-shell water inlet baffle 8 and the water inlet section body 5, the graphite disc 5 is arranged in the horizontal direction of the water inlet section body 5, and the stuffing box body A is installed between the stuffing box 1 and the inner cavity through the sealing flange.

As the preferred embodiment, the inner cavity outer side of the double-shell water inlet baffle plate 8 is provided with a flow passage, the water outlet of the flow passage is connected with the inlet of the first-stage positive flow passing component behind the baffle plate 9, and a plurality of flow baffle plates are arranged in the flow passage and used for guiding the fluid medium to enter the first-stage positive flow passing component behind the baffle plate 9.

As the preferred embodiment, the first-stage flow-through assembly comprises a first-stage double-suction impeller 7 and a first-stage guide vane 6, wherein the first-stage double-suction impeller 7 is arranged on the pump shaft 1 through a common flat key, the first-stage guide vane 6 is arranged at the outlet of the first-stage double-suction impeller 7, the first-stage guide vane 6 is provided with a positive blade, the outlet of the positive blade flow channel is connected with a flow passage outside the inner cavity of the double-shell water inlet baffle 8, and the first-stage double-suction impeller 7 and the first-stage guide vane 6 are jointly arranged in the inner cavity formed by the stuffing box body A4 and the double-shell water inlet baffle 8.

As a preferred embodiment, the positive flow component includes a positive impeller 10, a positive guide vane 11 and a positive section 12, the positive impeller 10 is installed in the inner cavity of the positive guide vane 11, the positive guide vane 11 is fixed in the inner cavity of the positive middle section 12 through a positioning screw, the positive impeller 10 is installed on the pump shaft 1 through a common flat key, a plurality of positive flow components are installed between the baffle 9 and the water outlet section 13 in a serial connection mode, and O-shaped sealing rings are respectively arranged between the baffle and the positive flow component, between each positive flow component and between the positive flow component and the water outlet section 13.

As a preferred embodiment, the anti-overflow assembly comprises an anti-impeller 15, an anti-guide vane 16 and an anti-middle section 17, wherein the anti-impeller 15 is installed in the inner cavity of the anti-guide vane 16, the anti-guide vane 16 is fixed in the inner cavity of the anti-middle section 17 through a set screw, the anti-impeller 15 is installed on the pump shaft 1 through a common flat key, a plurality of anti-overflow assemblies are installed between the secondary water inlet section 18 and the water outlet section 13 in a serial connection mode, and O-shaped sealing rings are arranged between the secondary water inlet section 18 and the anti-overflow assemblies, between each anti-overflow assembly and between the anti-overflow assembly and the water outlet section 13.

As a preferred embodiment, the bearing mounting part of the bearing component B20 is provided with an annular cooling flow passage 22, the outer edge of the upper end and the outer edge of the lower end of the annular cooling flow passage 22 are respectively provided with threaded holes, the threaded holes of the lower end of the annular cooling flow passage 22 are plugged by plugs for periodically cleaning impurities in the annular cooling flow passage 22, and in order to improve the axial force bearing capacity of the bearing component B20, two angular contact ball bearings which are arranged back to back are arranged in the bearing component B20 and are used for bearing residual axial force.

As a preferred embodiment, the outer edge of the upper end of the second stuffing box 19 is provided with a second stuffing box cooling hole 23, the inner circular surface of the second stuffing box cooling hole 23 is provided with threads, one end of the end bearing cooling pipe 21 is connected with the inner circular threads of the second stuffing box cooling hole 23, the left side of the second stuffing box cooling hole 23 is communicated with the inner cavity between the secondary water inlet section 18 and the second stuffing box 19, and the fluid medium in the cavity between the secondary water inlet section 18 and the second stuffing box 19 is led into the annular cooling flow passage 22 of the bearing component b 20 through the second stuffing box cooling hole 23 and the end bearing cooling pipe 21 to cool the end bearing.

