Pump impeller, pump using same, and pump impeller balancing method

Abstract

To provide an impeller for a pump which enables proper balance adjustment even when an impeller is processed, and to provide a pump using the impeller for the pump and a balance adjustment method of the impeller for the pump.SOLUTION: An impeller 100 for a pump includes: a main plate 110 which has a substantially disc shape and in which a hub is provided at a center on one axial surface side; and one blade 120 formed in a substantially spiral shape from the center of the main plate 110 in an outer periphery direction on the other surface side opposite to the one surface side of the main plate 110. A groove 130 is formed in at least a part of a side surface forming an outer periphery of the main plate 110.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pump impeller, a pump using the same, and a method for adjusting the balance of a pump impeller. [Background technology]

[0002] Generally, sewage pumps use impellers with a single blade formed in a roughly spiral shape, which is necessary to ensure a large flow path (passage diameter) to prevent foreign matter from clogging the pump. Because the blade of this impeller is asymmetrical with respect to the rotation axis, balance adjustments are made by removing part of the impeller or adding a weight.

[0003] For example, Patent Document 1 discloses that the balance of the impeller is adjusted by providing a circumferential flange portion on the outer periphery of the main body and attaching a balance block to the inner periphery of the flange portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-140931 Summary of the Invention [Problem to be solved by the invention]

[0005] However, impellers may be machined to achieve the desired head and flow depending on the pump they are used in. Even if the impeller is properly balanced, machining the impeller can cause it to lose its balance, requiring further balancing.

[0006] Therefore, an object of the present invention is to provide a pump impeller that can be properly balanced even when the impeller is machined, a pump using the same, and a method for balancing a pump impeller. [Means for solving the problem]

[0007] A pump impeller according to one embodiment of the present invention has a generally disk-shaped main plate with a hub provided in the center of one axial side, and one blade formed in a generally spiral shape from the center of the main plate toward the outer periphery on the other side of the main plate opposite the one side, and a groove formed in at least a part of the side that forms the outer periphery of the main plate.

[0008] Another aspect of the present invention provides a pump impeller comprising a generally disk-shaped main plate having a hub at the center of one axial side thereof, one blade formed in a generally spiral shape from the center of the main plate toward the outer periphery on the other side of the main plate opposite the one side, and a generally disk-shaped side plate arranged opposite the main plate via the one blade, and a groove formed in at least a portion of at least one of the side surfaces forming the outer periphery of the main plate and the side plate.

[0009] In the above aspect, the grooves may be formed on the side surfaces of the main plate and the side plate that have larger outer diameters.

[0010] In the above embodiment, the groove may be formed in at least a part of the side surface within a range of ±90° from the maximum outer diameter part of the blade, which is the tip position of one blade.

[0011] In the above embodiment, the groove may be formed in the side surface in a range including the tip position of one blade, that is, the maximum outer diameter portion of the blade.

[0012] A pump according to one aspect of the present invention comprises a motor, a rotating shaft that rotates when the motor is driven, and the above-mentioned pump impeller that rotates in conjunction with the rotation of the rotating shaft, thereby generating a flow from the suction port to the discharge port.

[0013] A method for balancing a pump impeller according to one aspect of the present invention is for a pump impeller having a generally disk-shaped main plate with a hub provided at the center of one axial side of the main plate, and one blade formed in a generally spiral shape from the center of the main plate toward the outer periphery on the other side of the main plate opposite the one axial side, and having a groove formed on at least a portion of the side surface forming the outer periphery of the main plate, by grinding the side surface of the main plate together with the blade from the maximum outer diameter part of the blade, which is the tip position of the blade, and further grinding at least a portion of the pump impeller or adding a weight.

