KR102553971B1 - Rotary vanes for drainage pumps and drainage pumps having the same - Google Patents

Abstract

[assignment]
A rotary blade for a drain pump capable of effectively increasing quietness and a drain pump having the same are provided.
[Solution]
The rotary blades 30 of the drainage pump 1 are provided below the water flow direction regulating portion 38 at the outer end 33c of the large-diameter blade 33 and the outer end 35c of the auxiliary blade 35. It has an intake regulating part (39). The water flow intake regulating portion 39 protrudes outward from the water flow direction regulating portion 38 in the radial direction and backward in the rotational direction. The water flow F2 passing near the lower part of the water flow direction regulating portion 38 of the large-diameter blade 33 is guided outward in the radial direction and rearward in the rotational direction by the water flow inlet regulating portion 39 .

Description

Rotary vanes for drainage pumps and drainage pumps having the same

The present invention relates to, for example, a drain pump used in an indoor unit of an air conditioner or the like, and a rotary blade for a drain pump included in the drain pump.

In the indoor unit of the air conditioner, moisture in the air is condensed and adheres to the heat exchanger during cooling operation. Moisture adhering to the heat exchanger turns into water droplets and falls into the drain pan. Then, the water accumulated in the drain pan (drain water) is discharged to the outside of the indoor unit by a drain pump. An example of a drainage pump used in such an air conditioner is disclosed in Patent Document 1.

Fig. 10 shows a rotary blade used in the drainage pump of Patent Document 1. 10(a) to (c) are a perspective view, a plan view, and a front view in which a part of this rotary blade is enlarged. The rotary blade 930 has a plurality of flat plate-shaped large-diameter blades 933 provided at equal angular intervals, and a plurality of flat-shaped auxiliary blades 935 provided between adjacent large-diameter blades 933. The large-diameter blade 933 and the auxiliary blade 935 are connected by an annular connecting portion 936 having an opening 937 at the center of each lower end.

At the outer end 933c of the large-diameter blade 933, a columnar water flow direction regulating portion 938 is provided. A water flow direction regulating portion 938 is similarly provided at the outer end portion 935c of the auxiliary blade 935. The rotary blade 930 regulates the flow of water by the water flow direction regulating part 938, and realizes high quietness.

Patent Document 1: Patent No. 6375285

When the rotary blade 930 rotates, the water that hits the webbed surface 933a facing forward in the rotational direction of the large-diameter blade 933 passes through the upper end 933b and the outer end 933c of the large-diameter blade 933 and passes through the large diameter blade 933. It rotates to the rear side of the wing 933. At this time, since water is mainly supplied from the upper end 933b to the rear side of the large-diameter wing 933, the negative pressure in the vicinity of the rear surface of the large-diameter wing 933 is greater in the area near the lower end than in the area near the upper end 933b. Therefore, the flow of water passing near the lower part (shown schematically by arrow f1 in Fig. 10) passing near the upper part of the outer end 933c of the large-diameter blade 933 (arrow f1 in Fig. 10) (shown schematically in f2)) is greatly pulled inward in the radial direction, and the water flow f1 and the water flow f2 may shift in the radial direction. As a result, on the webbed surface 935a of the auxiliary blade 935 immediately after the large-diameter blade 933, there is a difference in the position where water collides between the part near the upper end 935b and the part near the lower end, and vibration occurs. , which may cause noise.

Accordingly, an object of the present invention is to provide a rotary blade for a drain pump capable of effectively increasing quietness and a drain pump having the same.

In order to achieve the above object, a rotary blade for a drainage pump according to one aspect of the present invention includes a shaft portion, a plurality of large-diameter blades extending radially from the shaft portion, and a plurality of large-diameter blades extending at lower ends of the plurality of large-diameter blades. A rotary impeller for a drainage pump having a plurality of small-diameter impellers and an annular connecting portion connecting lower ends of the plurality of large-diameter impellers, provided below an outer end of the large-diameter impeller, It is characterized by having a water flow intake regulating portion protruding in at least one of the outer side in the radial direction and the rear side in the rotation direction from the upper portion.

