Impeller lifting and lowering submersible pump for easy discharge of foreign substances

Abstract

The present invention relates to an impeller-raising / lowering type submersible pump that facilitates the discharge of foreign substances. An impeller (20) that rotates by being coupled to the shaft (11) of a drive motor (10) constituting a submersible pump is installed so that the impeller (20) is raised and lowered by an impeller lifting means (100) configured to include a spring (110) on the shaft (11) of the drive motor (10). In the event that various foreign substances entering the impeller (20) of a pump equipped for transporting thick debris, such as sludge containing solids or waste, at a sewage treatment plant or manure treatment plant collide with the impeller (20) during pumping operations or get stuck between the impeller (20) and the casing (30) while being transported, the impeller (20) is raised and lowered by the impeller lifting means (100) to provide a cushioning action that allows the various foreign substances to be discharged more smoothly, as well as prevent damage to various parts such as the impeller, shaft, and bearing. Alternatively, an impeller (20) that rotates by being coupled to the shaft (11) of a drive motor (10) constituting a submersible pump is installed so that the impeller (20) is raised and lowered by an impeller lifting means (100) configured to include a spring (110) on the shaft (11) of the drive motor (10), and at the same time, An impeller damage prevention device (200-1)(200-2) is further installed between the lower surface of the body of the impeller (20) constituting the above submersible pump and the upper surface of the suction cover (40) coupled to the lower side of the casing (30), Various foreign substances are smoothly discharged through the cushioning action of the impeller (20) moving up and down, and at the same time, the impeller damage prevention device (200-1)(200-2) simultaneously exhibits a cushioning action of moving up and down, By ensuring that various foreign substances are discharged more smoothly, and by further increasing the effect of preventing damage to various parts including the impeller (20), shaft (11), and bearing, and thereby preventing failure of the drive motor more efficiently, Consequently, the characteristic of the present invention is that it allows the submersible pump, which is very easy to maintain, to be used safely for a long time.

Description

Technology Field

[0001] The present invention relates to an impeller lifting and lowering type submersible pump that facilitates the discharge of foreign substances. More specifically, the invention relates to a pump equipped with an impeller for transporting thick debris, such as sludge containing solids or waste, in a sewage treatment plant or a manure treatment plant. When various foreign substances entering the pump during pumping operations collide with the impeller or get stuck between the impeller and the casing during transport, the impeller is installed to be raised and lowered by an impeller lifting means adopting a special coupling structure, thereby allowing the various foreign substances to be smoothly discharged through the cushioning action of the impeller's raising and lowering.

[0002] The present invention relates to an impeller-raising / lowering submersible pump that facilitates the discharge of foreign substances, which not only allows for the smooth discharge of foreign substances but also prevents damage to various parts such as the impeller, shaft, and bearing, thereby minimizing motor failure and making maintenance very easy. Background Technology

[0004] Generally, the housing of a submersible pump is equipped with an impeller that rotates in connection with a drive shaft while having multiple blades, and as the drive shaft rotates, the impeller draws sludge into the center of the impeller, and the drawn-in sludge is conveyed by passing between the blades of the impeller, receiving speed and pressure, and exiting through the side space.

[0005] The impeller rotates by receiving rotational force through a drive shaft installed inside the pump housing, and is one of the core components of a centrifugal pump that generates pressure to suck in sludge and discharge the sucked-in sludge to the outside of the pump housing.

[0006] However, in the case of submersible pumps for sludge transport, pressure generated solely by the rotational force of the impeller is insufficient to smoothly transport highly concentrated sludge or sludge containing foreign substances.

[0007] Korean Utility Model No. 20-0441483 (Registration Date: August 13, 2008) provides a propeller-type rotating body by adding an auxiliary blade to the central part of the impeller, and also provides a cutting section on the side of the auxiliary blade to increase the suction power of the pump, while simultaneously,

[0008] It is characterized by cutting the sludge and transporting it even when highly concentrated sludge flows into the above pump.

[0009] However, if sludge of a relatively hard material that is not cut by the cutting part is introduced, the sludge cannot still be transported outside the pump housing, and there is a problem in that the cutting part may actually hinder the transport of the sludge.

[0010] As a conventional technology to improve these problems, Korean Registered Patent No. 10-0950454 (Registration Date: March 24, 2010) is disclosed, which is characterized by comprising: a suction port into which fluid is sucked; a suction pipe extending from the suction port and separated from the discharge pipe by a partition wall; a hollow portion connecting the suction pipe and the discharge pipe; an impeller that forcibly moves the fluid from the suction pipe to the discharge pipe through the hollow portion; a drive shaft that drives the impeller; a fixing screw; a discharge pipe; and a discharge port into which the fluid is discharged to the outside, and is composed of a sludge removal cover that completely covers a through portion formed by making a through portion of a casing at a position opposite to the impeller.

