JP7737082B2 - Pump impeller - Google Patents

Description

The present invention relates to a pump impeller.

Conventionally, impellers used in submersible pumps are known.

For example, Patent Document 1 discloses technology related to an impeller that prevents deformation of rubber or resin blades due to pressure from a fluid when the impeller rotates. Specifically, the impeller is configured with metal reinforcing parts embedded inside the plate-shaped part and blade parts.

JP 2017-210937 A

However, even with the impeller disclosed in Patent Document 1, wear is unavoidable due to sand and other contaminants contained in the fluid that strikes the impeller (particularly the blades) as the impeller rotates.

For example, if the impeller blades become worn to the point where they can no longer perform their intended function, there is concern that this could lead to a decline in pump performance, so it is advisable to inspect and replace the impeller before it reaches that point.

The present invention aims to provide a pump impeller that makes it easy to determine the degree of wear on the impeller.

One aspect of the present invention relates to a pump impeller for use in a submersible pump. The pump impeller is formed from at least a primary member and a secondary member configured to cover the primary member. The primary member includes a substantially disk-shaped plate portion and vane portions formed on one side of the plate portion to correspond to the blades of the pump impeller. The primary member and secondary member are made of different resin materials.

In the above aspect, at least a portion of the blades of the pump impeller formed from the primary member and at least a portion of the blades formed from the secondary member so as to cover the blades may be configured in different colors.

In the above aspect, at least a portion of the blades of the pump impeller that are formed of a secondary member to cover the vane portion may be transparent.

In the above aspect, the wing portion may include a marking portion having a first height on at least a portion of the wing portion.

In the above aspect, the secondary member may be configured to cover the side wall portion of the marker portion facing the rotational direction of the pump impeller and the side wall portion facing away from the rotational direction with approximately the same thickness.

In the above aspect, the secondary member may be configured to cover the side wall portion of the marker portion facing the rotational direction of the pump impeller with a thickness greater than the side wall portion facing the opposite rotational direction.

In the above aspect, the secondary member may be configured to cover the tip portion of the sign with a thickness greater than that of one side of the plate-shaped portion.

In the above aspect, the blade portion may include a rib portion having a second height that is smaller than the first height of the blade portion.

In the above aspect, the primary member may be made of a resin material, and the secondary member may be made of a resin material that is softer than the primary member.

The present invention provides a pump impeller that allows the degree of wear on the impeller to be easily determined.

1 is a perspective view showing the appearance of a pump impeller 10 according to an embodiment of the present invention. 1 is a perspective view showing the appearance of a primary member 100 constituting a pump impeller 10 according to an embodiment of the present invention. 1 is a perspective view showing a state in which a primary member 100 is disposed inside a pump impeller 10 according to an embodiment of the present invention. 3 的截面图，用于更具体地说明在图10中的带部120(标记部121)在图3中的初始部件100的带部120(标记部121)在图3中的峻体。 FIG. 3 is an enlarged view of part E in Figure 3, for more specifically illustrating the vane portion 120 (mark portion 121) in the primary member 100 in the blade 12 in the pump impeller 10 according to one embodiment of the present invention. 10 is a diagram showing another specific example in which the vane portion 120 (mark portion 121) of the primary member 100 is arranged inside the blade 12 of the pump impeller 10 according to one embodiment of the present invention. FIG. 10 is a diagram showing another specific example in which the vane portion 120 (mark portion 121) of the primary member 100 is arranged inside the blade 12 of the pump impeller 10 according to one embodiment of the present invention. FIG. 1 is a perspective view showing the appearance of a primary member 200 constituting a pump impeller 10 according to an embodiment of the present invention. FIG. 1 is a perspective view showing the appearance of a primary member 300 constituting a pump impeller 10 according to an embodiment of the present invention. FIG. FIG. 9 is an enlarged view showing details of a blade portion 320 in the primary member 300 shown in FIG. 8 . FIG. 2 is a perspective view showing the appearance of a primary member 400 constituting the pump impeller 10 according to one embodiment of the present invention.

