Submerged pump easy to maintain

Abstract

The invention relates to the field of pumping equipment, and discloses a submerged pump easy to maintain, which comprises a pump body, a filter assembly, a container and a cleaning assembly, the filter assembly comprises a filter screen covering a water inlet in the lower end of the pump body and a cover cylinder surrounding the peripheral side of the filter screen, and a grating is arranged on the outer wall of the upper side of the cover cylinder; the container is arranged below the filtering assembly, and the bottom of the cover cylinder is communicated with the container through the opening; the cleaning assembly comprises a swing arm arranged in the cover cylinder and connected with a rotary main shaft of the pump body, and the two ends of the swing arm are each in sliding connection with a brush located on the peripheral side of the filter screen. The swing arm is further provided with a first elastic piece used for pushing the two sets of brushes to abut against the outer wall of the filter screen. According to the submerged pump easy to maintain, the rotary main shaft of the pump body drives the brush to rotate and clean particle impurities adsorbed on the surface layer of the filter screen, and the particle impurities fall into and are sealed in the container below along the opening and are cleaned regularly.

Description

Technical Field

[0001] The invention relates to the field of pumping equipment, in particular to a submersible pump which is easy to maintain. Background Art

[0002] A certain amount of industrial wastewater is generated in the production process of chemical agents. The above industrial wastewater needs to undergo a series of physical and chemical treatments to separate and extract harmful or reusable substances in the wastewater, and then the treated water is discharged or recycled. Usually, a submersible pump is needed to pump the wastewater stored in the pool into the relevant treatment equipment. Since the water contains a certain amount of granular impurities such as gel, the granular impurities can easily clog the filtering facilities at the water inlet of the submersible pump during the pumping process, causing the pump to have a reduced working efficiency, and even affecting its service life due to excessive load on the pump motor.

[0003] At present, there is a type of technology that can automatically clean the pump body filter in the existing patents. However, most of the above patented technologies simply scrape off the particulate impurities on the surface of the filter, and do not have the function of collecting particulate impurities, causing the particulate impurities to remain in the pool. In subsequent pumping operations, the concentration of particulate impurities in the water body will continue to increase, causing the particulate impurities to be easily adsorbed on the surface of the filter again in a short period of time, affecting the work and maintenance efficiency of the pump body. Summary of the invention

[0004] The purpose of the present invention is to overcome the disadvantages of the background technology and provide a submersible pump which is easy to clean the particle impurities adhering to the filter screen, so as to facilitate the maintenance of the submersible pump.

[0005] The embodiments of the present invention are implemented by the following technical solutions: An easy-to-maintain submersible pump comprising: The pump body is arranged in the water tank; A filter assembly, comprising a filter screen covered on the water inlet at the lower end of the pump body and a cover tube surrounding the outer peripheral side of the filter screen, wherein a grille is provided on the upper outer wall of the cover tube; A container is disposed below the filter assembly, and the bottom of the cover tube is connected to the container through an opening; The cleaning assembly includes a swing arm arranged in the cover cylinder and connected to the rotating main shaft of the pump body. The two ends of the swing arm are slidably connected to a group of brushes located on the outer peripheral side of the filter. The swing arm is also provided with a first elastic member for pushing the two groups of brushes to resist the outer wall of the filter.

[0006] Furthermore, the pump body is supported in the water pool by a lifting mechanism; the container is arranged at the bottom of the water pool, and the outer wall of the cover tube is connected to the inner wall of the container in a socket manner, so that the lower side of the cover tube can extend into / slide out of the container.

[0007] Furthermore, the bottom of the container has a drain pipe which is socket-sealed in the bottom drain port of the pool; A first sealing plug is provided on the opening, a second sealing plug is provided in the drain pipe, and a driving assembly is provided in the container for selectively opening / closing the first sealing plug and the second sealing plug.

