KR20200094620A - Rotary vanes for drain pump and drain pumps having them - Google Patents

Abstract

The present invention relates to a rotary blade for a drain pump capable of effectively increasing the quietness while suppressing a decrease in discharge capacity, and a drain pump having the same. The rotary blade (30) of the drain pump (1) is connected by a connection part (36) having an opening (37) at the center of each lower end part of a plurality of large diameter blade (33) and a plurality of auxiliary blade (35). In addition, a thin portion (38) is provided at a location passing through the opening (37) at the lower end part of the plurality of large diameter blade (33), and a thin portion (39) is provided at the location passing through the opening (37) at the lower end part of the plurality of auxiliary blade (35).

Description

A rotary pump for a drainage pump and a drainage pump having the same{ROTARY VANES FOR DRAIN PUMP AND DRAIN PUMPS HAVING THEM}

The present invention relates to, for example, a drain pump used in an indoor unit of an air conditioner and 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 condenses and adheres to the heat exchanger during cooling operation. The water adhering to the heat exchanger becomes water droplets and falls on the drain pan. Then, the water (drain water) accumulated in the drain pan is discharged to the outside of the indoor unit by the drain pump. An example of a drain pump used in such an air conditioner is disclosed in Patent Document 1.

The rotary blade used for the drain pump of patent document 1 is shown in FIG. 6(a) to 6(c) are perspective, plan, and front views of this rotary blade. The rotary blade 930 includes a plurality of flat-shaped large-diameter blades 933 extending in the radial direction from the shaft portion 931, and a plurality of flat-shaped small-diameter blades 934 addressed to the lower end of the large-diameter blade 933, It has a plurality of flat-shaped auxiliary wings 935 provided between neighboring large diameter wings 933. The large-diameter wing 933 and the auxiliary wing 935 are connected by an annular connecting portion 936 having an opening 937 in the center of each lower end. The upper end and the outer end of the webbing surface 933a facing forward in the rotational direction of the large-diameter wing 933 are provided with ends 933b and 933c for guiding water from each wing toward the outside of the wing. The upper ends and outer ends of the web surface 935a of the auxiliary wing 935 are similarly provided with ends 935b and 935c. By these ends, vibration and noise can be suppressed.

Patent Document 1: Japanese Patent Application Publication No. 2013-64396

The present inventors conducted a polite study with the aim of further improving the silentness of the rotary blade 930. As a result, since the large-diameter wing 933 is connected to the shaft portion 931 and the auxiliary wing 935 is not connected to the shaft portion 931, the small-diameter wing 934 raises the connection portion 936. With respect to the water passing through the opening 937 of ), it was found that the amount of the auxiliary wing 935 is less than that of the large diameter wing 933. In FIG. 6(b), the flow of water through the large-diameter wing 933 is schematically illustrated by an arrow e1, and the flow of water through the auxiliary wing 935 is schematically illustrated by an arrow e2. Each arrow (e1, e2) indicates that the thicker the line, the greater the amount of water to scatter.

As a result, the negative pressure of the rear side of the large-diameter blade 933 is greater than that of the auxiliary blade 935. Due to the difference in the negative pressure, the water flowing in from the outer end of the large diameter wing 933 to the rear side (shown schematically with the arrow f2) is the water drawn into the rear side from the outer end of the auxiliary wing 935. The flow is larger inward in the radial direction than in the flow (which is schematically illustrated by the arrow f1), and vibration due to the difference in the flow of the water is generated. Thus, the present inventors extend the auxiliary wing 935 in the radial direction to connect to the shaft portion 931, thereby assisting the amount and diameter of the large diameter wing 933 with respect to the water passing through the opening 937 of the connection portion 936. By reducing the difference in the amount of the wing 935, the occurrence of vibration was suppressed, and further reduction of noise caused by vibration was realized. Alternatively, the occurrence of vibration can also be suppressed by replacing the auxiliary wing 935 with the large diameter wing 933 to which the small diameter wing 934 is connected.

However, as a countermeasure against vibration or noise, the large-diameter wing 933 and the auxiliary wing 935 need a thickness as long as the ends 933b, 933c and the ends 935b, 935c are provided. By connecting to the shaft portion 931, the auxiliary wing 935 rides over the opening 937 of the connecting portion 936 in the radial direction, thereby reducing the area of the opening 937. As a result, the amount of water passing through the opening 937 by being lifted up by the small-diameter blade 934 is reduced, causing another problem that the discharge capacity is lowered.