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

<One embodiment>
[Pump impeller overview]
Figure 1 is a perspective view showing the appearance of a pump impeller 10 according to one embodiment of the present invention. As shown in Figure 1, the pump impeller 10 includes a main plate (disk portion) 11 and eight blades 12 on one side of the main plate 11, and is used in a submersible pump. The main plate 11 is formed with a bearing portion 13 having a through hole in which a rotating shaft that rotates the pump impeller 10 is installed.

The pump impeller 10 is formed of at least a primary member and a secondary member configured to cover the primary member, and it can be seen from the exterior of the pump impeller 10 that a portion of the primary member is exposed.

The pump impeller 10 has exposed portions 14 where the primary member is exposed between each of the eight blades 12. That is, on one side of the main plate (disk portion) 11 of the pump impeller 10 where the eight blades 12 are arranged, there are exposed portions 14 of the primary member that are not covered by the secondary member between each of the eight blades 12.

Furthermore, on the other side of the main plate (disk portion) 11, at a position corresponding to the exposed portion 14 of the primary member on that side, there is an exposed portion of the primary member that is not covered by the secondary member, just like the exposed portion 14.

In the bearing portion 13 of the pump impeller 10, the inner wall surface of the through hole in which the rotating shaft is placed, where the rotating shaft abuts, is not covered by the secondary member, and the primary member is exposed. In other words, when the rotating shaft is placed in the through hole of the bearing portion 13, the rotating shaft abuts against the primary member.

[Configuration of primary member in pump impeller]
2 is a perspective view showing the appearance of a primary member 100 constituting a pump impeller 10 according to one embodiment of the present invention. As shown in FIG. 2, the primary member 100 includes a plate-shaped portion 110, eight blade portions 120, a bearing portion 130, a plurality of protrusions 140, and a plurality of through holes 150, and is disposed inside the pump impeller 10 as a core material.

The plate-shaped portion 110 is approximately disk-shaped and is primarily disposed inside the main plate (disk portion) 11 of the pump impeller 10.

The eight vane portions 120 are formed on one side of the plate-shaped portion 110 so as to be positioned internally in correspondence with the eight blades 12 of the pump impeller 10. Each of the eight vane portions 120 includes a marking portion 121 and a rib portion 122.

The sign portion 121 is formed on the outer edge side of the approximately disk-shaped plate portion 110 of the blade portion 120. For example, here, the sign portion 121 is formed in an area of the blade portion 120 that is approximately 1/4 to 1/3 of the way from the outer edge of the plate portion 110.

The vane portion 120 is configured inside the blade 12 of the pump impeller 10 by being covered by a secondary member, but as the pump impeller 10 is used and the secondary member of the blade 12 gradually wears, the indicator portion 121 of the vane portion 120 becomes visible on the surface. In other words, the indicator portion 121 serves as an indicator for determining the degree of wear of the secondary member of the blade 12. Details of the indicator function will be described later.

The rib portion 122 is formed in an area of the blade portion 120 other than the marked portion 121. The height (second height) of the rib portion 122 may be smaller than the height (first height) of the marked portion 121. This makes it difficult for the rib portion 122 to appear on the surface even if the secondary component of the blade 12 gradually wears away.

As long as the indicator portion 121 of the vane portion 120 is formed to fulfill the indicator function, the shape of the eight vane portions 120 (the indicator portion 121 and the rib portion 122) may be made larger, smaller, thicker, or thinner, taking into consideration the strength required of the eight blades 12 of the pump impeller 10. Furthermore, the shape of the eight vane portions 120 (the indicator portion 121 and the rib portion 122) may also be such that the height protruding from one side of the plate-like portion 110 is made larger or smaller, and the height may even be different between the center side and the outer edge side of the plate-like portion 110.