[0008] Furthermore, the driving assembly comprises: A driving part, which is arranged at the bottom of the cover tube and extends downward into the container; An extension shaft, slidably connected up and down between the rotary main shaft and the first sealing plug; A second elastic member, connected between the drain pipe and the second sealing plug, for driving the second sealing plug to seal the drain pipe; A sliding member, horizontally slidably connected in the container, the sliding member having a first wedge-shaped surface capable of slidingly contacting the driving portion; the sliding member having a long strip hole extending up and down in an inclined direction; Wherein, the side wall of the second sealing plug is slidably embedded in the elongated hole, so that when the driving part drives the sliding member to slide, the second sealing plug slides up and disengages from the drain pipe, and the second sealing plug pushes up the first sealing plug to close the opening.

[0009] Furthermore, a liquid outlet port of the pump body is connected to a liquid outlet pipe and a return pipe via a three-way structure; wherein the return pipe is located below the liquid outlet pipe, and the other end of the liquid outlet pipe is connected to the container; a valve assembly is provided in the three-way structure to connect the liquid outlet port with the return pipe when the drain pipe is opened.

[0010] Furthermore, the valve assembly comprises: A third sealing plug, disposed at the top of the reflux pipe, the third sealing plug being supported by a third elastic member so as to disconnect the liquid outlet from the reflux pipe; A push rod, wherein the sliding member has a second wedge-shaped surface opposite to the first wedge-shaped surface in the sliding direction, the upper end of the push rod is connected to the third sealing plug and the lower end is in sliding contact with the second wedge-shaped surface to push the third sealing plug into the liquid outlet pipe.

[0011] Furthermore, the upper end of the pump body is supported above the water pool through a lifting mechanism.

[0012] Furthermore, the lifting mechanism includes a screw pair installed above the water pool, the screw pair includes a vertically arranged screw rod and a slider arranged on the screw rod, and the upper end of the pump body is installed on the slider.

[0013] Furthermore, a coupling cylinder is provided at the lower end of the rotary main shaft, and the two groups of brushes are provided with a limiting member slidably inserted into the coupling cylinder; The extension shaft is passed through the coupling cylinder, and the outer wall of the extension shaft has a limiting groove for accommodating the limiting member, so that the first sealing plug arranged at the lower end of the extension shaft can be sealed on the opening; a fourth elastic member connected to the extension shaft is arranged in the coupling cylinder, so that after the limiting member is separated from the limiting groove, the extension shaft can drive the first sealing plug to separate from the opening.

[0014] Furthermore, a limiting shaft is provided on the swing arm to limit the maximum eccentric distance of the brush.

[0015] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects: In the easy-to-maintain submersible pump of the present invention, the first elastic member pushes the brush to contact the outer wall of the filter screen. During the start / stop process of the pump body, the brush is driven by the rotating main shaft of the pump body to rotate and clean the particle impurities adsorbed on the surface of the filter screen, and the particles fall into the container below along the opening; When the rotating spindle of the pump reaches the rated speed, the brush can automatically detach from the surface of the filter due to the centrifugal force, thus avoiding the wear of the filter and the brush and prolonging the service life of the cleaning components and the filter. When the pump body rotates at the rated speed and the main shaft is in normal operation, the particle impurities are sealed in the container by the sealing plug and are not easily adsorbed on the filter screen again, thus reducing the concentration of particle impurities in the pool water; The convenience of filter and pump maintenance is improved by automatically cleaning and sealing the particulate impurities adsorbed on the filter of the submersible pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the use status of the easy-to-maintain hydraulic pump provided by an embodiment of the present invention; Figure 2 A schematic diagram of the assembly relationship between the filter assembly and the container provided in an embodiment of the present invention; Figure 3 A three-dimensional diagram of an easy-to-maintain hydraulic pump provided by an embodiment of the present invention; Figure 4 A schematic diagram of the internal structure of a container provided by an embodiment of the present invention; Figure 5 A three-dimensional diagram of a cleaning assembly provided by an embodiment of the present invention; Icons: 1-water pool, 10-bottom outlet, 2-pump body, 20-liquid outlet, 21-liquid outlet pipe, 22-reflux pipe, 3-container, 30-drain pipe, 31-second sealing plug, 310-guide shaft, 32-second elastic member, 4-lifting mechanism, 40-screw rod, 41-slider, 5-filter assembly, 50-filter screen, 51-cover cylinder, 510-drive unit, 511-grid, 52-bottom plate, 520-opening , 6-cleaning assembly, 60-swing arm, 600-limiting shaft, 61-brush, 62-first elastic member, 63-limiting member, 7-coupling assembly, 70-coupling cylinder, 71-extension shaft, 710-limiting groove, 72-first sealing plug, 8-sliding member, 80-long hole, 81-first wedge surface, 82-second wedge surface, 9-valve assembly, 90-third sealing plug, 91-third elastic member, 92-top rod. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] The present invention provides a submersible pump that is easy to maintain, including a pump body 2, a container 3, a lifting mechanism 4, a filter assembly 5, a cleaning assembly 6 and other functional parts; wherein, with reference to Figure 1 The upper end of the pump body 2 is a motor and the lower end is a centrifugal pump. The centrifugal pump is located below the liquid level in the water pool 1, and the motor is located above the liquid level. The liquid outlet pipe 21 arranged on the centrifugal pump extends above the water pool 1. The motor transmits power to the centrifugal pump through the rotating main shaft so that the liquid in the water pool 1 can be pumped out along the liquid outlet pipe 21.

