JP6850184B2 - Submersible pumps and impellers for submersible pumps - Google Patents

Description

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

Conventionally, a submersible pump including an impeller attached to a rotating shaft is known (see, for example, Patent Document 1).

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-shaped portion) extending in a direction intersecting the axial direction of the rotating shaft, and a blade portion provided on one side of the shroud. The other surface of the shroud is a substantially flat surface.

Japanese Unexamined Patent Publication No. 2009-293547

However, in the submersible pump of Patent Document 1, when it is desired to obtain different pump characteristics depending on the impeller, and when the power frequency to be driven changes or the pump is worn, it is desired to maintain the predetermined pump characteristics by the impeller. In some cases, there is a problem that a new impeller must be prepared separately in order to replace the impeller. In other words, it is troublesome because it is necessary to store a new impeller in advance or to order a new impeller if it is not at hand. When the power frequency changes (when the submersible pump is moved to an area with a different power frequency), the impeller must be replaced, for example, when an impeller with a power frequency of 60 Hz is used in an area with a power frequency of 50 Hz. This is because if it is used, the performance of the pump will be insufficient, and if an impeller with a power frequency of 50 Hz is used in an area where the power frequency is 60 Hz, the motor will be overloaded.

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

The submersible pump according to the first aspect of the present invention has a rotary drive unit, a rotary shaft that transmits the driving force of the rotary drive unit, a flat plate-shaped plate-shaped portion that extends in a direction intersecting the axial direction of the rotary shaft, and a plate-like shape. By including the first blade portion arranged on one surface side of the portion and the second blade portion arranged on the other surface side of the plate-shaped portion, the arrangement of the first blade portion and the second blade portion is exchanged. , An impeller that can be attached to and detached from the rotating shaft by switching between the first arrangement state and the second arrangement state is provided, and in the first arrangement state, the first blade portion is configured to function. In the second arrangement state, the second blade portion is configured to function , and the impeller covers the second blade portion in the first arrangement state, covers the first blade portion in the second arrangement state, and impeller. A cover member that rotates with the cover member is provided .

The submersible pump according to the first aspect of the present invention includes a first blade portion arranged on one surface side of the plate-shaped portion and a second blade portion arranged on the other surface side of the plate-shaped portion. An impeller that can be attached to and detached from the rotating shaft by switching between the first arrangement state and the second arrangement state by exchanging the arrangement of the blade portion and the second arrangement state is provided, and in the first arrangement state, the first The submersible pump is configured to function the blades, and in the second arrangement state, the submersible pump is configured to function the second blades. As a result, by switching the arrangement state of one impeller, the blade portion that functions between the first blade portion and the second blade portion can be switched, so that the first blade portion and the second blade portion can be used. By having different functions (shapes) from each other, when it is desired to obtain different pump characteristics, it is possible to obtain desired pump characteristics without separately preparing a new impeller. Further, when the first blade portion and the second blade portion have the same shape and it is desired to maintain the predetermined pump characteristics (when the life is to be extended) or when the same pump characteristics are to be exhibited at different power supply frequencies. The 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 when it is desired to maintain the predetermined pump characteristics, the desired pump characteristics can be obtained without separately preparing a new impeller. Further, in the first arrangement state, the second blade portion does not function and it is possible to suppress the formation of an unnecessary flow, so that water can be efficiently sent to the first blade portion. Further, in the second arrangement state, the first blade portion does not function and it is possible to suppress the formation of an unnecessary flow, so that water can be efficiently sent to the second blade portion.

In the submersible pump according to the first aspect, preferably, in the first arrangement state, the first blade portion is configured to function by watering the first blade portion, and in the second arrangement state, the first blade portion is configured to function. The second blade portion is configured to function by watering the second blade portion. With this configuration, it is possible to send water by the first blade portion in the first arrangement state, and it is possible to send water by the second blade portion in the second arrangement state. That is, in the first arrangement state, by rotating the impeller in one direction, the first blade portion can be rotated in the forward direction and the second blade portion can be rotated in the opposite direction. As a result, in the second arrangement state, the first blade portion can be positively watered, and the second blade portion can make it difficult to water. Further, in the second arrangement state, by rotating the impeller in one direction, the second blade portion can be rotated in the forward direction and the first blade portion can be rotated in the opposite direction. As a result, in the second arrangement state, the second blade portion can positively water the water, and the first blade portion can make it difficult to water.