[0014] Another aspect of the present invention provides a method for balancing a pump impeller, which includes a substantially disk-shaped main plate having a hub at the center of one axial side of the main plate, one blade formed in a substantially spiral shape from the center of the main plate toward the outer periphery on the other side of the main plate opposite the one axial side, and a substantially disk-shaped side plate arranged to face the main plate via the one blade, and in which a groove is formed in at least a portion of at least one of the side surfaces forming the outer periphery of the main plate and the side plate, the method comprises: machining at least one of the side surfaces of the main plate and the side plate together with the blade from the maximum outer diameter portion of the blade, which is the tip position of the blade, on the side surface; and further machining at least a portion of the pump impeller or adding a weight. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a pump impeller that can be properly balanced even when the impeller is machined, a pump using the same, and a method for balancing a pump impeller. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is an external perspective view showing the configuration of a pump impeller 100 according to a first embodiment of the present invention. [Figure 2] 1 is a perspective view showing the shape of a blade 120 in a pump impeller 100 according to a first embodiment of the present invention. [Figure 3] FIG. 2 is a bottom view of the pump impeller 100 according to the first embodiment of the present invention, as viewed from the other surface side on which the blades 120 are arranged. [Figure 4] 2 is a diagram showing the position and range of a groove 130 formed in a main plate 110 in a pump impeller 100 according to a first embodiment of the present invention. FIG. [Figure 5] 2 is a diagram showing an example of a groove 130 formed in a main plate 110 in the pump impeller 100 according to the first embodiment of the present invention. FIG. [Figure 6] 3A to 3C are diagrams schematically showing how the outer diameter of the main plate 110 is cut in the pump impeller 100 according to the first embodiment of the present invention. [Figure 7] FIG. 2 is a diagram for explaining the mechanical balance of the pump impeller 100 according to the first embodiment of the present invention, with the main plate 110 and the blades 120 separated. [Figure 8] FIG. 1 is a diagram showing an example in which grooves 131 are formed in an area that does not include tips 123 of blades 120 in pump impeller 100 according to the first embodiment of the present invention. [Figure 9] 1 is a diagram showing an example in which a plurality of grooves 132 are formed in the pump impeller 100 according to the first embodiment of the present invention. FIG. [Figure 10] FIG. 10 is an external perspective view showing the configuration of a pump impeller 200 according to a second embodiment of the present invention. [Figure 11] FIG. 1 is an external perspective view showing the configuration of a pump impeller 300 in which the outer diameters of the main plate and the side plates are the same. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that each embodiment described below is merely a specific example for carrying out the present invention and is not intended to limit the scope of the present invention. Furthermore, to facilitate understanding of the description, the same components in each drawing will be designated by the same reference numerals wherever possible, and duplicate descriptions may be omitted.

[0018] First Embodiment [Pump impeller configuration] Fig. 1 is an external perspective view showing the configuration of a pump impeller 100 according to a first embodiment of the present invention. As shown in Fig. 1, the pump impeller 100 is a so-called open-type impeller that includes a main plate 110 and blades 120, and grooves 130 are formed in the main plate 110. Note that, for example, the pump impeller 100 is generally mechanically balanced, and in this case, it is considered to be mechanically balanced when grooves 130 are formed in at least a portion of the side surface that forms the outer periphery of the main plate 110.

[0019] The main plate 110 is substantially disk-shaped, with a hub provided in the center of one surface in the axial direction, and a groove 130 formed in part of the side surface that forms the outer periphery of the main plate 110.

[0020] The blades 120 are formed in a generally spiral shape from the center of the main plate 110 toward the outer periphery on the other side of the main plate 110, which is opposite to the one side.

[0021] Fig. 2 is a perspective view showing the shape of the blades 120 in the pump impeller 100 according to the first embodiment of the present invention. Fig. 2 shows a perspective view of the main plate 110 as seen from the other surface on which the blades 120 are arranged, and as shown in Fig. 2, the blades 120 are formed in a substantially spiral shape on the other surface of the main plate 110 from the center toward the outer periphery of the main plate 110. The tips 123 of the blades 120 reach the side surface that forms the outer periphery of the main plate 110.