[0019] Among them, the lifting mechanism 4 is supported above the water pool 1, and the upper end of the pump body 2 is installed on the lifting mechanism 4. In the face of changes in the water level in the water pool 1, the height of the pump body 2 in the water pool 1 can be adjusted up and down, so that the centrifugal pump at the lower end of the pump body 2 can always be immersed in the liquid in the water pool 1.

[0020] It is easy to understand that the lifting mechanism 4 can be a cylinder, a hydraulic cylinder, an electric cylinder, a scissors fork, or any other mechanism that can achieve up and down extension under a certain load; for example, the lifting mechanism 4 can also be a screw pair, that is, refer to Figure 3 The screw pair includes a vertically arranged screw rod 40 and a slider 41 arranged on the screw rod 40, and the upper end of the pump body 2 is installed on the slider 41. The screw pair can drive the pump body 2 to rise and fall at a relatively stable speed.

[0021] Reference Figure 2The filter assembly 5 includes a filter screen 50 which is covered on the water inlet at the lower end of the pump body 2 and a cover tube 51 which surrounds the outer peripheral side of the filter screen 50, and a grille 511 is provided on the upper outer wall of the cover tube 51; the aperture of the grille 511 is larger than the aperture of the filter screen 50, and the grille 511 can intercept large particles of impurities in the liquid of the pool 1 to prevent the impurities from entering the interior of the cover tube 51 and causing large-area blockage of the surface of the filter screen 50.

[0022] Generally, the number of large particles of impurities in the liquid in the water pool 1 is small, and after the pump body 2 stops pumping, the large particles of impurities adsorbed on the grille 511 will fall off the grille 511 and sink due to their own weight. Therefore, the grille 511 generally does not cause blockage that affects the operation of the pump body 2; since the holes of the filter 50 are finer than the holes of the grille 511, the small particles of impurities that pass through the grille 511 and enter the cover tube 51 will be adsorbed on the filter 50, especially the gel impurities have a certain elasticity, and it is difficult to fall off after being adsorbed in the holes of the filter 50, and they need to be cleaned by the cleaning component 6.

[0023] Reference Figure 2 The cleaning assembly 6 includes a swing arm 60 arranged in the cover tube 51, and the rotating main shaft of the pump body 2 passes down along the middle part of the filter screen 50 to the outside of the filter screen 50. The upper end of the swing arm 60 is installed on the rotating main shaft through a connecting structure, so that the swing arm 60 can rotate around the rotating main shaft and the center of the filter screen 50; wherein, the two ends of the swing arm 60 are slidably connected to a group of brushes 61 located on the outer peripheral side of the filter screen 50, and the lower seat body part of the brush 61 is a counterweight structure made of metal; a first elastic member 62 is also provided on the swing arm 60, when the swing arm 60 is not rotating, the first elastic member 62 can push the two groups of brushes 61 to resist the outer wall of the filter screen 50; and during the rotation of the swing arm 60, the brush 61 is subjected to the action of centrifugal force, overcomes the action of the first elastic member 62 and gradually slides centrifugally toward the end direction of the swing arm 60, so that the brush 61 is separated from the surface of the filter screen 50.