In the submersible pump according to the first aspect , preferably, the cover member includes a flat plate-shaped flat plate portion extending substantially parallel to the plate-shaped portion. With this configuration, the flat plate portion and the plate-shaped portion can sandwich the second blade portion in the first arrangement state, and can sandwich the first blade portion in the second arrangement state, so that the first arrangement state can be sandwiched. The second blade can be prevented from functioning effectively, and the first blade can be prevented from functioning effectively in the second arrangement state.

In a configuration in which the cover member includes a flat plate portion, the cover member preferably has a side wall portion extending from the edge portion of the flat plate portion to the vicinity of the plate-shaped portion so as to surround one of the first blade portion and the second blade portion. Including. With this configuration, the flat plate portion, the side wall portion, and the plate-shaped portion can surround the second blade portion in the first arrangement state, and can surround the first blade portion in the second arrangement state. In the one-arranged state, the second blade portion can be prevented from functioning effectively, and in the second arrangement state, the first blade portion can be prevented from functioning effectively.

In the submersible pump according to the first aspect, preferably, the first blade portion and the second blade portion are curved in opposite directions in a plan view. With this configuration, the second blade portion can be curved in the direction opposite to that of the first blade portion that functions in the first arrangement state, and the direction opposite to that of the second blade portion that functions in the second arrangement state. Since the first blade portion can be curved, the impeller can be easily switched to the second arrangement state by reversing the impeller from the first arrangement state, and the impeller is inverted from the second arrangement state. By attaching it, it is possible to easily switch to the first arrangement state. Further, in the first arrangement state, it is possible to easily realize that the first blade portion is rotated in the forward direction to draw water and the second blade portion is rotated in the reverse direction to make it difficult to draw water. Further, in the second arrangement state, it is possible to easily realize that the second blade portion is rotated in the forward direction to draw water and the first blade portion is rotated in the reverse direction to make it difficult to draw water.

In the submersible pump according to the first aspect, preferably, the first blade portion and the second blade portion are configured to be able to be used corresponding to different power supply frequencies. With this configuration, even when the submersible pump is used in areas with different power frequency, by switching between the first blade and the second blade, substantially the same pump characteristics can be obtained in both areas with different power frequencies. 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 pump characteristics different from each other. .. With this configuration, the submersible pump switches between the first arrangement state and the second arrangement state according to the usage situation of the submersible pump such as when the water contains a large amount of foreign matter or when a high lift is required. Therefore, the desired pump characteristics can be exhibited.

In the submersible pump according to the first aspect , preferably, in a plan view, the center of the first blade portion and the center of the second blade portion are each a first convex portion extending from the plate-shaped portion in the axial direction of the rotation axis. And a second convex portion is provided, the first convex portion is configured to sandwich the cover member with the rotating shaft in the second arrangement state, and the second convex portion is the rotation shaft in the first arrangement state. It is configured to sandwich the cover member between the two. With this configuration, the cover member can be easily fixed by sandwiching the rotating shaft and the impeller. Further, the cover member can be positioned and arranged at a predetermined position with respect to the blade portion by sandwiching the rotating shaft and the impeller.

The impeller for a submersible pump according to the second aspect of the present invention has a flat plate-shaped plate-shaped portion extending in a direction intersecting the axial direction of the rotation shaft of the submersible pump, and a first plate-shaped portion arranged on one surface side of the plate-shaped portion. The blade portion and the second blade portion arranged on the other side of the plate-shaped portion are provided, and the first blade portion and the second blade portion are arranged in the first arrangement state and the second by exchanging the arrangements with each other. It is configured so that it can be attached to and detached from the rotating shaft by switching between the arrangement state, the first blade portion is configured to function in the first arrangement state, and the second blade portion is in the second arrangement state. The blades are configured to function , covering the second blade in the first arrangement, covering the first blade in the second arrangement, and including the plate, first and second blades. A cover member that rotates with the impeller body is provided .

