JP2018178858A - Underwater pump and impeller for underwater pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underwater pump which, when obtaining different pump characteristics per impeller and maintaining a predefined pump characteristics by the impeller, can provide a desired pump characteristics without separately providing a new impeller.SOLUTION: An underwater pump 100 includes: a motor 1; a rotational shaft 2 which transmits drive force of the motor 1; a flat plate part 51 extending in a direction orthogonal to an axial direction of the rotational shaft 2; and an impeller 3 having a first impeller part 52 provided on one side surface 51a of the flat plate part 51 and a second impeller part 53 provided on the other side surface 51b of the flat plate part 51, in which, by switching positions of the first impeller part 52 and the second impeller part 53, a first arrangement and a second arrangement can be switched so as to attach to and detach from the rotational shaft 2. The first impeller part 52 is configured to function in the first arrangement, and the second impeller part 53 is configured to function in the second arrangement.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a submersible pump and an impeller for the submersible pump, and more particularly, to a submersible pump including an impeller mounted on a rotating shaft, and an impeller for a submersible pump mounted on the rotating shaft.

  Conventionally, a submersible pump provided with an impeller attached to a rotating shaft is known (for example, refer to patent documents 1).

  The above Patent Document 1 discloses a submersible pump including a motor, a rotating shaft, and an impeller attached to the rotating shaft. The impeller includes a flat-plate shaped shroud (plate-like portion) extending in a direction intersecting the axial direction of the rotation shaft, and a blade portion provided on one surface side of the shroud. The other surface of the shroud is a substantially flat surface.

JP, 2009-295547, A

  However, in the submersible pump of Patent Document 1, when it is desired to obtain different pump characteristics depending on the impeller, or when the driven power supply frequency changes or the pump is worn out, the impeller wants to maintain predetermined pump characteristics In this case, there is a problem that a new impeller must be separately prepared to replace the impeller. That is, since it is necessary to store new impellers in advance or to order them when new impellers are not at hand, it takes time and effort. In addition, when the power supply frequency changes (when the submersible pump is moved to a different power supply frequency area), the impeller must be replaced, for example, in the area of the power supply frequency 60 Hz specification in the power supply frequency 50 Hz If used, the performance of the pump will be insufficient, and if an impeller with a power supply frequency of 50 Hz is used in the area of the power supply frequency of 60 Hz, motor overload operation will occur.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to provide a new impeller in the case where it is desired to obtain different pump characteristics or to maintain predetermined pump characteristics. It is an object of the present invention to provide a submersible pump and a submersible pump impeller capable of obtaining desired pump characteristics without separately preparing.

  The submersible pump according to the first aspect of the present invention comprises a rotary drive unit, a rotary shaft for transmitting the driving force of the rotary drive unit, a flat plate-like portion extending in a direction intersecting with the axial direction of the rotary shaft, By replacing the arrangement of the first blade portion and the second blade portion, including a first blade portion disposed on one surface side of the portion and a second blade portion disposed on the other surface side of the plate-like portion And an impeller capable of switching between the first arrangement state and the second arrangement state to be attachable to and detachable from the rotation shaft, and configured to cause the first blade to function in the first arrangement state. In the second arrangement state, the second blade portion is configured to function.

  The submersible pump according to the first aspect of the present invention includes a first blade portion disposed on one surface side of the plate portion and a second blade portion disposed on the other surface side of the plate portion; In the first arrangement state, an impeller is provided which can be attached to and detached from the rotation shaft by switching between the first arrangement state and the second arrangement state by interchanging the arrangement of the blade portion and the second blade portion. The submersible pump is configured to function the vanes, and in the second arrangement state, the submersible pump is configured to function the second vanes. As a result, by switching the arrangement state of one impeller, it is possible to switch the blade portion functioning between the first blade portion and the second blade portion, so that the first blade portion and the second blade portion By giving different functions (shapes) to each other, desired pump characteristics can be obtained without separately preparing a new impeller when it is desired to obtain different pump characteristics. In addition, when it is desired to maintain a predetermined pump characteristic by making the first blade portion and the second blade portion the same shape (in order to prolong the life), or to exhibit the same pump characteristics at different power supply frequencies, etc. Desired pump characteristics can be obtained without separately preparing a new impeller. As described above, when it is desired to obtain different pump characteristics or to maintain predetermined pump characteristics, desired pump characteristics can be obtained without separately preparing a new impeller.

  In the submersible pump according to the first aspect, preferably, in the first arrangement state, the first blade part is made to function by storing water with the first blade part, and in the second arrangement state, The second blade portion is configured to function by discharging water with the second blade portion. According to this structure, water can be sent by the first blade portion in the first arrangement state, and water can be sent by the second blade portion in the second arrangement state. That is, by rotating the impeller in one direction in the first arrangement state, the first blade can be rotated in the forward direction, and the second blade can be rotated in the reverse direction. As a result, in the second arrangement state, water can be actively covered by the first blade portion, and water can be made less likely to be scraped by the second blade portion. In addition, in the second arrangement state, by rotating the impeller in one direction, the second blade can be rotated in the forward direction, and the first blade can be rotated in the reverse direction. As a result, in the second arrangement state, water can be actively covered by the second blade part, and it is possible to make it difficult for the first blade part to take water.