[0024] Therefore, it is easy to understand that within a few tens of seconds after the pump body 2 is started and before the rotating spindle reaches the rated speed, the brush 61 will complete the cleaning operation on the outer wall of the filter screen 50 during several turns of rotation; and when the pump body 2 is shut down to slow down the rotating spindle, the brush 61 will complete the cleaning operation on the outer wall of the filter screen 50 again during the rotation process; through the above two sets of operation processes, the particulate impurities adhered to the surface of the filter screen 50 can be brushed off.

[0025] As for the arrangement of the first elastic member 62, it is easy to understand that the first elastic member 62 can be a tension spring connected between the brush 61 and the rotating main shaft; Figure 5 The first elastic member 62 may also be a compressed spring disposed between the end of the swing arm 60 and the brush 61 .

[0026] In addition, refer to Figure 5 The counterweight structure on the lower side of the brush 61 is sleeved on the swing arm 60, and a long hole is provided on the counterweight structure. The swing arm 60 is provided with a limiting shaft 600 located in the limiting hole to limit the maximum eccentric distance that the brush 61 can slide out, thereby preventing the brush 61 from detaching from the swing arm 60.

[0027] Reference Figure 2 The bottom of the cover tube 51 is provided with a bottom plate 52 with a concave middle portion, and an opening 520 is provided in the middle of the bottom plate 52, so that the particulate impurities cleaned by the cleaning component 6 fall along the opening 520 below; and the container 3 is arranged below the filter component 5, and the bottom of the cover tube 51 is connected with the container 3 through the opening 520, so that the particulate impurities fall into the container 3.

[0028] Among them, since the opening 520 occupies a small area on the bottom plate 52, the probability of the particulate impurities falling into the container 3 entering the cover tube 51 again is significantly reduced. Therefore, the container 3 has a good collection effect on the particulate impurities.

[0029] For example, the container 3 and the filter assembly 5 can be installed at the bottom of the pump body 2 and rise and fall synchronously with the pump body 2. When the particulate impurities in the container 3 reach a certain amount, the container 3 can be moved above the liquid surface with the help of the lifting mechanism 4 and can be manually removed and cleaned.

[0030] In one embodiment, in order to improve the convenience of cleaning the particle impurities in the container 3, it is considered to use the bottom discharge port 10 at the bottom of the pool 1 to discharge the particle impurities in the container 3, which is achieved in the following way: Reference Figure 1 The bottom of the container 3 is locked to the bottom of the pool 1 by fasteners, and the bottom of the container 3 has a drain pipe 30 that is socket-sealed in the bottom outlet 10 of the pool 1, that is, the outer wall surface of the drain pipe 30 is sealed with the inner wall surface of the bottom outlet 10; the outer wall of the cover tube 51 is socket-connected with the inner wall of the container 3, so that the lower side of the cover tube 51 can extend into / slide out of the container 3, that is, the filter assembly 5 can be inserted into or pulled out of the container 3 as the pump body 2 rises and falls.

[0031] Optionally, during the socket connection between the container 3 and the cover tube 51, in order to reduce the overflow of liquid and particulate impurities along the gap between the contact surfaces of the two, a rubber layer may be provided on the outer wall of the cover tube 51 to increase the sealing performance.

[0032] Reference Figure 1, wherein a first sealing plug 72 is provided on the opening 520, a second sealing plug 31 is provided in the drain pipe 30, and a driving assembly is provided in the container 3 to selectively open / close the first sealing plug 72 and the second sealing plug 31; that is, when the first sealing plug 72 is opened, the second sealing plug 31 is closed, allowing particulate impurities to enter the container 3; when the first sealing plug 72 is closed, the second sealing plug 31 is opened, and the particulate impurities in the container 3 are discharged along the bottom discharge port 10.