The impeller for a submersible pump according to the second aspect of the present invention includes a first blade portion arranged on one surface side of the plate-shaped portion and a second blade portion arranged on the other surface side of the plate-shaped portion. By exchanging the arrangement of the first blade portion and the second blade portion, an impeller that can be attached to and detached from the rotating shaft by switching between the first arrangement state and the second arrangement state is provided, and in the first arrangement state, , The submersible pump impeller is configured so that the first blade portion functions, and in the second arrangement state, the submersible pump impeller is configured so that the second blade portion functions. As a result, by switching the arrangement state of one impeller, the blade portion that functions between the first blade portion and the second blade portion can be switched, so that the first blade portion and the second blade portion can be used. By having different functions (shapes) from each other, when it is desired to obtain different pump characteristics, it is possible to obtain desired pump characteristics without separately preparing a new impeller. Further, when the first blade portion and the second blade portion have the same shape and it is desired to maintain the predetermined pump characteristics (when the life is to be extended) or when the same pump characteristics are to be exhibited at different power supply frequencies. The 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 when it is desired to maintain the predetermined pump characteristics, the desired pump characteristics can be obtained without separately preparing a new impeller. Further, in the first arrangement state, the second blade portion does not function and it is possible to suppress the formation of an unnecessary flow, so that water can be efficiently sent to the first blade portion. Further, in the second arrangement state, the first blade portion does not function and it is possible to suppress the formation of an unnecessary flow, so that water can be efficiently sent to the second blade portion.

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

It is the schematic which showed the submersible pump and the impeller in the 1st arrangement state by 1st Embodiment of this invention. It is a top view which showed the impeller of the submersible pump by 1st Embodiment of this invention. It is the schematic which showed the submersible pump and the impeller of the 2nd arrangement state by 1st Embodiment of this invention. It is the schematic which showed the submersible pump and the impeller in the 1st arrangement state by 2nd Embodiment of this invention. It is the schematic which showed the submersible pump and the impeller in the 1st arrangement state by 3rd Embodiment of this invention. It is the schematic which showed the submersible pump and the impeller of the 2nd arrangement state by 3rd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
(Submersible pump configuration)
The 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. Further, the submersible pump 100 is a vertical submersible pump in which the rotating shaft 2 extends in the vertical direction (Z direction). The motor 1 is an example of a "rotational drive unit" within the scope of claims.

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

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

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

The pump chamber 3 includes a pump casing 31 and a suction cover 32 that is detachably attached to the pump casing 31. The pump chamber 3 (pump casing 31) is arranged below the oil chamber 4. An impeller 5 is arranged inside the pump casing 31. The pump casing 31 is provided with a discharge port 31a on the side side of the impeller 5. The suction cover 32 is arranged below the impeller 5. Further, 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 32a is arranged on the central axis α of the rotating shaft 2.

By rotating the impeller 5, the water in the drainage region (not shown) such as the tank in which the submersible pump 100 is arranged is sucked into the pump casing 31 from the suction port 32a, and the sucked water is sucked into the pump casing 31a. It is configured to send in the direction of. The details of the impeller 5 will be described later.

The oil chamber 4 is arranged between the motor 1 and the pump chamber 3. Specifically, the oil chamber 4 is arranged on the lower side (Z2 direction side) of the motor 1 and 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 (pump chamber 3 side, that is, the Z2 direction side) and the counterload side (opposite side to the pump chamber 3, that is, the Z1 direction side), respectively. )have. The sliding portion on the load side has a function of preventing (suppressing) the pressure water of the pump chamber 3 from flowing into the oil chamber 4. Further, the sliding portion on the counterload side has a function of preventing (suppressing) the fluid containing oil in 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 cooled so as not to be seized. A seal (not shown) is provided above the counterload side (upper end) of the mechanical seal 41 and between the mechanical seal 41 and the bearing 22. As the seal, for example, an oil seal or the like is used.

The oil lifter 42 is provided around the rotating shaft 2 of the oil chamber 4, and has a tubular shape that surrounds the rotating shaft 2. Further, the oil lifter 42 is configured to lift the oil upward (Z1 direction) as the rotating shaft 2 rotates. That is, the oil lifter 42 is configured to supply oil to the sliding portion on the opposite load side of the mechanical seal 41. Further, a through hole 42a is provided in the lower portion of the oil lifter 42. The through hole 42a is configured to guide oil to the inner peripheral side of the oil lifter 42. Further, the oil lifter 42 is configured to return the oil lifted in the upward direction (Z1 direction) from the upper end side to the outer peripheral side of the oil lifter 42. In this way, the oil lifter 42 circulates oil around the mechanical seal 41.