  The submersible pump according to the first aspect of the present invention preferably further includes a cover member that covers the second blade in the first arrangement state and covers the first blade in the second arrangement state. According to this structure, even if both the first and second blade portions are provided, the first and second blade portions and the second blade portion may be covered only by covering one of the first and second blade portions with the cover member. It is possible to make one of the blades not function substantially. Thereby, in the first arrangement state, it is possible to suppress the generation of the unnecessary flow without the second blade portion functioning, and therefore, it is possible to efficiently send the water by the first blade portion. Further, in the second arrangement state, since it is possible to suppress the generation of unnecessary flow without the first blade portion functioning, water can be efficiently sent by the second blade portion.

  In this case, preferably, the cover member includes a flat plate portion extending substantially parallel to the plate portion. According to this structure, the second blade portion can be sandwiched by the flat plate portion and the plate-like portion in the first arrangement state, and the first blade portion can be sandwiched in the second arrangement state. Then, the second blade can be made to not function effectively, and in the second arrangement state, the first blade can be made to not function effectively.

  In the configuration in which the cover member includes the flat portion, preferably, the cover member extends from the edge of the flat portion to the vicinity of the plate portion so as to surround one of the first blade and the second blade. Including. According to this structure, the second blade portion can be surrounded by the flat plate portion, the side wall portion and the plate-like portion in the first arrangement state, and the first blade portion can be surrounded in the second arrangement state. The second blade portion can be made to not function effectively in the one arrangement state, and the first blade portion can be made to not function effectively in the second arrangement state.

  In the submersible pump according to the first aspect, preferably, the first blade and the second blade are curved in opposite directions to each other in plan view. According to this structure, the second blade can be curved in the opposite direction to the first blade functioning in the first arrangement state, and the reverse direction to the second blade functioning in the second arrangement state Since the first blade portion can be curved, it is possible to easily switch to the second disposition state by reversing and attaching the impeller from the first disposition state, and reversing the impeller from the second disposition state The installation can be easily switched to the first arrangement state. In addition, it is possible to easily realize that it is difficult to scratch the water by rotating the first blade in the forward direction in the first arrangement state and to rotate the second blade in the reverse direction so as to make the water difficult to be scraped. Further, in the second arrangement state, it is possible to easily realize that the second blade portion is rotated in the forward direction to cover the water, and the first blade portion is rotated in the reverse direction to make the water difficult to be scraped.

  In the submersible pump according to the first aspect, preferably, the first blade and the second blade are configured to be used in response to different power supply frequencies. According to this structure, even when the submersible pump is used in an area where the power supply frequency is different, substantially the same pump characteristics can be obtained in both areas where the power supply frequency is different by switching the first blade and the second blade. it can.

  In the submersible pump according to the first aspect, preferably, the first blade portion in the first arrangement state and the second blade portion in the second arrangement state have shapes capable of exhibiting different pump characteristics from each other. . According to this configuration, the submersible pump switches between the first arrangement state and the second arrangement state according to the usage condition of the submersible pump, such as when the water contains a lot of foreign matter or when a high lift is required. Thus, desired pump characteristics can be exhibited.

  In the configuration including the cover member, preferably, in plan view, the first convex portion and the first convex portion extending in the axial direction of the rotation axis from the plate-like portion respectively at the centers of the first and second wing portions. Two convex portions are provided, and the first convex portion is configured to sandwich the cover member between itself and the rotation axis in the second arrangement state, and the second convex portion and the rotation axis in the first arrangement state. The cover member is configured to be sandwiched therebetween. According to this structure, the cover member can be easily fixed by pinching the rotary shaft and the impeller. Further, the cover member can be positioned and arranged at a predetermined position with respect to the blade portion by pinching the rotation shaft and the impeller.

  An impeller for a submersible pump according to a second aspect of the present invention includes a flat plate portion extending in a direction intersecting with the axial direction of a rotary shaft of the submersible pump, and a first plate disposed on one side of the plate portion. And a second blade portion disposed on the other surface side of the plate-like portion, wherein the first blade portion and the second blade portion are disposed in the first arrangement state and the second blade portion by exchanging their positions. In the first arrangement state, the first blade portion is configured to function, and in the second arrangement state, the second blade is configured to be able to switch between the arrangement state and to be detachable from the rotation shaft. The wings are configured to function.

  The submersible pump impeller according to the second aspect of the present invention includes a first blade portion disposed on one surface side of the plate portion and a second blade portion disposed on the other surface side of the plate portion. In the first arrangement state, there is provided an impeller which can be attached to and detached from the rotation shaft by switching the arrangement of the first and second blade portions by exchanging the arrangement of the first blade portion and the second blade portion. The submersible pump impeller is configured such that the first blade portion functions, and in the second arrangement state, the submersible pump impeller is configured such that the second blade portion functions. As a result, by switching the arrangement state of one impeller, it is possible to switch the blade portion functioning between the first blade portion and the second blade portion, so that the first blade portion and the second blade portion By giving different functions (shapes) to each other, desired pump characteristics can be obtained without separately preparing a new impeller when it is desired to obtain different pump characteristics. In addition, when it is desired to maintain a predetermined pump characteristic by making the first blade portion and the second blade portion the same shape (in order to prolong the life), or to exhibit the same pump characteristics at different power supply frequencies, etc. Desired pump characteristics can be obtained without separately preparing a new impeller. As described above, when it is desired to obtain different pump characteristics or to maintain predetermined pump characteristics, desired pump characteristics can be obtained without separately preparing a new impeller.

  According to the present invention, as described above, when it is desired to obtain different pump characteristics or maintain predetermined pump characteristics, it is possible to obtain desired pump characteristics without separately preparing a new impeller. Pumps and impellers for submersible pumps can be provided.