[0022] More specifically, as the pump impeller 100 rotates, the front and back surfaces of the blades 120, which are formed in a substantially spiral shape, are divided into a pressure surface 121 where pressure increases and a suction surface 122 where pressure decreases. Here, the pressure surface 121 is the wall surface of the blade 120 on the outer periphery side of the main plate 110, and the suction surface 122 is the wall surface of the blade 120 on the center side of the main plate 110.

[0023] The maximum outer diameter portion of the pressure surface 121 reaches the side surface that forms the outer periphery of the main plate 110. In other words, the tip 123 of the blade 120 has the maximum outer diameter of the blade 120, and coincides with the outer diameter of the main plate 110.

[0024] 3 is a bottom view of the pump impeller 100 according to the first embodiment of the present invention, seen from the other surface side where the blades 120 are arranged. As shown in FIG. 3, the tip 123 of the blade 120 (the maximum outer diameter portion of the pressure surface 121) coincides with the outer diameter of the main plate 110.

[0025] 1, the grooves 130 are formed in at least a part of the side surface that forms the outer periphery of the main plate 110. The positions and ranges in which the grooves 130 are formed will be described in detail below.

[0026] [Groove location and range] Fig. 4 is a diagram showing the position and range of grooves 130 formed in the main plate 110 of the pump impeller 100 according to the first embodiment of the present invention. As shown in Fig. 4, the grooves 130 are formed on the side surface of the main plate 110, and are preferably formed within a range of ±90° from the maximum outer diameter portion of the blade 120, which is the tip 123 of the blade 120.

[0027] Fig. 5 is a diagram showing an example of grooves 130 formed in the main plate 110 of the pump impeller 100 according to the first embodiment of the present invention. Fig. 5 shows a plan view of the main plate 110 as seen from one surface on which the hub is provided, and as shown in Fig. 5, the grooves 130 are formed in an area including the tips 123 of the blades 120.

[0028] For example, the groove 130 is formed on the side surface of the main plate 110 in a range including the tip 123 of the blade 120, from the tip 123 of the blade 120 to the side on which the blade 120 is formed, within a predetermined range (for example, within 90°, such as 60° from the tip 123 of the blade 120) along the side surface of the main plate 110. The pump impeller 100 is mechanically balanced with the groove 130 formed in this manner on part of the side surface of the main plate 110. It is preferable that the groove 130 is formed so as to achieve mechanical balance, and for example, it is preferable that the width (the size in the radial direction of the main plate 110) is about 2 to 4% of the radius of the main plate 110, and the thickness (the size in the thickness direction of the main plate 110) is about 40 to 70% of the thickness of the main plate 110.

[0029] The pump impeller 100 may be used after its outer diameter is machined to obtain a desired head or flow rate depending on the pump to be used.

[0030] Fig. 6 is a diagram schematically showing how the outer diameter of the main plate 110 is cut in the pump impeller 100 according to the first embodiment of the present invention. As shown in Fig. 6, for example, the main plate 110 is cut along cutting lines 111 so that the outer diameter of the main plate 110 becomes smaller, and when the side surface of the main plate 110 is cut, the area in which the grooves 130 are formed is also cut.

[0031] At this time, the side of the main plate 110 is scraped off, but since the maximum outer diameter of the blade 120 is the same as the outer diameter of the main plate 110, the blade 120, along with the side of the main plate 110, is also gradually scraped off from the tip 123 (maximum outer diameter part) of the blade 120 towards the center.

[0032] Here, when the side surface of the main plate 110 is cut along the cutting line 111, the mechanical balance of the pump impeller 100 is lost in an area where the blades 120 are present (for example, the L-side area shown in FIG. 6) and an area where the blades 120 are not present (for example, the R-side area shown in FIG. 6). Since there are areas where the blades 120 are cut and areas where they are not cut when the pump impeller 100 is mechanically balanced, the mechanical balance of the pump impeller 100 is generally adjusted by adding a weight to the area where the blades 120 are cut and / or cutting a part of the area where the blades 120 are not cut.