The bearing portion 130 has a through-hole formed in the center of the plate-shaped portion 110, through which the rotating shaft passes. The shape of the through-hole may be, for example, circular, or may be a so-called D-cut shape in which at least part of the circle is made straight. In other words, if the shape of the through-hole is D-cut, the rotating shaft will also be a D-cut shaft with a corresponding D-cut.

As described above, in the pump impeller 10, the inner wall of the through-hole in which the rotating shaft is disposed, against which the rotating shaft abuts, is not covered by the secondary member, and the primary member 100 is exposed. In other words, when the pump impeller 10 is in use, the rotating shaft rotates, and a large torque is transmitted to the primary member 100, which abuts directly against it. In this case, if the through-hole is D-cut and a D-cut shaft is used for the rotating shaft, the pump impeller 10 and the rotating shaft can be firmly fastened together, preventing freewheeling and reducing wear on the bearing portion 130 in the primary member 100.

The multiple protrusions 140 are formed to protrude from one side and the other side of the plate-shaped portion 110. For example, on one side of the plate-shaped portion 110, 16 protrusions 140 are formed between the eight blade portions 120, two near the outer edge of the plate-shaped portion 110 (outer region) and two in the intermediate region between the bearing portion 130 and the outer edge of the plate-shaped portion 110. On the other side of the plate-shaped portion 110, the multiple protrusions 140 are formed at positions corresponding to the positions of the multiple protrusions 140 formed on one side of the plate-shaped portion 110.

Here, the intermediate region and outer region refer to the intermediate region and outer region of the plate-shaped portion 110 when the distance from the outer periphery of the bearing portion 130 to the outer edge of the plate-shaped portion 110 is divided into thirds, resulting in an inner region (bearing portion 130 side), an intermediate region, and an outer region (outer edge side of the plate-shaped portion 110).

The 16 protrusions 140 are provided to secure (align) the primary member 100 to the mold used to mold the pump impeller 10 when producing the pump impeller 10. Specifically, the primary member 100 is inserted as the core material of the pump impeller 10 into the mold used to mold the pump impeller 10, and then the secondary member is filled in to produce the pump impeller 10. At this time, the bearing portion 130 of the primary member 100 is fitted into the mold at a position corresponding to the rotation axis, and the 16 protrusions 140 of the primary member 100 abut against the interior of the mold, securing the primary member 100 to the mold.

The multiple through holes 150 are formed so as to penetrate from one side of the plate-shaped portion 110 to the other side. For example, a total of 12 through holes 150 are formed between the eight blade portions 120, one on each side in the outer region of the plate-shaped portion 110, and four near the outer periphery (inner region) of the bearing portion 130.

[Indicator function]
3 is a perspective view showing the primary member 100 disposed inside the pump impeller 10 according to one embodiment of the present invention. As shown in FIG. 3, the primary member 100 is disposed inside the pump impeller 10 as a core material of the pump impeller 10.

The pump impeller 10 rotates in the direction shown in Figure 3 as a result of the rotation of the rotating shaft disposed in the through-hole of the bearing portion 13.

As the pump impeller 10 rotates, sand and other impurities contained in the fluid that hits the pump impeller 10 cause the pump impeller 10 to wear down. In other words, as the secondary member, which is configured to cover the primary member 100, gradually wears down, the primary member 100 begins to appear on the surface.

When the pump impeller 10 rotates in the direction shown in Figure 3, the blades 12 of the pump impeller 10 are subjected to a large amount of pressure from the fluid. In particular, the pressure received from the fluid on the outer edge of the main plate 11, part of the side wall portion of the blade 12 facing the direction of rotation, is thought to be greater than in other areas, and sand and other impurities contained in the fluid collide with this portion, causing severe wear on the secondary components in that area.

Figure 4 is an enlarged view of portion E shown in Figure 3 to more specifically explain how the vane portion 120 (marked portion 121) of the primary member 100 is arranged inside the blade 12 of a pump impeller 10 according to one embodiment of the present invention. As shown in Figure 4, the marked portion 121 of the primary member 100 is arranged inside the blade 12 when viewed from the outer edge side of the main plate 11.

