A deep water submersible electric pump

Abstract

The present invention belongs to the field of submersible electric pumps and discloses a deep-water submersible electric pump; it comprises a submersible motor and a bracket, wherein a first pump body and a second pump body are arranged on the bracket, wherein the first pump body is fixedly connected to the bracket and the second pump body is arranged on the first pump body; a first impeller is arranged in the first pump body and a second impeller is arranged in the second pump body, wherein the first impeller and the second impeller are sleeved on a pump shaft, and the pump shaft is connected to the submersible motor; a first water inlet pipe is arranged on the lower side of the first pump body and a second water inlet pipe is arranged on the lower side of the second pump body, a first drain pipe is arranged on the upper side of the first pump body and a second drain pipe is arranged on the upper side of the second pump body; the output ends of the first drain pipe are respectively connected to the lower end of the second pump body and a third drain pipe, and the output end of the second drain pipe is also connected to the third drain pipe; the device of the present invention facilitates the conversion of working modes, reduces the head, improves the working efficiency, and has broad application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of submersible electric pumps, and in particular to a deep-water submersible electric pump. Background Art

[0002] Deepwater submersible electric pumps are mostly used for forced drainage operations of deeper water sources, such as forced drainage of mines. In the process of deepwater drainage, the following situations are often encountered: First, in the early stage of drainage, the amount of accumulated water is large and the water level is high. The drainage time can be shortened by draining water with a large flow rate. Generally, two pumps are used in parallel. This method has a low head but a large flow rate. As the water level decreases, the head of the two pumps in parallel operation cannot meet the requirements. At this time, two pumps with large heads are usually used in series. The water is pressurized by the two pumps twice to increase the head. In the prior art, the structural transformation of the two pumps in parallel and series usually requires manual disassembly and installation, which is time-consuming and labor-intensive. In addition, the drainage needs to be stopped during the installation process, which reduces the working efficiency of the submersible electric pump and the management level and economic benefits of the drainage system, and affects the timeliness of emergency rescue.

[0003] In the prior art, deepwater submersible electric pumps generally need to be submerged in water. Placing the submersible electric pumps in the water will invisibly increase the drainage head and reduce the drainage flow rate. In addition, the submersible electric pump is always at the bottom of the water, and the large suction force of the water inlet can easily suck up the sludge at the bottom of the water and block the water inlet, which can easily cause equipment damage. Moreover, the submersible electric pumps set in deep water need to withstand the huge pressure brought by the depth of the water body. Placing the submersible electric pumps in deep water all the time will put forward high requirements on the pressure bearing capacity of the submersible electric pumps. Therefore, it is necessary to increase the cost and enhance the pressure resistance of the submersible electric pumps to meet the use requirements. In view of this, how to provide a deepwater submersible electric pump that can easily adjust the series-parallel working mode, has high working efficiency, and is suitable for use in deep water is a technical problem that technicians in this field need to solve. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a deep-water submersible electric pump which can conveniently adjust the series-parallel working mode, has high working efficiency and is suitable for use in deep water.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A deep-water submersible electric pump is designed, comprising a submersible motor arranged vertically upward and a bracket arranged at the upper end of the submersible motor, the upper end of the bracket is provided with a first pump body and a second pump body, the first pump body is fixedly connected to the upper end of the bracket, and the second pump body is arranged at the upper end of the first pump body; a first impeller is arranged in the first pump body, and a second impeller is arranged in the second pump body, the first impeller and the second impeller are both sleeved on the pump shaft, and the pump shaft passes through the second pump body and the first pump body in sequence and is connected to the rotor of the submersible motor; a first water inlet pipe is arranged at the lower side of the first pump body, a second water inlet pipe is arranged at the lower side of the second pump body, a first drain pipe is arranged at the upper side of the first pump body, and a second drain pipe is arranged at the upper side of the second pump body; the output of the first drain pipe The ends are respectively connected to the lower end of the second pump body and the third drain pipe, and the output end of the second drain pipe is also connected to the third drain pipe; a first switch valve is arranged on the second water inlet pipe, a second switch valve is arranged between the first drain pipe and the second pump body, and a third switch valve is arranged between the first drain pipe and the third drain pipe; the pump shaft and the first pump body and the pump shaft and the second pump body are connected through a bearing, and a sealing ring is also arranged between the pump shaft and the first pump body and the pump shaft and the second pump body; two auxiliary impellers are also sleeved on the pump shaft, one of the auxiliary impellers is arranged in the first pump body, and the other auxiliary impeller is arranged in the second pump body; an air bag is arranged at the upper end of the second pump body, and the second pump body is connected to the air bag through a flexible connecting rope.

