CN109763983B

CN109763983B - Immersed pump

Info

Publication number: CN109763983B
Application number: CN201910006708.0A
Authority: CN
Inventors: 杨勤; 张聪; 沈飞; 王建国; 孟昭燃; 方兵
Original assignee: Wuhan Marine Machinery Plant Co Ltd
Current assignee: Wuhan Marine Machinery Plant Co Ltd
Priority date: 2019-01-04
Filing date: 2019-01-04
Publication date: 2021-06-08
Anticipated expiration: 2039-01-04
Also published as: CN109763983A

Abstract

The invention discloses an immersed pump. The immersed pump comprises a water outlet pipe, a motor, a shell, a water inlet pipe, a balance drum, an impeller and an inducer, wherein the shell is cylindrical, the first end of the shell is connected with the water inlet pipe, the second end of the shell is connected with the water outlet pipe, the motor is arranged in the shell, an axial flow channel for communicating the water inlet pipe with the water outlet pipe is formed between the shell of the motor and the shell, the balance drum, the impeller and the inducer are coaxially connected to a rotating shaft of the motor, the impeller is positioned between the balance drum and the inducer, the impeller is positioned at the port of the first end of the shell, the inducer is positioned in the water inlet pipe and comprises a sleeve and three spiral blades, the sleeve is coaxially sleeved on the rotating shaft of the motor, the three spiral blades are uniformly distributed on the sleeve along the circumferential direction of the sleeve, the tip wrap angle of the three spiral blades is larger than, the cavitation of the immersed pump can be well reduced, and the service life of the immersed pump is prolonged.

Description

Immersed pump

Technical Field

The invention relates to the field of pumps, in particular to an immersed pump.

Background

The immersed pump is a pump immersed in a cargo tank of an oil tanker for liquid cargo transmission, and is widely applied to oil tankers such as finished oil tankers and chemical tankers.

The immersed pump generally includes a housing, a motor disposed in the housing, and an impeller mounted at a bottom end of a rotating shaft of the motor and immersed in the liquid cargo, wherein the impeller is driven by the motor to rotate during operation of the immersed pump, so as to pump out the liquid cargo.

When the immersed pump works, cavitation can be generated, and the service life of the immersed pump is influenced.

Disclosure of Invention

The embodiment of the invention provides an immersed pump, which can reduce cavitation of the immersed pump and prolong the service life. The technical scheme is as follows:

the embodiment of the invention provides an immersed pump which comprises a water outlet pipe, a motor, a shell, a water inlet pipe, a balance drum, an impeller and an inducer, wherein the shell is cylindrical, the first end of the shell is connected with the water inlet pipe, the second end of the shell is connected with the water outlet pipe, the motor is arranged in the shell, an axial flow passage for communicating the water inlet pipe with the water outlet pipe is formed between a shell of the motor and the shell, the balance drum, the impeller and the inducer are coaxially connected on a rotating shaft of the motor, the impeller is positioned between the balance drum and the inducer, the impeller is positioned at a port of the first end of the shell, the inducer is positioned in the water inlet pipe, the inducer comprises a sleeve and three spiral blades which are screwed in the axial direction of the sleeve, the sleeve is coaxially sleeved on the rotating shaft of the motor, the three helical blades are uniformly distributed on the sleeve along the circumferential direction of the sleeve, and the tip wrap angle of the three helical blades is larger than 360 degrees.

Optionally, the tip wrap angles of the three helical blades are 523 ° to 525 °.

Optionally, the leads of the three helical blades are all 137.5 mm-138.0 mm.

Optionally, the normal thickness of the tips of the three helical blades is 1.9mm to 2.1 mm.

Optionally, the inlet edges of the three helical blades have a thickness of no more than 1 mm.

Optionally, the motor further comprises a displacement sensor for detecting axial displacement of the rotating shaft of the motor.

Optionally, still include the sensor support, the sensor support includes sensor mount pad and a plurality of connecting rods, the one end of a plurality of connecting rods with the sensor mount pad is connected, the other end of a plurality of connecting rods with the pipe wall connection of inlet tube, displacement sensor sets up on the sensor mount pad, displacement sensor is located on the axis of the pivot of motor.

Optionally, the sensor holder comprises three connecting rods, the three connecting rods being arranged along a radial direction of the water inlet pipe.

Optionally, one of the connecting rods has an axial through hole extending along an axial direction of the connecting rod, and the lead connected to the displacement sensor is located in the axial through hole.

Optionally, the rotating shaft of the motor extends out of the first end of the shell of the motor, a damping hole is formed in the second end of the shell of the motor, and the damping hole is communicated with the shell of the motor and the water outlet pipe.