A vane portion 120 is disposed inside the blade 12, and a marking portion 121 is disposed on the outer edge of the approximately disk-shaped plate portion 110 of the vane portion 120. As described above, as the pump impeller 10 rotates in the rotational direction, the secondary member of the side wall portion 12A on the rotational side of the blade 12 gradually wears away, and the marking portion 121 appears on the surface.

The primary member 100 and secondary member are configured to be visually identifiable, so that it can be seen when the secondary member wears away from the side wall portion 12A and the marking portion 121 of the primary member 100 appears on the surface.

The primary member 100 and secondary member may be constructed in different colors; for example, the primary member 100 may be constructed in black and the secondary member in orange. Furthermore, the colors of each member are not limited to these; the primary member 100 may be constructed in gray, etc., and the secondary member in red, etc.

The secondary component may also be transparent. By making the secondary component transparent, the primary component 100 (label 121) placed inside can be seen, making it possible to grasp the extent to which the primary component 100 (label 121) has appeared on the surface.

In the example shown in Figure 4, the marked portion 121 is located in the center of the blade 12. In other words, the secondary member is configured to cover the side wall portion (pressure surface) on the rotational direction side of the pump impeller 10 and the side wall portion (negative pressure surface) on the opposite side of the rotational direction with approximately the same thickness for the marked portion 121. By locating the blade portion 120 (including the marked portion 121) of the primary member 100 as a core material in the center of the blade 12, manufacturing is easier in terms of the filling property and hardening time of the secondary member during the manufacturing process.

Figure 5 is a diagram showing another specific example in which the vane portion 120 (marked portion 121) of the primary member 100 is disposed inside the blade 12 of a pump impeller 10 according to one embodiment of the present invention. As shown in Figure 5, the marked portion 121 of the primary member 100 is disposed inside the blade 12 as viewed from the outer edge side of the main plate 11.

In the example shown in Figure 5, the marking portion 121 is positioned away from the center of the blade 12 toward the opposite side of the rotation direction of the pump impeller 10. In other words, the secondary member is configured to cover the side wall portion 12B of the marking portion 121 on the rotation direction side of the pump impeller 10 with a thickness greater than that of the side wall portion on the opposite side of the rotation direction.

In this way, by making the side wall portion 12B, which is made up of a secondary member, thicker, the secondary member of the side wall portion 12B gradually wears away, and it takes longer for the marker portion 121 to appear on the surface, compared to the example shown in Figure 4. In other words, the time it takes for the secondary member to gradually wear away and for the marker portion 121 to appear on the surface can be adjusted depending on the position of the marker portion 121 located inside the blade 12 (the thickness of the secondary member covering the marker portion 121).

Here, the side wall portion 12B made up of the secondary member has a large thickness, but if it is desired to shorten the time it takes for the sign portion 121 to appear on the surface, it may be made thinner than the example shown in Figure 4.

Figure 6 is a diagram showing another specific example in which the vane portion 120 (marked portion 121) of the primary member 100 is arranged inside the blade 12 of a pump impeller 10 according to one embodiment of the present invention. As shown in Figure 6, the marked portion 121 of the primary member 100 is arranged inside the blade 12 as viewed from the outer edge side of the main plate 11.

In the example shown in Figure 6, the sign portion 121 is configured to have a smaller height than the examples shown in Figures 4 and 5. In other words, the secondary member is configured to cover the tip portion 12C of the sign portion 121 with a thickness greater than that of one side of the plate-like portion 110.

When the pump impeller 10 rotates, pressure from the fluid is exerted not only on the sidewall portion of the blade 12 in the direction of rotation, but also on the tip portion of the blade 12. Even at this tip portion, the secondary member gradually wears away, causing the marking portion 121 to appear on the surface.