FIG. 1 is a schematic view showing a submersible pump and an impeller in a first arrangement according to a first embodiment of the present invention; It is the top view which showed the impeller of the submersible pump by 1st Embodiment of this invention. FIG. 2 is a schematic view of the submersible pump and the impeller in a second arrangement according to the first embodiment of the present invention; FIG. 6 is a schematic view showing a submersible pump and an impeller in a first arrangement according to a second embodiment of the present invention; FIG. 8 is a schematic view showing a submersible pump and an impeller in a first arrangement according to a third embodiment of the present invention; FIG. 8 is a schematic view of a submersible pump and an impeller in a second arrangement according to a third embodiment of the present invention;

  Hereinafter, embodiments of the present invention will be described based on the drawings.

First Embodiment
(Configuration of submersible pump)
A first embodiment of the present invention will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the submersible pump 100 according to the first embodiment includes a motor 1, a rotating shaft 2, a pump chamber 3, an oil chamber 4, and an impeller 5. The submersible pump 100 is a vertical submersible pump in which the rotation shaft 2 extends in the vertical direction (Z direction). The motor 1 is an example of the “rotational drive unit” in the claims.

  The motor 1 is sealed so that water from the outside does not enter. Further, the motor 1 is configured to rotationally drive an impeller 5 connected to the rotary shaft 2 via the rotary shaft 2. Specifically, the motor 1 includes a stator 11 and a rotor 12. The stator 11 is disposed on the outer side (peripheral side) of the rotor 12. The stator 11 has a coil (not shown). The stator 11 is configured to generate a magnetic field by being supplied with power from the cable C. The rotor 12 is attached to the rotation shaft 2 and disposed on the inner side (inner circumferential side) of the stator 11 so as to face the stator 11. That is, the motor 1 is an inner rotor motor. Further, the rotor 12 is configured to rotate with the rotating shaft 2 by the magnetic field from the stator 11. The rotor 12 is configured to rotationally drive the impeller 5 via the rotation shaft 2. Further, the motor 1 is configured to have a rotational speed corresponding to the power supply frequency.

  The rotating shaft 2 is configured to rotate by driving of the motor 1. The rotating shaft 2 is configured to transmit the driving force (torque) of the motor 1 to the impeller 5. The rotating shaft 2 is rotatably supported by bearings 21 and 22. The rotating shaft 2 is disposed to extend from the motor 1 to the pump chamber 3 through the oil chamber 4. Further, an impeller 5 is attached to an end (Z2 direction end) opposite to the end (Z1 direction end) of the rotary shaft 2 on the motor 1 side.

  At the lower end of the rotation shaft 2 (the end in the Z2 direction), a cylindrical step portion 2a whose outer shape is smaller than that of the upper portion of the rotation shaft 2 and extending downward (Z direction) is provided. The impeller 5 and a cover member 6 described later are attached to the outer peripheral surface of the step portion 2a by fitting. Further, at the lower end of the rotation shaft 2, a female screw portion 2 b extending upward is provided. The impeller 5 and the cover member 6 are configured to be fastened together to the rotating shaft 2 by a bolt B screwed from below to the female screw portion 2 b of the rotating shaft 2. The sum D1 of the sizes in the vertical direction (Z direction) of the impeller 5 and the cover member 6 is larger than the size D2 in the vertical direction of the stepped portion 2a.

  The pump chamber 3 includes a pump casing 31 and a suction cover 32 removably attached to the pump casing 31. The pump chamber 3 (pump casing 31) is disposed below the oil chamber 4. An impeller 5 is disposed inside the pump casing 31. A discharge port 31 a is provided on the side of the impeller 5 in the pump casing 31. The suction cover 32 is disposed below the impeller 5. The suction cover 32 is fixed to the pump casing 31 by bolts (not shown). Further, the suction cover 32 is provided with a water suction port 32a. Further, the suction port 32 a is disposed on the central axis line α of the rotation shaft 2.

  The impeller 5 rotates to suck water in a drainage area (not shown) such as a tank in which the submersible pump 100 is disposed from the suction port 32a into the pump casing 31, and discharges the sucked water to the discharge port 31a. It is configured to send in the direction of. Details of the impeller 5 will be described later.

  The oil chamber 4 is disposed between the motor 1 and the pump chamber 3. In detail, the oil chamber 4 is disposed on the lower side (Z2 direction side) of the motor 1 and on the upper side (Z1 direction side) of the pump casing 31. The oil chamber 4 includes a mechanical seal 41 and an oil lifter 42. The oil chamber 4 is filled with oil inside.

  The mechanical seal 41 has sliding portions (not shown) on the load side (the pump chamber 3 side, that is, the Z2 direction side) and the non-load side (the opposite side to the pump chamber 3, that is, the Z1 direction side). )have. The sliding portion on the load side has a function to prevent (suppress) the pressure water in the pump chamber 3 from flowing into the oil chamber 4. In addition, the sliding portion on the non-load side has a function of preventing (suppressing) the fluid containing the oil of the oil chamber 4 from flowing into the motor 1 side. The sliding portion is lubricated by the oil filled in the oil chamber 4 and is cooled so as not to burn. A seal (not shown) is provided between the bearing 22 and the anti-load side (upper end) of the mechanical seal 41. For example, an oil seal or the like is used as the seal.