Therefore, it is an object of the present invention to provide a drainage pump rotary blade and a drainage pump having the same, which can effectively increase the quietness while suppressing a decrease in discharge capacity.

In order to achieve the above object, a rotary blade for a drain pump according to an aspect of the present invention includes a shaft portion, a plurality of large diameter blades extending in a radial direction from the shaft portion, and a plurality of small diameter blades addressed to the lower end of the plurality of large diameter blades And, the opening is provided in the center, as a rotary blade for a drainage pump having a connecting portion connecting the lower end of the plurality of large diameter wings, at least the lower end of the plurality of large diameter blades over the opening of the opening is provided It is characterized by.

In the present invention, it extends in the radial direction from the shaft portion, and also has a plurality of auxiliary blades disposed in the middle of the adjacent large diameter blades, and the connecting portion also includes a bottom portion of the plurality of auxiliary blades together with the bottom portions of the plurality of large diameter blades. It is preferable that a thin portion is provided on at least a lower end portion of the plurality of auxiliary blades that cross the opening.

In the present invention, it is preferable that the thin portion is provided by cutting out the rear surfaces of the plurality of large diameter wings.

In the present invention, it is preferable that an end is provided at least on one of the upper end and the outer end of the front surface of the plurality of large diameter wings.

In the present invention, it is preferable that the thin portion is provided by cutting out the rear surfaces of the plurality of auxiliary wings.

In the present invention, it is preferable that an end is provided at least on one of the upper end and the outer end of the front surface of the plurality of auxiliary blades.

In the present invention, it is preferable that an end is provided at an outer end of the front surface of the plurality of small-diameter blades, and the plurality of small-diameter blades are disposed outward in a rotational direction with respect to the plurality of large-diameter wings.

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 having a downwardly intake port, a rotary blade accommodated in the housing, and a motor rotating the rotary blade. The rotary blade is a rotary blade for the drain pump.

According to the present invention, the plurality of large-diameter wings are connected to the lower end of each of them by a connection portion provided with an opening in the center. In addition, a thin portion is provided on at least a lower end portion of the plurality of large-diameter blades over the opening of the connecting portion. By doing in this way, the area of the bottom surface of the plurality of large diameter blades is reduced by providing the thin portion, and the area of the opening of the connecting portion can be increased. Thereby, it is possible to effectively suppress a decrease in the amount of water that has been lifted by the small-diameter wing and has passed through the opening of the connecting portion. Therefore, it is possible to effectively increase the quietness while suppressing a decrease in discharge capacity.

In addition, it extends in the radial direction from the shaft portion, and also has a plurality of auxiliary blades arranged in the middle of neighboring large diameter wings, and the connecting portion connects the lower ends of the plurality of auxiliary wings together with the lower ends of the plurality of large diameter wings, and the plurality of auxiliary wings A thin portion may be provided on at least the lower end of the point over which the middle opening is crossed. By doing in this way, the area of the bottom surface of the plurality of auxiliary blades is reduced by providing the thin portion, and the area of the opening of the connecting portion can be increased. Thereby, it is possible to effectively suppress a decrease in the amount of water that is lifted up by the small-diameter wing and passes through the opening of the connecting portion. Therefore, it is possible to effectively increase the quietness while suppressing a decrease in discharge capacity.

Further, ends may be provided at the outer ends of the front surfaces of the plurality of small-diameter blades, and the plurality of small-diameter blades may be disposed off the forward direction of the rotation with respect to the plurality of large-diameter blades. By doing in this way, by providing the end portion, the outer end portion of the small-diameter wing having a small thickness (thin) can be arranged at a location near the front surface at the lower end surface of the large-diameter blade. Thereby, the back surface of the large-diameter blade can be cut out to a position closer to the shaft portion to provide a thin portion, so that the area of the opening of the connecting portion can be further increased.

1 is a view showing a drain pump according to a first embodiment of the present invention.
2 is a view showing a rotary blade used in the drain pump of FIG. 1;
Figure 3 is a cross-sectional view of the rotary blade of Figure 2;
Figure 4 is a bottom view of the rotary blade of Figure 2;
5 is a view showing the configuration of a modification of the rotary blade of FIG. 2;
6 is a view showing a rotary blade used in a conventional drainage pump.