In this way, by making the tip portion 12C, which is made up of a secondary member, thicker, the secondary member of the tip portion 12C gradually wears away, and it takes longer for the marker portion 121 to appear on the surface, compared to the examples shown in Figures 4 and 5. In other words, the time it takes for the secondary member to gradually wear away and for the marker portion 121 to appear on the surface can be adjusted depending on the shape of the marker portion 121 placed inside the blade 12 (the thickness of the secondary member covering the marker portion 121).

[Materials for primary and secondary components]
Regarding the material forming the pump impeller 10, the primary member 100 is preferably a hard resin material as the core material of the pump impeller 10. For example, the primary member 100 is made of a material having a predetermined flexural modulus (e.g., 8000 MPa or more depending on the shape of the impeller and the required performance), and specifically, the primary member 100 may be made of a modified PPE (m-PPE, modified polyphenylene ether) resin or PPS (polyphenylene sulfide), which may contain glass fiber, calcium carbonate, or the like.

The secondary member is made of a resin material that is softer than the primary member 100, and is preferably made of, for example, a soft ether-based urethane material that has excellent abrasion resistance and hydrolysis resistance.

In this way, by producing the primary component 100 from a hard resin material, the degree of freedom in the product shape of the pump impeller 10 is increased, and a mono-material structure can be achieved by not using a metal material as the core material. As a result, the pump impeller 10 can be easily thermally recycled and can be provided as an environmentally friendly product.

As described above, the pump impeller 10 according to one embodiment of the present invention is formed from a primary member 100 made of a hard resin material and a secondary member made of an ether-based urethane material that is softer than the primary member 100. The primary member 100 includes a substantially disk-shaped plate portion 110 and eight blade portions 120 formed on one side of the plate portion 110. The secondary member is configured to cover the primary member 100, and the primary member 100 and secondary member are configured to be visually distinguishable. As a result, as the pump impeller 10 rotates, sand and other impurities contained in the fluid that strikes the pump impeller 10 gradually wear away the secondary member, causing the marking portion 121 on the primary member 100 to appear on the surface. As a result, the degree of wear on the pump impeller 10 can be easily determined, allowing appropriate determination of when to inspect and replace the pump impeller 10.

In this embodiment, the blade portion 120 of the primary member 100 is configured such that the height (second height) of the rib portion 122 is smaller than the height (first height) of the sign portion 121, as shown in FIG. 2, but this is not limited to this. For example, the height (first height) of the sign portion 121 and the height (second height) of the rib portion 122 may be the same, so that there is no boundary between the sign portion 121 and the rib portion 122, and the entire portion, including the rib portion 122, is the sign portion 121.

In addition, in this embodiment, the height (first height) of the sign portion 121 and/or the height (second height) of the rib portion 122 are constant, but this is not limited to this. For example, they may be configured to gradually decrease from the outer edge toward the center of the approximately disk-shaped plate portion 110.

Furthermore, all or part of the rib portion 122 does not have to be formed so as to protrude from one side of the plate-shaped portion 110. For example, as long as the strength required for the eight blades 12 of the pump impeller 10 is met, the portion of the primary member 100 corresponding to the blades of the pump impeller (the plate-shaped portion 110) may be flat.

[Another specific example of primary member (1)]
In this embodiment, the marking portion 121 is formed only on the outer edge side of the substantially disk-shaped plate portion 110 of the blade portion 120, but this is not limited to this. Fig. 7 is a perspective view showing the appearance of the primary member 200 constituting the pump impeller 10 according to one embodiment of the present invention. As shown in Fig. 7, the primary member 200 differs from the primary member 100 shown in Fig. 2 in that each of the eight blade portions 220 includes two marking portions 221A, 221B and a rib portion 222.

The blade portion 220 has a marking portion 221A on the outer edge of the generally disc-shaped plate portion 110 of the blade portion 120, and also has a marking portion 221B on the central side. By forming marking portion 221B on the central side of the generally disc-shaped plate portion 110 of the blade portion 220, as the secondary member configured to cover marking portion 221B gradually wears away, marking portion 221B will appear on the surface. In other words, if the central side of the generally disc-shaped plate portion 110 of the blade portion 220 is severely worn away, the extent of that wear can be easily determined.