  The oil lifter 42 is provided around the rotation shaft 2 of the oil chamber 4 and has a tubular shape surrounding the rotation shaft 2. Further, the oil lifter 42 is configured to lift the oil in the upward direction (Z1 direction) as the rotation shaft 2 rotates. That is, the oil lifter 42 is configured to supply the oil to the non-load side sliding portion of the mechanical seal 41. Further, a through hole 42 a is provided in the lower part of the oil lifter 42. The through hole 42 a is configured to guide the oil to the inner peripheral side of the oil lifter 42. The oil lifter 42 is configured to return the oil lifted upward (in the Z1 direction) from the upper end side of the oil lifter 42 to the outer peripheral side. Thus, the oil lifter 42 circulates the oil around the mechanical seal 41.

(Detailed configuration of the impeller)
Next, with reference to FIGS. 1 to 3, the detailed configuration of the impeller 5 will be described.

  The impeller 5 is connected to the motor 1 via the rotation shaft 2 as shown in FIG. Further, as described above, the impeller 5 is provided at the end of the rotary shaft 2 opposite to the motor 1 and is disposed in the pump chamber 3. Moreover, the impeller 5 is comprised so that speed energy may be provided to water by rotationally driving. In the pump chamber 3, pressure energy is applied to the water by converting velocity energy of the water into pressure energy, and the water is sent to the discharge port 31 a. The impeller 5 is configured to be rotated clockwise (see FIG. 2) by the motor 1 in plan view (as viewed from the Z1 direction).

  The impeller 5 includes a plate-like portion (shroud) 51, a first blade portion (blade) 52, and a second blade portion (blade) 53.

  Here, in the first embodiment, as shown in FIG. 1, the impeller 5 changes the arrangement of the first blade 52 and the second blade 53 so that the first arrangement state and the second arrangement state ( It is configured to be removable from the rotation shaft 2 by switching between the two. And the submersible pump 100 is comprised so that the 1st blade | wing part 52 may be functioned in a 1st arrangement | positioning state. The submersible pump 100 is configured to cause the second blade portion 53 to function in the second arrangement state.

  In detail, in the first arrangement state, the submersible pump 100 is configured to cause the first blade 52 to function by storing water with the first blade 52. That is, in the first arrangement state, the resistance of water applied to the first blade 52 is larger than the resistance of water applied to the second blade 53. On the other hand, in the second arrangement state, the submersible pump 100 is configured to make the second blade portion 53 function by storing water with the second blade portion 53. That is, in the second arrangement state, the resistance of water applied to the second blade portion 53 is larger than the resistance of water applied to the first blade portion 52.

  In the first arrangement state, as shown in FIG. 1, the first blade 52 is arranged closer to the suction port 32 a than the second blade 53. That is, the first arrangement state is a state in which the first blade 52 is arranged below the second blade 53 (in the Z2 direction). Further, in the first arrangement state, the first blade 52 and the suction port 32a are arranged to face each other in the vertical direction. In the second arrangement state, as shown in FIG. 3, the second blade portion 53 is arranged closer to the suction port 32 a than the first blade portion 52. That is, the second arrangement state is a state in which the second blade portion 53 is arranged below the first blade portion 52 (Z2 direction side). Further, in the second arrangement state, the second blade portion 53 and the suction port 32a are arranged to face each other in the vertical direction.

  The plate-like portion 51 has a circular flat plate shape as shown in FIG. The plate-like portion 51 extends in a direction (horizontal direction) intersecting with the axial direction (Z direction) of the rotation shaft 2. Further, the central axis of the plate-like portion 51 coincides with the central axis α of the rotation axis 2.

  As shown in FIG. 1, the first blade portion 52 is disposed on the side of one surface 51 a of the plate-like portion 51 (the surface on the lower side in the first arrangement state of FIG. 1). Further, a plurality of (four) first wing portions 52 are provided. In plan view (as viewed in the Z1 direction), the first blade 52 extends (projects) downward from the plate-like portion 51 (one surface 51a) in the axial direction of the rotary shaft 2 (Z2 direction). A convex portion 54 is provided. Further, as shown in FIG. 2, the first blade portion 52 has a counterclockwise direction (rotational direction of the impeller 5) about the central axis line α of the rotation axis 2 in plan view (viewed from the Z1 direction). It is curved to swell.

  The first blade 52 is a blade used at a power supply frequency of 60 Hz. That is, the first blade 52 is designed to exhibit predetermined pump characteristics when used at a power supply frequency of 60 Hz.

  As shown in FIG. 1, the second blade portion 53 is disposed on the other surface 51 b side of the plate-like portion 51 (the upper surface in the first arrangement state of FIG. 1). Further, a plurality of (four) second wing portions 53 are provided. In plan view (as viewed in the Z1 direction), the second wing 53 extends from the plate-like portion 51 (the other surface 51b) in the axial direction upward (Z1 direction) of the rotary shaft 2 (projects) Two convex portions 55 are provided. Further, the second blade portion 53 is curved so as to expand in the clockwise direction centering on the central axis line α of the rotation shaft 2 in plan view (viewed from the Z1 direction). That is, the first blade 52 and the second blade 53 are curved in opposite directions in plan view (as viewed from the Z1 direction). Therefore, in the impeller 5, one of the first blade 52 and the second blade 53 actively waters, and the other of the first blade 52 and the second blade 53 is water. It is configured to be difficult to scratch.

  The impeller 5 has a through hole communicating the end face of the first protrusion 54 in the axial direction (Z direction) of the rotation shaft 2 and the end face of the second protrusion 55 in the axial direction (Z direction) of the rotation shaft 2 56 are provided. The impeller 5 is fitted to the lower end portion (step portion 2 a) of the rotating shaft 2 through the through hole 56.

