JP2008082305A - Impeller and pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an impeller for a pump allowing a lid plate to be surely and easily mounted thereto without using a bolt. <P>SOLUTION: This impeller 2 is used for sucking a fluid from a suction port formed on one side in a direction of a rotating axis 6 to discharge it to the outside in the radial direction. A recessed part 12 for weight balance is formed on the other side opposite to the suction port; a step part 24 is formed on a circumferential edge part on the recessed part 12 formation side of an impeller body 10; a groove 25 is formed on the inner peripheral surface of the step part 12; a disc-like lid plate 27 closing an opening 12a of the recessed part 12 is fitted into the groove 25; a cut part communicating with a circumferential end from a central part is formed on the lid plate 27; and the lid plate 27 can be fitted into the groove 25 by being radially contracted by deformation in the direction of the rotating axis 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pump impeller and a pump device including the impeller.

  Conventionally, as this type of impeller, for example, as shown in FIG. 17, a boss portion 52 is formed at the center portion of the shroud 51 serving as the base of the impeller 50, and around the boss portion 52 on the back surface of the shroud 51, Some have an annular recess 53 formed to maintain a weight balance. A cover plate 54 that closes the opening 53 a of the annular recess 53 is attached to the back surface of the shroud 51 by a plurality of bolts 55.

  According to this, since the opening 53a of the annular recess 53 is closed by the cover plate 54, foreign matter can be prevented from accumulating in the annular recess 53, thereby causing overload and abnormal wear. It is possible to prevent the weight balance of the impeller 50 from being lost.

Patent Document 1 below discloses an impeller in which a cover plate that closes an annular recess is attached to a shroud with a plurality of bolts.
JP2004-218574

  However, in the above conventional type, since the head portion 55a of the bolt 55 protrudes upward and outward from the surface of the cover plate 54, there is a problem that foreign matters get entangled with the head portion 55a of the bolt 55 when the impeller 50 rotates. For this reason, there is a possibility that overload may occur or the weight balance of the impeller 50 may be lost.

Further, when the number of the bolts 55 is large, there is a problem that it takes time to attach the cover plate 54 to the back surface of the shroud 51. Further, the bolt 55 may be loosened and fall off.
The present invention is capable of reliably and easily mounting a cover plate without using bolts, and can prevent the impeller from overloading or impairing the weight balance of the impeller. It aims at providing the pump apparatus provided with the car and the impeller.

  In order to achieve the above object, the first aspect of the present invention is an impeller for a pump having a concave portion for weight balance on at least one side in the direction of the rotation axis, and the outer peripheral edge portion of the impeller body on the concave portion forming side. A groove is provided on the inner peripheral surface, and a plate-like lid plate that closes the opening of the recess is fitted into the groove, and the lid plate can be fitted into the groove by being reduced in the radial direction by deformation in the rotational axis direction. It is.

  According to this, by applying an external force to the cover plate and deforming the cover plate in the direction of the rotation axis, the cover plate is reduced in the radial direction, and the outer peripheral edge of the cover plate can be inserted into the groove. Then, by releasing the external force, the cover plate is restored to its original shape, and the cover plate is fitted into the groove. Accordingly, the cover plate can be easily attached to the impeller body without using a bolt.

  Further, since no bolt is used, the head of the bolt does not protrude outward from the surface of the cover plate, and there is no problem that foreign matter gets entangled with the head of the bolt. Therefore, it is possible to prevent the occurrence of overload caused by the entanglement of the foreign matter and the collapse of the weight balance of the impeller.

In the second invention, a suction port is formed on one side in the rotational axis direction, and a recess is formed on the other side opposite to the suction port, and the fluid is sucked from the suction port and discharged outward in the radial direction. .
According to this, in this type of impeller, the arrangement of the flow path in the impeller may not be axially symmetric, and in that case, a large recess for balance is required, or to reduce the weight of the impeller In some cases, a large recess is formed. By closing such a recess with a cover plate, it is possible to prevent the generation of water flow by the recess and prevent the pump efficiency from decreasing.