[0033] In the pump impeller 100 according to the first embodiment of the present invention, as shown in FIG. 6, there are areas where the blades 120 are cut (e.g., L-side areas) and areas where they are not cut (e.g., R-side areas), but a groove 130 is formed on the side of the main plate 110 in the L-side area.

[0034] That is, the pump impeller 100 is set so that the mechanical balance of the pump impeller 100 is achieved in a state in which the side surface of the main plate 110 is already cut by the amount of the grooves 130. When the side surface of the main plate 110 is cut along the cutting lines 111 from this state, there are areas where the blades 120 are cut and areas where they are not, so the mechanical balance of the pump impeller 100 is lost, but the amount of the side surface of the main plate 110 that needs to be cut is reduced by the amount of the grooves 130 where the side surface has already been cut.

[0035] That is, the mechanical balance of the pump impeller 100 is less disrupted than when the grooves 130 are not formed on the side surface of the main plate 110. As a result, in order to adjust the mechanical balance of the pump impeller 100, it is only necessary to add a weight to the region where the blades 120 have been cut (for example, the L-side region) and / or to cut a portion of the region where the blades 120 have not been cut (for example, the R-side region), and the amount of time required for the adjustment can be reduced.

[0036] Further, when explaining the mechanical balance of the pump impeller 100 in detail, it can also be considered as shown in Fig. 7, for example. Fig. 7 is a diagram for explaining the mechanical balance of the pump impeller 100 according to the first embodiment of the present invention, separating the main plate 110 and the blades 120.

[0037] 7(A), the side surface (outer diameter) of the main plate 110 is cut along the cutting line 111, and at the same time, the area where the groove 130 is formed is also cut. At this time, the R-side area of the main plate 110 is cut more than the L-side area because the L-side area has the groove 130 formed in advance, and therefore the center of gravity of the main plate 110 moves toward the L-side area.

[0038] 7(B), the tip of blade 120 is cut along cutting line 111. At this time, the tip of the L-side region of blade 120 is cut, and other portions (such as the R-side region and central portion) are not cut, so the center of gravity of blade 120 moves toward the R-side region.

[0039] In this way, when the pump impeller 100 is used by cutting the outer diameter to obtain the desired head and usage, the centers of gravity of the main plate 110 and the blades 120 move in approximately opposite directions, and the pump impeller 100 as a whole is formed so as not to lose (significantly) its mechanical balance. As a result, as described above, the work time spent on adjusting the mechanical balance of the pump impeller 100 can be shortened.

[0040] As described above, according to the pump impeller 100 according to the first embodiment of the present invention, the main plate 110 has grooves 130 formed in at least a portion of the side surface that forms the outer periphery of the main plate 110, for example, near the tips 123 of the blades 120. Even when machining the pump impeller 100 to obtain a desired head or flow rate, the side surface of the main plate 110 that includes the area where the grooves 130 are formed is cut, so that the loss of mechanical balance is small, and appropriate balance adjustment can be made thereafter.

[0041] In this embodiment, the groove 130 is formed on the side surface of the main plate 110 in a range including the tip 123 of the blade 120, which is the maximum outer diameter portion of the blade 120, but this is not limited to this. For example, the groove 130 may be formed in a range that does not include the tip 123 of the blade 120, and multiple grooves 130 may be formed.

[0042] Fig. 8 is a diagram showing an example of a pump impeller 100 according to the first embodiment of the present invention, in which grooves 131 are formed in an area that does not include the tips 123 of the blades 120. As shown in Fig. 8, grooves 131 are formed on the side surface of the main plate 110, not including the tips 123 of the blades 120, but only within a predetermined range (for example, about 45° from the tips 123) along the side surface of the main plate 110 from the tips 123 of the blades 120 to the side on which the blades 120 are formed.