[0007] Preferably, the housing and the bracket of the submersible motor are connected by bolts.

[0008] Preferably, the pump shaft is connected to the rotor of the submersible motor via a coupling.

[0009] Preferably, the first water inlet pipe, the first drain pipe and the second drain pipe are all provided with a check valve.

[0010] Preferably, a load-bearing base is provided below the submersible motor, and the load-bearing base is connected to the bracket via a connecting rod.

[0011] Preferably, the water inlets of the first water inlet pipe and the second water inlet pipe are higher than the submersible motor, and the water inlets of the first water inlet pipe and the second water inlet pipe are both provided with mud blocking covers.

[0012] Preferably, the diameters of the first drain pipe and the second drain pipe are equal, and the diameters of the first drain pipe and the second drain pipe are smaller than the diameter of the third drain pipe.

[0013] The deep-water submersible electric pump proposed by the present invention has the following beneficial effects:

[0014] (1) In the initial period of pumping, the first and third switch valves are opened and the second switch valve is closed, so that the first and second water inlet pipes simultaneously pump water, thereby forming a dual-pump parallel drainage mode with low head and large flow rate. During operation, as the water level gradually decreases, the head of the deep-water submersible electric pump also increases. At this time, the first and third switch valves can be closed and the second switch valve can be opened. After water enters from the first water inlet pipe, it is pressurized by the first impeller in the first pump body and then discharged from the first drainage pipe to the second pump body. After water is pressurized by the second impeller in the second pump body, it is discharged from the second drainage pipe and the third drainage pipe in turn. When the device of the present invention switches the working mode, it is not necessary to disassemble and install the equipment again, thereby improving the efficiency and continuity of operation, saving installation time, and avoiding unnecessary damage to the equipment during the disassembly process.

[0015] (2) Before the device of the present invention works, the air bag is filled with gas, and then the entire deep-water submersible electric pump is placed in water. Due to the buoyancy, the air bag will float on the water surface, and the deep-water submersible electric pump is always located near the water level. Since the deep-water submersible electric pump is located near the water level, the water pressure is relatively low, and the pressure on the surface of the pump body is also relatively small. The surface of the pump body does not need to be specially designed to resist pressure, thereby virtually reducing the cost. At the same time, the deep-water submersible electric pump is always located near the water level. Compared with the prior art in which the deep-water submersible electric pump is always set at the bottom of the water, the head is reduced, the drainage power is saved, and the drainage flow rate is increased. It also avoids the damage to the pump body caused by the sludge and granular impurities at the bottom of the water entering the water pump.

[0016] (3) The device of the present invention is provided with auxiliary impellers in both the first pump body and the second pump body. The auxiliary impellers play a sealing role on the one hand, and reduce the axial force of the pump shaft on the other hand, thereby extending the bearing life and thus improving the service life of the equipment;

[0017] (4) The buoyancy of the device of the present invention by the air bag floating on the water surface keeps the entire device in a position near the water level, effectively avoiding damage to the device caused by the strong water pressure at the bottom of the water;

[0018] (5) The device of the present invention does not require manual switching of the working mode, and at the same time reduces the lift and improves the working efficiency. It is suitable for deep water drainage work and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described in detail below in conjunction with the embodiments in the accompanying drawings, but this does not constitute any limitation to the present invention.

[0020] Figure 1 It is a schematic diagram of the structure of the device of the present invention.