In the present invention, it further has a plurality of auxiliary blades disposed between the plurality of large-diameter blades, provided below the outer end of the auxiliary blade, and at least one of the outer ends in the radial direction and rearward in the rotation direction than the top of the outer ends of the auxiliary blades. It is preferable to have a water flow inlet control portion protruding.

In the present invention, it is preferable that the water flow intake regulating portion is formed in an oval shape or an elliptical shape in a plan view.

In the present invention, it is preferable that the water flow intake regulating portion is formed in a wedge shape having an upper surface inclined upward from the front to the rear in the rotational direction.

In order to achieve the above object, a drain pump according to another aspect of the present invention is a drain pump having a housing having a suction pipe provided with a suction port facing downward, rotary blades accommodated in the housing, and a motor for rotating the rotary blades As, the rotary blade is a rotary blade for the drainage pump.

According to the present invention, the water flow intake regulating portion is provided below the outer end of the large-diameter blade and protrudes outward in the radial direction and rearward in the rotational direction from the top of the outer end. By doing so, the flow of water passing near the lower part of the outer end of the large-diameter blade is guided outward in the radial direction or rearward in the rotational direction by the water flow intake regulating portion. Therefore, it is possible to suppress the flow of water passing close to the lower part of the outer end of the large-diameter blade from entraining to the rear side of the large-diameter blade. Therefore, it is possible to suppress the occurrence of a difference in the state of water hitting the part near the upper end and the part near the lower end on the webbed surface immediately after the large-diameter blade, suppress noise caused by vibration, and effectively increase quietness. can

1 is a diagram showing a drain pump according to a first embodiment of the present invention;
Fig. 2 is a view showing rotary blades used in the drainage pump of Fig. 1;
3 is an enlarged view of a part of the rotary blade of FIG. 2;
Figure 4 is a graph showing the level of noise between the drain pump of Figure 1 and the conventional drain pump.
Fig. 5 is a diagram showing a configuration of a modified example of the rotary blade of Fig. 2;
Fig. 6 is a view showing the configuration of another modified example of the rotary blade of Fig. 2;
Fig. 7 is a diagram showing rotary blades included in a drainage pump according to a second embodiment of the present invention.
8 is an enlarged view of a part of the rotary blade of FIG. 7;
Fig. 9 is a diagram showing the configuration of a modified example of the rotary blade of Fig. 7;
10 is a view showing a rotary blade of a conventional drainage pump.

(First Example)

Hereinafter, the configuration of the drain pump according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 6 . As an example, the drainage pump of the present embodiment is for discharging drain water accumulated in a drain pan of an indoor unit of an air conditioner to the outside. Of course, the use of this drainage pump is not limited to drain water discharge, and it can be used for discharge or pumping of various liquids. The same applies to the drainage pump of the second embodiment described later.

1 is a diagram showing a drainage pump according to a first embodiment of the present invention. 1 is, specifically, a front view including a partial cross-sectional view of a lower portion of a drain pump cut along a plane passing through an axial line of a discharge pipe. FIG. 2 is a diagram showing rotary blades used in the drainage pump of FIG. 1 . FIG. 3 is an enlarged view of a part of the rotary blade of FIG. 2 . FIG. 4 is a graph showing noise levels of the drain pump of FIG. 1 and the conventional drain pump. 5 : is a figure which shows the structure of the modified example of the rotor blade of FIG. 6 : is a figure which shows the structure of another modified example of the rotor blade of FIG. 2, 3, 5 and (a) to (c) of FIG. 6 are a perspective view, a plan view and a front view in order.

As shown in FIG. 1 , the drain pump 1 of this embodiment includes a housing 10, a cover 20, a rotary blade 30 serving as a rotary blade for the drainage pump, and a motor 40. there is. In this embodiment, the housing 10, the cover 20 and the rotary blade 30 are made of synthetic resin.