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

As shown in FIG. 1, the impeller 5 is connected to the motor 1 via a rotating shaft 2. Further, as described above, the impeller 5 is provided at the end of the rotating shaft 2 opposite to the motor 1 side, and is arranged in the pump chamber 3. Further, the impeller 5 is configured to give velocity energy to water by rotationally driving the impeller 5. Then, in the pump chamber 3, pressure is applied to the water by converting the velocity energy of the water into pressure energy, and the water is sent to the discharge port 31a. The impeller 5 is configured to be rotated in the clockwise direction (see FIG. 2) by the motor 1 in a plan view (viewed from the Z1 direction).

The impeller 5 includes a plate-shaped 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 is in the first arrangement state and the second arrangement state by exchanging the arrangements of the first blade portion 52 and the second blade portion 53 (the first arrangement state and the second arrangement state ( It is configured so that it can be attached to and detached from the rotating shaft 2 by switching between (see FIG. 3). The submersible pump 100 is configured to function the first blade portion 52 in the first arrangement state. Further, the submersible pump 100 is configured to function the second blade portion 53 in the second arrangement state.

Specifically, the submersible pump 100 is configured to function the first blade portion 52 by watering the first blade portion 52 in the first arrangement state. That is, in the first arrangement state, the resistance of water applied to the first blade portion 52 is larger than the resistance of water applied to the second blade portion 53. On the other hand, in the second arrangement state, the submersible pump 100 is configured to function the second blade portion 53 by watering 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.

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

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

As shown in FIG. 1, the first blade portion 52 is arranged on one surface 51a side of the plate-shaped portion 51 (the lower surface in the first arrangement state of FIG. 1). Further, a plurality (4 pieces) of the first blade portions 52 are provided. In a plan view (when viewed from the Z1 direction), the center of the first blade portion 52 extends (projects) downward (protruding in the Z2 direction) from the plate-shaped portion 51 (one surface 51a) in the axial direction of the rotating shaft 2. One convex portion 54 is provided. Further, as shown in FIG. 2, the first blade portion 52 is in a counterclockwise direction (rotation direction of the impeller 5) about the central axis α of the rotation axis 2 in a plan view (viewed from the Z1 direction). It is curved so that it swells.

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

As shown in FIG. 1, the second blade portion 53 is arranged on the other surface 51b side of the plate-shaped portion 51 (the upper surface in the first arrangement state of FIG. 1). Further, a plurality (4 pieces) of the second blade portions 53 are provided. In a plan view (viewed from the Z1 direction), at the center of the second blade portion 53, a second (protruding) extension (protruding) from the plate-shaped portion 51 (the other surface 51b) in the axial direction of the rotating shaft 2. Two convex portions 55 are provided. Further, the second blade portion 53 is curved so as to bulge in the clockwise direction about the central axis α of the rotation axis 2 in a plan view (when viewed from the Z1 direction). That is, the first blade portion 52 and the second blade portion 53 are curved in opposite directions in a plan view (when viewed from the Z1 direction). Therefore, in the impeller 5, one of the first blade portion 52 and the second blade portion 53 actively waters the impeller 5, and at the same time, the other of the first blade portion 52 and the second blade portion 53 draws water. It is configured to be difficult to scratch.

The impeller 5 has a through hole that communicates the end surface of the first convex portion 54 in the axial direction (Z direction) of the rotating shaft 2 and the end surface of the second convex portion 55 in the axial direction (Z direction) of the rotating shaft 2. 56 is provided. The impeller 5 is fitted to the lower end portion (step portion 2a) of the rotating shaft 2 through the through hole 56.

The second blade portion 53 is a blade portion used at a power supply frequency of 50 Hz. That is, the second blade portion 53 is designed to exhibit a predetermined pump characteristic when used at a power supply frequency of 50 Hz. The second blade portion 53 is configured to exhibit substantially the same pump characteristics as the first blade portion 52 used at a power supply frequency of 60 Hz.

Here, the first blade portion 52 has a shape obtained by removing a part of the second blade portion 53 on the outer side in the radial direction (the side opposite to the rotation shaft 2 side). Specifically, the second blade portion 53 extends along the radial direction of the plate-shaped portion 51 from the edge portion 51c of the plate-shaped portion 51 to the vicinity of the second convex portion 55 in the horizontal direction (direction orthogonal to the Z direction). Is extending. On the other hand, in the horizontal direction, the first blade portion 52 has a radius of the plate-shaped portion 51 from a position separated by a predetermined distance from the radial outer edge portion 51c of the plate-shaped portion 51 to the vicinity of the first convex portion 54. It extends along the direction.