According to the embodiment of the invention, the water inlet pipe and the water outlet pipe are respectively connected with the two ends of the shell, the motor is arranged in the shell, and the axial flow channel is formed between the shell of the motor and the shell and is communicated with the water inlet pipe and the water outlet pipe, so that liquid sucked by the water inlet pipe can enter the water outlet pipe through the axial flow channel. The balance drum is arranged on the rotating shaft of the motor, so that the balance drum can balance the axial force applied to the rotating shaft of the motor when the motor rotates. The impeller is arranged on the rotating shaft of the motor, so that liquid can be sucked in when the impeller rotates, and the liquid is thrown into the axial flow channel. The inducer is arranged on the rotating shaft of the motor, so that liquid can be sucked into the inducer, the static pressure of the inlet of the impeller is increased, and cavitation is slowed down. The inducer includes sleeve pipe and three helical blade, and the sleeve pipe can be installed the inducer in the pivot of motor, and through setting up three helical blade, three helical blade's apex cornerite all is greater than 360, and helical blade can produce better controllability to inspiratory liquid like this, has improved the stability of liquid stream, and the cavitation of reduction immersed pump that can be fine is favorable to prolonging the life of immersed pump.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a block diagram of an immersed pump according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an inducer according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an inducer according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a sensor holder according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a structural diagram of an immersed pump according to an embodiment of the present invention. As shown in fig. 1, the immersed pump includes a water outlet pipe 10, a motor 20, a housing 30, a water inlet pipe 40, a balance drum 50, an impeller 60, and an inducer 70.

The outer casing 30 is cylindrical, a first end of the outer casing 30 is connected with the water inlet pipe 40, and a second end of the outer casing 30 is connected with the water outlet pipe 10. The motor 20 is arranged in the shell 30, and an axial flow passage 30a for communicating the water inlet pipe 40 and the water outlet pipe 10 is formed between the shell of the motor 20 and the shell 30.

The balance drum 50, the impeller 60 and the inducer 70 are all coaxially connected to the rotating shaft 22 of the motor 20, and the impeller 60 is located between the balance drum 50 and the inducer 70. An impeller 60 is located at a port at the first end of the housing 30 and an inducer 70 is located in the inlet conduit 40.

Fig. 2 is a schematic structural diagram of an inducer according to an embodiment of the present invention. As shown in fig. 2, the inducer 70 includes a sleeve 71 and three helical blades 72 that are screwed in the axial direction of the sleeve 71. The sleeve 71 is coaxially sleeved on the rotating shaft 22 of the motor 20. The end surface 70a of the sleeve 71 faces the impeller 60 (i.e., the right end of the sleeve 71 shown in fig. 2 is closer to the impeller 60).

Three helical blades 72 are uniformly distributed on the sleeve 71 along the circumferential direction of the sleeve 71, and the tip wrap angle of the three helical blades 72 is larger than 360 degrees.

The water inlet pipe and the water outlet pipe are respectively connected with the two ends of the shell, the motor is arranged in the shell, an axial flow passage is formed between the shell of the motor and the shell and is communicated with the water inlet pipe and the water outlet pipe, and liquid sucked by the water inlet pipe can enter the water outlet pipe through the axial flow passage. The balance drum is arranged on the rotating shaft of the motor, so that the balance drum can balance the axial force applied to the rotating shaft of the motor when the motor rotates. The impeller is arranged on the rotating shaft of the motor, so that liquid can be sucked in when the impeller rotates, and the liquid is thrown into the axial flow channel. The inducer is arranged on the rotating shaft of the motor, so that liquid can be sucked into the inducer, the static pressure of the inlet of the impeller is increased, and cavitation is slowed down. The inducer includes sleeve pipe and three helical blade, and the sleeve pipe can be installed the inducer in the pivot of motor, and through setting up three helical blade, three helical blade's apex cornerite all is greater than 360, and helical blade can produce better controllability to inspiratory liquid like this, has improved the stability of liquid stream, and the cavitation of reduction immersed pump that can be fine is favorable to prolonging the life of immersed pump.

Alternatively, the inner wall of the sleeve 71 may be provided with a key groove 71a, and the sleeve 71 may be keyed on the rotation shaft 22 of the motor 20.

Alternatively, the tip wrap angles of the three helical blades 72 may be 523 ° to 525 °. The too small tip wrap angle of the spiral blade 72 reduces the control capability of the inducer 70 on the fluid, and the too large tip wrap angle of the spiral blade 72 increases the friction area between the spiral blade 72 and the fluid, and reduces the hydraulic efficiency of the immersed pump.

Preferably, the tip wrap angle of the three spiral blades 72 can be 524 degrees, through testing, the tip wrap angle of the three spiral blades 72 is set to 524 degrees, the inducer 70 can well reduce cavitation of the immersed pump, and the influence on the hydraulic efficiency of the immersed pump is small.