Hereinafter, the configuration of the drain pump according to the embodiment of the present invention will be described with reference to Figs. The drain pump of this embodiment is, as an example, for discharging drain water accumulated in the drain pan of the indoor unit of the air conditioner to the outside. Of course, the use of this drain pump is not limited to draining of drain water, but can be used for draining or pumping of various liquids.

1 is a view showing a drain pump according to an embodiment of the present invention, specifically, a front view including a partial cross-sectional view cut along a plane passing through the axis of the discharge pipe with respect to the lower portion of the drain pump. 2 is a view showing a rotary blade used in the drain pump of FIG. 1, (a) to (c) are, in turn, a perspective view, a plan view, and a front view. 3 is a cross-sectional view of the rotary blade of FIG. 2, and specifically, it is a cross-sectional view taken along line A-A of FIG. 2(b). FIG. 4(a) is a bottom view of the rotary blade of FIG. 2, and FIG. 4(b) is an enlarged bottom view of the vicinity of the small-diameter wing of FIG. 4(a). FIG. 5 is a view showing the configuration of a modification of the rotary blade of FIG. 2, (a) is a bottom view of the rotary blade, and (b) is a bottom view of the vicinity of the small-diameter wing of FIG. 5(a).

As shown in Fig. 1, the drain pump 1 of this embodiment has a housing 10, a cover 20, a rotary blade 30 as a rotary blade for a drain pump, and a motor 40. . 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 main body portion 11 has a bottom wall portion 12 having an inverted truncated cone shape, and a main wall portion 13 addressed to the outer periphery of the bottom wall portion 12. The suction pipe 16 extends downward from the center of the bottom wall portion 12. A suction port 17 facing downward is provided at a lower end of the suction tube 16. The discharge pipe 18 extends from the main wall portion 13 to the side (the right direction in FIG. 1 ). A discharge port 19 facing the side is provided at the distal end of the discharge tube 18. The main wall portion 13 of the body portion 11 is provided with a discharge pipe inlet 15 that serves as an inlet to the discharge pipe 18.

The housing 10 has a space in which a rotary blade 30, which will be described later, is disposed on its inner side, and surrounds the space together with the cover 20 to form a pump chamber 25.

The cover 20 has a roughly cylindrical shape, and its lower end fits into the main wall portion 13 of the body portion 11 of the housing 10 and is fixed and attached to the housing 10 by a snap-fit mechanism (not shown). do. The bracket 22 is attached to the upper end portion of the cover 20 through the locking portion 21. The bracket 22 is provided with an attachment portion 23 for providing the drainage pump 1 to another device. A motor 40 for rotating the rotary blade 30 is accommodated in the cover 20.

The rotary blade 30 is rotatably accommodated in the pump chamber 25. 2 to 4, the rotary blade 30 has a shaft portion 31, a plurality of large-diameter blades 33, a plurality of small-diameter blades 34, and a plurality of auxiliary blades 35. have. In addition, the rotary blade 30 has an inverted truncated cone shape, and has an annular connection portion 36 having an opening 37 in the center. The connecting portion 36 is disposed coaxially with the shaft portion 31. In this embodiment, the rotary blade 30 has a large-diameter wing 33, a small-diameter wing 34, and an auxiliary wing 35 formed in a flat plate shape of the same thickness, and each has four sheets. The rotary blade 30 is rotated counterclockwise around the shaft portion 31 in FIG. 2(b), and clockwise in FIG. 4.

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

The plurality of large diameter blades 33 extend in the radial direction (outside the radial direction) from the outer circumferential surface of the shaft portion 31. The plurality of large-diameter wings 33 are connected to each other by the lower ends of the connecting portions 36, and are arranged at equal intervals (in this embodiment, at 90-degree intervals) around the shaft portion 31. The plurality of large-diameter wings 33 are provided with stepped ends 33b and 33c at the upper end of the webbing surface 33a, which is the front facing toward the rotational direction, and at the outer end, which is the end near the radially outer side. The end portion 33b serves to guide the water outward by flipping the drain water upward. The end 33c serves to guide the drain water outward in the radial direction. Due to the synergistic action of these end portions 33b and 33c, the position of the gas-liquid boundary surface of the water swells more outwardly and becomes so as to catch the outer end of the large-diameter wing 33, so that vibration and noise can be suppressed. Although it is preferable that at least one of these ends 33b and 33c is provided, a configuration in which the ends 33b and 33c are omitted may be used.