[0033] Among them, the driving component can be valves respectively installed in the opening 520 and the drain pipe 30, and the two groups of valves are independently controlled; or, the first sealing plug 72 is arranged below the opening 520 and the second sealing plug 31 is arranged above the drain pipe 30, the first sealing plug 72 and the second sealing plug 31 are installed on the same set of vertical axes, and the distance between the first sealing plug 72 and the second sealing plug 31 is smaller than the distance between the opening 520 and the drain pipe 30. By controlling the lifting and lowering of the vertical axis through the telescopic device, the first sealing plug 72 and the second sealing plug 31 can be selectively opened / closed.

[0034] In addition, for example, referring to Figure 2 The driving assembly can also be configured as follows: the driving assembly includes a driving part 510, an extension shaft 71, a second elastic member 32 and a sliding member 8.

[0035] The driving portion 510 is disposed at the bottom of the cover tube 51 and extends downward into the container 3 ; that is, the driving portion 510 may be a structure extending downward from the bottom of the cover tube 51 .

[0036] The extension shaft 71 is slidably connected between the rotating main shaft and the first sealing plug 72 , that is, the upper end of the extension shaft 71 is slidably connected to the rotating main shaft, and the first sealing plug 72 is installed at the lower end of the extension shaft 71 .

[0037] The second elastic member 32 is connected between the drain pipe 30 and the second sealing plug 31 to drive the second sealing plug 31 to seal the drain pipe 30; Figure 2 The second elastic member 32 is a tension spring arranged at the lower end of the second sealing plug 31, which pulls the second sealing plug 31 downward to seal the upper end opening of the drain pipe 30.

[0038] The sliding member 8 is horizontally slidably connected in the container 3, referring to Figure 2 The sliding member 8 can be horizontally slidable left and right at the bottom of the container 3; the sliding member 8 has a first wedge surface 81 that can slide in contact with the driving part 510; the cover tube 51 moves downward to squeeze the first wedge surface 81 through the driving part 510, so that the sliding member 8 moves along Figure 2 Move to the left in the

[0039] Among them, refer to Figure 2 and Figure 4The sliding member 8 has a long hole 80 extending up and down in a slanting direction. When the second sealing plug 31 is sealed on the drain pipe 30, the guide shafts 310 on the two side walls of the second sealing plug 31 are slidably embedded in the lower end of the long hole 80; Figure 2 When sliding on the left side, the second sealing plug 31 can be driven to slide upward through the long hole 80 and the guide shaft 310 .

[0040] During the upward sliding process of the second sealing plug 31, the lower end of the second sealing plug 31 is separated from the drain pipe 30, and at the same time, the second sealing plug 31 pushes the first sealing plug 72 upward to close the opening 520; and when the driving part 510 slides up and separates from the first wedge surface 81, under the elastic force of the second elastic member 32, the second sealing plug 31 is driven to move downward and seal the drain pipe 30; and the extension shaft 71 falls due to its own weight, driving the first sealing plug 72 to separate from the opening 520.

[0041] Among them, in order to make the second sealing plug 31 move more smoothly and align with the drain pipe 30 during the up and down movement, optionally, two groups of vertical guide rods can be passed through the extension structure on the outer peripheral side of the second sealing plug 31, and the guide rods are fixed to the inner bottom of the container 3, so as to provide guidance for the up and down sliding of the second sealing plug 31; or, a drainage groove is opened on the lower side wall of the second sealing plug 31, and the second sealing plug 31 only needs to partially detach from the drain pipe 30 during the upward movement, so that the drainage groove is connected with the container 3. At this time, the second sealing plug 31 is not completely detached from the drain pipe 30 and can move up and down smoothly.

[0042] Therefore, when the particulate impurities in the container 3 in the embodiment of the present invention need to be cleaned, the pump body 2 only needs to be driven downward by the lifting mechanism 4 so that the cover tube 51 extends into the container 3; after cleaning, the pump body 2 is driven by the lifting mechanism 4 to move upward and reset.