According to the high-flow and high-cavitation-resistance double-suction type mining self-balancing multistage centrifugal pump, when the pump operates, fluid medium enters the water inlet section assembly along the water inlet flange of the water inlet section body 5, enters the flow channel of the first-stage double-suction impeller 7 along the inlets at two sides of the first-stage double-suction impeller 7 and enters the flow channel of the double-shell water inlet baffle 8 along the first-stage guide vane 6 under the rotation action of the first-stage double-suction impeller 7, so that the fluid speed of the first-stage flow assembly is reduced, the flow capacity of the first-stage flow assembly is increased, and the cavitation resistance of the whole pump unit is further improved; in addition, a smooth through seal or a rectangular labyrinth seal is arranged between the secondary water inlet section 18 and the pump shaft 1, so that the leakage amount of the fluid medium of the secondary water inlet section 18 to the stuffing box body B19 is reduced, but part of the fluid medium still leaks into the stuffing box body B19 along the smooth through seal or the rectangular labyrinth seal, and the part of the fluid medium enters the end bearing cooling pipe 21 along the stuffing box body B cooling hole 23 so as to enter the annular cooling flow passage 22 of the bearing component B20 to cool the end bearing, and then flows back to the water inlet flange of the water inlet section 5 along the backflow pipeline, so that the bearing cooling function is realized, and meanwhile, the leakage of the fluid medium is avoided.

The described embodiments of the utility model are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Claims (8)

1. The utility model provides a high-flow and high anti cavitation's double suction type mining self-balancing multistage centrifugal pump, includes pump shaft (1), shaft coupling (2), bearing part first (3), advance water section subassembly, first order overflow subassembly, baffle (9), just overflow subassembly, play water section (13), connecting pipe (14), anti-overflow subassembly, secondary advance water section (18), packing box body second (19), bearing part second (20), terminal bearing cooling tube (21), wear thick stick subassembly (24) and packing seal flushing pipe (25), its characterized in that: the coupling (2) is arranged on an input section of the pump shaft (1), a water inlet section component, a first-stage overflow component, a partition plate (9), a positive overflow component, a water outlet section (13), a reverse overflow component and a secondary water inlet section (18) are sequentially arranged on the pump shaft (1) from left to right, a penetrating rod component (24) is connected with a horizontal outlet flange of the water outlet section (13) through penetrating rod through holes at the outer edge of the water inlet section component and penetrating rod through holes at the outer edge of the secondary water inlet section (18), the water inlet section component, the first-stage overflow component, the partition plate (9), the positive overflow component, the water outlet section (13), the reverse overflow component and the secondary water inlet section (18) are locked into a whole, a bearing component A (3) is fixed at the left end face of the water inlet section component through a double-headed bolt, a stuffing box body B (19) is fixed at the right end face of the secondary water inlet section (18) through bolts, a bearing component B (20) is fixed at the right end face of the stuffing box body B (19) through bolts, one end of a connecting pipe (14) is connected with a horizontal outlet flange of the water outlet section (13), the other end of the connecting pipe (14) is connected with a horizontal outlet flange of the water inlet pipe (21) of the secondary water inlet section (19) through a horizontal outlet flange, one end of the bearing component (21) is connected with the end of the bearing component B (21), one end of the bearing component is connected with the end of the second end of the cooling component (21 is connected with the end of the cooling flange (21), the other end of the packing seal flushing pipe (25) is connected with a packing seal flushing hole of the water inlet section assembly.