The housing 10 has a body portion 11, a suction pipe 16, and a discharge pipe 18 integrally. The body portion 11 has a bottom wall portion 12 having an inverted truncated conical shape, and a peripheral wall portion 13 extending along the outer periphery of the bottom wall portion 12 . The suction pipe 16 extends downward from the center of the bottom wall portion 12 . At the lower end of the suction pipe 16, a suction port 17 facing downward is provided. The discharge pipe 18 extends from the circumferential wall portion 13 to the side (rightward direction in FIG. 1 ). At the front end of the discharge pipe 18, a discharge port 19 facing the side is provided. A discharge pipe inlet 15 serving as an inlet to the discharge pipe 18 is provided on the circumferential wall portion 13 of the body portion 11 .

The housing 10 has a space in which a rotary blade 30 described later is arranged, and the pump chamber 25 is formed (partitioned) by surrounding the space with a cover 20.

The cover 20 has a substantially cylindrical shape, and its lower end is engaged with the upper opening of the main body 11 of the housing 10, and is fixed and attached to the housing 10 by a snap fit mechanism (not shown). A bracket 22 is attached to the upper end of the cover 20 via a locking portion 21 . The bracket 22 is provided with an attachment portion 23 for attaching the drain pump 1 to other devices. A motor 40 for rotating the rotary blade 30 is housed in the cover 20 .

The rotary blade 30 is housed in the pump chamber 25 rotatably. As shown in Figs. 2 and 3, the rotary blade 30 includes a shaft portion 31, a plurality of large-diameter blades 33, a plurality of small-diameter blades 34, a plurality of auxiliary blades 35, , a connecting portion 36, a plurality of water flow direction regulating portions 38, and a plurality of water flow inflow regulating portions 39. The large-diameter blade 33, the small-diameter blade 34, and the auxiliary blade 35 are formed in a flat plate shape. In this embodiment, four large-diameter blades 33, small-diameter blades 34 and auxiliary blades 35 are provided. In addition, you may employ|adopt the structure which abbreviate|omitted the auxiliary blade 35. The rotary blade 30 is rotated counterclockwise around the shaft portion 31 in FIG. 2 (b).

The shaft portion 31 is formed in a cylindrical shape and passes through a through hole 24 provided in the center of the cover 20 . An attachment hole 32 is provided at the upper end of the shaft portion 31 . The attachment hole 32 is fitted with the drive shaft 41 of the motor 40 .

The plurality of large-diameter blades 33 extend radially (outward in the radial direction) from the outer circumferential surface of the shaft portion 31 . A plurality of large-diameter blades 33 are arranged at equal angular intervals (90 degree intervals in this embodiment) around the shaft portion 31.

The plurality of small-diameter blades 34 are connected in a row at a portion near the shaft portion 31 at the lower end of each large-diameter blade 33. The small-diameter blades 34 extend downward from the continuous portion with the large-diameter blades 33. A plurality of small-diameter blades 34 are inserted into the suction pipe 16 . The plurality of small-diameter blades 34 are arranged at equal angular intervals (90 degree intervals in this embodiment) around the shaft portion 31.

A plurality of auxiliary blades 35 are arranged on a connecting portion 36 described later. The auxiliary blade 35 is disposed in the middle of the large-diameter blades 33 adjacent to each other in the rotational direction. The auxiliary blades 35 extend radially from the inner periphery of the connecting portion 36 . The auxiliary blade 35 is not connected to the shaft portion 31 .

The connecting portion 36 has an inverted truncated cone shape and is formed in an annular shape with an opening 37 provided in the center. The connecting portion 36 connects the lower ends of each large-diameter blade 33 and each auxiliary blade 35 to each other.