  The second blade 53 is a blade used at a power supply frequency of 50 Hz. That is, the second blade portion 53 is designed to exhibit predetermined pump characteristics when used at a power supply frequency of 50 Hz. In addition, the 2nd blade part 53 is comprised so that the pump characteristic substantially the same as the 1st blade part 52 used by the power supply frequency of 60 Hz may be exhibited.

  Here, the first blade portion 52 has a shape in which a part of the radially outer side (the opposite side to the rotation shaft 2 side) of the second blade portion 53 is removed. Specifically, the second blade portion 53 extends in the radial direction of the plate-like portion 51 from the edge 51 c of the plate-like portion 51 to the vicinity of the second convex portion 55 in the horizontal direction (direction orthogonal to the Z direction). It extends. On the other hand, in the horizontal direction, the radius of the plate-like portion 51 is from the position spaced apart by a predetermined distance inward from the edge 51 c of the plate-like portion 51 in the horizontal direction. It extends along the direction.

  Specifically, as shown in FIG. 2, assuming that the radius of the plate-like portion 51 is r, the outer end 52 a of the first blade portion 52 is (5/6) × r from the central axis line α of the rotation shaft 2 It is placed at a position spaced apart. Thereby, as shown in FIG. 1, the impeller 5 has the outermost portions of the first blade 52 and the second blade 53 (the outer end 52 a of the first blade 52 and the second blade 53). The speeds of the outer ends 53a) are configured to be approximately equal.

  As a result, in the impeller 5, the submersible pump 100 has substantially the same pump characteristics by the first blade 52 used at the power supply frequency of 60 Hz and the second blade 53 used at the power supply frequency of 50 Hz. It is configured to demonstrate. The position of the outer end 52a of the first blade 52 is determined by the ratio of the power supply frequency when the first blade 52 is used to the power supply frequency when the second blade 53 is used. Ru.

  Specifically, the power supply frequency when the first blade 52 is used is (F1) Hz, and the power supply frequency when the second blade 53 is used is smaller than (F1) Hz (F2) Hz If the radius of the plate-like portion 51 (the distance from the central axis line α of the rotary shaft 2 to the outer end 53a of the second blade 53) is r, then the outer end 52a of the first blade 52 is It is disposed at a position spaced apart from the central axis line α of the rotation shaft 2 by (F 2 / F 1) × r.

  The impeller 5 is provided with a cover member 6. The cover member 6 is configured to cover the second blade portion 53 in the first arrangement state shown in FIG. Further, the cover member 6 is configured to cover the first blade 52 in the second arrangement state shown in FIG. 3.

  As shown in FIG. 1, the cover member 6 includes a circular flat plate portion 61. The flat plate portion 61 extends substantially in parallel with the plate-like portion 51 of the impeller 5 (extends in the horizontal direction). Further, at the center of the flat plate portion 61, a through hole 62 which penetrates the flat plate portion 61 in the axial direction (Z direction) of the rotary shaft 2 is provided. The cover member 6 is fitted to the lower end portion (step portion 2 a) of the rotating shaft 2 through the through hole 62.

  The cover member 6 is attached to the rotating shaft 2 (step portion 2a) in a state of being sandwiched by the rotating shaft 2 and the impeller 5 in the vertical direction (Z direction). That is, the cover member 6 is nipped by the rotary shaft 2 and the impeller 5. For this reason, the cover member 6 is configured to rotate together with the rotation shaft 2 and the impeller 5. The second convex portion 55 is configured to sandwich the cover member 6 between itself and the rotation shaft 2 in the first arrangement state. Further, as shown in FIG. 3, the first convex portion 54 is configured to sandwich the cover member 6 with the rotation shaft 2 in the second arrangement state.

(Switching operation between the first arrangement state and the second arrangement state of the impeller)
Next, with reference to FIG. 1 and FIG. 3, the switching operation between the first arrangement state and the second arrangement state of the impeller 5 will be described. In the following, the switching operation of the impeller 5 in the first arrangement state to the second arrangement state will be described. The switching operation of the impeller 5 in the second arrangement state to the first arrangement state is the same as that of the first arrangement state, and therefore the description thereof is omitted.

  First, the bolt (not shown) for fixing the suction cover 32 to the pump casing 31 is removed, and the suction cover 32 is removed from the pump casing 31 to expose the impeller 5 so that it can be removed from below the submersible pump 100.

  Next, the bolt B is removed from the rotating shaft 2, and the impeller 5 fitted in the step portion 2 a of the rotating shaft 2 is removed from the rotating shaft 2.

  Next, the arrangement of the upper and lower portions of the first blade portion 52 and the second blade portion 53 is changed, and the impeller 5 is fitted to the stepped portion 2 a of the rotation shaft 2. That is, the impeller 5 is fitted to the stepped portion 2 a of the rotation shaft 2 in a state where the second blade portion 53 is disposed below the first blade portion 52. Then, the cover member 6 and the impeller 5 are fastened together to the rotation shaft 2 by the bolt B. Finally, the suction cover 32 is fixed to the pump casing 31 by bolts (not shown).

(Effect of the first embodiment)
In the first embodiment, the following effects can be obtained.