According to the third aspect of the present invention, the lid plate is formed with a cut portion communicating from the center portion to the outer peripheral end.
According to this, an external force is applied to the cover plate, and the cover plate is deformed in the direction of the rotation axis by approaching or overlapping one end and the other end of the cover plate facing each other through the cutting portion. Thus, the outer peripheral edge of the cover plate can be inserted into the groove. By releasing the external force, one end and the other end of the lid plate return to their original positions, the lid plate is restored to its original shape, and the lid plate is fitted into the groove.

  According to the fourth aspect of the present invention, a flat portion is provided on the concave portion forming side of the impeller body, the upper surface of the flat portion and the lower surface of the groove are substantially the same plane, and the cut portion of the lid plate fitted in the groove is the flat portion. An anti-rotation means is provided that overlaps the upper surface and prevents the rotation of the cover plate relative to the impeller body and fixes the cover plate at a position where the cut portion overlaps the upper surface of the flat portion.

  According to this, since the cut portion of the cover plate overlaps the upper surface of the flat portion, the cut portion and the concave portion do not communicate with each other. Therefore, foreign matter mixed in the fluid passes from the outside through the cut portion into the concave portion. Intrusion can be prevented.

  In addition, the lid plate is prevented from rotating in the circumferential direction inadvertently with respect to the impeller body, and therefore, the cut portion of the lid plate is prevented from being displaced in the circumferential direction from the upper surface of the flat portion and overlapping the concave portion. Can do.

According to the fifth aspect of the present invention, there is provided a suspending means for preventing the central portion of the lid plate from being lifted in the direction of the rotational axis.
According to this, it can prevent that the center part of a cover plate floats carelessly, a cover plate deform | transforms into a rotating shaft center direction, and falls out of a groove | channel. Thereby, a cover board can be reliably mounted | worn with an impeller main body.

In the sixth aspect of the invention, the lid plate is composed of a plurality of divided pieces divided in the radial direction.
According to this, by applying an external force to the divided piece and deforming the divided piece in the direction of the rotation axis, the divided piece can be reduced in the radial direction, and the outer peripheral edge of the divided piece can be inserted into the groove. By releasing the external force, the divided piece is restored to the original shape, and the divided piece is fitted into the groove. By fitting all the plurality of divided pieces into the grooves in this way, the cover plate can be easily attached to the impeller body without using bolts.

  The seventh invention is a pump device comprising the impeller according to any one of the first to sixth inventions.

  As described above, according to the present invention, the cover plate can be easily attached to the impeller body without using a bolt. Further, since no bolt is used, the head of the bolt does not protrude outward from the surface of the cover plate, and there is no problem that foreign matter mixed into the fluid gets entangled with the head of the bolt. Therefore, it is possible to prevent the occurrence of overload caused by the entanglement of the foreign matter and the collapse of the weight balance of the impeller. Furthermore, it is possible to suppress the generation of a water flow due to the concave portion and prevent the pump efficiency from being lowered.

Further, since the cut portion of the cover plate overlaps the upper surface of the flat portion, the cut portion and the recess are not communicated with each other, and foreign matter can be prevented from entering the recess through the cut portion.
Further, the rotation preventing means can prevent the cut portion of the cover plate from being displaced in the circumferential direction from the upper surface of the flat portion and overlapping the concave portion.

Further, the floating preventing means can prevent the central portion of the cover plate from being inadvertently lifted and the cover plate from being deformed in the direction of the rotation axis and falling off the groove.
Moreover, the cover plate can be easily mounted on the impeller body without using bolts by fitting all the plurality of divided pieces into the grooves.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
First, the first embodiment will be described with reference to FIGS.

  As shown in FIG. 1, reference numeral 1 denotes a submersible pump having a non-clog type impeller 2. The impeller 2 is provided inside the casing 3, and a casing suction port 4 that opens downward is formed in the lower portion of the casing 3, and a casing discharge port 5 that opens sideways is formed on the side of the casing 3. Is formed. A motor 7 that rotates the impeller 2 about the rotation axis 6 in the vertical direction is provided on the upper portion of the casing 3.