The water flow direction regulating portion 38 is formed in a columnar shape with an oval shape in plan view (cross-sectional shape). In this embodiment, the shape of the water flow direction regulating portion 38 in plan view is an oval shape in which the diameter near the front in the rotational direction is larger than the diameter near the rear. The water flow direction regulating portion 38 extends upward and downward as an end portion (outer end portion 33c) of the large-diameter blade 33 and the auxiliary blade 35 near the outer side in the radial direction. The upper end of the water flow direction regulating portion 38 provided on the large-diameter blade 33 protrudes upward from the upper end 33b of the large-diameter blade 33 . By providing the water flow direction regulating portion 38 on the large-diameter blade 33, when the rotor blade 30 is rotated, it passes through the upper end portion 33b near the corner portion where the upper end portion 33b and the outer end portion 33c intersect. A three-dimensional collision between the flow of water passing through the outer end portion 33c is suppressed. This makes the flow of water in the vicinity of the corner portion two-dimensional, reduces generation of turbulence, and suppresses mixing of air bubbles in the flow of water. The water flow direction regulating portion 38 provided on the auxiliary blade 35 also has the same action.

The water flow intake regulating portion 39 has an oval shape in plan view and is formed in a substantially wedge shape with an upper surface 39a inclined upward from the front to the rear in the rotational direction. The water flow intake regulating portion 39 is integrally provided under the water flow direction regulating portion 38 provided on the large-diameter blade 33 and the auxiliary blade 35 .

In this embodiment, the planar view shape of the water flow inlet regulating portion 39 protrudes outward in the radial direction and backward in the rotational direction from the planar view shape of the water flow direction regulating portion 38, and forward in the rotational direction. Oblong, with diameter near posterior greater than diameter near posterior. That is, the water flow intake regulating portion 39 is radially outward and rotated from the upper portion of the water flow direction regulating portion 38, which is the outer end 33c of the large-diameter blade 33 and the outer end 35c of the auxiliary blade 35. protruding in the rearward direction. In addition, other shapes such as elliptical, rectangular, triangular, etc. may be sufficient as the plan view shape of the water flow inlet regulating part 39, as long as it does not contradict the objective of this invention.

Next, the action of the water flow intake regulating portion 39 provided on the large-diameter blade 33 will be described with reference to FIG. 3 . In addition, the water flow intake regulating portion 39 provided on the auxiliary blade 35 also has the same function.

When the rotary blade 30 rotates, water passes through the suction pipe 16 from the suction port 17 and is sucked up into the pump chamber 25 . Then, in the pump chamber 25, the water that hits the webbing surface 33a facing forward in the rotational direction of the large-diameter blade 33 partially passes through the upper end 33b of the large-diameter blade 33 and It flows to the rear side, and the other part passes through the outer end 33c of the large-diameter wing 33 and flows to the rear side of the large-diameter wing 33. At this time, since water is mainly supplied from the upper end portion 33b to the rear side of the large-diameter blade 33, the negative pressure of the portion near the lower end increases in the vicinity of the rear surface of the large-diameter blade 33 compared to the portion near the upper end.

Here, attention is paid to the flow of water passing through the outer end portion 33c of the large-diameter blade 33. A flow of water (shown schematically by an arrow f2 in FIG. 3) passing near the lower portion of the outer end portion 33c gradually goes upward along the upper surface 39a of the water flow intake regulating portion 39. Therefore, the supply of water to the vicinity of the side surface 39b of the water flow intake regulating portion 39 is reduced due to the flow F2 along the upper surface 39a, and negative pressure is generated in the vicinity of the side surface 39b. As a result, the water flow F2 along the upper surface 39a is pulled from the middle of the upper surface 39a toward the side surface 39b side.

Further, since the water flow inflow regulating portion 39 has an oval shape, a vortex of water separated from the side surface 39b (separation flow) is generated in a portion near the rear of the side surface 39b. Therefore, after the water flow F2 is drawn from the upper surface 39a to the side surface 39b side, it bulges outward so as to bypass the separation flow.

In this way, the water flow intake regulating portion 39 expands the water flow F2 passing near the lower portion of the water flow direction regulating portion 38, which is the outer end portion 33c of the large-diameter blade 33, to the outside, thereby expanding the radial direction Regulate entry into the room. As a result, the flow of water passing near the upper portion of the water flow direction regulating portion 38 (shown schematically by arrow F1 in FIG. 3) and the flow F2 passing near the lower portion, the large-diameter blade 33 It is possible to suppress displacement in the radial direction on the webbed surface 35a of the auxiliary blade 35 immediately after the .