[0011] However, the above-mentioned conventional technology has limitations in that, due to the characteristics of having a separate sludge removal cover and the impeller always being fixed in place, if foreign substances contained in the incoming fluid collide with the impeller or get stuck between the impeller and the housing, the drive motor is overloaded and burnt out or the impeller blades are damaged. The problem to be solved

[0013] The present invention has been devised to solve the various problems of the prior art as described above.

[0014] By installing an impeller that rotates by being coupled to the shaft of a drive motor constituting a submersible pump, such that the impeller is raised and lowered by an impeller lifting means that is coupled to the shaft of the drive motor and adopts a special coupling structure,

[0015] By providing a submersible pump equipped with an impeller damage prevention device that enables the smoother discharge of various foreign substances through a buffering action in which the impeller is raised and lowered by an impeller lifting means adopting a special coupling structure when various foreign substances collide with the impeller during pumping operations or get stuck between the impeller and the casing while being transported, for a pump equipped for transporting thick debris such as sludge containing solids or waste in a sewage treatment plant or a manure treatment plant,

[0016] The purpose is to ensure that foreign substances are discharged smoothly during use, and to prevent damage to various parts such as impellers, shafts, and bearings, thereby minimizing motor failures and making maintenance very easy, so that the submersible pump of the present invention can be used safely for a long time.

[0018] In addition, the present invention is configured to allow an impeller to be raised and lowered by means of an impeller lifting means that adopts a special coupling structure to the shaft of a drive motor constituting a submersible pump and rotates, and at the same time,

[0019] By providing an impeller lifting type submersible pump that facilitates the discharge of foreign substances by further installing a special type of impeller damage prevention device between the lower surface of the impeller body constituting the above submersible pump and the upper surface of the suction cover coupled to the lower side of the impeller casing,

[0020] At the same time, various foreign substances can be smoothly discharged through the buffering action of the impeller being raised and lowered by the impeller lifting means,

[0021] Another objective is to ensure that various foreign substances are discharged more smoothly during use by simultaneously exhibiting a cushioning action as the above-mentioned special type of impeller damage prevention device moves up and down, thereby preventing damage to various parts such as the impeller, shaft, and bearing, and consequently preventing motor failure more efficiently, making maintenance easier. means of solving the problem

[0023] The purpose stated in the above-mentioned problem to be solved is,

[0024] Basically, a submersible pump comprising: a suction port for sucking in a fluid including sludge; an impeller that rotates to discharge the sludge and fluid introduced through the suction port to the outside; a shaft that transmits rotational power of a drive motor to the impeller; a discharge pipe that discharges the sludge and fluid to the outside according to the rotation of the impeller; and a casing that surrounds the impeller and forms the suction port and the discharge pipe.

[0025] An impeller that rotates by being coupled to the shaft of a drive motor constituting the above-mentioned submersible pump is installed so that the impeller is raised and lowered by an impeller lifting means comprising a spring on the shaft of the drive motor,

[0026] This is achieved by an impeller-raising / lowering type submersible pump that facilitates the discharge of foreign substances, characterized by the fact that when various foreign substances entering the impeller during pumping operations collide with the impeller equipped in the pump for transporting thick debris such as sludge containing solids or waste in a sewage treatment plant or a manure treatment plant, or when the foreign substances get stuck between the impeller and the casing while being transported, the impeller is raised and lowered by an impeller lifting means to act as a buffer, thereby allowing the various foreign substances to be discharged more smoothly.

[0028] In addition, the objective of the present invention is to install an impeller that rotates by being coupled to the shaft of a drive motor constituting the submersible pump so that the impeller is raised and lowered by an impeller lifting means comprising a spring on the shaft of the drive motor, and at the same time,

[0029] By further installing an impeller damage prevention device between the lower surface of the impeller body constituting the above submersible pump and the upper surface of the suction cover coupled to the lower side of the impeller casing,

[0030] By the cushioning action of the impeller moving up and down, various foreign substances are smoothly discharged, and at the same time, by the simultaneous manifestation of the cushioning action of the impeller damage prevention device moving up and down,

[0031] This is achieved by an impeller-raising / lowering type submersible pump that facilitates the discharge of foreign substances, characterized by the fact that various foreign substances are discharged more smoothly, and the effect of preventing damage to various parts such as impellers, shafts, and bearings is further enhanced. Effects of the invention

[0033] The impeller lifting / lowering type submersible pump according to the present invention, which facilitates the discharge of foreign substances, that is, a submersible pump installed so that the impeller is raised and lowered by an impeller lifting means,

[0034] When various foreign substances collide with the impeller equipped in a pump for transporting thick debris, such as sludge containing solids or waste, at a sewage treatment plant or manure treatment plant during pumping operations, or when the foreign substances get stuck between the impeller and the casing while being transported, the impeller is raised and lowered by an impeller lifting means, thereby providing a cushioning effect that allows the various foreign substances to be discharged more smoothly.