The impeller 2 is configured as follows.
As shown in FIGS. 2 to 4, the impeller 2 includes an impeller body 10, an impeller suction port 13, an impeller discharge port 14, and a spiral flow path 15 formed in the impeller body 10. And have. The impeller body 10 maintains a weight balance with a pair of upper and lower disk-shaped flange portions 17 and 18, a blade plate portion 19 provided between the upper and lower flange portions 17 and 18, and the cylindrical boss portion 11. The recess 12 is provided.

  The impeller suction port 13 is formed in the lower part of the impeller body 10 (one in the direction of the rotational axis 6). The impeller discharge port 14 is formed between the upper and lower flange portions 17 and 18, and the flow path 15 communicates with the impeller suction port 13 and the impeller discharge port 14. Note that water (an example of fluid) that flows in from the casing suction port 4 is sucked in from the impeller suction port 13, passes through the flow path 15, and is discharged radially outward from the impeller discharge port 14.

  The boss part 11 and the recessed part 12 are formed on the upper part (the other in the direction of the rotation axis 6) of the impeller body 10 on the opposite side to the impeller suction port 13. Among these, the boss part 11 protrudes above the impeller body 10, and a shaft hole 16 is formed in the boss part 11. As shown in FIG. 1, the lower portion of the rotating shaft 7 a of the motor 7 is fitted in the shaft hole 16 and connected to the boss portion 11 by a nut 20. As shown in FIGS. 2 and 3, the recess 12 is formed not over the entire circumference of the boss portion 11 but over the remaining predetermined range A excluding a part of the fan-shaped flat portion 23, and upward. It has an opening 12a that opens.

  A stepped portion 24 rising from the flat portion 23 is formed on the outer peripheral edge portion of the upper flange portion 17 (on the concave portion 12 forming side) of the impeller body 10 over the entire circumference. The step portion 24 has an inner peripheral surface facing the outer peripheral surface of the boss portion 11, and a groove 25 is formed on the inner peripheral surface of the step portion 24 over the entire periphery.

  As shown in FIGS. 5 to 7, a disc-like lid plate 27 that closes the opening 12 a of the recess 12 is fitted in the groove 25. A boss through hole 28 is formed at the center of the cover plate 27, and the boss 11 is inserted into the boss through hole 28. Further, the lid plate 27 is formed with a cutting portion 29 that communicates from the boss through hole 28 (center portion) to the outer peripheral end in the radial direction.

The material of the lid plate 27 may be appropriately selected according to use conditions such as a metal such as a steel plate, a synthetic resin, or a laminate of rubber and a metal plate.
As shown in FIG. 5, the lower surface 25a of the groove 25, the upper surface 23a of the flat portion 23, and the step surface 11a formed on the outer periphery of the boss portion 11 are substantially on the same plane (they are flush with each other). The cover plate 27 fitted into the cover 25 is supported from below by the upper surface 23 a of the flat portion 23, the lower surface 25 a of the groove 25, and the step surface 11 a of the boss portion 11.

  As shown in FIG. 7, one end portion 27 a and the other end portion 27 b in the circumferential direction of the cover plate 27 facing each other through the cutting portion 29 are separated by a certain distance B. As shown by the phantom lines in FIG. 7, the one end 27 a and the other end 27 b are brought close to each other so that the lid plate 27 has a central portion higher in the direction of the rotation axis 6 and an outer peripheral edge at the rotation axis 6. It is comprised so that it may deform | transform into a mountain shape (conical truncated cone shape) so that it may become a lower direction. By such deformation, the cover plate 27 can be reduced in the radial direction and fitted into the groove 25. In addition, the said fixed space | interval B is a taper shape which becomes so narrow that it approaches the center part of the cover board 27, and becomes wide, so that it approaches the outer periphery.