  In the first embodiment, as described above, it includes the first blade portion 52 disposed on one surface side of the plate-like portion 51 and the second blade portion 53 disposed on the other surface side of the plate-like portion 51. By replacing the arrangement of the first blade portion 52 and the second blade portion 53, the impeller 5 can be provided so as to be removable from the rotation shaft 2 by switching between the first arrangement state and the second arrangement state; In the first arrangement state, the submersible pump 100 is configured to function the first blade portion 52, and in the second arrangement state, the submersible pump 100 is configured to function the second blade portion 53. Thereby, by switching the arrangement state of one impeller 5, it is possible to switch the vanes functioning between the first vane 52 and the second vane 53, so that the first vane 52 and the second vane 52 can be used. By giving different functions (shapes) to the blade portion 53, desired pump characteristics can be obtained without separately preparing a new impeller 5 when it is desired to obtain different pump characteristics. In addition, when the first blade 52 and the second blade 53 have the same shape and want to maintain predetermined pump characteristics (if you want to extend the life), or if you want to exhibit the same pump characteristics at different power supply frequencies, etc. In addition, desired pump characteristics can be obtained without preparing a new impeller 5 separately. As described above, when it is desired to obtain different pump characteristics or to maintain predetermined pump characteristics, desired pump characteristics can be obtained without separately preparing a new impeller 5.

  In the first embodiment, as described above, in the first arrangement state, the submersible pump 100 is configured to cause the first blade 52 to function by storing water with the first blade 52, In the second arrangement state, the submersible pump 100 is configured to cause the second blade portion 53 to function by storing water by the second blade portion 53. Thereby, while being able to send water by the 1st blade part 52 in a 1st arrangement | positioning state, while being able to send water by the 2nd blade part 53 in a 2nd arrangement | positioning state. That is, in the first arrangement state, by rotating the impeller 5 in one direction, the first blade 52 can be rotated in the forward direction, and the second blade 53 can be rotated in the reverse direction. . As a result, in the second arrangement state, water can be actively covered by the first blade portion 52, and water can be made less likely to be scraped by the second blade portion 53. Further, in the second arrangement state, by rotating the impeller 5 in one direction, the second blade portion 53 can be rotated in the forward direction, and the first blade portion 52 can be rotated in the reverse direction. . As a result, in the second arrangement state, water can be actively covered by the second blade portion 53, and it is possible to make it difficult for the first blade portion 52 to scratch water.

  In the first embodiment, as described above, the cover member 6 is provided to cover the second blade 53 in the first arrangement state and to cover the first blade 52 in the second arrangement state. Thereby, only one of the first blade 52 and the second blade 53 can be covered by the cover member 6 so that one of the first blade 52 and the second blade 53 does not function substantially. Thereby, even if both of the first blade 52 and the second blade 53 are provided, it is possible to suppress the generation of unnecessary flow without the second blade 53 functioning in the first arrangement state. Water can be efficiently sent by the first blade 52. Further, in the second arrangement state, since it is possible to suppress the generation of unnecessary flow without the first blade 52 functioning, water can be efficiently sent by the second blade 53.

  In the first embodiment, as described above, the cover member 6 is provided with the flat plate portion 61 having a flat plate shape extending substantially in parallel with the plate portion 51. Thus, the second blade portion 53 can be sandwiched by the flat plate portion 61 and the plate-like portion 51 in the first arrangement state, and the first blade portion 52 can be sandwiched in the second arrangement state. Then, the second blade portion 53 can be made to not function effectively, and in the second arrangement state, the first blade portion 52 can be made to not function effectively.

  In the first embodiment, as described above, the first blade 52 and the second blade 53 are curved in opposite directions in plan view. Thus, the second blade 53 can be curved in the opposite direction to the first blade 52 functioning in the first arrangement state, and in the opposite direction to the second blade 53 functioning in the second arrangement state. Since the first blade portion 52 can be curved, it is possible to easily switch to the second arrangement state by reversing and attaching the impeller 5 from the first arrangement state, and reversing the impeller 5 from the second arrangement state It is possible to easily switch to the first arrangement state by attaching it. Further, in the first arrangement state, it is possible to easily realize that the first blade 52 is rotated in the forward direction to cover water, and the second blade 53 is rotated in the reverse direction to make it difficult to scrape water. . Further, in the second arrangement state, it is possible to easily realize that the second blade portion 53 is rotated in the forward direction to store the water, and the first blade portion 52 is rotated in the reverse direction to make the water difficult to be scraped. .

  Further, in the first embodiment, as described above, the first blade 52 and the second blade 53 are configured to be used in response to different power supply frequencies. Thereby, even when the submersible pump 100 is used in an area where the power supply frequency is different, substantially the same pump characteristics can be obtained in both areas where the power supply frequency is different by switching the first blade 52 and the second blade 53 .

  In the first embodiment, as described above, the first blade 52 extends in the axial direction of the rotation shaft 2 from the plate-like portion 51 at the center of the first blade 52 and the center of the second blade 53 in plan view. A first convex portion 54 and a second convex portion 55 are provided, and the first convex portion 54 is configured to sandwich the cover member 6 with the rotation shaft 2 in the second arrangement state, and the second convex portion 55 is In the first arrangement state, the cover member 6 is sandwiched between the rotary shaft 2 and the cover member 6. Thereby, the cover member 6 can be easily fixed by pinching of the rotating shaft 2 and the impeller 5. Further, the cover member 6 can be positioned and arranged at a predetermined position with respect to the blade portion by sandwiching the rotation shaft 2 and the impeller 5.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, unlike the first embodiment in which the cover member 6 is configured by the flat plate portion 61 disposed above the impeller 5 (in the Z1 direction), the cover member 6 a is disposed above the impeller 5. The example comprised with the flat part 61 arrange | positioned at and the side wall part 63 arrange | positioned at the side of the impeller 5 is demonstrated.