In this way, the markings may be formed not only near the outer region (the outer edge side of the plate-shaped portion 110) of the blade portion 120 (220), but also near the inner region (the side facing the bearing portion 130) or near the middle region.

Also, as shown in Figure 7, the protrusions 140 may be formed one between each of the eight blade portions 120, for a total of eight. In Figure 2, two protrusions 140 are formed between each of the eight blade portions 120, forming 16 protrusions 140, but this is not limited to this. The protrusions 140 are provided for fixing (aligning) to the mold, so as long as they can be stably fixed to the mold, it is sufficient that at least three protrusions 140 are formed.

On the other hand, depending on the material and shape of the primary member 100, the material of the secondary member, and the mold, many (more than 16) protrusions 140 may be formed to stably fix (align) the primary member 100 to the mold during the manufacturing process. For example, three or more protrusions 140 may be formed between each of the multiple wing portions 120 formed on the plate-like portion 110, or protrusions 140 may be formed in the inner region in addition to the middle and outer regions.

Furthermore, if a jig or the like is used as a method for inserting and fixing the primary member 100, which serves as the core material of the pump impeller 10, into the mold for molding the pump impeller 10, such a protrusion 140 does not need to be provided.

Also, as shown in FIG. 7, the through holes 150 may be formed one between each of the eight blade portions 120, for a total of eight. In FIG. 2, the through holes 150 are formed one between each of the eight blade portions 120 in the outer region, and four are formed along the outer periphery of the bearing portion 130 in the inner region, for a total of twelve through holes 150, but this is not limited to this. The through holes 150 are provided to ensure close contact between the primary member 100 and the secondary member, so the number, position, and size of the through holes may be set as appropriate as long as appropriate close contact between the primary member 100 and the secondary member can be ensured.

In this way, the number, position, and size of the protrusions 140 and through holes 150 may be set as appropriate. The primary member 100 is inserted into a mold for molding the pump impeller 10, and then the secondary member is filled in. However, when the secondary member is filled in, a large load is placed on the primary member 100 set in the mold. Therefore, from the perspective of preventing deformation of the primary member 100, it is preferable to form many protrusions 140. Furthermore, when the secondary member is filled in, it is expected that the secondary member will flow in a balanced manner onto one side and the other side of the plate-like portion 110 through the through holes 150.

[Another specific example of primary member (2)]
Fig. 8 is a perspective view showing the appearance of a primary member 300 constituting a pump impeller 10 according to one embodiment of the present invention. As shown in Fig. 8, the primary member 300 differs from the primary member 100 shown in Fig. 2 in that a marking portion 321 is formed in the center of each of the eight blade portions 320.

As shown in Figures 2 and 7, the blade portion 320 does not have a marking portion formed on the outer edge of the approximately disk-shaped plate portion 110, but rather has a marking portion 321 formed in the center of the blade portion 320. For example, the blade portion 320 has a marking portion 321 formed near the middle region, a rib portion 322A formed near the outer region (the outer edge side of the plate portion 110), and a rib portion 322B formed near the inner region (the bearing portion 130 side). As a result, as the secondary member configured to cover the marking portion 321 gradually wears, the marking portion 321 appears on the surface. In other words, if the blade portion 320 is severely worn from the center side of the approximately disk-shaped plate portion 110, the extent of the wear can be easily determined.

Figure 9 is an enlarged view showing details of the wing portion 320 of the primary member 300 shown in Figure 8. As shown in Figure 8, a marking portion 321 is formed in the center of the wing portion 320.

When the pump impeller rotates, a large amount of pressure from the fluid is applied to the blades 12 of the pump impeller 10. Depending on the environment and conditions in which the pump is used and the type and amount of foreign matter contained in the fluid, pressure is applied to the blades 12 from various directions, not just from the sidewall portion of the blade 12 facing in the direction of rotation and the outer edge of the main plate 11.