  In the lid plate 27, a pair of attachment / detachment holes 31 are formed so as to be distributed to both sides around the cutting portion 29. As shown in FIG. 8, by inserting both claws 32a of the plier 32, which is an example of a detachable tool, into both the detachable holes 31, and opening and closing the handle 32b of the plier 32, the one end portion 27a of the lid plate 27 and The lid plate 27 can be deformed by bringing the other end portion 27b close thereto.

  As shown in FIGS. 2, 3, and 6, the cover plate 27 is prevented from rotating with respect to the impeller body 10 by the rotation preventing means 33. The anti-rotation means 33 includes the attachment / detachment hole 31 and a pair of anti-rotation protrusions 34 formed in the flat portion 23. By inserting the rotation preventing projection 34 into the attachment / detachment hole 31, the cover plate 27 is fixed in the circumferential direction, and the cutting portion 29 overlaps the upper surface 23 a of the flat portion 23.

  As shown in FIGS. 2, 3, 5, and 6, the boss 11 has an anti-floating protrusion on the outer peripheral surface of the boss 11 that prevents the cover plate 27 from lifting upward (in the direction of the rotational axis 6). A portion 35 (an example of a float prevention means) is provided. The suspending protrusion 35 protrudes radially outward from the outer peripheral surface of the boss portion 11, is positioned 180 ° opposite to the flat portion 23, and has a predetermined interval above the step surface 11 a of the boss portion 11. Open and face each other.

Hereinafter, the operation of the above configuration will be described.
When the cover plate 27 is attached to the impeller body 10, as shown in FIG. 8A, first, both claws 32 a of the plier 32 are inserted into both attachment / detachment holes 31 to open and close the handle 32 b of the plier 32. As a result, an external force F is applied to the lid plate 27, the one end portion 27a and the other end portion 27b of the lid plate 27 are brought close to each other, and the lid plate 27 is deformed from a flat plate shape to a mountain shape (see a virtual line in FIG. 7). . Thereby, the diameter of the cover plate 27 is reduced, and the outer peripheral edge of the cover plate 27 can be inserted into the groove 25. At this time, the position of the cutting part 29 is matched with the position of the protrusion 35 for anti-floating and the boss part 11 is inserted into the boss through hole 28.

  Then, by releasing the external force F and removing both the claws 32a of the plier 32 from the both attachment / detachment holes 31, as shown in FIG. 8B, the one end portion 27a of the cover plate 27 approaching each other and The other end portion 27 b is separated from the original position, the cover plate 27 is restored from the mountain shape to the original flat plate shape, and the cover plate 27 is fitted into the groove 25. Further, when the original shape is not completely restored, an external force is appropriately applied to adjust the shape of the cover plate 27 to a flat plate shape.

  Thereafter, as shown in FIG. 8 (c), the lid plate 27 is rotated about 180 ° with respect to the impeller body 10, and both the anti-rotation projections 34 are inserted into the both attachment / detachment holes 31, thereby The plate 27 is fixed in the circumferential direction and does not rotate in the circumferential direction inadvertently with respect to the impeller body 10. Therefore, it is possible to prevent the cut portion 29 of the cover plate 27 from being displaced in the circumferential direction from the upper surface 23a of the flat portion 23 and overlapping the concave portion 12, so that the cut portion 29 and the concave portion 12 do not communicate with each other. It is possible to prevent the foreign matter mixed in from entering the recess 12 through the cutting portion 29 from the outside.

  Thus, the lid plate 27 can be easily attached to the impeller body 10 without using bolts. Further, the head of the bolt does not protrude upward from the surface of the lid plate 27, and the problem that the foreign matter gets entangled with the head of the bolt does not occur. Therefore, generation | occurrence | production of the overload resulting from the entanglement of a foreign material and collapse of the weight balance of the impeller 2 can be prevented.

  As shown in FIG. 5, the stepped portion 24 protrudes upward from the surface of the lid plate 27, but the height of the protruding portion can be made significantly lower than the height of the head of the bolt. Furthermore, since the protruding portion has a continuous annular shape, there is very little possibility that a foreign matter will get entangled with the stepped portion 24 as compared with the head portion of the bolt.