The inventors of the present invention use the drainage pump 1 of this embodiment (first embodiment) and the drainage pump having a conventional rotary blade shown in FIG. 10 (conventional) to discharge drain water. ) and the noise level were verified. The verification result is shown in FIG. 4 . As the graph of FIG. 4 shows, the drain pump of the first embodiment has less noise and improved quietness than the conventional drain pump regardless of the head.

As a result of the above, the rotary blade 30 of the drainage pump 1 of the present embodiment has a water flow direction regulating portion ( 38), and has a water flow intake regulating portion 39 protruding outward from the water flow direction regulating portion 38 in the radial direction and rearward in the rotational direction. By doing in this way, the water flow F2 passing near the bottom of the water flow direction regulating portion 38 is guided outward in the radial direction and backward in the rotational direction by the water flow inlet regulating portion 39 . Therefore, it is possible to suppress the water flow F2 passing near the lower portion of the water flow direction regulating portion 38 from entraining greatly to the rear side of the large-diameter blade 33 and the rear side of the auxiliary blade 35. Therefore, on the webbed surface 35a of the auxiliary blade 35 immediately after the large-diameter blade 33, it is possible to suppress a difference in the state of water hitting the part near the upper end and the part near the lower end. The same applies to the webbed surface 33a of the large-diameter blade 33 immediately after the auxiliary blade 35. Therefore, noise caused by vibration can be suppressed and quietness can be effectively improved.

5 shows a rotary blade 30A, which is a modified example of the rotary blade 30. In the rotary blade 30A of this modified example, instead of the water flow direction regulating portion 38, the upper end is the same height as the large-diameter blade 33 and the auxiliary blade 35 (that is, the upper end is the large-diameter blade 33). It has the same structure as the rotary blade 30 described above except for having a columnar water flow direction regulating portion 38A (which does not protrude upward from the auxiliary blade 35).

In addition, the rotary blade 30B which is another modified example of the rotary blade 30 is shown in FIG. The rotor blade 30B of this other modified example has the same configuration as the rotor blade 30 described above except for omitting the water flow direction regulating portion 38 .

Also in the rotor blade 30A and the rotor blade 30B of these modifications, the same effect as the rotor blade 30 described above is achieved.

(Second embodiment)

Hereinafter, the configuration of the rotary blade of the drainage pump according to the second embodiment of the present invention will be described with reference to FIGS. 7 to 9 .

Fig. 7 is a diagram showing rotary blades included in the drainage pump according to the second embodiment of the present invention. Fig. 8 is an enlarged view of a part of the rotary blade of Fig. 7; 9 : is a figure which shows the structure of the modified example of the rotor blade of FIG. 7-9 (a) - (c) are a perspective view, a top view, and a front view in order. In the description of the present embodiment, the same reference numerals are assigned to the same configurations as those of the first embodiment described above, and descriptions are omitted.

The drainage pump (not shown) of the present embodiment, like the drainage pump 1 of the first embodiment, includes a housing 10, a cover 20, a rotary blade 130 as a rotary blade for the drainage pump, It has a motor (40).

The rotary blade 130 is rotatably accommodated in the pump chamber 25 . The rotary blade 130 includes a shaft portion 31, a large-diameter blade 33, a small-diameter blade 34, an auxiliary blade 35, a connecting portion 36, a water flow direction regulating portion 38, and a water flow It has an intake regulating part 139. The rotary blade 130 rotates except that the rotary blade 30 described in the first embodiment has a water flow inlet regulating portion 139 having a different shape in place of the water flow inlet regulating portion 39. It has the same configuration as the wing 30.