[0021] In the figure: submersible motor 1, bracket 2, first pump body 3, second pump body 4, first impeller 5, second impeller 6, pump shaft 7, first water inlet pipe 8, second water inlet pipe 9, first drain pipe 10, second drain pipe 11, third drain pipe 12, first switch valve 13, second switch valve 14, third switch valve 15, bearing 16, sealing ring 17, auxiliary impeller 18, air bag 19, flexible connecting rope 20, coupling 21, check valve 22, load-bearing base 23, connecting rod 24, mud blocking cover 25. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solutions in the embodiments of the present invention 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, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0023] See attached Figure 1As shown, a deep-water submersible electric pump of the present invention comprises a submersible motor 1 arranged vertically upward and a bracket 2 arranged at the upper end of the submersible motor 1, the casing of the submersible motor 1 is connected to the bracket 2 by bolts, the upper end of the bracket 2 is provided with a first pump body 3 and a second pump body 4, the first pump body 3 is fixedly connected to the upper end of the bracket 2, and the second pump body 4 is arranged at the upper end of the first pump body 3; a first impeller 5 is arranged in the first pump body 3, and a second impeller 6 is arranged in the second pump body 4, the first impeller 5 and the second impeller 6 are both sleeved on a pump shaft 7, and the pump shaft 7 passes through the second pump body 4, the first pump body 4 and the second pump body 4 in sequence. A pump body 3 is connected to the rotor of the submersible motor 1 through a coupling 21; a first water inlet pipe 8 is provided on the lower side of the first pump body 3, a second water inlet pipe 9 is provided on the lower side of the second pump body 4, a first drain pipe 10 is provided on the upper side of the first pump body 3, and a second drain pipe 11 is provided on the upper side of the second pump body 4; the output end of the first drain pipe 10 is respectively connected to the lower end of the second pump body 4 and the third drain pipe 12, and the output end of the second drain pipe 11 is also connected to the third drain pipe 12; a check valve 22 is provided on the first water inlet pipe 8, the first drain pipe 10 and the second drain pipe 11; The diameters of the first drain pipe 10 and the second drain pipe 11 are equal, and the diameters of the first drain pipe 10 and the second drain pipe 11 are smaller than the diameter of the third drain pipe 12; the second water inlet pipe 9 is provided with a first switch valve 13, a second switch valve 14 is provided between the first drain pipe 10 and the second pump body 4, and a third switch valve 15 is provided between the first drain pipe 10 and the third drain pipe 12; the pump shaft 7 and the first pump body 3 as well as the pump shaft 7 and the second pump body 4 are connected via a bearing 16, and a sealing ring 17 is also provided between the pump shaft 7 and the first pump body 3 as well as between the pump shaft 7 and the second pump body 4; The pump shaft 7 is also provided with two auxiliary impellers 18, one of which is arranged in the first pump body 3, and the other is arranged in the second pump body 4; an air bag 19 is provided at the upper end of the second pump body 4, and the second pump body 4 is connected to the air bag 19 through a flexible connecting rope 20; a load-bearing base 23 is provided under the submersible motor 1, and the load-bearing base 23 is connected to the bracket 2 through a connecting rod 24; the water inlets of the first water inlet pipe 8 and the second water inlet pipe 9 are higher than the submersible motor 1, and the water inlets of the first water inlet pipe 8 and the second water inlet pipe 9 are both provided with mud blocking covers 25.

[0024] Working principle: before the deepwater submersible electric pump of the present invention works, the air bag 19 is filled with gas, and then the whole deepwater submersible electric pump is put into the water. Due to the buoyancy, the air bag 19 will float on the water surface, and the deepwater submersible electric pump is always in a position near the water level. Since the deepwater submersible electric pump is near the water level, the water pressure is relatively low, and the pressure on the surface of the pump body is also relatively small. The surface of the pump body does not need to be designed to resist pressure, thereby virtually reducing the cost; at the same time, the deepwater submersible electric pump is always near the water level. Compared with the prior art that the deepwater submersible electric pump is always set at the bottom of the water, the head is reduced, the drainage power is saved, and the drainage flow rate is increased; and it also avoids the damage to the pump body caused by underwater sludge and particulate impurities entering the water pump; in the period of time just after pumping water, the water level is relatively high, and the head of the deepwater submersible electric pump is also relatively low. By opening the first switch valve 13 and the third switch valve 15, and closing the second switch valve 14, the first water inlet pipe 8, the second water inlet pipe 9 Pumping work is carried out simultaneously to form a dual-pump parallel drainage mode with low head and large flow; during the working process, as the water level slowly decreases, the head of the deep-water submersible electric pump also increases. The pressure of the dual-pump parallel drainage mode is not enough to meet the high head requirement, so dual-pump series drainage is required. At this time, the first switch valve 13 and the third switch valve 15 can be closed and the second switch valve 14 can be opened. After the water enters from the first water inlet pipe 8, it is pressurized by the first impeller 5 in the first pump body 3 and then discharged from the first drainage pipe 10 to the second pump body 4. It is increased by the second impeller 6 in the second pump body 4 and then discharged from the second drainage pipe 11 and the third drainage pipe 12. The dual-pump series mode increases the drainage pressure and then increases the drainage head, which is suitable for deep-water drainage operations; when the device of the present invention switches the working mode, there is no need to disassemble and install the equipment again, which improves the efficiency and continuity of operation, saves time, and avoids unnecessary damage to the equipment during the disassembly process.

