Underwater pump

Abstract

The present invention provides an underwater pump which prevents excessive fastening of a fastening member with respect to a waterproof cover sealing a motor housing in a watertight manner, is easy to assemble by adjusting the fastening amount of a screw less or more, and has improved waterproofness. A waterproof cover (5) and a rear cover (6) are assembled on the axial opening end of the motor housing (3) on the side opposite to the pump housing (2) in a superposed manner, and a motor substrate (3m) electrically connected with a stator (3B) is accommodated in the internal space of the motor housing (3) closed by the waterproof cover (5) and the rear cover (6). A lead (3p) connected to the motor substrate (3m) is inserted through a tubular lead extraction opening (5f) formed integrally with the waterproof cover (5), penetrates through the rear cover (6), and is extracted to the outside of the motor case (3).

Description

Technical Field

[0001] The present disclosure relates to a submersible pump which is disposed in a water tank of a flush toilet and pumps water from the toilet bowl or is disposed in flooded water and drains water. Background Art

[0002] The housing of the pump body has an electric motor, an impeller driven to rotate thereby, and a water passage surrounding the impeller. The water sucked in from the suction port is pressed and discharged from the discharge port by the rotating impeller. The motor is covered by a waterproof cover made of rubber or vinyl chloride. The waterproof cover overlaps the flange portion relative to the housing of the pump body, and a plurality of screw threads are engaged to maintain a watertight state. In addition, a tubular portion through which a power supply line passes is extended in the waterproof cover, and a stainless steel fastening ring is embedded in the tubular portion, and the tubular portion is crimped to the electric wire to maintain a watertight state (Patent Document 1; Japanese Patent Utility Publication No. 51-14322). Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent Utility Model Publication No. 51-14322 Summary of the invention When the waterproof cover of the reference 1 is fastened to the housing of the pump body with screws, the operator needs to manage the tightening amount of the screws. If the screws are over-tightened, the rubber or resin waterproof cover is easily bent, and a gap caused by the bending may be generated, which may cause water infiltration. In addition, if the tightening amount of the screw is insufficient, it is possible that water will be more easily immersed than a gap is formed between the waterproof cover and the housing. The same is true for the metal fastening ring embedded in the tubular portion of the waterproof cover for taking out the wires.

[0005] The present invention is proposed to solve these technical problems, and its purpose is to provide a submersible pump, which prevents the fastening components from being over-tightened relative to the waterproof cover that seals the motor housing watertightly, is easy to assemble by adjusting the screw tightening amount neither too much nor too little, and has improved waterproofness.

[0006] In order to achieve the above object, the present invention includes the following structures. A submersible pump comprises: a pump part, the pump part having a suction port, a discharge port and an impeller, the suction port sucking stored water at the central part of the pump housing, the discharge port discharging the pressurized water flow at the outer peripheral part of the pump housing, the impeller pressurizing the stored water sucked into the pump housing from the suction port and discharging it from the discharge port; and a driving part, the driving part having a rotor and a stator, the rotor concentrically arranging the rotor magnetic poles around the rotor shaft, the rotor shaft being accommodated in a cylindrical motor housing assembled in the pump housing, the stator arranging the stator magnetic poles with the The rotor poles are arranged opposite to each other, and one end side of the rotor shaft accommodated in the motor housing is extended toward the pump housing side to become the rotating shaft of the impeller. It is characterized in that a waterproof cover and a rear cover are overlapped and assembled at the axial opening end of the motor housing on the opposite side of the pump housing, and a motor substrate electrically connected to the stator is accommodated in the internal space of the motor housing closed by the waterproof cover and the rear cover, and a tubular wire outlet for inserting wires connected to the motor substrate passes through the rear cover and is formed integrally with the waterproof cover. In this way, the waterproof cover and the rear cover are overlapped and assembled at the axial opening end of the cylindrical motor housing on the side opposite to the pump housing, so the waterproofness of the motor housing can be improved. The wire connected to the motor substrate is inserted through the tubular wire outlet formed integrally with the waterproof cover and passed through the rear cover to be taken out. The wire outlet is easily crimped with the wire and easily closed, so it is possible to prevent the waterproofness from being reduced due to excessive tightening of the fastening member of the waterproof cover.