The water flow intake regulating portion 139 is formed in a columnar shape having a planar view shape (cross-sectional shape) slightly larger than the water flow direction regulating portion 38 and having a height lower than the water flow direction regulating portion 38. . The upper surface 139a of the water flow inlet regulating portion 139 is formed to be parallel to a plane orthogonal to the axial direction of the shaft portion 31 . The water flow intake regulating portion 139 is integrally provided under the water flow direction regulating portion 38 provided on the large-diameter blade 33 and the auxiliary blade 35 .

In this embodiment, the planar view shape of the water flow inlet regulating portion 139 protrudes outward in the radial direction and rearward in the rotational direction from the planar view shape of the water flow direction regulating portion 38, and the diameter near the front in the rotational direction is Oval, larger than diameter near posterior. That is, the water flow intake regulating portion 139 is rotated outward and radially from the upper portion of the water flow direction regulating portion 38, which is the outer end 33c of the large-diameter blade 33 and the outer end 35c of the auxiliary blade 35. protruding in the rearward direction. In addition, other shapes such as elliptical, rectangular, triangular, etc. may be sufficient as the plan view shape of the water flow inlet control part 139, as long as it does not contradict the objective of this invention.

Next, the action of the water flow intake regulating portion 139 provided on the large-diameter blade 33 will be described with reference to FIG. 8 . In addition, the water flow intake regulating portion 139 provided on the auxiliary blade 35 also has the same function.

When the rotary blade 130 rotates, water passes through the suction pipe 16 from the suction port 17 and is sucked up into the pump chamber 25 . Then, in the pump chamber 25, the water that hits the webbing surface 33a facing forward in the rotational direction of the large-diameter blade 33 partially passes through the upper end 33b of the large-diameter blade 33 and It flows to the rear side, and the other part passes through the outer end 33c of the large-diameter wing 33 and flows to the rear side of the large-diameter wing 33. At this time, since water is mainly supplied from the upper end portion 33b to the rear side of the large-diameter blade 33, the negative pressure of the portion near the lower end increases in the vicinity of the rear surface of the large-diameter blade 33 compared to the portion near the upper end.

Here, attention is paid to the flow of water passing through the outer end portion 33c of the large-diameter blade 33. A flow of water (shown schematically by an arrow F2 in FIG. 8 ) passing near the lower portion of the outer end portion 33c flows along the side surface 139b of the water flow intake regulating portion 139 .

Further, since the water flow inlet regulating portion 139 has an oval shape, a vortex of water separated from the side surface 139b (separation flow) is generated in a portion near the rear of the side surface 139b. As a result, the water flow F2 bulges outward so as to bypass the peeling flow.

In this way, the water flow intake regulating portion 139 expands the water flow F2 passing near the lower portion of the water flow direction regulating portion 38, which is the outer end portion 33c of the large-diameter blade 33, to the outside, thereby expanding the radial direction Regulate entry into the room. As a result, the flow of water passing near the upper portion of the water flow direction regulating portion 38 (shown schematically by arrow F1 in FIG. 8) and the flow F2 passing near the lower portion, the large-diameter blade 33 It is possible to suppress displacement in the radial direction on the webbed surface 35a of the auxiliary blade 35 immediately after the . Therefore, on the webbed surface 35a of the auxiliary blade 35 immediately after the large-diameter wing 33, the difference in the state of water hitting the part near the upper end 35b and the part near the lower end (near the connecting part 36) can prevent the occurrence of

9 shows a rotary blade 130A, which is a modified example of the rotary blade 130. In the rotary blade 130A of this modification, instead of the water flow direction regulating portion 38, the upper end is the same height as the large-diameter blade 33 and the auxiliary blade 35 (that is, the upper end is the large-diameter blade 33). It has the same structure as the rotary blade 130 described above except for having a columnar water flow direction regulating portion 38A (which does not protrude upward from the auxiliary blade 35).

Also in the rotor blade 130 of the second embodiment and the rotor blade 130A of its modification, the same effect as the rotor blade 30 of the first embodiment described above is achieved.