  Further, in the state where the cover plate 27 is fitted in the groove 25 and the anti-rotation projection 34 is inserted into the attachment / detachment hole 31 as described above, the cover plate 27 has the upper surface 23 a of the flat portion 23 and the lower surface of the groove 25. 25a and the stepped surface 11a of the boss part 11 are supported from below. At this time, a part of the peripheral edge of the boss through hole 28 of the lid plate 27 is inserted between the stepped surface 11 a of the boss portion 11 and the floating projection 35, and the central portion of the lid plate 27 is formed by the floating projection 35. The part can be prevented from floating. Therefore, the central portion of the cover plate 27 is not carelessly lifted and the cover plate 27 is not deformed into a mountain shape, so that the cover plate 27 can be prevented from falling out of the groove 25, and the cover plate 27 can be securely attached. Can be installed.

  After the cover plate 27 is mounted on the impeller body 10 as described above, the impeller 2 is connected to the rotating shaft 7a and the motor 7 is operated, whereby the impeller 2 rotates in a predetermined direction C, and water is supplied. The air is sucked from the casing suction port 4, passes through the flow path 15 in the impeller body 10 through the impeller suction port 13, is discharged radially outward from the impeller discharge port 14, and is discharged from the casing discharge port 5. .

In addition, what is necessary is just to perform the said attachment procedure reversely, when removing the cover plate 27 from the impeller main body 10. FIG.
Further, the attachment / detachment hole 31 is used when attaching / detaching the cover plate 27 to / from the impeller body 10 and also used to prevent the cover plate 27 from rotating with respect to the impeller body 10. It is not necessary to provide an anti-rotation hole separately from the hole 31. Thereby, the number of holes formed in the cover plate 27 is reduced, and the processing of the cover plate 27 is facilitated.

(Embodiment 2)
In the first embodiment described above, the lid plate 27 is deformed into a mountain shape using the plier 32 as shown in FIG. 8, but in the second embodiment, the operator's finger is not used without using the plier 32. The cover plate 27 is inserted into the attachment / detachment hole 31 so that the one end portion 27a and the other end portion 27b of the cover plate 27 are brought close to each other to deform the cover plate 27 into a mountain shape. For this reason, as shown in FIG. 9, the diameter of the hole 31 for attachment / detachment is set larger than Embodiment 1 so that an operator's finger | toe can be inserted. Further, the diameter of the anti-rotation protrusion 34 is set larger than that of the first embodiment in accordance with the size of the attachment / detachment hole 31.

  In each of the above embodiments, the anti-rotation means 33 is constituted by the attaching / detaching hole 31 and the anti-rotation protrusion 34. However, the present invention is not limited to this configuration. The lid plate 27 may be prevented from rotating by being configured with a groove and a convex portion, forming the groove in the flat portion 23, providing the convex portion at the lower portion of the lid plate 27, and engaging the convex portion with the groove. .

  Further, when the lid plate 27 is mounted, the lid plate 27 is deformed into a mountain shape. However, when the lid plate 27 is deformed into a mountain shape using a press or the like in advance, Alternatively, an external force may be applied to return the cover plate 27 from the mountain shape to the planar shape.

(Embodiment 3)
In the first and second embodiments described above, as shown in FIGS. 7 and 9, the distance between the one end 27 a and the other end 27 b of the cover plate 27 becomes narrower toward the center of the cover plate 27 and approaches the outer periphery. In the third embodiment, as shown in FIG. 10, the one end portion 27a and the other end portion 27b are parallel to each other, and the distance between the one end portion 27a and the other end portion 27b is the boss through hole. The same diameter as 28 is set.

  According to this, when the boss part 11 is inserted into the boss through hole 28, the boss part 11 is inserted into the boss through hole 28 from the side of the cover plate 27 (direction perpendicular to the rotation axis 6) through the cutting part 29. Can do. Therefore, the cover plate 27 can be attached and detached while the impeller 2 is still connected to the rotating shaft 7 a of the motor 7.