[0025] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A deep-water submersible electric pump, comprising a submersible motor (1) arranged vertically upward and a bracket (2) arranged at the upper end of the submersible motor (1), characterized in that: A first pump body (3) and a second pump body (4) are provided at the upper end of the bracket (2); the first pump body (3) is fixedly connected to the upper end of the bracket (2); the second pump body (4) is arranged at the upper end of the first pump body (3); a first impeller (5) is provided in the first pump body (3); a second impeller (6) is provided in the second pump body (4); the first impeller (5) and the second impeller (6) are both sleeved on a pump shaft (7); the pump shaft (7) passes through the second pump body (4), the first pump body (5), and the second impeller (6) in sequence. The first pump body (3) is connected to the rotor of the submersible motor (1); a first water inlet pipe (8) is provided on the lower side of the first pump body (3), a second water inlet pipe (9) is provided on the lower side of the second pump body (4), a first drain pipe (10) is provided on the upper side of the first pump body (3), and a second drain pipe (11) is provided on the upper side of the second pump body (4); the output end of the first drain pipe (10) is respectively connected to the lower end of the second pump body (4) and the third drain pipe (12), and the second drain pipe ( The output end of the pump (11) is also connected to the third drain pipe (12); the second water inlet pipe (9) is provided with a first switch valve (13); a second switch valve (14) is provided between the first drain pipe (10) and the second pump body (4); a third switch valve (15) is provided between the first drain pipe (10) and the third drain pipe (12); the pump shaft (7) and the first pump body (3) and the pump shaft (7) and the second pump body (4) are connected via a bearing (16), and the pump A sealing ring (17) is also provided between the shaft (7) and the first pump body (3) and between the pump shaft (7) and the second pump body (4); two auxiliary impellers (18) are also sleeved on the pump shaft (7), one of the auxiliary impellers (18) is arranged in the first pump body (3), and the other auxiliary impeller (18) is arranged in the second pump body (4); an air bag (19) is provided at the upper end of the second pump body (4), and the second pump body (4) is connected to the air bag (19) via a flexible connecting rope (20); A load-bearing base (23) is provided below the submersible motor (1), and the load-bearing base (23) is connected to the bracket (2) via a connecting rod (24); The water inlets of the first water inlet pipe (8) and the second water inlet pipe (9) are higher than the submersible motor (1), and the water inlets of the first water inlet pipe (8) and the second water inlet pipe (9) are both provided with mud blocking covers (25); The diameters of the first drain pipe (10) and the second drain pipe (11) are equal, and the diameters of the first drain pipe (10) and the second drain pipe (11) are smaller than the diameter of the third drain pipe (12).

2. A deepwater submersible electric pump according to claim 1, characterized in that: The casing of the submersible motor (1) and the bracket (2) are connected via bolts.

3. A deepwater submersible electric pump according to claim 1, characterized in that: The pump shaft (7) is connected to the rotor of the submersible motor (1) via a coupling (21).

4. A deepwater submersible electric pump according to claim 1, characterized in that: The first water inlet pipe (8), the first drainage pipe (10) and the second drainage pipe (11) are all provided with a check valve (22).

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