  As shown in FIG. 4, the submersible pump 200 according to the second embodiment includes a cover member 6 a.

  The cover member 6a includes a flat plate portion 61 and a side wall portion 63 extending from the edge portion 61a of the flat plate portion 61 to the vicinity of the plate portion 51 of the impeller 5 so as to surround the second blade portion 53 in the first arrangement state. It is. Therefore, the cover member 6a has a cylindrical shape whose upper side is closed and whose lower side is opened. Although not shown, the side wall 63 is configured to surround the first blade 52 in the second arrangement state. The lower end of the side wall portion 63 is disposed, for example, between the one surface 51 a of the plate-like portion 51 and the other surface 51 b in the height direction (Z direction).

  The remaining structure of the second embodiment is similar to that of the aforementioned first embodiment.

(Effect of the second embodiment)
In the second embodiment, the following effects can be obtained.

  In the second embodiment, as in the first embodiment, the first blade 52 disposed on one side of the plate 51 and the second blade disposed on the other side of the plate 51 And an impeller 5 capable of switching between the first arrangement state and the second arrangement state and replacing the arrangement of the first blade portion 52 and the second blade portion 53 so as to be detachable from the rotation shaft 2. In the first arrangement state, the submersible pump 200 is configured to function the first blade 52, and in the second arrangement state, the submersible pump 200 is configured to function the second blade 53. Thereby, when it is desired to obtain different pump characteristics or to maintain predetermined pump characteristics, desired pump characteristics can be obtained without separately preparing a new impeller 5.

  In the second embodiment, as described above, the edge 61 a of the flat plate 61 and the vicinity of the plate 51 are surrounded by the cover member 6 a so as to surround one of the first blade 52 and the second blade 53. A side wall 63 extending to the end is provided. Thereby, the second blade portion 53 can be surrounded by the flat plate portion 61, the side wall portion 63 and the plate-like portion 51 in the first arrangement state, and the first blade portion 52 can be surrounded in the second arrangement state. The second blade 53 can not function effectively in the first arrangement state, and the first blade 52 can not function effectively in the second arrangement state.

  The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

Third Embodiment
Next, a third embodiment of the present invention will be described with reference to FIGS. 5 and 6. In the third embodiment, unlike the first and second embodiments in which the submersible pump 100 is configured such that the impeller 5 exhibits substantially the same pump characteristics in the first arrangement state and the second arrangement state, An example will be described in which the submersible pump 300 is configured such that the impeller 5a exerts different pump characteristics in the first arrangement state and the second arrangement state. In the first and second embodiments, an example in which the submersible pump 100 is used at different power supply frequencies in the first arrangement state and the second arrangement state has been described, but in the third embodiment, the first arrangement state In the second arrangement state, an example of using the submersible pump 300 at the same power supply frequency will be described.

  As shown in FIG. 5 and FIG. 6, the submersible pump 300 according to the third embodiment includes an impeller 5 a.

  The impeller 5 a includes a plate-like portion 51, a first blade 52 and a second blade 53. In the first arrangement state, in a plan view (as viewed from the Z1 direction), at the center of the first blade 52, from the plate-like portion 51 (the other surface 51b) downward in the axial direction of the rotation shaft 2 (Z2 direction) An extending (projecting) first convex portion 54 a is provided. Further, in the first arrangement state, in plan view (as viewed from the Z1 direction), at the center of the second blade portion 53, the upper side (Z1 direction) of the plate-like portion 51 (the other surface 51b) ) (Projecting) is provided with a second convex portion 55a. In the second arrangement state shown in FIG. 6, the arrangement of the first protrusion 54a and the second protrusion 55a is upside down from the first arrangement state shown in FIG.

  As shown in FIG. 5, the first convex portion 54a has a height d1 in the height direction, and the second convex portion 55a has a height d2 in the height direction smaller than d1. (D1> d2). Therefore, the distance d3 from the first blade 52 to the suction cover 32 in the first arrangement state is larger than the distance d4 (see FIG. 6) from the second blade 53 to the suction cover 32 in the second arrangement state (d3) > D4).

  In the second arrangement state shown in FIG. 6, since the lower end of the second blade portion 53 is disposed in the vicinity of the suction cover 32, it is possible to apply relatively large pressure to the water by the impeller 5a, It is possible to exhibit the pump characteristic that a high lift is obtained. On the other hand, in the first arrangement state shown in FIG. 5, a higher lift is not obtained by the impeller 5a than in the second arrangement state, but a relatively large gap is secured between the first blade 52 and the suction cover 32. Foreign substances contained in the water can easily be passed through.

  The remaining structure of the third embodiment is similar to that of the aforementioned first and second embodiments.

(Effect of the third embodiment)
In the third embodiment, the following effects can be obtained.

  In the third embodiment, as in the first embodiment, the first blade 52 disposed on one side of the plate 51 and the second blade disposed on the other side of the plate 51 53, and the impeller 5a is switchable between the first arrangement state and the second arrangement state by exchanging the arrangement of the first blade 52 and the second blade 53, and can be attached to and removed from the rotation shaft 2 In the first arrangement state, the submersible pump 300 is configured to function the first blade portion 52, and in the second arrangement state, the submersible pump 300 is configured to function the second blade portion 53. Thereby, when it is desired to obtain different pump characteristics or to maintain predetermined pump characteristics, desired pump characteristics can be obtained without separately preparing a new impeller 5a.