[0043] Fig. 9 is a diagram showing an example in which a plurality of grooves 132 are formed in the pump impeller 100 according to the first embodiment of the present invention. As shown in Fig. 9, the grooves 131 are formed on the side surface of the main plate 110, not including the tips 123 of the blades 120, but only within a predetermined range (within 90° from the tips 123) along the side surface of the main plate 110 on both sides of the tips 123 of the blades 120.

[0044] 8 and 9, by forming grooves 131, 132 in the side surface of the main plate 110, the pump impeller 100 is set to be mechanically balanced before the side surface of the main plate 110 is ground, with the side surface already ground away by the amount of grooves 131, 132. When the outer diameter of the main plate 110 is ground away from this state, the mechanical balance is only slightly disrupted. As a result, in order to adjust the mechanical balance of the pump impeller 100, it is only necessary to add weights to the areas where the blades 120 have been ground away and / or to ground away portions of the areas where the blades 120 have not been ground away, and this reduces the amount of work time required for the adjustment.

[0045] Second Embodiment Next, a second embodiment of the present invention will be described using a closed-type impeller as an example. The pump impeller according to this embodiment is a closed-type impeller that has side plates, unlike the pump impeller 100 according to the first embodiment of the present invention, and the blades are covered by the main plate and side plates. In this embodiment, descriptions of matters common to the first embodiment of the present invention will be omitted or simplified, and the following will mainly describe the features that are different between the open-type impeller and the closed-type impeller.

[0046] Fig. 10 is an external perspective view showing the configuration of a pump impeller 200 according to a second embodiment of the present invention. As shown in Fig. 10, the pump impeller 200 is a so-called closed-type impeller that includes a main plate 210, blades 220, and a side plate 230, and grooves 240 are formed in the side plate 230. Note that, for example, the pump impeller 200 is generally mechanically balanced, and in this case, it is considered to be mechanically balanced when grooves 240 are formed in at least a portion of the side surface that forms the outer periphery of the side plate 230.

[0047] The main plate 210 is substantially disk-shaped, and has a hub provided at the center of one surface in the axial direction.

[0048] The blades 220 are formed in a substantially spiral shape from the center of the main plate 210 and the side plate 230 toward the outer periphery on the other side of the main plate 210 opposite to the one side.

[0049] The side plate 230 has a substantially disk shape and is disposed so as to face the main plate 210 with the blades 220 interposed therebetween. Here, the outer diameter of the side plate 230 is larger than the outer diameter of the main plate 210, and therefore the tips 221 of the blades 220 reach the side surfaces that form the outer periphery of the side plate 230. In other words, the tips 221 of the blades 220 have the maximum outer diameter of the blades 220, and are the same as the outer diameter of the side plate 230.

[0050] Groove 240 is formed in at least a part of the side surface that forms the outer periphery of side plate 230. Groove 240 is preferably formed in the side surface of side plate 230 within a range of ±90° from the maximum outer diameter portion of blade 220, which is tip 221 of blade 220. Furthermore, as described in the first embodiment, groove 240 may be formed in a range that includes tip 221 of blade 220, or may be formed in a range that does not include tip 221 of blade 220, or multiple grooves may be formed.

[0051] When the pump impeller 200 is used after having its outer diameter cut, the side surfaces of the side plates 230, which have a larger outer diameter than the main plate 210, are cut. However, because the maximum outer diameter of the blades 220 is the same as the outer diameter of the side plates 230, the blades 220, together with the side surfaces of the side plates 230, are gradually cut from the tips 221 (maximum outer diameter portions) of the blades 220 toward the center. Here, since the ranges in which the grooves 240 are formed are also cut, as explained in the first embodiment, the mechanical balance of the pump impeller 200 is lost. However, the amount of cutting of the side surfaces of the side plates 230 is reduced by the amount of the grooves 240, which can be interpreted as having been cut in advance. In other words, the loss of mechanical balance is small, and the work time required for adjusting the mechanical balance can be shortened.