A thin portion 38 is provided at a location over the opening 37 of the connecting portion 36 at the lower end of the plurality of large diameter wings 33. The thin portion 38 is provided by cutting out the rear face 33d facing the rear of the large diameter blade 33 in the rotational direction. By providing the thin portion 38, the area of the lower surface 33e of the large diameter wing 33 is reduced. Therefore, the area of the opening 37 of the connecting portion 36 can be increased. In addition, the thin portion 38 may be provided by cutting out the webbed surface 33a, but since the large diameter wing 33 may cause disturbance in the flow of water, the rear surface 33d is cut out. It is preferable to provide a thin portion 38.

The plurality of small-diameter wings 34 are addressed to portions near the shaft portion 31 at the lower end of each large-diameter wing 33 and extend downward. A plurality of small-diameter wings 34 are inserted into the suction pipe 16. The plurality of small-diameter blades 34 are arranged at equiangular intervals (90-degree intervals in this embodiment) around the shaft portion 31. A stepped end 34c is provided at the outer end 34f of the webbing surface 34a, which is the front facing toward the front in the rotational direction of each small-wing blade 34.

As shown in FIG. 4, the plurality of small-diameter blades 34 are disposed out of the rotational direction forward with respect to the plurality of large-diameter blades 33. That is, the angle θ formed between the large-diameter wing 33 and the small-diameter wing 34 is greater than 0 (θ>0). In Fig. 4(b), the line S is a line showing the extending direction of one large-diameter wing 33 when viewed from below, and the line T is the single large-diameter wing 33 when viewed from below. It is a line showing the extending direction of one small-diameter wing 34 connected to. By doing in this way, the webbing surface 33a of the lower end surface 33e of the large-diameter wing 33 is attached to the outer end 34f of the small-diameter wing 34 whose thickness is small (thin) by providing the end 34c. Can be placed at any location. Thereby, without making the small diameter blade 34 smaller in the radial direction, the rear face 33d of the large diameter blade 33 is cut out to a position closer to the shaft portion 31, so that the thin portion 38 can be provided. The area of the opening 37 of the connecting portion 36 can be further increased. In addition, as in the rotary blade 30A shown in FIG. 5, a configuration in which the large-diameter blade 33 and the small-diameter blade 34 do not deviate from the rotational direction (that is, the configuration in which the line S and the line T coincide), θ = 0) may be employed.

The plurality of auxiliary wings 35, like the plurality of large-diameter wings 33, extend in the radial direction (outside the radial direction) from the outer peripheral surface of the shaft portion 31. The plurality of auxiliary wings 35 is connected to the lower end part by a connecting portion 36 together with the plurality of large diameter wings 33, and is disposed in the middle of the adjacent large diameter wings 33 in the rotational direction. The small-diameter wing 34 is not spoken at the lower end of the plurality of auxiliary wings 35. The plurality of auxiliary wings 35 are provided with stepped ends 35b and 35c at the upper end and the outer end of the webbing surface 35a, which is the front facing toward the front in the rotational direction. These ends 35b and 35c achieve the same effect as the ends 33b and 33c of the large-diameter wing 33. Although it is preferable that at least one of these ends 35b and 35c is provided, a structure in which the ends 35b and 35c are omitted may be used.

A thin portion 39 is provided at a location over the opening 37 of the connecting portion 36 at the lower end of the plurality of auxiliary blades 35. The thin portion 39 is provided by cutting out the rear surface 35d toward the rear in the rotational direction of the auxiliary blade 35. By providing the thin portion 39, the area of the lower surface 35e of the auxiliary wing 35 is reduced. Therefore, the area of the opening 37 of the connecting portion 36 can be increased. In addition, the thin portion 39 may be provided by cutting out the webbing surface 35a, but since the auxiliary wing 35 may cause confusion in the flow of water, the rear surface 35d is cut out. It is preferred.