[0036] In addition, according to another embodiment of the present invention, an impeller lifting and lowering type submersible pump that facilitates the discharge of foreign substances is installed so that the impeller is raised and lowered by an impeller lifting means, and at the same time,

[0037] In the case of an impeller lifting type submersible pump that facilitates the discharge of foreign matter by further installing a special type of impeller damage prevention device between the lower surface of the impeller body constituting the above submersible pump and the upper surface of the suction cover coupled to the lower side of the impeller casing,

[0038] A buffering action in which the impeller is raised and lowered by an impeller lifting means, and

[0039] As the special type of impeller damage prevention device simultaneously performs a cushioning action that moves up and down, various foreign substances are discharged more smoothly, and damage to various parts such as the impeller, shaft, and bearing is prevented more perfectly, so motor failure is also prevented more efficiently.

[0040] Therefore, it is clear that the present invention is a highly groundbreaking invention that can be used with peace of mind for a long time because it is very easy to maintain. Brief explanation of the drawing

[0042] FIG. 1 is a diagram showing the configuration of an impeller-raising / lowering type submersible pump that facilitates the discharge of foreign substances according to one embodiment of the present invention. FIGS. 2a and 2b are drawings showing parts constituting an impeller lifting means, FIG. 2a is a perspective view of the separated state. FIG. 2b is a cross-sectional view of the separated state. FIGS. 3a and 3b are drawings showing the operating state of an impeller-raising / lowering submersible pump that facilitates the discharge of foreign substances according to an embodiment of the present invention, FIG. 3a is a drawing showing the state of the impeller before lifting. FIG. 3b is a drawing showing the state in which the impeller is raised by the impeller lifting means. FIGS. 4a and 4b illustrate another embodiment of the present invention in which an impeller damage prevention device using a single disk is additionally installed, FIG. 4a is a diagram showing the state before operation of the impeller damage prevention device using a single disk when the impeller is raised and lowered. FIG. 4b is a state in which the impeller is raised and lowered and the impeller damage prevention device using a single disk is also operated. FIGS. 5a and 5b illustrate another embodiment of the present invention in which an impeller damage prevention device using a set of two disks is additionally installed, FIG. 5a is a diagram showing the state before operation of an impeller damage prevention device using two sets of discs, with the impeller raised and lowered. FIG. 5b is a diagram showing the state in which the impeller is raised and lowered and the impeller damage prevention device using a set of two discs is operated. Specific details for implementing the invention

[0043] Hereinafter, embodiments of the present invention for achieving the purpose described in the problem to be solved above will be described in detail with reference to the attached drawings FIGS. 1 to 5b.

[0044] The embodiment described below is provided as an example to aid in understanding the present invention, and it should be understood that the present invention may be implemented with various modifications different from the embodiment described herein.

[0045] However, in describing the present invention, if it is determined that a detailed description of related known functions or components may unnecessarily obscure the essence of the invention, such detailed description and specific illustration are omitted.

[0046] Additionally, the attached drawings are not drawn to the actual scale to aid in understanding the invention, and the dimensions of some components may be exaggerated.

[0047] A submersible pump equipped with an impeller damage prevention device according to one embodiment of the present invention is, as illustrated in the attached drawings FIGS. 1 to 3b,

[0048] A submersible pump comprising: a suction port (31) for sucking in a fluid including sludge; an impeller (20) that rotates to discharge the sludge and fluid introduced through the suction port (31) to the outside; a shaft (11) that transmits rotational power of a drive motor (10) to the impeller (20); a discharge pipe (32) that discharges the sludge and fluid to the outside according to the rotation of the impeller (20); and a casing (30) that surrounds the impeller (20) and forms the suction port (31) and the discharge pipe (32).

[0049] An impeller (20) that rotates by being coupled to the shaft (11) of a drive motor (10) constituting the above-mentioned submersible pump is installed so that the impeller (20) is raised and lowered by an impeller lifting means (100) configured to include a spring (110) on the shaft (11) of the drive motor (10).