[0007] Preferably, a waterproof casing covering the periphery of the rotor and separating the rotor from the stator is integrally assembled between the pump casing and the motor casing, and the stator and the motor substrate are accommodated in the cylindrical motor casing whose openings on both sides are closed by the waterproof casing and the waterproof cover. Thus, by arranging the rotor and the stator separately in the motor case by the waterproof case, the watertightness of the electric components housed in the cylindrical motor case whose openings on both sides are closed by the waterproof case and the waterproof cover can be improved.

[0008] Alternatively, the pump housing, the motor housing and the rear cover may be threadedly fixed at multiple locations in the circumferential direction, with the water-stop protrusion axially protruding at the open end of the waterproof cover being flattened at the open end of the opposite motor housing, and the cover protrusion protruding at the open end of the rear cover being axially abutted against the open end of the motor housing exposed from the waterproof cover. In this way, since the waterproof cover and the rear cover are assembled in an axially overlapping manner at the open end of the cylindrical motor housing, the waterproof property of the motor housing is improved by using the rear cover to flatten the waterproof cover's water-stopping protrusion and assembling. In particular, since the pump housing, the motor housing, and the rear cover are screwed at multiple locations in the circumferential direction in a state where the cover protrusion abuts against the axial open end of the motor housing exposed from the waterproof cover, there will be no deviation in the tightening amount due to the operator's over-tightening or under-tightening of the threads, and the assembly can be performed without deviation in the flattening amount of the water-stopping protrusion.

[0009] Alternatively, the first flange portion and the second flange portion are connected from the radial inside to the radial outside via a step at the open end of the motor housing, and a sealing portion is provided in the waterproof cover, wherein the sealing portion is formed by a water-stop protrusion pressed against the first flange portion and a sealing protrusion pressed against the second flange portion, which are connected via a circumferential groove. Thus, when the pump housing, the motor housing and the rear cover are threadedly fastened, the water-stop protrusion pressed against the first flange is flattened to fill the circumferential groove, and the sealing protrusion connected to the water-stop protrusion is pressed against the second flange connected to the first flange via a step. Therefore, the waterproofness of the motor housing can be improved by the deformation of the water-stop protrusion of the waterproof cover and the labyrinth structure of the sealing protrusion connected thereto.

[0010] Preferably, a plurality of through holes are perforated in the second flange portion of the motor housing, and enlarged through holes connected to the through holes and enlarged radially outward than each through hole are respectively provided in the sealing portion of the waterproof cover, and threaded holes connected to the through holes and the enlarged through holes are respectively provided in the fixing portion overlapping with the sealing portion in the rear cover, so that the enlarged through holes and the threaded holes are aligned with respect to the through holes of the motor housing, so that the sealing portion and the fixing portion overlap with the second flange portion, and the cover protrusions protruding from the fixing portion respectively abut against the second flange portion exposed from the enlarged through holes along the outer peripheral edge portion of the enlarged through holes. Therefore, when the pump housing, the motor housing and the rear cover are threadedly fastened, the cover protrusions protruding from the fixing portion are pressed against the second flange portion exposed from the enlarged through hole along the outer peripheral edge portion of the enlarged through hole, so that no deviation in the threaded fastening amount occurs, and the outer peripheral side of the cover protrusion can be surrounded by the sealing protrusion, thereby improving the waterproofness of the motor housing.

[0011] A submersible pump can be provided which prevents excessive tightening of a fastening member with respect to a waterproof cover that seals a motor housing watertightly, is easy to assemble by adjusting the screw tightening amount to be neither too much nor too little, and has improved waterproofness. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a top view of the submersible pump. Figure 2 yes Figure 1 Front view of the submersible pump. Figure 3 yes Figure 1 Right side view of the submersible pump. Figure 4 yes Figure 1 Rear view of the water pump. Figure 5 yes Figure 1 Perspective view of a water pump. Figure 6 is from Figure 5 Bottom view of the suction port of the submersible pump. Figure 7 yes Figure 2 A cross-sectional view of the submersible pump in the direction of arrow AA. Figure 8 yes Figure 2 Cross-sectional view of the submersible pump in the direction of arrow BB. Fig. 9 yes Figure 2 Cross-sectional view of the submersible pump in the direction of arrow CC. Fig.10 yes Figure 8 A partial enlarged cross-sectional view of a submersible pump. DETAILED DESCRIPTION