In each embodiment described above, the water flow intake regulating portions 39 and 139 are configured to protrude outward in the radial direction and rearward in the rotational direction from the water flow direction regulating portion 38, which is the outer end 33c of the large-diameter blade 33. , but is not limited to this. The water flow intake regulating portion may be configured to protrude at least outward in the radial direction and rearward in the rotational direction from the outer ends of the large-diameter blade and auxiliary blade, as long as the object of the present invention is not violated.

Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. In the above-described embodiments, additions, deletions, and design changes by those skilled in the art as appropriate, and appropriate combinations of features of the embodiments are also included within the scope of the present invention, as long as they do not contradict the spirit of the present invention. do.

1: drain pump
10: housing
11: main body
12: bottom wall
13: main wall
15: discharge pipe inlet
16: suction pipe
17: inlet
18: discharge pipe
19: discharge port
20: cover
21: branch office
22: bracket
23: attachment part
24: through hole
25: pump room
30: rotor blades
31: shaft part
32: attachment hole
33: Daegyeong wing
33a: webbed surface
33b: upper part
33c: outer end
34: blind wing
35: auxiliary wing
35a: webbed surface
35b: upper part
36: connection part
37: opening
38: water flow direction regulating unit
39: regulatory department
39a: upper surface
39b: side
40: motor
41: drive shaft
930: rotor blade
933: Daegyeong wing
933a: webbed side
933b: upper part
933c: outer end
935: aileron
935a: webbed side
935b: upper part
935c: outer end
936: connection part
937: opening
938: water flow direction regulating unit
f1: Water flow passing close to the top of the outer end of the large-diameter blade
f2: Water flow passing close to the bottom of the outer end of the large-diameter blade
F1: Water flow passing close to the top of the outer end of the large-diameter blade
F2: Water flow passing close to the lower part of the outer end of the large-diameter blade

Claims (6)

A drainage pump having a shaft portion, a plurality of large-diameter blades extending radially from the shaft portion, a plurality of small-diameter wings arranged in a row at the lower ends of the plurality of large-diameter blades, and an annular connecting portion connecting the lower ends of the plurality of large-diameter blades. As a dragon rotor,
It has a water flow intake regulating portion provided below the outer end of the large-diameter blade and protruding in at least one direction outward in the radial direction and rearward in the rotation direction from the top of the outer end,
The upper end of the water flow intake regulating portion is lower than the upper end of the large-diameter wing,
A rotary blade for a drainage pump, characterized in that an upward annular surface at an outer periphery of the connecting portion is lower than an upper end of the water flow inlet regulating portion over the entire circumference. A drainage pump having a shaft portion, a plurality of large-diameter blades extending radially from the shaft portion, a plurality of small-diameter wings arranged in a row at the lower ends of the plurality of large-diameter blades, and an annular connecting portion connecting the lower ends of the plurality of large-diameter blades. As a dragon rotor,
It has a water flow intake regulating portion provided below the outer end of the large-diameter blade and protruding in at least one direction outward in the radial direction and rearward in the rotation direction from the top of the outer end,
The rotation blade for the drainage pump, characterized in that the water flow intake regulating portion has an upper surface inclined upward from the front to the rear in the rotation direction. According to claim 1 or 2,
Further comprising a plurality of auxiliary wings disposed between the plurality of large-diameter wings,
A rotary blade for a drainage pump characterized in that it has a water flow intake regulating portion provided below the outer end of the auxiliary blade and protruding in at least one direction radially outward and rotationally rearward from the top of the outer end. According to claim 1 or 2,
The rotation blade for the drainage pump, characterized in that the water flow intake regulating portion is formed in an oval or elliptical shape in plan view. According to claim 1,
The rotation blade for the drainage pump, characterized in that the water flow intake regulating portion has an upper surface inclined upward from the front to the rear in the rotation direction. A drainage pump having a housing having a suction pipe provided with a suction port directed downward, rotary blades accommodated in the housing, and a motor for rotating the rotary blades,
The drainage pump characterized in that the rotary blade is the rotary blade for a drainage pump according to claim 1 or 2.

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