Specifically, as shown in FIG. 2, assuming that the radius of the plate-shaped portion 51 is r, the outer end portion 52a of the first blade portion 52 is (5/6) × r from the central axis α of the rotating shaft 2. It is arranged at a position separated by only. As a result, as shown in FIG. 1, the impeller 5 has the outermost outermost portions of the first blade portion 52 and the second blade portion 53 (outer end portions 52a of the first blade portion 52 and the second blade portion 53). The speeds of the outer end 53a) are configured to be substantially equal.

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

Specifically, the power frequency when the first blade 52 is used is (F1) Hz, and the power frequency when the second blade 53 is used is (F2) Hz, which is smaller than (F1) Hz. If the radius of the plate-shaped portion 51 (the distance from the central axis α of the rotating shaft 2 to the outer end portion 53a of the second blade portion 53) is r, the outer end portion 52a of the first blade portion 52 is , It is arranged at a position separated from the central axis α of the rotating shaft 2 by (F2 / F1) × 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 portion 52 in the second arrangement state shown in FIG.

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

The cover member 6 is attached to the rotating shaft 2 (step portion 2a) in a vertical direction (Z direction) in a state of being sandwiched between the rotating shaft 2 and the impeller 5. That is, the cover member 6 is sandwiched between the rotating shaft 2 and the impeller 5. Therefore, the cover member 6 is configured to rotate together with the rotating shaft 2 and the impeller 5. The second convex portion 55 is configured to sandwich the cover member 6 with the rotating 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 rotating shaft 2 in the second arrangement state.

(Switching operation between the first arrangement state and the second arrangement state of the impeller)
Next, the operation of switching between the first arrangement state and the second arrangement state of the impeller 5 will be described with reference to FIGS. 1 and 3. In the following, the operation of switching the impeller 5 in the first arrangement state to the second arrangement state will be described. Since the operation of switching the impeller 5 in the second arrangement state to the first arrangement state is the same, the description thereof will be 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 taken out from below the submersible pump 100.

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

Next, the upper and lower arrangements of the first blade portion 52 and the second blade portion 53 are exchanged, and the impeller 5 is fitted into the stepped portion 2a of the rotating shaft 2. That is, with the second blade portion 53 arranged below the first blade portion 52, the impeller 5 is fitted into the stepped portion 2a of the rotating shaft 2. Then, the cover member 6 and the impeller 5 are fastened together with the rotating shaft 2 by the bolt B. Finally, the suction cover 32 is fixed to the pump casing 31 with 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, the first blade portion 52 arranged on one surface side of the plate-shaped portion 51 and the second blade portion 53 arranged on the other surface side of the plate-shaped portion 51 are included. By swapping the arrangements of the first blade portion 52 and the second blade portion 53, an impeller 5 that can be attached to and detached from the rotating shaft 2 by switching between the first arrangement state and the second arrangement state is provided. In the one-arranged state, the submersible pump 100 is configured so that the first blade portion 52 functions, and in the second arrangement state, the submersible pump 100 is configured so that the second blade portion 53 functions. As a result, by switching the arrangement state of one impeller 5, the blade portion that functions between the first blade portion 52 and the second blade portion 53 can be switched, so that the first blade portion 52 and the second blade portion 52 can be switched. By providing the blades 53 with different functions (shapes), it is possible to obtain desired pump characteristics without separately preparing a new impeller 5 when it is desired to obtain different pump characteristics. Further, when the first blade portion 52 and the second blade portion 53 have the same shape and it is desired to maintain a predetermined pump characteristic (when it is desired to extend the life), or when it is desired to exhibit the same pump characteristic at different power supply frequencies. In addition, desired pump characteristics can be obtained without separately preparing a new impeller 5. As described above, when it is desired to obtain different pump characteristics or when it is desired to maintain the predetermined pump characteristics, the desired pump characteristics can be obtained without separately preparing a new impeller 5.

Further, in the first embodiment, as described above, in the first arrangement state, the submersible pump 100 is configured so that the first blade portion 52 functions by watering the first blade portion 52. In the two-arranged state, the submersible pump 100 is configured so that the second blade portion 53 functions by watering the second blade portion 53. As a result, water can be sent by the first blade portion 52 in the first arrangement state, and water can be sent by the second blade portion 53 in the second arrangement state. That is, in the first arrangement state, by rotating the impeller 5 in one direction, the first blade portion 52 can be rotated in the forward direction, and the second blade portion 53 can be rotated in the opposite direction. .. As a result, in the second arrangement state, the first blade portion 52 can positively water the water, and the second blade portion 53 can make it difficult to water. 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 opposite direction. .. As a result, in the second arrangement state, the second blade portion 53 can positively water the water, and the first blade portion 52 can make it difficult to water.