[0050] When various foreign substances entering the impeller (20) equipped in a pump for transporting thick debris such as sludge containing solids or waste in a sewage treatment plant or manure treatment plant collide with the impeller (20) during pumping operations or get stuck between the impeller (20) and the casing (30) while the foreign substances are being transported, the impeller (20) is raised and lowered by the impeller lifting means (100) to provide a cushioning action, thereby allowing the various foreign substances to be discharged more smoothly.

[0051] Here, the impeller lifting means (100) is,

[0052] An impeller boss coupling hole (22) is formed in the center of the shaft portion (21) of the body of the impeller (20).

[0053] A spring insertion chamber (22-1) of a predetermined diameter is formed on the lower side of this impeller boss coupling hole (22), and

[0054] An impeller sleeve insertion chamber (22-2) is formed above the spring insertion chamber (22-1),

[0055] A spring (110) is inserted and installed in a spring insertion chamber (22-1) of a predetermined diameter formed on the lower side of the inner surface of the impeller boss coupling hole (22).

[0056] After inserting and installing an impeller sleeve (120) in the above impeller sleeve insertion chamber (22-2) where the outer surface is circular and the inner surface is formed in a square shape,

[0057] A cylindrical impeller boss (130) is inserted such that the outer surface of the angular rotation interruption part (131) protruding outwardly at a predetermined position on the outer surface, the inner lower side of the angular groove (132) is formed, and the inner upper side of the shaft insertion hole (133) is formed, and the outer surface of the angular rotation interruption part (131) protruding outwardly at a predetermined position on the outer surface of the impeller boss (130) is closely and tightly coupled to the inner surface of the angular impeller sleeve (120).

[0058] After inserting the impeller cover (140), which has an impeller boss insertion hole (141) formed in the center, into the impeller boss (130) and seating it on the upper surface of the impeller shaft (21), fastening the fixing bolt (150) to prevent the impeller boss (130) from coming out, then

[0059] With the shaft portion (21) of the above impeller (20) passed through the shaft portion insertion hole (31) formed in the casing (30) and the shaft insertion hole (133) formed on the upper side inside the impeller boss (130) inserted into the shaft (11) of the drive motor (10).

[0060] By connecting a square space (160) having an outer surface that matches the square groove (132) through the square groove (132) formed on the inner lower side of the impeller boss (130) and fastening a wrench bolt (170), the impeller (20) is connected to the shaft (11) of the drive motor (10) through the impeller boss (130).

[0061] The impeller (20), which rotates by being coupled to the shaft (11) of the drive motor (10) constituting the above-mentioned submersible pump via an impeller boss (130), is installed so that it is raised and lowered by the elastic force of the spring (110) constituting the impeller lifting means (100).

[0062] The assembly order and method of each part for configuring the impeller lifting means (100) described above may be assembled by a worker in a different order and method, so it is not limited to only the order and method described above.

[0064] And, the present invention further forms an O-ring coupling groove (141a) on the inner surface of the impeller boss insertion hole (141) formed in the center of the impeller cover (140) and coupling an O-ring (145) thereto,

[0065] By sealing the outer surface of the impeller boss (130) and the inner surface of the impeller cover (140), it may be possible to prevent foreign substances from penetrating into the shaft portion (21) of the impeller (20).

[0067] In addition, the present invention involves connecting a square space (160) having an outer surface that matches the square groove (132) through a square groove (132) formed on the inner lower side of the impeller boss (130), and fastening a wrench bolt (170) to fix the impeller (20) to the shaft (11) of the drive motor (10) using the impeller boss (130) as a medium, and then

[0068] A sealing cap (180) is further attached to the entrance of the square groove (132) of the above impeller boss (130),

[0069] It may be configured so that foreign matter is prevented from getting stuck inside the square groove (132) and between the impeller (20) and the impeller boss (130).

[0071] Meanwhile, as another embodiment of the present invention as illustrated in the attached drawings FIGS. 4a to 5b,

[0072] An impeller (20) that rotates by being coupled to the shaft (11) of a drive motor (10) constituting the above-mentioned submersible pump is installed so that the impeller (20) is raised and lowered by an impeller lifting means (100) configured to include a spring (110) on the shaft (11) of the drive motor (10), and at the same time,

[0073] An impeller damage prevention device (200-1)(200-2) is further installed between the lower surface of the body of the impeller (20) constituting the above submersible pump and the upper surface of the suction cover (40) coupled to the lower side of the casing (30),

[0074] Various foreign substances are smoothly discharged through the cushioning action of the impeller (20) moving up and down, and at the same time, the impeller damage prevention device (200-1)(200-2) simultaneously exhibits a cushioning action of moving up and down,

[0075] Not only can various foreign substances be discharged more smoothly, but the effect of preventing damage to various parts such as the impeller (20), shaft (11), and bearing can also be further enhanced.