[0052] As described above, according to pump impeller 200 according to the second embodiment of the present invention, side plate 230 has grooves 240 formed in at least a portion of the side surface that forms the outer periphery of side plate 230, for example, near tips 221 of blades 220. Even when machining pump impeller 200 to obtain a desired head or usage, the side surface of side plate 230 including the area where grooves 240 are formed is cut, so that the loss of mechanical balance is small, and appropriate balance adjustment can be performed thereafter.

[0053] In this embodiment, the pump impeller 200 in which the side plate 230 has a larger outer diameter than the main plate 210 has been given as an example, but the present invention is not limited to this and may be a pump impeller in which the main plate 210 has a larger outer diameter than the side plate 230. In this case, the grooves 240 are formed in at least a part of the side surface that forms the outer periphery of the main plate 210, and the tips 221 of the blades 220 reach the side surface that forms the outer periphery of the main plate 210.

[0054] Here, when the pump impeller 200 is used after its outer diameter is machined, the side of the main plate 210, which has a larger outer diameter than the side plate 230, is machined, and the area in which the groove 240 is formed is also machined, thereby achieving the same effect as described above.

[0055] Furthermore, the main plate and the side plate may have the same outer diameter. Fig. 11 is an external perspective view showing the configuration of a pump impeller 300 in which the outer diameters of the main plate and side plate are the same. As shown in Fig. 11, the pump impeller 300 is a so-called closed-type impeller that includes a main plate 310, blades 320, and side plate 330. The main plate 310 has a groove 340 formed therein, and the side plate 330 has a groove 350 formed therein. Note that, for example, the pump impeller 300 is generally mechanically balanced, and in this case, it is considered to be mechanically balanced when the groove 340 is formed in at least a portion of the side surface that forms the outer periphery of the main plate 310, and the groove 350 is formed in at least a portion of the side surface that forms the outer periphery of the side plate 330.

[0056] As described in the first embodiment, the blades 320 are formed in a substantially spiral shape from the center toward the outer periphery of the main plate 310 and the side plate 330. Here, since the outer diameters of the main plate 310 and the side plate 330 are the same, the tips 321 of the blades 320 reach the side surfaces that form the outer peripheries of the main plate 310 and the side plate 330. In other words, the tip 321 of the blade 320 is the maximum outer diameter of the blade 320, and is the same as the outer diameters of the main plate 310 and the side plate 330.

[0057] When the pump impeller 300 is used after being machined to remove its outer diameter, the side surfaces of the main plate 310 and the side plate 330, which have the same outer diameter, are machined, and because the maximum outer diameter of the blade 320 matches the outer diameter of the main plate 310 and the side plate 330, the blade 320, along with the side surfaces of the main plate 310 and the side plate 330, is gradually machined from the tip 321 (maximum outer diameter portion) of the blade 320 toward the center. Here, since the areas where the grooves 340 and 350 are formed are also machined, as described in the first embodiment, the mechanical balance of the pump impeller 300 is lost. However, the amount of machined-off of the side surfaces of the main plate 310 and the side plate 330 is reduced by the amount of the grooves 340 and 350, which can be interpreted as having been machined in advance. In other words, the loss of mechanical balance is small, and the work time required for adjustment can be shortened.

[0058] In this way, even in the pump impeller 300 in which the main plate 310 and the side plate 330 have the same outer diameter, by forming the grooves 340, 350 on the respective side surfaces, the same effects as those described above can be obtained.