Alternatively, the leads of the three helical blades 72 may each be 137.5mm to 138.0 mm. The lead of the helical blade 72 is set too large or too small, so that the cavitation performance of the inducer 70 is reduced, the service life of the immersed pump is shortened, and the lead of the three helical blades 72 is set in the range through testing, so that the cavitation performance of the inducer 70 is better. Preferably, the lead of the three helical blades 72 may be 137.8 mm.

As shown in FIG. 2, the tips of the three helical blades 72 may each have a normal thickness d (i.e., a thickness perpendicular to the surface of the helical blade) in the range of 1.9mm to 2.1 mm. If the normal thickness d of the tip of the spiral blade 72 is too small, the strength of the spiral blade 72 is reduced, and the blade vibrates greatly during the operation of the submersible pump. The blade tip of the spiral blade 72 is set too thick, which increases the weight of the inducer 70.

The normal thickness D of the roots of the three helical blades 72 may be between 3.0mm and 4.0 mm. The normal thickness of the helical blade 72 may taper from the root to the tip.

Fig. 3 is a schematic structural diagram of an inducer according to an embodiment of the present invention. As shown in fig. 3, the thickness h of the inlet edges 72a of the three helical blades 72 is not more than 1 mm. The thickness of the inlet edge of the helical blade 72 has a large influence on the cavitation performance of the inducer 70, and the cavitation performance of the inducer 70 is good by setting the thickness of the inlet edge within 1 mm.

As shown in fig. 1, a cable duct 301 is communicated between the housing 21 of the motor 20 and the casing 30, a cable 201 connected to the motor 20 may be located in the cable duct 301, and the cable 201 of the motor 20 is led out through the cable duct 301, so as to facilitate wiring.

As shown in fig. 1, both ends of the housing 21 of the motor 20 are respectively provided with bearing seats 211, and the rotating shaft 22 of the motor 20 is mounted in the bearing seats 211 through bearings.

Referring to fig. 1, the axial length of the bearing seats 211 may be greater than the axial length of the bearings 213, bearing retainers 212 may be disposed on both bearing seats 211, the two bearing retainers 212 are disposed between the two bearing seats 211, and an axial gap is disposed between the bearing retainer 212 and the bearing 213 on at least one bearing seat 211, so that the rotating shaft 22 of the motor 20 and the bearing 213 may have an axial movement distance.

The rotating shaft 22 of the motor 20 extends out of the first end of the housing of the motor 20, and the second end of the housing of the motor 20 may be provided with a damping hole 21a, and the damping hole 21a communicates the housing of the motor 20 and the water outlet pipe 10. Since the rotating shaft 22 of the motor 20 is mounted on the housing 21 of the motor 20 through a bearing, when the immersed pump works, liquid also enters the interior of the motor 20, and through the arrangement of the damping holes 21a, the liquid continuously enters the housing 21 of the motor 20 and flows out of the damping holes 21a, and during the process that the liquid enters the interior of the motor 20 and flows out of the damping holes 21a, the bearing on which the rotating shaft 22 of the motor 20 is mounted is cooled and lubricated.

The balance drum 50 is sleeved on the rotating shaft 22 of the motor 20, the rotating shaft 22 of the motor 20 is provided with a limiting shaft shoulder 221, the rotating shaft 22 of the motor 20 is sleeved with a retaining ring 222, and the balance drum 50 is limited through the retaining ring 222 and the limiting shaft shoulder 221. The retainer ring 222 may be pressed against the balance drum 50 by a nut 223.

The balance drum 50 is located within the housing 21 of the motor 20, and the end of the housing 21 is provided with a balance drum stopper ring 51 to restrain the balance drum 50 within the housing 21.

A radial gap is left between the balancing drum 50 and the housing 21 of the motor 20, allowing the balancing drum 50 to rotate freely.

The housing 30 may include a body housing 31 and an impeller housing 32, the body housing 31 being removably attached to one end of the impeller housing 32, and the impeller 60 being located within the impeller housing 32. The casing 30 is provided with a pump body casing 31 and an impeller casing 32, so that the submersible pump can be conveniently assembled and disassembled.

As shown in fig. 1, the immersed pump may further include a displacement sensor 80, and the displacement sensor 80 is used for detecting the axial displacement of the rotating shaft 22 of the motor 20. By detecting the axial displacement of the rotating shaft 22 of the motor 20, whether the operation of the balance drum 50 is normal can be judged according to the axial displacement, and the bearing 213 is prevented from being worn due to overlarge axial displacement of the rotating shaft 22 of the motor 20. The displacement sensor 80 may be aligned with an end of the rotating shaft 22 of the motor 20 to detect an axial displacement of the rotating shaft 22 of the motor 20.