[0077] Here, in the case of the impeller damage prevention device (200-1), particularly as shown in the attached drawings FIG. 4a to 4b,

[0078] A single disc (210) having a hole (211) corresponding to the suction port (31) formed on the inner surface of the suction cover (40) is seated, and with the spring (213) installed, the threaded portion (214a) of the fixing bolt (214) is passed through the bolt insertion hole (40a) of the suction cover (40) and screwed into the threaded hole (210a) formed in the single disc (210).

[0079] The above single disk (210) can be configured to move up and down by the elastic force of the spring (213).

[0081] In addition, in the case of the above impeller damage prevention device (200-2), particularly as shown in the attached drawings FIGS. 5 to 5b,

[0082] A first disk (220) having a hole (221) formed corresponding to the suction port (31) of the suction cover (40) and a downwardly protruding rim (222) formed on its outer edge, and

[0083] It is configured separately with a second disk (230) which is coupled to the inner side of the edge (222) of the first disk (220) and has a hole (231) formed in the center corresponding to the suction port (31) of the casing (30).

[0084] With the spring (223) installed between the first disk (220) and the second disk (230), the threaded portion (224a) of the fixing bolt (224) is passed through the bolt insertion hole (230a) of the plate-shaped second disk (230) and screwed into the threaded hole (220a) formed in the first disk (220),

[0085] After placing the second disk (230) on the upper surface of the suction cover (40), it is fixedly installed using a fixing bolt (225),

[0086] The first disk (220) can be configured to move up and down by the elastic force of the spring (223).

[0087] The various discs used in the above-described impeller damage prevention device (200-1) (200-2) can be made of any one of rubber, synthetic resin, or metal, or a combination thereof, and are not limited to a specific material.

[0088] In addition, the spring used in the above impeller damage prevention device (200-1)(200-2) is a means for providing elastic force, so any elastic member other than a spring can be freely used regardless of material and shape.

[0090] First, regarding the present invention having the above configuration, the operating state of the submersible pump is described, wherein the impeller (20), which rotates by being coupled to the shaft (11) of the driving motor (10) constituting the submersible pump, is installed so that the impeller (20) is raised and lowered by an impeller lifting means (100) configured to include a spring (110) on the shaft (11) of the driving motor (10).

[0091] In particular, as illustrated in FIGS. 3a and 3b,

[0092] Basically, when the shaft (11) rotates due to the driving of the impeller (20) by the driving motor,

[0093] An impeller boss (130) fixedly installed on a shaft (11) with a square spacer (160) and a fixing bolt () rotates,

[0094] The reason is that the outer surface of the square space (160) is joined in close contact with the square groove (132) on the lower side of the impeller boss (130), so the rotational power of the shaft is fully transmitted from the square space (160) to the impeller boss (130).

[0095] When the impeller boss (130) rotates in this way, the impeller (20) then rotates.

[0096] The reason is that a square rotation interruption part (131) is formed at a predetermined position on the outer surface of the impeller boss (130), and the square outer surface of the square rotation interruption part (131) is joined so that the square inner surface of the impeller sleeve (120) installed in the impeller sleeve insertion chamber (22-2) of the impeller shaft part (21) is in close contact with the square outer surface of the impeller sleeve (120), so the signal is fully transmitted from the impeller boss (130) → square rotation interruption part (131) → impeller sleeve (120) → impeller (20).

[0097] According to the power transmission system described above, when the impeller (20) of the submersible pump rotates and performs pumping operations, if various foreign substances entering through the suction port (31) formed in the center of the casing (30) collide with the impeller (20) or get stuck between the impeller (20) and the casing (30) while the foreign substances are being transported, the impeller rises and falls as shown in the attached drawing Fig. 2b.

[0098] At this time, the reason the impeller (20) moves up and down is that when an upward pressure is applied from the lower side of the impeller (20), the impeller (20) attempts to move up and down, and a square rotation interruption part is formed at a predetermined position on the outer surface of the impeller boss (130), and the square outer surface of this square rotation interruption part (131) is joined so that the square inner surface of the impeller sleeve (120) installed on the impeller sleeve (120) of the impeller shaft part (21) is in close contact with it, so the rotational force is structurally interrupted, but it is possible for the impeller (20) to rise vertically.