[0013] Hereinafter, an embodiment of the submersible pump of the present invention will be described with reference to the accompanying drawings. Figure 1 to Figure 6 The structure of the submersible pump 1 will be described. The submersible pump 1 is assembled into one piece by overlapping the motor housing 3 with the pump housing 2 via the waterproof housing 4 in the axial direction, overlapping the waterproof cover 5 and the rear cover 6 with the motor housing 3 in sequence, and threadingly engaging the sleeve bolts 7 provided at four locations along the circumferential direction.

[0014] A suction port 2a for sucking stored water is protrudingly provided at the center of the pump housing 2. In addition, a discharge port 2b for discharging pressurized water is provided at the outer periphery of the pump housing 2. In addition, an impeller 2c is rotatably accommodated in the pump housing 2 (pump unit; see Figure 6 When the impeller 2c rotates, the stored water is sucked into the pump housing 2 from the suction port 2a, and is pressurized by the impeller 2c and discharged from the discharge port 2.

[0015] exist Figure 8In the embodiment, a waterproof housing 4 is integrally assembled between the pump housing 2 and the motor housing 3, covering the rotor 3A and separating the rotor 3A from the stator 3B. The stator 3B is assembled in the motor housing 3 separated by the waterproof housing 4, and the motor substrate 3m electrically connected to the stator 3B is accommodated in the rear cover 6 assembled in the motor housing 3. Thus, by arranging the rotor 3A and the stator 3B separately by the waterproof case 4 in the motor case 3 , the watertightness of the electric components housed in the cylindrical motor case 3 whose openings on both sides are closed by the waterproof case 4 and the waterproof cover 5 can be improved.

[0016] The rotor 3A is accommodated in the waterproof case 4. The rotor 3A includes a rotor yoke 3e and a rotor magnet 3f (rotor magnetic pole) provided concentrically around a rotor shaft 3c via a bearing 3d. The rotor magnet 3f has N poles and S poles alternately formed in the circumferential direction. In addition, one end of the rotor shaft 3c is extended toward the pump housing 2 and serves as the rotation axis of the impeller 2c. The other end of the rotor shaft 3c is supported by a waterproof housing 4 inserted into the motor housing 3 in a nested manner. In this way, by using the waterproof housing 4 to separate the rotor 3A from the stator 3B in the motor housing 3, the watertightness of electrical components such as the stator 3B and the motor substrate 3m electrically connected to it through wiring can be improved. In addition, as Figure 8 As shown, the rotor yoke 3e and the impeller 2c may be formed integrally or assembled separately.

[0017] In addition, a cylindrical motor housing 3 is assembled in a waterproof housing 4 in an axially overlapping manner, and a stator 3B is assembled in the motor housing 3. Specifically, a core back 3h formed in an annular shape of a stator core 3g is bonded and fixed to the inner wall surface of the motor housing 3. A motor coil 3k is wound on a pole tooth (pole tooth portion) 3i extending radially inward from the core back 3h via an insulator 3j. The magnetic flux action surface of the pole tooth 3i is arranged opposite to the rotor magnet 3f via the waterproof housing 4 (see FIG. 2 ). Figure 7 ). In addition, the motor substrate 3m (driving unit; see Figure 8 ), the motor substrate is formed by an energizing circuit for energizing the motor coil 3k.

[0018] like Figure 8 As shown, a waterproof cover 5 and a rear cover 6 are assembled to overlap the axial opening end of the motor housing 3 on the side opposite to the pump housing 2. The motor substrate 3m electrically connected to the stator 3B is accommodated in the internal space of the motor housing 3 closed by the waterproof cover 5 and the rear cover 6. Fig. 9As shown, a tubular wire outlet 5f for inserting a wire 3p connected to the motor substrate 3m penetrates the rear cover 6 and is formed integrally with the waterproof cover 5. Since the wire outlet 5f penetrates the rear cover 6 and extends to the outside, the wire 3p connected to the motor substrate 3m is inserted through the wire outlet 5f and led out to the outside of the motor housing 3.