[0059] The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The elements of the embodiments, as well as their arrangement, materials, conditions, shapes, sizes, etc., are not limited to those illustrated and can be modified as appropriate. Furthermore, configurations shown in different embodiments can be partially substituted or combined with each other. [Explanation of symbols]

[0060] 100, 200, 300... Pump impeller, 110, 210, 310... Main plate, 111... Cutting line, 120, 220, 320... Blade, 121... Pressure surface, 122... Negative pressure surface, 123, 221, 321... Tip, 130, 131, 132, 240, 340, 350... Groove, 230, 330... Side plate

Claims

1. a main plate having a substantially disk shape and a hub provided at the center of one surface side in the axial direction; one blade formed in a substantially spiral shape from the center of the main plate toward the outer periphery on the other side of the main plate opposite to the one side, A groove is formed in at least a part of a side surface forming an outer periphery of the main plate, the groove is formed in the side surface within a range of ±90° from a maximum outer diameter portion of the blade, which is the tip position of the one blade, and is formed larger in a region on the side where the blade is formed in a substantially spiral shape with respect to the maximum outer diameter portion of the blade, than in a region on the opposite side. Pump impeller.

2. a main plate having a substantially disk shape and a hub provided at the center of one surface side in the axial direction; one blade formed in a substantially spiral shape from a center of the main plate toward an outer periphery on another surface side of the main plate opposite to the one surface side; a side plate having a substantially disk shape and arranged to face the main plate with the one blade interposed therebetween, A groove is formed in at least a part of at least one of the side surfaces that form the outer periphery of the main plate and the side plate, the groove is formed in the side surface within a range of ±90° from a maximum outer diameter portion of the blade, which is the tip position of the one blade, and is formed larger in a region on the side where the blade is formed in a substantially spiral shape with respect to the maximum outer diameter portion of the blade, than in a region on the opposite side. Pump impeller.

3. The grooves are formed on the side surfaces of the main plate and the side plate that have larger outer diameters. The pump impeller according to claim 2 .

4. In the side surface, the groove is formed in a range including a maximum outer diameter portion of the blade, which is a tip position of the one blade.

3. The pump impeller according to claim 1 or 2.

5. A motor; a rotation shaft that rotates when the motor is driven; and the pump impeller according to claim 1 or 2, which rotates in association with the rotation of the rotary shaft to generate a flow from the suction port toward the discharge port. pump.

6. A pump impeller comprising: a main plate having a substantially disk shape and a hub provided at the center of one axial surface side; and a blade formed in a substantially spiral shape from the center of the main plate toward the outer periphery on the other axial surface side of the main plate opposite to the one axial surface side, and a groove formed in at least a part of the side surface forming the outer periphery of the main plate, the groove is formed on the side surface within a range of ±90° from a maximum outer diameter portion of the blade, which is the tip position of the one blade, and is formed larger in an area on the side where the blade is formed in a substantially spiral shape with respect to the maximum outer diameter portion of the blade, than in an area on the opposite side; In the side surface, a side surface of the main plate is cut from a maximum outer diameter portion of the blade, which is a tip position of the one blade, together with the blade, Furthermore, at least a part of the pump impeller is removed or a weight is added. How to balance a pump impeller.

7. A pump impeller comprising: a main plate having a substantially disk shape and a hub provided at the center of one axial surface side; one blade formed in a substantially spiral shape from the center of the main plate toward the outer periphery on the other axial surface side of the main plate opposite to the one axial surface side; and a side plate having a substantially disk shape and arranged to face the main plate via the one blade, wherein a groove is formed in at least a part of at least one of the side surfaces forming the outer periphery of the main plate and the side plate, the groove is formed on the side surface within a range of ±90° from a maximum outer diameter portion of the blade, which is the tip position of the one blade, and is formed larger in an area on the side where the blade is formed in a substantially spiral shape with respect to the maximum outer diameter portion of the blade, than in an area on the opposite side; In the side surface, a side surface of at least one of the main plate and the side plate is cut from a maximum outer diameter portion of the blade, which is a tip position of the one blade, together with the blade, Furthermore, at least a part of the pump impeller is removed or a weight is added. How to balance a pump impeller.

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