[0099] In this way, as the impeller (20) moves up and down, the spring (110) is compressed, and then the impeller (20) descends due to the elastic force of the spring (110). Through this repeated cushioning action, solid materials are crushed, and materials that are not easily crushed, such as wet wipes and vinyl, are easily discharged through the gap between the bottom of the impeller (20) and the casing (30) or suction cover (40) as the impeller (20) moves up and down.

[0100] Therefore, in addition to this, damage to various parts such as the impeller (20), shaft (11), and bearing is prevented, so motor failure is prevented as much as possible.

[0102] Meanwhile, the present invention further forms an O-ring coupling groove (141a) on the inner surface of the impeller boss insertion hole (141) formed in the center of the impeller cover (140) and coupling an O-ring (145) thereto,

[0103] Since the outer surface of the impeller boss (130) and the inner surface of the impeller cover (140) are sealed, foreign matter is prevented from penetrating into the impeller shaft (21), and,

[0104] Since a sealing cap (180) is further attached to the entrance of the square groove (132) of the impeller boss (130), foreign matter is prevented from getting stuck inside the square groove (132) and between the impeller (20) and the impeller boss (130), thereby actively preventing damage to various parts.

[0106] In this instance, as another embodiment of the present invention as shown in FIGS. 4a to 5b, an impeller (20) that rotates by being coupled to the shaft (11) of a drive motor (10) constituting the submersible pump is installed so that the impeller (20) is raised and lowered by an impeller lifting means (100) configured to include a spring (110) on the shaft (11) of the drive motor (10), and simultaneously

[0107] A case in which an impeller damage prevention device (200-1)(200-2) is additionally installed between the lower surface of the body of the impeller (20) constituting the above-mentioned submersible pump and the upper surface of the suction cover (40) coupled to the lower side of the casing (30) is described (a detailed description of the operating state and effect of the impeller (20) being raised and lowered by the impeller lifting means (100) is omitted as it has been previously described).

[0108] First, in the case where an impeller damage prevention device (200-1) is additionally installed as shown in FIGS. 4a and 4b,

[0109] When various foreign substances entering through the suction port (31) of the casing (30) during pumping operation by the rotation of the impeller (20) provided in the submersible pump collide with the impeller (20) or get stuck between the impeller (20) and the plate-shaped disk (210) that is a single unit while the foreign substances are being transported,

[0110] Various foreign substances are smoothly discharged through the cushioning action of the impeller (20) being raised and lowered by the impeller lifting means (100), and at the same time,

[0111] The above impeller damage prevention device (200-1) simultaneously exhibits a cushioning effect as it moves up and down.

[0112] That is, as the single disk (210) constituting the impeller damage prevention device (200-1) installed on the inner surface of the suction cover (40) descends downward, the spring (213) is compressed, and subsequently, as the single disk (210) repeatedly moves up and down due to the elastic force of the spring (213), the solid material is crushed through the cushioning action that operates the single disk (210) up and down. In addition, as the single disk (210) descends, the gap between it and the bottom of the impeller (20) widens, so that the solid material is easily discharged through this gap.

[0113] Thus, the present invention is a cushioning action in which the impeller (20) is raised and lowered by the impeller lifting means (100) and a cushioning action in which the impeller damage prevention device (200-1) is raised and lowered simultaneously.

[0114] Since the gap is widened even more, various foreign substances are discharged more smoothly, and the effect of preventing damage to various parts such as the impeller (20), shaft (11), and bearing is further increased.

[0116] Meanwhile, particularly as illustrated in FIGS. 5a and 5b,

[0117] An impeller (20) that rotates by being coupled to the shaft (11) of a drive motor (10) constituting the above-mentioned submersible pump is installed so that the impeller (20) is raised and lowered by an impeller lifting means (100) configured to include a spring (110) on the shaft (11) of the drive motor (10), and at the same time,

[0118] In the case where an impeller damage prevention device (200-2) is further installed between the lower surface of the body of the impeller (20) constituting the above submersible pump and the upper surface of the suction cover (40) coupled to the lower side of the casing (30),

[0119] Various foreign substances are smoothly discharged through the cushioning action of the impeller (20) being raised and lowered by the impeller lifting means (100), and at the same time,

[0120] The above impeller damage prevention device (200-2) simultaneously exhibits a cushioning effect as it moves up and down.