2. A high flow and high cavitation resistant double suction mining self balancing multistage centrifugal pump according to claim 1, wherein: the water inlet section assembly comprises a stuffing box body A (4), a water inlet section body (5) and a double-shell water inlet baffle (8), wherein the stuffing box body A (4), the water inlet section body (5) and the double-shell water inlet baffle (8) form a water inlet cavity together, the stuffing box body A (4) is installed on the left end face of the water inlet section body (5) through a double-head bolt, an O-shaped sealing ring is arranged between the stuffing box body A (4) and the water inlet section body (5), the double-shell water inlet baffle (8) is installed on the right end face of the water inlet section body (5) through an L-shaped clamping groove, an O-shaped sealing ring is arranged between the double-shell water inlet baffle (8) and the water inlet section body (5), a water inlet flange is arranged in the horizontal direction of the water inlet section body (5), and a graphite packing seal is installed in an inner cavity between the stuffing box body A (4) and a pump shaft (1) through a packing gland.

3. A high flow and high cavitation resistant double suction mining self balancing multistage centrifugal pump according to claim 1 or 2, wherein: the outer side of the inner cavity of the double-shell water inlet baffle plate (8) is provided with a flow passage, and the water outlet of the flow passage is connected with the inlet of the first-stage positive flow passing assembly behind the baffle plate (9).

4. A high flow and high cavitation resistant double suction mining self balancing multistage centrifugal pump according to claim 1, wherein: the first-stage flow-through assembly comprises a first-stage double-suction impeller (7) and a first-stage guide vane (6), wherein the first-stage double-suction impeller (7) is installed on the pump shaft (1) through a common flat key, the first-stage guide vane (6) is arranged at the outlet of the first-stage double-suction impeller (7), and the first-stage double-suction impeller (7) and the first-stage guide vane (6) are jointly installed in an inner cavity formed by the stuffing box body A (4) and the double-shell water inlet baffle (8).

5. A high flow and high cavitation resistant double suction mining self balancing multistage centrifugal pump according to claim 1, wherein: the positive flow component comprises a positive impeller (10), positive guide vanes (11) and a positive section (12), wherein the positive impeller (10) is installed in an inner cavity of the positive guide vanes (11), the positive guide vanes (11) are fixed in an inner cavity of the positive middle section (12) through positioning screws, the positive impeller (10) is installed on a pump shaft (1) through a common flat key, a plurality of positive flow components are installed between a baffle plate (9) and a water outlet section (13) in a series connection mode, and O-shaped sealing rings are arranged between the baffle plate and the positive flow components, between each positive flow component and between the positive flow components and the water outlet section (13).

6. A high flow and high cavitation resistant double suction mining self balancing multistage centrifugal pump according to claim 1, wherein: the anti-overflow assembly comprises an anti-impeller (15), an anti-guide vane (16) and an anti-middle section (17), wherein the anti-impeller (15) is installed in an inner cavity of the anti-guide vane (16), the anti-guide vane (16) is fixed in the inner cavity of the anti-middle section (17) through a set screw, the anti-impeller (15) is installed on a pump shaft (1) through a common flat key, a plurality of anti-overflow assemblies are installed between a secondary water inlet section (18) and a water outlet section (13) in a serial connection mode, and O-shaped sealing rings are arranged between the secondary water inlet section (18) and the anti-overflow assemblies, between each anti-overflow assembly and between the anti-overflow assemblies and the water outlet section (13).

7. A high flow and high cavitation resistant double suction mining self balancing multistage centrifugal pump according to claim 1, wherein: an annular cooling flow passage (22) is formed in a bearing mounting position of the bearing component B (20), threaded holes are formed in the outer edge of the upper end and the outer edge of the lower end of the annular cooling flow passage (22), the threaded holes in the lower end of the annular cooling flow passage (22) are plugged by plugs, impurities in the annular cooling flow passage (22) are cleaned regularly, and the axial force bearing capacity of the bearing component B (20) is improved.

8. A high flow and high cavitation resistant double suction mining self balancing multistage centrifugal pump according to claim 1, wherein: the outer edge of the upper end of the second stuffing box body (19) is provided with a second stuffing box body cooling hole (23), the inner circular surface of the second stuffing box body cooling hole (23) is provided with threads, and the left side of the second stuffing box body cooling hole (23) is communicated with an inner cavity between the secondary water inlet section (18) and the second stuffing box body (19).