(Embodiment 4)
In the first embodiment described above, as shown in FIG. 2, as an example of the floating means, the floating projection 35 is formed on the outer peripheral surface of the boss portion 11. As shown in FIG. 11, as another example of the floating preventing means, a floating retaining ring 40 (C ring or the like) is detachably attached to the outer peripheral surface of the boss portion 11. The retaining ring 40 for floating prevention is fitted into a ring groove 41 formed on the outer peripheral surface of the boss portion 11.

  According to this, the lid plate 27 is fitted into the groove 25, and the anti-rotation protrusions 34 are inserted into the both attachment / detachment holes 31 to prevent the lid plate 27 from rotating. Thereafter, the retaining ring 40 for floating prevention is fitted into the ring groove 41. Thereby, it is possible to prevent the central portion of the cover plate 27 from being lifted.

(Embodiment 5)
In the first embodiment described above, as shown in FIG. 7, in the cutting part 29, the one end part 27a and the other end part 27b of the cover plate 27 are separated by a certain distance B. In the fifth embodiment, as shown in FIGS. 12 and 13, the one end portion 27 a and the other end portion 27 b are in contact with each other at the cutting portion 29.

  According to this, by inserting both claws 32a of the plier 32 into the attachment / detachment holes 31, and opening / closing the handle 32b of the plier 32, an external force F is applied to the lid plate 27, and as shown in FIG. One end portion 27a and the other end portion 27b of the plate 27 are overlapped, and the cover plate 27 is deformed from a flat plate shape to a mountain shape as indicated by an imaginary line in FIG. Thereby, the diameter of the cover plate 27 is reduced, and the outer peripheral edge of the cover plate 27 can be inserted into the groove 25.

In the fifth embodiment, the one end 27a and the other end 27b of the lid plate 27 are in contact with each other, but a slight gap may be formed between the one end 27a and the other end 27b.
(Embodiment 6)
In the first embodiment described above, as shown in FIG. 6, the rotation preventing means 33 is configured by the attaching / detaching hole 31 and the rotation preventing projection 34, but in the present sixth embodiment, it is shown in FIG. 14. As described above, the anti-rotation means 33 includes only a pair of anti-rotation projections 34. That is, in the state where the lid plate 27 is fitted in the groove 25, the both-rotation preventing projections 34 are fitted into the cut portions 29 of the lid plate 27.

  According to this, when the cover plate 27 tries to rotate in the circumferential direction with respect to the impeller body 10, one end portion 27 a of the cover plate 27 comes into contact with one rotation-preventing protrusion 34 or the other end of the cover plate 27. Since the portion 27b contacts the other anti-rotation projection 34, the lid plate 27 is fixed in the circumferential direction and does not rotate in the circumferential direction inadvertently with respect to the impeller body 10.

(Embodiment 7)
Next, a seventh embodiment of the present invention will be described with reference to FIG.
An inclined surface 44 is formed on the inner peripheral surface of the step portion 24 of the impeller body 10 over the entire periphery. The inclined surface 44 is located above the groove 25 and is inclined outward in the radial direction toward the upper side. The diameter D1 of the upper end portion of the inclined surface 44 is set to be larger than the diameter D2 of the lid plate 27.

Hereinafter, the operation of the above configuration will be described.
When attaching the lid plate 27 to the impeller body 10, first, the position of the cutting portion 29 of the lid plate 27 is aligned with the position of the suspending projection 35, and the boss portion 11 is inserted into the boss through hole 28, The outer peripheral edge of the plate 27 is placed on the inclined surface 44. Next, in this state, as shown in FIG. 15A, an external force F is applied downward from above the cover plate 27, and the cover plate 27 is pressed downward by this external force F. Thereby, although it is a short time, the one end part 27a and the other end part 27b of the cover plate 27 approach, and the cover plate 27 has the center part rotated in the lower direction of the rotation axis 6 and the outer peripheral edge part rotated. It deforms instantaneously into an inverted mountain shape (inverted frustoconical shape) that is higher in the direction of the axis 6. As a result, the diameter D2 of the cover plate 27 is instantaneously reduced, and the outer peripheral edge of the cover plate 27 is fitted into the groove 25 as shown in FIG. 15 (b). Restore to a flat plate shape.