[0019] In this way, the waterproof cover 5 and the rear cover 6 are assembled to overlap the axial opening end of the cylindrical motor housing 3 on the side opposite to the pump housing 2, so that the waterproofness of the motor housing 3 can be improved. Since the wire 3p connected to the motor substrate 3m is inserted through the tubular wire outlet 5f formed integrally with the waterproof cover 5 and passed through the rear cover 6 to be taken out, the wire outlet 5f can be easily crimped to the wire 3p and easily closed using an adhesive or the like, and the reduction of waterproofness due to excessive tightening caused by the fastening member of the waterproof cover 5 can be prevented. As described above, since the watertightness of the space portion on the other axial end side of the motor is high, the electric system or wiring mechanism such as the motor substrate 3m can be installed without worrying about water immersion.

[0020] like Fig.10 As shown, at the opening end portion of the other axial end side of the motor housing 3, from the radial inner side to the radial outer side, the first flange portion 3b1 and the second flange portion 3b2 are connected in a step-like manner. The waterproof cover 5 is provided with a sealing portion 5a, which is formed by connecting the water stop protrusion 5c pressed against the first flange portion 3b1 and the sealing protrusion 5d pressed against the second flange portion 3b2 via a circumferential groove 5e. As a result, as Fig.10 As shown, when the pump housing 2, the motor housing 3 and the rear cover 6 are threadedly fastened, the water stop protrusion 5c pressed against the first flange portion 3b1 is flattened to fill the peripheral groove 5e, and the sealing protrusion 5d connected to the water stop protrusion 5c is pressed against the second flange portion 3b2 connected to the first flange portion 3b1 via a step. Therefore, the waterproofness of the motor housing 3 is improved by the deformation of the water stop protrusion 5c of the waterproof cover 5 and the labyrinth structure of the sealing protrusion 5d connected thereto.

[0021] like Figure 7 As shown, a plurality of through holes 3n (for example, four locations) are perforated along the circumferential direction in the second flange portion 3b2 of the motor housing 3. The sealing portion 5a of the waterproof cover 5 is provided with enlarged through holes 5b that are connected to the through holes 3n and are enlarged radially outward from each through hole 3n. Figure 8 As shown, in the rear cover 6, a screw hole 6b communicating with the through hole 3n and the enlarged through hole 5b is provided in a fixing portion 6a overlapping with the sealing portion 5a.

[0022] like Fig.10As shown, the enlarged through hole 5b and the threaded hole 6b are aligned with respect to the through hole 3n of the motor housing 3, and the waterproof cover 5 and the rear cover 6 are overlapped. At this time, the cover protrusion 6c protruding from the fixing portion 6a abuts against the second flange portion 3b2 exposed from the enlarged through hole 5b along the outer peripheral edge of the enlarged through hole 5b. An annular sealing protrusion 5d is provided on the radially outer side and radially inner side of the enlarged through hole 5b provided in the sealing portion 5a, and the sealing protrusion is embedded in the step portion 3b3 provided on the second flange portion 3b2.

[0023] Therefore, when the pump housing 2, the motor housing 3 and the rear cover 6 are threadedly fastened, the first flange portion 3b1 is pressed against the water-stop protrusion 5c, and the cover protrusion 6c protruding from the fixing portion 6a is pressed against the second flange portion 3b2 exposed from the enlarged through hole 5b along the outer peripheral edge portion of the enlarged through hole 5b. Therefore, no deviation in the threaded fastening amount will occur, and the outer peripheral side of the cover protrusion 6c can be surrounded by the sealing protrusion 5d, thereby improving the waterproofness of the motor housing 3.

[0024] like Figure 1 As shown, a threaded hole 6 b provided in the rear cover 6 is provided with a threaded groove into which a threaded portion 7 a provided at the front end portion of the sleeve bolt 7 is threadedly fitted. The waterproof cover 5 and the rear cover 6 are overlapped relative to the motor housing 3 in such a manner that the through hole 3n, the enlarged through hole 5b and the threaded hole 6a are aligned with each other. In the peripheral portion of the through hole 3n of the second flange portion 3b2, the outer peripheral side of the cover protrusion 6c is surrounded by the sealing protrusion 5d, and is respectively abutted against the second flange portion 3b2 exposed from the enlarged through hole 5b and is threadedly fixed to the sleeve bolt 7.