Further, in the first embodiment, as described above, the cover member 6 that covers the second blade portion 53 in the first arrangement state and covers the first blade portion 52 in the second arrangement state is provided. As a result, it is possible to cover only one of the first blade portion 52 and the second blade portion 53 with the cover member 6 so that one of the first blade portion 52 and the second blade portion 53 does not function substantially. As a result, even if both the first blade portion 52 and the second blade portion 53 are provided, it is possible to prevent the second blade portion 53 from not functioning and creating an unnecessary flow in the first arrangement state. , Water can be efficiently sent by the first blade portion 52. Further, in the second arrangement state, the first blade portion 52 does not function and it is possible to suppress the formation of an unnecessary flow, so that water can be efficiently sent to the second blade portion 53.

Further, in the first embodiment, as described above, the cover member 6 is provided with a flat plate-shaped flat plate portion 61 extending substantially parallel to the plate-shaped portion 51. As a result, the flat plate portion 61 and the plate-shaped portion 51 can sandwich the second blade portion 53 in the first arrangement state and the first blade portion 52 in the second arrangement state, so that the first arrangement state can be sandwiched. The second blade portion 53 can be prevented from functioning effectively, and the first blade portion 52 can be prevented from functioning effectively in the second arrangement state.

Further, in the first embodiment, as described above, the first blade portion 52 and the second blade portion 53 are curved in opposite directions in a plan view. As a result, the second blade portion 53 can be curved in the direction opposite to that of the first blade portion 52 functioning in the first arrangement state, and in the direction opposite to that of the second blade portion 53 functioning in the second arrangement state. Since the first blade portion 52 can be curved, the impeller 5 can be easily switched to the second arrangement state by reversing the impeller 5 from the first arrangement state, and the impeller 5 is inverted 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 portion 52 is rotated in the forward direction to draw water and the second blade portion 53 is rotated in the reverse direction to make it difficult to draw 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 draw water and the first blade portion 52 is rotated in the reverse direction to make it difficult to draw water. ..

Further, in the first embodiment, as described above, the first blade portion 52 and the second blade portion 53 are configured so that they can be used corresponding to different power supply frequencies. As a result, even when the submersible pump 100 is used in areas where the power supply frequencies are different, substantially the same pump characteristics can be obtained in both areas where the power supply frequencies are different by switching the first blade portion 52 and the second blade portion 53. ..

Further, in the first embodiment, as described above, in a plan view, the second blade portion 52 extends from the plate-shaped portion 51 to the center of the second blade portion 53 in the axial direction of the rotation shaft 2, respectively. The first convex portion 54 and the second convex portion 55 are provided, and the first convex portion 54 is configured to sandwich the cover member 6 with the rotating shaft 2 in the second arrangement state, and the second convex portion 55 is formed. In the first arrangement state, the cover member 6 is sandwiched between the rotating shaft 2 and the rotating shaft 2. As a result, the cover member 6 can be easily fixed by sandwiching 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 rotating 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 composed of the flat plate portion 61 arranged above the impeller 5 (Z1 direction), the cover member 6a is above the impeller 5. An example of the flat plate portion 61 arranged on the side of the impeller 5 and the side wall portion 63 arranged on the side of the impeller 5 will be described.

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

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-shaped portion 51 of the impeller 5 so as to surround the second blade portion 53 in the first arrangement state. I'm out. Therefore, the cover member 6a has a tubular shape in which the upper side is closed and the lower side is open. Although not shown, the side wall portion 63 is configured to surround the first blade portion 52 in the second arrangement state. The lower end of the side wall portion 63 is arranged between one surface 51a and the other surface 51b of the plate-shaped portion 51 in the height direction (Z direction), for example.

The other configurations of the second embodiment are the same as those of the first embodiment.