As described above, according to the drain pump 1 of the present embodiment, the plurality of large-diameter wings 33 and the plurality of auxiliary wings 35 are connected by a connection portion 36 in which each lower end portion is provided with an opening 37 in the center. It is done. In addition, a thin portion 38 is provided at a place where the plurality of large-diameter wings 33 ride over the opening 37 at the lower end, and a location where the plurality of auxiliary wings 35 ride over the opening 37 at the lower end. In the thin portion 39 is provided. By doing so, the area of the lower surface 33e of the plurality of large diameter blades 33 and the lower surface 35e of the plurality of auxiliary blades 35 is reduced by providing the thin portion 38 and the thin portion 39. By doing so, the area of the opening 37 of the connecting portion 36 can be increased. Thereby, it is possible to effectively suppress a decrease in the amount of water that is lifted up by the small-diameter wing 34 and passes through the opening 37 of the connecting portion 36. Therefore, it is possible to effectively increase the quietness while suppressing a decrease in discharge capacity.

In the above-described embodiment, the auxiliary wing 35 was provided in the middle of the adjacent large-diameter wing 33, but the auxiliary wing 35 was replaced with the small-diameter wing 34 connected to the lower end by a large-diameter wing 33. You may employ. Also in this configuration, the same effect as in the above embodiment is achieved.

Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. With respect to the above-described embodiments, those skilled in the art, as appropriate, additionally removing components and design changes, or properly combining the characteristics of the embodiments are included in the scope of the present invention, as long as it does not contradict the spirit of the present invention.

1: drain pump 10: housing
11: Body part 12: Bottom wall part
13: main wall 15: discharge pipe inlet
16: suction pipe 17: suction port
18: discharge pipe 19: discharge port
20: cover 21: locking portion
22: bracket 23: attachment
24: through hole 25: pump chamber
30: rotary blade 31: shaft portion
32: attachment hole 33: large diameter wing
33a: webbed surface 33b: end
33c: end 33d: rear
33e: bottom side 34: narrow-wing
34a: webbed surface 34c: end
34f: outer end 35: auxiliary wing
35a: webbed surface 35b: end
35c: end 35d: rear
35e: bottom surface 36: connection
37: opening 38: thin portion
39: thin part 40: motor
41: drive shaft

Claims (8)

A shaft portion, a plurality of large-diameter blades extending in the radial direction from the shaft portion, a plurality of small-diameter blades spoken to the lower end of the plurality of large-diameter blades, an opening provided in the center, and a connecting portion connecting the lower ends of the plurality of large-diameter blades As a rotary blade for a drain pump having a,
A rotary blade for a drainage pump, characterized in that a thin portion is provided on at least a lower end of the plurality of large-diameter wings over the opening. According to claim 1,
It also extends in the radial direction from the shaft portion, and also has a plurality of auxiliary wings arranged in the middle of the adjacent large diameter wings,
The connecting portion connects the lower ends of the plurality of auxiliary blades together with the lower ends of the plurality of large diameter wings,
A rotary blade for a drain pump, characterized in that a thin portion is provided on at least a lower end of a portion of the plurality of auxiliary wings that ride over the opening. According to claim 1,
Rotary blade for a drain pump, characterized in that the thin portion is provided by cutting out the rear surface of the plurality of large diameter wings. According to claim 3,
A rotary blade for a drain pump, characterized in that an end is provided in at least one of an upper end and an outer end of the front surface of the plurality of large diameter wings. According to claim 2,
A rotary blade for a drain pump, characterized in that the thin portion is provided by cutting out the rear surfaces of the plurality of auxiliary blades. The method of claim 5,
A rotary blade for a drain pump, characterized in that an end is provided in at least one of an upper end and an outer end of the front surface of the plurality of auxiliary wings. The method of claim 3 or 4,
An end is provided at an outer end of the front surface of the plurality of small-diameter wings,
The plurality of small diameter blades are rotating blades for a drain pump, characterized in that disposed in the direction of rotation of the plurality of large diameter blades forward. A drainage pump having a housing having a suction pipe having a suction port facing downward, a rotary blade accommodated in the housing, and a motor rotating the rotary blade,
A drain pump characterized in that the rotary blade is a rotary blade for a drain pump according to any one of claims 1 to 7.

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