[0043] To further enhance the functionality of the pump body 2, in one embodiment, reference Figure 5 , the lower end of the rotary main shaft is connected to the cleaning assembly 6 through the coupling assembly 7. Specifically, the coupling assembly 7 includes a coupling cylinder 70, which is sleeved on the bottom of the rotary main shaft and can be locked and connected by a threaded pin; the extension shaft 71 is inserted into the coupling cylinder 70, and the outer wall of the extension shaft 71 has a limiting groove 710, which is a ring groove structure; and the two groups of brushes 61 are provided with limiting members 63 that are slidably inserted into the coupling cylinder 70; when the extension shaft 71 is retracted upward into the coupling cylinder 70, the limiting member 63 is inserted into the limiting groove 710 to prevent the extension shaft 71 from moving downward. At this time, refer to Figure 2 , the first sealing plug 72 at the lower end of the extension shaft 71 is sealed on the opening 520; and a fourth elastic member (not shown) connected to the extension shaft 71 is provided in the coupling cylinder 70, so that after the limiting member 63 is separated from the limiting groove 710, the fourth elastic member pushes the extension shaft 71 to drive the first sealing plug 72 to separate from the opening 520.

[0044] Through the above arrangement, compared with the extension shaft 71 sliding down under its own weight to cause the first sealing plug 72 to disengage from the opening 520, the fourth elastic member pushes the extension shaft 71 to cause the first sealing plug 72 to disengage from the opening 520 more reliably, making it easier to open the opening 520 after the pump body 2 is started.

[0045] When the cover tube 51 is inserted downward into the container 3, the drain pipe 30 is opened to discharge the particulate impurities. During this process, the upward movement of the second sealing plug 31 can drive the extension shaft 71 to retract into the coupling tube 70. After the pump body 2 is stopped, Figure 5 The limiting member 63 shown in the figure can be reinserted into the limiting groove 710 so that the extension shaft 71 is constrained by the limiting member 63 again. Then, when the pump body 2 drives the cover cylinder 51 to move upward, the opening 520 is sealed by the first sealing plug 72.

[0046] In addition, after the drain pipe 30 of the container 3 is opened, some granular impurities will still accumulate in the container 3, which is difficult to clean.

[0047] Therefore, refer to Figure 2 In one embodiment, the liquid outlet 20 of the pump body 2 is connected to a liquid outlet pipe 21 and a return pipe 22 through a three-way structure, wherein the return pipe 22 is located below the liquid outlet pipe 21, and the lower end of the liquid outlet pipe 21 is connected to the container 3; a valve assembly 9 is provided in the three-way structure to connect the liquid outlet 20 with the return pipe 22 when the drain pipe 30 is opened, so as to flush the residual particulate impurities in the container 3 with part of the pumped liquid.

[0048] For example, refer to Figure 2 The valve assembly 9 includes a third sealing plug 90 and a push rod 92; wherein, the third sealing plug 90 is arranged at the top of the reflux pipe 22, and a third elastic member 91 is arranged in the liquid outlet pipe 21, and the third elastic member 91 presses down the third sealing plug 90 to disconnect the liquid outlet 20 from the reflux pipe 22, and the liquid outlet pipe 21 is normally connected to the liquid outlet 20.

[0049] In addition, the sliding member 8 has a second wedge surface 82 opposite to the first wedge surface 81 in the sliding direction, the upper end of the push rod 92 is connected to the third sealing plug 90, and the lower end of the third sealing plug 90 is in sliding contact with the second wedge surface 82; Figure 2 While moving to the left to open the drain pipe 30 , the third sealing plug 90 is pushed into the liquid outlet pipe 21 to connect the reflux pipe 22 with the liquid outlet 20 , and the pumped liquid enters the container 3 for flushing, so that the granular impurities are discharged along the drain pipe 30 .

[0050] When the container 3 is completely discharged, the pump body 2 drives the cover tube 51 to move upward to reconnect the liquid outlet pipe 21 with the liquid outlet 20 .