[0121] That is, among the two sets of first discs (220) and second discs (230) having a spring (213) installed inside, the second disc (230) is fixedly installed with a fixing bolt (225) in a state where it is in close contact with the inner surface of the suction cover (40),

[0122] When various foreign substances entering through the suction port (31) of the casing (30) during the pumping operation by the rotation of the impeller (20) collide with the impeller (20) or get stuck between the impeller (20) and the first disc (220) while the foreign substances are being transported, the spring (223) is compressed as the first disc (220) descends, and then the first disc (220) repeatedly rises and falls due to the elastic force of the spring (223), thereby operating the first disc (220) up and down through a cushioning action that crushes solid materials, and as well as materials that are not easily crushed, the gap between the first disc (220) and the bottom of the impeller (20) widens as the first disc (220) descends, so they are easily discharged through this gap.

[0123] Thus, the present invention is a cushioning action in which the impeller (20) is raised and lowered by the impeller lifting means (100) and a cushioning action in which the impeller damage prevention device (200-2) is raised and lowered simultaneously.

[0124] Since the gap is widened even more, various foreign substances are discharged more smoothly, and the effect of preventing damage to various parts such as the impeller (20), shaft (11), and bearing is further increased.

[0125] In addition, in this configuration, the spring (223) is installed in a sealed state on the first disk (220) and the second disk (230), so foreign matter cannot penetrate between the two disks, thereby preventing damage to the spring (223) and ensuring very smooth operation.

[0126] Consequently, the present inventions according to the above-described embodiments not only allow various foreign substances to be discharged very smoothly, but also

[0127] It further prevents damage to various parts such as the impeller (20), shaft, and bearing, so that motor failure can be prevented as much as possible.

[0128] As described above, although the present invention has been explained by limited embodiments and drawings, it is not limited to these embodiments, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs. Explanation of the symbols

[0129] 10: Drive motor 20: Impeller 21: Impeller shaft 22: Impeller boss coupling hole 22-1: Spring insertion chamber 22-2: Impeller sleeve insertion chamber 30:Casing 31:Intake port 32: Discharge pipe 40: Suction cover 100: Impeller lifting means 110, 213, 223: Spring 120: Impeller Sleeve 130: Impeller Boss 131: Rectangular rotation interruption part 132: Rectangular groove 133: Shaft insertion hole 140: Impeller cover 141: Impeller boss insertion hole 141a: O-ring coupling groove 145: O-ring 150, 214: Fixing bolt 160: Rectangular space 170: Wrench bolt 180: Sealed cap 210: Single disc 211, 221: Impeller shaft insertion hole 222: Edge 220:1st Disk 230:2nd Disk