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

In the second embodiment, similarly to the first embodiment, the first blade portion 52 arranged on one surface side of the plate-shaped portion 51 and the second blade portion arranged on the other surface side of the plate-shaped portion 51. An impeller 5 that includes 53 and can be attached to and detached from the rotating shaft 2 by switching the arrangement of the first blade portion 52 and the second blade portion 53 to switch between the first arrangement state and the second arrangement state. In the first arrangement state, the submersible pump 200 is configured to function the first blade portion 52, and in the second arrangement state, the submersible pump 200 is configured to function the second blade portion 53. Thereby, when it is desired to obtain different pump characteristics or when it is desired to maintain the predetermined pump characteristics, the desired pump characteristics can be obtained without separately preparing a new impeller 5.

Further, in the second embodiment, as described above, the cover member 6a surrounds one of the first blade portion 52 and the second blade portion 53 from the edge portion 61a of the flat plate portion 61 to the vicinity of the plate-shaped portion 51. A side wall portion 63 extending to is provided. As a result, the flat plate portion 61, the side wall portion 63, and the plate-shaped portion 51 can surround the second blade portion 53 in the first arrangement state, and can surround the first blade portion 52 in the second arrangement state. In the first arrangement state, the second blade portion 53 can be prevented from functioning effectively, and in the second arrangement state, the first blade portion 52 can be prevented from functioning effectively.

The other effects of the second embodiment are the same as those of the 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 so that the impeller 5 exhibits substantially the same pump characteristics in the first arrangement state and the second arrangement state, the first embodiment An example in which the submersible pump 300 is configured so that the impeller 5a exhibits different pump characteristics in the first arrangement state and the second arrangement state will be described. In the first and second embodiments, an example in which the submersible pump 100 is used at different power supply frequencies in the first and second arrangement states has been described, but in the third embodiment, the first arrangement state has been described. An example in which the submersible pump 300 is used at the same power frequency as each other in the second arrangement state and the second arrangement state will be described.

As shown in FIGS. 5 and 6, the submersible pump 300 of the third embodiment includes an impeller 5a.

The impeller 5a includes a plate-shaped portion 51, a first blade portion 52, and a second blade portion 53. In the first arrangement state, in a plan view (when viewed from the Z1 direction), the center of the first blade portion 52 is located downward from the plate-shaped portion 51 (the other surface 51b) in the axial direction of the rotation shaft 2 (Z2 direction). A first convex portion 54a that extends (protrudes) is provided. Further, in the first arrangement state, in a plan view (when viewed from the Z1 direction), the center of the second blade portion 53 is above the plate-shaped portion 51 (the other surface 51b) in the axial direction of the rotation shaft 2 (Z1 direction). ) Is provided with a second convex portion 55a extending (protruding). In the second arrangement state shown in FIG. 6, the arrangement of the first convex portion 54a and the second convex portion 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 and the second convex portion 55a has a height d2 smaller than d1. (D1> d2). Therefore, the distance d3 from the first blade portion 52 to the suction cover 32 in the first arrangement state is larger than the distance d4 (see FIG. 6) from the second blade portion 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 arranged in the vicinity of the suction cover 32, it is possible to apply a relatively large pressure to the water by the impeller 5a. It is possible to demonstrate the pump characteristics that a high lift can be obtained. On the other hand, in the first arrangement state shown in FIG. 5, a higher lift cannot be obtained by the impeller 5a as in the second arrangement state, but a relatively large gap is secured between the first blade portion 52 and the suction cover 32. Therefore, it is possible to facilitate the passage of foreign substances contained in water.

The other configurations of the third embodiment are the same as those of the first and second embodiments.

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

In the third embodiment, similarly to the first embodiment, the first blade portion 52 arranged on one surface side of the plate-shaped portion 51 and the second blade portion arranged on the other surface side of the plate-shaped portion 51. An impeller 5a that includes 53 and can be attached to and detached from the rotating shaft 2 by switching the arrangement of the first blade portion 52 and the second blade portion 53 to switch between the first arrangement state and the second arrangement state. 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 when it is desired to maintain the predetermined pump characteristics, the 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 into a shape capable of exhibiting different pump characteristics. As a result, the submersible pump 300 switches between the first arrangement state and the second arrangement state according to the usage situation of the submersible pump 300, such as when the water contains a large amount of foreign matter or when a high lift is required. The desired pump characteristics can be exhibited.

The other effects of the third embodiment are the same as those of the first and second embodiments.

(Modification example)
It should be noted that the embodiments disclosed this time are exemplary in all respects and are not considered to be restrictive. The scope of the present invention is shown by the scope of claims rather than the description of the above-described embodiment, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims.