[0025] In this way, since the waterproof cover 5 and the back cover 6 are assembled in a manner that overlaps in the axial direction at the axial opening end of the motor housing 3, the waterproof property can be improved by flattening the waterproof cover 5 (water stop protrusion 5c) with the back cover 6 and assembling. In particular, in a state where the cover protrusion 6c is in contact with the axial opening end of the motor housing 3 exposed from the waterproof cover 5, the pump housing 2, the motor housing 3 and the back cover 6 are screwed and fixed at multiple locations in the circumferential direction, so there is no deviation in the amount of fastening caused by the operator's over-tightening or under-tightening, and the assembly can be performed without deviation in the amount of flattening of the water stop protrusion 5c. In addition, the waterproof property of the motor housing 3 is improved by the deformation of the water stop protrusion 5c of the waterproof cover 5 and the labyrinth structure of the sealing protrusion 5d connected thereto. In addition, the waterproof property of the motor housing 3 can also be improved by surrounding the outer peripheral side of the cover protrusion 6c pressed against the second flange portion 3b2 exposed from the enlarged through hole 5b with the sealing protrusion 5d.

[0026] The present invention provides a submersible pump 1 which is intended to be used in water such as a water storage tank of a flush toilet or a drainage pump, and has high reliability without impairing the waterproofness of a driving part.

Claims

1. A submersible pump, comprising: a pump unit having a suction port, a discharge port, and an impeller, wherein the suction port sucks stored water at a central portion of a pump housing, the discharge port discharges a pressurized water flow at an outer peripheral portion of the pump housing, and the impeller pressurizes the stored water sucked into the pump housing from the suction port and discharges it from the discharge port; and a driving unit, the driving unit comprising a rotor and a stator, the rotor concentrically arranging rotor poles around a rotor shaft, the rotor shaft being accommodated in a cylindrical motor housing assembled in the pump housing, the stator arranging stator poles and rotor poles opposite to each other, one end side of the rotor shaft accommodated in the motor housing extending toward the pump housing side to become a rotating axis of the impeller, characterized in that: A waterproof cover and a rear cover are overlapped and assembled at the axial opening end of the motor housing on the opposite side of the pump housing, and a motor substrate electrically connected to the stator is accommodated in the internal space of the motor housing closed by the waterproof cover and the rear cover. A tubular wire outlet for inserting wires connected to the motor substrate passes through the rear cover and is formed as a whole with the waterproof cover.

2. The submersible pump according to claim 1, characterized in that: A waterproof housing is integrally assembled between the pump housing and the motor housing to cover the rotor and separate the rotor from the stator. The stator and the motor substrate are accommodated in the cylindrical motor housing whose openings on both sides are closed by the waterproof housing and the waterproof cover.

3. The submersible pump according to claim 1 or 2, characterized in that: The pump housing, the motor housing and the rear cover are screwed at multiple locations in the circumferential direction while the water-stop protrusion protruding axially at the open end of the waterproof cover is flattened at the open end of the opposite motor housing, and the cover protrusion protruding at the open end of the rear cover is axially abutted against the open end of the motor housing exposed from the waterproof cover.

4. The submersible pump according to claim 1 or 2, characterized in that: The first flange portion and the second flange portion are connected from the radial inside to the radial outside via a step and are arranged at the open end of the motor housing. A sealing portion is arranged in the waterproof cover, and the sealing portion is formed by a water stopping protrusion pressed against the first flange portion and a sealing protrusion pressed against the second flange portion, which are connected via a circumferential groove.

5. The submersible pump according to claim 4, characterized in that: A plurality of through holes are perforated in the circumferential direction in the second flange portion of the motor housing, and enlarged through holes communicating with the through holes and expanding radially outwardly more than each through hole are respectively provided in the sealing portion of the waterproof cover, and threaded holes communicating with the through holes and the enlarged through holes are respectively provided in the fixing portion overlapping with the sealing portion in the rear cover, The waterproof cover portion and the rear cover are overlapped in such a manner that the enlarged through hole and the threaded hole are aligned relative to the through hole of the motor housing, and the cover protrusions protruding from the fixing portion abut against the second flange portion exposed from the enlarged through hole along the outer peripheral edge portion of the enlarged through hole.

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