  Further, in the third embodiment, as described above, the first blade portion 52 in the first arrangement state and the second blade portion 53 in the second arrangement state are formed in shapes that can exhibit mutually different pump characteristics. Thus, the submersible pump 300 switches between the first arrangement state and the second arrangement state according to the usage condition of the submersible pump 300 such as when the water contains a large amount of foreign matter or when a high lift is required. Desired pump characteristics can be exhibited.

  The remaining effects of the third embodiment are similar to those of the aforementioned first and second embodiments.

(Modification)
It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is indicated not by the description of the embodiments described above but by the claims, and further includes all modifications (modifications) within the meaning and scope equivalent to the claims.

  For example, in the first to third embodiments described above, an example is shown in which the shapes of the first blade portion and the second blade portion are different, but the present invention is not limited to this. In the present invention, the shapes of the first blade and the second blade may be the same. In this case, for example, when one blade is worn, the other non-worn blade can be switched and used.

  Moreover, although the example which comprised the 1st blade part and the 2nd blade part with four sheets was shown in said 1st-3rd embodiment, this invention is not limited to this. In the present invention, the first blade portion and the second blade portion may be configured by 1 to 3 sheets, or 5 sheets or more. Further, the number of first blades and the number of second blades may be different.

  In the first and second embodiments described above, the first blade used at a power supply frequency of 60 Hz is shaped by removing a part of the second blade used at a power supply frequency of 50 Hz. The present invention is not limited to this. In the present invention, the first blade may be smaller than the second blade and may be formed in a similar shape to the second blade.

  In the first and second embodiments, the first blade is an impeller used at a power supply frequency of 60 Hz, and the second blade is an impeller used at a power supply frequency of 50 Hz. The present invention is not limited to this. In the present invention, the first blade and the second blade may be used at power supply frequencies other than 60 Hz and 50 Hz, respectively. In this case, the power supply frequencies using the first blade and the second blade are different from each other.

  Moreover, although the example which provided the cover member in the submersible pump was shown in said 1st-3rd embodiment, this invention is not limited to this. In the present invention, the submersible pump may not be provided with the cover member.

  Moreover, although the example which utilized the motor as a rotation drive part of this invention was shown in said 1st-3rd embodiment, this invention is not limited to this. In the present invention, a configuration other than a motor such as an engine may be used as the rotational drive unit.

  In the first to third embodiments, the cover member is formed in a flat plate shape or a cylindrical shape with one end opened, but the present invention is not limited to this. In the present invention, the cover member may be formed in a shape other than a flat shape such as a rod shape, or a cylindrical shape in which one end is opened.

1 Motor (rotational drive)
DESCRIPTION OF SYMBOLS 2 Rotary shaft 5, 5a Impeller 6, 6a Cover member 51 Plate-like part 52 1st blade part 53 2nd blade part 54, 54a 1st convex part 55, 55a 2nd convex part 61 Flat part 61a edge part 63 Side wall part 100, 200 and 300 submersible pumps

Claims (10)

A rotary drive,
A rotary shaft that transmits the driving force of the rotary drive unit;
It is disposed on a flat plate-like portion extending in a direction intersecting the axial direction of the rotation shaft, a first blade portion disposed on one surface side of the plate-like portion, and the other surface side of the plate-like portion It is possible to switch between the first arrangement state and the second arrangement state to be detachable from the rotation shaft by including the second blade and replacing the arrangement of the first blade and the second blade. Equipped with an impeller,
The submersible pump according to claim 1, wherein the first blade is configured to function in the first arrangement state, and the second blade is configured to function in the second arrangement state.   In the first arrangement state, the first blade portion is configured to function by storing water by the first blade portion, and in the second arrangement state, the second blade portion stores water. The submersible pump according to claim 1, wherein the submersible unit is configured to cause the second blade to function.   The submersible pump according to claim 1, further comprising a cover member that covers the second blade portion in the first arrangement state, and covers the first blade portion in the second arrangement state.   The submersible pump according to claim 3, wherein the cover member includes a flat plate having a flat plate shape extending substantially in parallel with the plate portion.   The underwater according to claim 4, wherein the cover member includes a side wall portion extending from an edge portion of the flat plate portion to a vicinity of the plate portion so as to surround one of the first blade portion and the second blade portion. pump.   The submersible pump according to any one of claims 1 to 5, wherein the first blade portion and the second blade portion are curved in opposite directions in plan view.   The submersible pump according to any one of claims 1 to 6, wherein the first blade and the second blade are configured to be used at different power supply frequencies.   The said 1st blade part of the said 1st arrangement | positioning state, and the said 2nd blade part of the said 2nd arrangement | positioning state have a shape which can exhibit mutually different pump characteristics. Submersible pump according to claim 1. In plan view, first and second protrusions extending in the axial direction of the rotation shaft from the plate-like portion are provided at the center of the first blade and the center of the second blade, respectively.
The first convex portion is configured to sandwich the cover member between the first convex portion and the rotation shaft in the second arrangement state.
The submersible pump according to any one of claims 3 to 5, wherein the second convex portion is configured to sandwich the cover member with the rotation shaft in the first arrangement state. A flat plate portion extending in a direction intersecting with the axial direction of the rotary shaft of the submersible pump;
A first blade portion disposed on one surface side of the plate-like portion;
And a second blade portion disposed on the other surface side of the plate-like portion;
The first blade portion and the second blade portion are configured to be able to switch between the first arrangement state and the second arrangement state and be attachable to and detachable from the rotation shaft by exchanging the arrangement with each other. Yes,
In the first arrangement state, the first blade portion is configured to function,
In the second arrangement state, the submersible pump impeller configured to function the second blade portion.

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