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

Further, in the first to third embodiments, an example in which the first blade portion and the second blade portion are composed of four pieces is shown, but the present invention is not limited to this. In the present invention, the first blade portion and the second blade portion may be composed of 1 to 3 blades or 5 or more blades. Further, the number of the first blade portion and the number of the second blade portion may be different.

Further, in the first and second embodiments, an example is shown in which the first blade portion used at the power supply frequency of 60 Hz is shaped by removing a part of the second blade portion used at the power supply frequency of 50 Hz. The present invention is not limited to this. In the present invention, the first blade portion may be made smaller than the second blade portion and may be formed in a shape similar to that of the second blade portion.

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

Further, in the first to third embodiments, an example in which the submersible pump is provided with the cover member is shown, but the present invention is not limited to this. In the present invention, the submersible pump does not have to be provided with a cover member.

Further, in the first to third embodiments, an example in which a motor is used as the rotation drive unit of the present invention is shown, but the present 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 rotary drive unit.

Further, in the first to third embodiments, an example in which the cover member is formed in a flat plate shape or a tubular shape having one end opened is shown, 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 plate shape and a tubular shape having one end opened, such as a rod shape.

1 Motor (rotary drive unit)
2 Rotating shaft 5, 5a Impeller 6, 6a Cover member 51 Plate-shaped part 52 First blade part 53 Second blade part 54, 54a First convex part 55, 55a Second convex part 61 Flat plate part 61a Edge part 63 Side wall part 100, 200, 300 submersible pump

Claims (9)

Rotation drive unit and
A rotary shaft that transmits the driving force of the rotary drive unit,
A flat plate-shaped plate extending in a direction intersecting the axial direction of the rotating shaft, a first blade portion arranged on one surface side of the plate-shaped portion, and arranged on the other surface side of the plate-shaped portion. By including the second blade portion and exchanging the arrangement of the first blade portion and the second blade portion, it is possible to switch between the first arrangement state and the second arrangement state and attach / detach to / from the rotation shaft. Equipped with an impeller,
In the first arrangement state, the first blade portion is configured to function, and in the second arrangement state, the second blade portion is configured to function .
The impeller is provided with a cover member that covers the second blade portion in the first arrangement state, covers the first blade portion in the second arrangement state, and rotates with the impeller. pump. In the first arrangement state, the first blade portion is configured to function by watering the first blade portion, and in the second arrangement state, water is drawn by the second blade portion. The submersible pump according to claim 1, wherein the second blade portion is configured to function as a result. The submersible pump according to claim 1 or 2 , wherein the cover member includes a flat plate-shaped flat plate portion extending substantially parallel to the plate-shaped portion. The underwater according to claim 3 , wherein the cover member includes a side wall portion extending from an edge portion of the flat plate portion to the vicinity of the plate-shaped 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 4 , wherein the first blade portion and the second blade portion are curved in opposite directions in a plan view. The submersible pump according to any one of claims 1 to 5 , wherein the first blade portion and the second blade portion are configured to be used at different power supply frequencies. Any one of claims 1 to 5 , wherein the first blade portion in the first arrangement state and the second blade portion in the second arrangement state have shapes capable of exhibiting pump characteristics different from each other. The submersible pump according to item 1. In a plan view, a first convex portion and a second convex portion extending from the plate-shaped portion in the axial direction of the rotation axis are provided at the center of the first blade portion and the center of the second blade portion, respectively.
The first convex portion is configured to sandwich the cover member with the rotating shaft in the second arrangement state.
The submersible pump according to any one of claims 1 to 7 , wherein the second convex portion is configured to sandwich the cover member with the rotating shaft in the first arrangement state. A flat plate-shaped plate extending in a direction intersecting the axial direction of the rotation axis of the submersible pump,
The first blade portion arranged on one side of the plate-shaped portion and
A second blade portion arranged on the other side of the plate-shaped portion is provided.
The first blade portion and the second blade portion are configured so that they can be attached to and detached from the rotating shaft by switching between the first arrangement state and the second arrangement state by exchanging the arrangements with each other. Ori,
In the first arrangement state, the first blade portion is configured to function.
In the second arrangement state, the second blade portion is configured to function .
In the first arrangement state, the second blade portion is covered, and in the second arrangement state, the first blade portion is covered, and the impeller body including the plate-shaped portion, the first blade portion, and the second blade portion is included. An impeller for a submersible pump provided with a cover member that rotates with it.

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