Optionally, the submersible pump may also include a sensor mount 81. Fig. 4 is a schematic structural diagram of a sensor holder according to an embodiment of the present invention. As shown in fig. 4, the sensor bracket 81 may include a sensor mounting seat 812 and a plurality of connecting rods 811, one end of each of the plurality of connecting rods 811 is connected to the sensor mounting seat 812, the other end of each of the plurality of connecting rods 811 is connected to a pipe wall of the water inlet pipe 40, the displacement sensor 80 is disposed on the sensor mounting seat 812, and the displacement sensor 80 is located on an axis of the rotating shaft 22 of the motor 20. Through connecting rod 811 and sensor mount 812 installation displacement sensor 80, sensor support 81 simple structure, easy to assemble, and shelter from lessly to the water inlet of inlet tube 40, can reduce the influence to the flow of liquid.

As shown in fig. 4, the sensor holder 81 may include three connecting rods 811 arranged in a radial direction of the water inlet pipe 40. By providing three connecting rods 811 for support, the stability of the sensor holder 81 can be ensured. The three connecting rods 811 may be spaced 120 ° apart to better reduce vibration of the displacement sensor 80.

Alternatively, one connecting rod 811 of the three connecting rods 811 may have an axial through hole 811a extending in the axial direction of the connecting rod 811, and the lead 801 to which the displacement sensor 80 is connected is located in the axial through hole 811 a. That is, one of the connecting rods 811 may be provided as a pipe, so that the cable connected to the displacement sensor 80 can be disposed inside the connecting rod 811, thereby preventing the cable from being affected by the fluid flow and ensuring the displacement sensor 80 to operate normally.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The immersed pump is characterized by comprising a water outlet pipe (10), a motor (20), a shell (30), a water inlet pipe (40), a balance drum (50), an impeller (60), an inducer (70), a displacement sensor (80) and a sensor support (81), wherein the shell (30) is cylindrical, a first end of the shell (30) is connected with the water inlet pipe (40), a second end of the shell (30) is connected with the water outlet pipe (10), the motor (20) is arranged in the shell (30), an axial flow channel (30a) for communicating the water inlet pipe (40) with the water outlet pipe (10) is formed between a shell of the motor (20) and the shell (30), the balance drum (50), the impeller (60) and the inducer (70) are coaxially connected on a rotating shaft (22) of the motor (20), and the impeller (60) is positioned between the balance drum (50) and the inducer (70), the impeller (60) is located at a port of a first end of the shell (30), the inducer (70) is located in the water inlet pipe (40), the inducer (70) comprises a sleeve (71) and three spiral blades (72) which are screwed in along the axial direction of the sleeve (71), the sleeve (71) is coaxially sleeved on the rotating shaft (22) of the motor (20), the three spiral blades (72) are uniformly distributed on the sleeve (71) along the circumferential direction of the sleeve (71), the tip wrap angle of the three spiral blades (72) is 524 degrees, the lead of the three spiral blades (72) is 137.8mm, the normal thickness of the tip of the three spiral blades (72) is 1.9 mm-2.1 mm, the normal thickness of the root of the three spiral blades (72) is 3.0 mm-4.0 mm, and the thickness of the inlet edge of the three spiral blades (72) is not more than 1mm, displacement sensor (80) are used for detecting the axial displacement of pivot (22) of motor (20), in order to judge whether the work of balance drum (50) is normal, sensor support (81) are located inlet tube (40) is kept away from the one end of shell (30), sensor support (81) include sensor mount pad (812) and a plurality of connecting rod (811), the one end of a plurality of connecting rod (811) with sensor mount pad (812) are connected, the other end of a plurality of connecting rod (811) with the pipe wall of inlet tube (40) is connected, displacement sensor (80) set up on sensor mount pad (812), displacement sensor (80) are located on the axis of pivot (22) of motor (20).

2. Immersed pump according to claim 1, characterized in that said sensor support (81) comprises three said connecting rods (811) arranged radially to said inlet pipe (40).

3. The immersed pump according to claim 2, characterized in that one of said several connecting rods (811) has an axial through hole (811a) extending in the axial direction of said connecting rod (811), said axial through hole (811a) being located with a wire (801) to which said displacement sensor (80) is connected.

4. The immersed pump according to any one of claims 1 to 3, wherein the rotating shaft (22) of the motor (20) extends out of a first end of the housing of the motor (20), and a damping hole (21a) is formed in a second end of the housing of the motor (20), and the damping hole (21a) is communicated with the housing of the motor (20) and the water outlet pipe (10).