  Thereafter, the lid plate 27 is fixed in the circumferential direction by rotating the lid plate 27 about 180 ° with respect to the impeller body 10 and inserting the both-rotation-preventing projections 34 into the both attachment / detachment holes 31. There is no inadvertent rotation in the circumferential direction with respect to the impeller body 10.

  Thus, the lid plate 27 can be easily attached to the impeller body 10 without using bolts. Further, the head of the bolt does not protrude upward from the surface of the lid plate 27, and the problem that the foreign matter gets entangled with the head of the bolt does not occur. Therefore, generation | occurrence | production of the overload resulting from the entanglement of a foreign material and collapse of the weight balance of the impeller 2 can be prevented.

  Further, in the state where the cover plate 27 is fitted in the groove 25 and the anti-rotation projection 34 is inserted into the attachment / detachment hole 31 as described above, the central portion of the cover plate 27 is moved by the anti-floating projection 35. It can be prevented from floating.

(Embodiment 8)
Next, an eighth embodiment of the present invention will be described with reference to FIG.
The lid plate 27 is composed of two semi-disc-like divided pieces 46 and 47 divided in the radial direction. The boss through hole 28 is also divided into two semi-circles and formed into divided pieces 46 and 47. As shown by the solid line in FIG. 16 (b), by bringing both end portions 46a and 46b of one divided piece 46 apart from each other by approximately 180 °, the one divided piece 46 has a central portion in the direction of the rotation axis 6 in the direction of the rotation axis 6. It is configured to be deformed into a mountain shape such that the upper part and the outer peripheral edge part are the lower part in the direction of the rotation axis 6. The other divided piece 47 is also configured to be similarly deformed. By such a deformation, both the split pieces 46 and 47 can be reduced in the radial direction and fitted into the groove 25.

Hereinafter, the operation of the above configuration will be described.
As shown by a solid line in FIG. 16B, an external force F facing each other is applied to one divided piece 46, both end portions 46a and 46b of one divided piece 46 are brought close to each other, and one divided piece 46 is formed in a mountain shape. To deform. As a result, one of the divided pieces 46 is reduced in the radial direction, and the outer peripheral edge of the one divided piece 46 can be inserted into the groove 25. Thereafter, by releasing the external force F, as shown by the phantom line in FIG. 16B, both end portions 46a and 46b of one divided piece 46 are separated to the original position, and one divided piece 46 is restored to the original position. The one flat piece 46 is fitted into the groove 25.

Further, the other divided piece 47 can be similarly deformed and fitted into the groove 25.
Thereby, the cover plate 27 can be easily attached to the impeller body 10 without using a bolt. Further, the head of the bolt does not protrude upward from the surface of the lid plate 27, and the problem that the foreign matter gets entangled with the head of the bolt does not occur. Therefore, generation | occurrence | production of the overload resulting from the entanglement of a foreign material and collapse of the weight balance of the impeller 2 can be prevented.

In the above-described eighth embodiment, the lid plate 27 is divided into two divided pieces 46 and 47, but may be divided into three or more.
In each of the above embodiments, the weight balance recess 12 is formed in the upper part of the impeller body 10, but it may be formed in the lower part of the impeller body 10 and similarly closed by the cover plate 27.

In each of the above embodiments, water is used as an example of the fluid, but the present invention is not limited to water.
In each of the above embodiments, the non-clog type impeller 2 is used as the impeller, but the present invention is not limited to the non-clog type, and other types of impellers may be used.

  In each of the above embodiments, the motor 7 of the submersible pump 1 is arranged on the top and the impeller 2 is arranged on the bottom. However, the arrangement is not limited to this, and the submersible pump 1 is arranged upside down. Alternatively, the submersible pump 1 may be disposed sideways, and the direction of the submersible pump 1 may be selected as appropriate.