For example, in the region of the blade 12 facing the bearing 130, the secondary member (above the rib 322B) covering the vane 320 may gradually wear down, causing the marker 321 to appear on the surface. When this happens, the surface 321a of the marker 321 shown in Figure 9 that faces the bearing 130 may appear on the surface, making it easy to grasp the degree of wear on the pump impeller 10 and allowing appropriate determination of when to inspect and replace it.

[Another specific example of primary member (3)]
Fig. 10 is a perspective view showing the appearance of the primary member 400 constituting the pump impeller 10 according to one embodiment of the present invention. As shown in Fig. 10, the primary member 400 differs from the primary member 100 shown in Fig. 2 in that the eight blades 420 each have a marking portion 421 formed only on the outer edge side thereof.

As shown in Figures 2, 7, and 8, the blade portion 420 does not have a marking on the center side (inside) or near the center of the approximately disk-shaped plate portion 110 of the blade portion 420, but has a marking 421 formed only on the outer edge of the blade portion 320. For example, the blade portion 420 may not have a rib portion as shown in Figures 2, 7, and 8, or may have a rib portion formed only slightly around the periphery of the marking 421. This allows the marking 421 to appear on the surface as the secondary member configured to cover the marking 421 gradually wears away. In the case of blade 12, when wear is severe from the center side of the approximately disk-shaped plate portion 110 or when wear is severe on the outer edge side, the degree of wear can be easily determined. Furthermore, the configuration is simple.

In this embodiment, a pump impeller 10 having eight blades 12 has been described as an example, but this is not limited to this. For example, the pump impeller may have fewer than eight blades or nine or more blades.

The embodiments described above are intended to facilitate understanding of the present invention and are not intended to limit the scope of the present invention. The elements included in the embodiments, as well as their arrangement, materials, conditions, shape, size, 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.

10...Pump impeller, 11...Main plate (disk portion), 12...Blade, 13...Bearing portion, 14...Exposed portion, 100, 200, 300, 400...Primary member, 110...Plate portion, 120, 220, 320, 420...Blade portion, 121, 221A, 221B, 321, 321a, 421...Marking portion, 122, 222, 322A, 322B...Rib portion, 130...Bearing portion, 140...Protrusion portion, 150...Through hole, 12A, 12B...Side wall portion, 12C...Tip portion

Claims (9)

A pump impeller used in a submersible pump,
formed of at least a primary member and a secondary member configured to cover the primary member;
The primary member is
a substantially disk-shaped plate-like portion having a plurality of through holes;
a vane portion formed on one surface of the plate-shaped portion so as to correspond to the blade of the pump impeller,
The primary member and the secondary member are made of different resin materials,
The secondary member continuously covers the blade portion and the plate-like portion and fills the plurality of through holes in the plate-like portion .
Pump impeller. Among the blades of the pump impeller, at least a part of the vane portion formed by the primary member and at least a part of the vane portion formed by the secondary member so as to cover the vane portion are configured in different colors.
The pump impeller according to claim 1 . At least a portion of the blades of the pump impeller that is formed of the secondary member so as to cover the vane portion is transparent.
The pump impeller according to claim 2 . The wing portion includes a marking portion having a first height on at least a portion of the wing portion.
The pump impeller according to claim 1 . The secondary member is configured to cover, with approximately the same thickness, a side wall portion of the marker portion on a side facing the rotation direction of the pump impeller and a side wall portion on an opposite side to the rotation direction.
The pump impeller according to claim 4. the secondary member is configured to cover a side wall portion of the marking portion on a rotation direction side of the pump impeller with a thickness greater than that of a side wall portion on an opposite side to the rotation direction.
The pump impeller according to claim 4. The secondary member is configured to cover the tip portion of the sign portion with a thickness greater than that of one surface side of the plate-like portion.
The pump impeller according to claim 4. The blade portion includes a rib portion having a second height smaller than the first height of the blade portion.
The pump impeller according to claim 4. The secondary member is made of a resin material that is softer than the primary member.
The pump impeller according to claim 1 .