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A submersible pump that is easy to maintain, characterized in that: include: The pump body is arranged in the water tank; A filter assembly, comprising a filter screen covered on the water inlet at the lower end of the pump body and a cover tube surrounding the outer peripheral side of the filter screen, wherein a grille is provided on the upper outer wall of the cover tube; A container is disposed below the filter assembly, and the bottom of the cover tube is connected to the container through an opening; The cleaning assembly includes a swing arm arranged in the cover cylinder and connected to the rotating main shaft of the pump body. The two ends of the swing arm are slidably connected to a group of brushes located on the outer peripheral side of the filter. The swing arm is also provided with a first elastic member for pushing the two groups of brushes to resist the outer wall of the filter.

2. The easy-to-maintain submersible pump according to claim 1, characterized in that: The pump body is supported in the water pool by a lifting mechanism; the container is arranged at the bottom of the water pool, and the outer wall of the cover tube is connected to the inner wall of the container by a socket connection, so that the lower side of the cover tube can extend into / slide out of the container.

3. The easy-to-maintain submersible pump according to claim 2, characterized in that: The bottom of the container has a drain pipe which is socket-sealed in the bottom drain port of the pool; A first sealing plug is provided on the opening, a second sealing plug is provided in the drain pipe, and a driving assembly is provided in the container for selectively opening / closing the first sealing plug and the second sealing plug.

4. The easy-to-maintain submersible pump according to claim 3, characterized in that: The drive assembly comprises: A driving part, which is arranged at the bottom of the cover tube and extends downward into the container; An extension shaft, slidably connected up and down between the rotary main shaft and the first sealing plug; A second elastic member, connected between the drain pipe and the second sealing plug, for driving the second sealing plug to seal the drain pipe; A sliding member, horizontally slidably connected in the container, the sliding member having a first wedge-shaped surface capable of slidingly contacting the driving portion; the sliding member having a long strip hole extending up and down in an inclined direction; Wherein, the side wall of the second sealing plug is slidably embedded in the elongated hole, so that when the driving part drives the sliding member to slide, the second sealing plug slides up and disengages from the drain pipe, and the second sealing plug pushes up the first sealing plug to close the opening.

5. The easy-to-maintain submersible pump according to claim 4, characterized in that: The liquid outlet of the pump body is connected to a liquid outlet pipe and a return pipe through a three-way structure; wherein the return pipe is located below the liquid outlet pipe, and the other end of the liquid outlet pipe is connected to the container; a valve assembly is provided in the three-way structure to connect the liquid outlet with the return pipe when the drain pipe is opened.

6. The easy-to-maintain submersible pump according to claim 5, characterized in that: The valve assembly comprises: A third sealing plug, disposed at the top of the reflux pipe, the third sealing plug being supported by a third elastic member so as to disconnect the liquid outlet from the reflux pipe; A push rod, wherein the sliding member has a second wedge-shaped surface opposite to the first wedge-shaped surface in the sliding direction, the upper end of the push rod is connected to the third sealing plug and the lower end is in sliding contact with the second wedge-shaped surface to push the third sealing plug into the liquid outlet pipe.

7. The easy-to-maintain submersible pump according to any one of claims 2 to 6, characterized in that: The upper end of the pump body is supported above the water pool through a lifting mechanism.

8. The easy-to-maintain submersible pump according to claim 7, characterized in that: The lifting mechanism comprises a screw pair installed above the water pool, the screw pair comprises a vertically arranged screw rod and a slider arranged on the screw rod, and the upper end of the pump body is installed on the slider.

9. The easy-to-maintain submersible pump according to any one of claims 4 to 6, characterized in that: A coupling cylinder is provided at the lower end of the rotary main shaft, and the two groups of brushes are provided with limiting members that are slidably inserted into the coupling cylinder; The extension shaft is passed through the coupling cylinder, and the outer wall of the extension shaft has a limiting groove for accommodating the limiting member, so that the first sealing plug arranged at the lower end of the extension shaft can be sealed on the opening; a fourth elastic member connected to the extension shaft is arranged in the coupling cylinder, so that after the limiting member is separated from the limiting groove, the extension shaft can drive the first sealing plug to separate from the opening.

10. The easy-to-maintain submersible pump according to claim 1, characterized in that: The swing arm is also provided with a limiting shaft for limiting the maximum centrifugal distance of the brush.

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