It is sectional drawing of the pump provided with the impeller in Embodiment 1 of this invention. It is a perspective view of an impeller and shows the state which removed the cover plate. It is a top view of an impeller and shows the state which removed the cover plate. FIG. 2 is a cross-sectional view of the impeller, in which (a) is a cross-sectional view orthogonal to the rotation axis, (b) is a view taken along the line XX in FIG. 3, and (c) is a view taken along the line Y-Y in FIG. The figure is shown. It is a longitudinal cross-sectional view of the upper part of the impeller equipped with the cover plate. It is a XX arrow line view in FIG. It is a figure of the cover plate with which an impeller is mounted | worn similarly, (a) is a top view of a cover plate, (b) shows the XX arrow view in (a). It is a figure which shows the method at the time of mounting | wearing an impeller with a cover plate. It is a top view of the cover plate with which the impeller in Embodiment 2 of this invention is mounted | worn. It is a top view of the cover plate with which the impeller in Embodiment 3 of this invention is mounted | worn. It is a figure of the impeller in Embodiment 4 of this invention, (a) is a longitudinal cross-sectional view of the upper part of the impeller with which the cover plate was mounted | worn, (b) shows the top view of the impeller with which the cover plate was mounted | worn. It is a figure of the cover plate with which the impeller in Embodiment 5 of this invention is mounted | worn, (a) is a top view of a cover plate, (b) shows the XX arrow view in (a). It is a perspective view which shows the state which deform | transformed the cover plate with which it mounts on an impeller similarly in a mountain shape. It is a cross-sectional view orthogonal to the rotational axis of the impeller in Embodiment 6 of this invention. It is a figure which shows the method at the time of attaching a cover board to the impeller in Embodiment 7 of this invention. It is a figure of the cover plate with which the impeller in Embodiment 8 of this invention is mounted | worn, (a) has shown the state which has not changed the division | segmentation piece, (b) has shown the state which changed the division | segmentation piece. It is a longitudinal cross-sectional view of the conventional impeller.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Submersible pump 2 Impeller 6 Rotating shaft center 10 Impeller main body 12 Recessed part 12a Opening part 13 Impeller inlet 23 Flat part 23a Upper surface 25 Groove 27 Cover plate 29 Cutting part 33 Anti-rotation means 35 Floating part means)
40 Retaining ring for floating prevention (floating prevention means)
46, 47 pieces

Claims (7)

An impeller for a pump having a recess for weight balance in at least one of the directions of the rotation axis,
A groove is provided on the inner peripheral surface of the outer peripheral edge of the impeller body on the recess forming side,
A plate-like lid that closes the opening of the recess is fitted into the groove,
An impeller characterized in that the cover plate can be fitted into the groove by being reduced in the radial direction by deformation in the direction of the rotation axis. A suction port is formed on one side in the rotational axis direction,
The recess is formed on the other side opposite to the suction port,
The impeller according to claim 1, wherein the fluid is sucked from the suction port and discharged radially outward. The impeller according to claim 1 or 2, wherein a cut portion communicating from the center portion to the outer peripheral end is formed in the lid plate. A flat portion is provided on the concave portion forming side of the impeller body,
The upper surface of the flat portion and the lower surface of the groove are substantially the same plane,
The cut part of the cover plate fitted in the groove overlaps the upper surface of the flat part,
4. The impeller according to claim 3, further comprising a detent means for preventing the rotation of the cover plate relative to the impeller body and fixing the cover plate at a position where the cutting portion overlaps the upper surface of the flat portion. The impeller according to any one of claims 1 to 4, further comprising a flotation preventing unit that prevents the central portion of the cover plate from being lifted in the direction of the rotation axis. The impeller according to claim 1 or 2, wherein the cover plate is composed of a plurality of divided pieces divided in a radial direction. A pump apparatus comprising the impeller according to any one of claims 1 to 6.

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