Claims

Claim 1 A submersible pump comprising: a suction port (31) for sucking in a fluid including sludge; an impeller (20) that rotates to discharge the sludge and fluid introduced through the suction port (31) to the outside; a shaft (11) that transmits rotational power of a drive motor (10) to the impeller (20); a discharge pipe (32) that discharges the sludge and fluid to the outside according to the rotation of the impeller (20); and a casing (30) that surrounds the impeller (20) and forms the suction port (31) and the discharge pipe (32), wherein the impeller (20), which rotates by being coupled to the shaft (11) of the drive motor (10) constituting the submersible pump, is installed so that the impeller (20) is raised and lowered by an impeller lifting means (100) configured to include a spring (110) on the shaft (11) of the drive motor (10), thereby in a sewage treatment plant or manure treatment plant In the event that various foreign substances entering the impeller (20) of a pump for transporting thick impurities such as sludge containing solids or waste materials collide during the pumping operation or get stuck between the impeller (20) and the casing (30) while being transported, the impeller (20) is raised and lowered by an impeller lifting means (100) to provide a cushioning action, thereby allowing the various foreign substances to be discharged more smoothly. The impeller lifting means (100) is formed such that an impeller boss coupling hole (22) is formed in the center of the shaft portion (21) of the body of the impeller (20), a spring insertion chamber (22-1) of a predetermined diameter is formed on the lower side of the impeller boss coupling hole (22), and an impeller sleeve insertion chamber (22-2) is formed on the upper side of the spring insertion chamber (22-1). A spring (110) is inserted and installed in a spring insertion chamber (22-1) of a predetermined diameter formed on the lower side of the inner surface of the impeller boss coupling hole (22), and an impeller sleeve (120) is inserted and installed in the impeller sleeve insertion chamber (22-2) in which the outer surface is circular and the inner surface is formed in a square shape, and then a square rotation interruption part (131) protruding outwardly is formed at a predetermined position on the outer surface.A cylindrical impeller boss (130) is inserted, having a square groove (132) formed on the inner lower side and a shaft insertion hole (133) formed on the inner upper side, and the square outer surface of the square rotation interruption part (131) protruding outwardly at a predetermined position on the outer surface of the impeller boss (130) is closely coupled to the square inner surface of the impeller sleeve (120). Then, an impeller cover (140) with an impeller boss insertion hole (141) formed in the center is inserted into the impeller boss (130) and seated on the upper surface of the impeller shaft part (21), and a fixing bolt (150) is fastened to prevent the impeller boss (130) from coming out. After that, the impeller (20) body shaft part (21) is passed through the shaft part insertion hole (31) formed in the casing (30) and formed on the inner upper side of the impeller boss (130). A submersible pump with an impeller that facilitates the discharge of foreign substances, characterized in that, with the shaft insertion hole (133) inserted into the shaft (11) of the drive motor (10), a square space (160) having an outer surface matching the square groove (132) is coupled through the square groove (132) formed on the inner lower side of the impeller boss (130) and a wrench bolt (170) is fastened so that the impeller (20) is coupled to the shaft (11) of the drive motor (10) via the impeller boss (130), thereby causing the impeller (20), which rotates and is coupled to the shaft (11) of the drive motor (10) constituting the submersible pump via the impeller boss (130), to move up and down by the elastic force of the spring (110). Claim 2 delete Claim 3 An impeller lifting / lowering type submersible pump with easy discharge of foreign matter, characterized in that, in claim 1, an O-ring coupling groove (141a) is further formed on the inner surface of the impeller boss insertion hole (141) formed in the center of the impeller cover (140) and an O-ring (145) is coupled thereto to seal the outer surface of the impeller boss (130) and the inner surface of the impeller cover (140), thereby preventing foreign matter from penetrating into the shaft portion (21) of the impeller (20). Claim 4 An impeller-raising / lowering type submersible pump with easy discharge of foreign matter, characterized in that, in claim 1, a square space (160) having an outer surface matching the square groove (132) is coupled through the square groove (132) formed on the inner lower side of the impeller boss (130), and a fixing bolt (150) is fastened to fix the impeller (20) to the shaft (11) of the drive motor (10) using the impeller boss (130) as a medium, and then a sealing cap (180) is further coupled to the inlet of the square groove (132) of the impeller boss (130) so as to prevent foreign matter from getting stuck inside the square groove (132) and between the impeller (20) and the impeller boss (130). Claim 5 In claim 1, an impeller (20) that rotates by being coupled to the shaft (11) of a drive motor (10) constituting the submersible pump is installed so that the impeller (20) is raised and lowered by an impeller lifting means (100) configured to include a spring (110) on the shaft (11) of the drive motor (10), and at the same time, an impeller damage prevention device (200-1) (200-2) is further installed between the lower surface of the body of the impeller (20) constituting the submersible pump and the upper surface of a suction cover (40) coupled to the lower side of the casing (30), so that various foreign substances are smoothly discharged through the cushioning action of the impeller (20) being raised and lowered, and at the same time, through the simultaneous manifestation of the cushioning action of the impeller damage prevention device (200-1) (200-2) being raised and lowered, various foreign substances are discharged even more smoothly, and the impeller (20), An impeller-raising / lowering type submersible pump that facilitates the discharge of foreign matter, characterized by being designed to further increase the effect of preventing damage to various parts including a shaft (11) and a bearing. Claim 6 In claim 5, the impeller damage prevention device (200-1) is characterized by a single disk (210) having a hole (211) corresponding to a suction port (31) formed on the inner surface of a suction cover (40), and a screw portion (214a) of a fixing bolt (214) is passed through a bolt insertion hole (40a) of the suction cover (40) and screwed into a screw hole (210a) formed in the single disk (210) while a spring (213) is installed, so that the single disk (210) is raised and lowered by the elastic force of the spring (213), thereby making it easy to discharge foreign matter, in an impeller raising and lowering type submersible pump. Claim 7 In claim 5, the impeller damage prevention device (200-2) is configured separately into a first disk (220) having a hole (221) corresponding to the suction port (31) of the suction cover (40) and a downwardly protruding rim (222) formed on its outer edge, and a second disk (230) coupled to the inner side of the rim (222) of the first disk (220) and having a hole (231) corresponding to the suction port (31) of the casing (30) formed in the center, wherein a spring (223) is installed between the first disk (220) and the second disk (230), and the threaded portion (224a) of the fixing bolt (224) is passed through the bolt insertion hole (230a) of the plate-shaped second disk (230) and screw-fastened into the threaded hole (220a) formed in the first disk (220), and then the An impeller-raising / lowering type submersible pump that facilitates the discharge of foreign matter, characterized in that the second disc (230) is placed on the upper surface of the suction cover (40) and then fixedly installed with a fixing bolt (225), so that the first disc (220) is raised and lowered by the elastic force of the spring (223).

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