CN111503046A

CN111503046A - Rotary blade for drain pump and drain pump with same

Info

Publication number: CN111503046A
Application number: CN202010009690.2A
Authority: CN
Inventors: 佐藤克司; 加藤友也; 西山雄太
Original assignee: Fujikoki Corp
Current assignee: Fujikoki Corp
Priority date: 2019-01-30
Filing date: 2020-01-06
Publication date: 2020-08-07
Anticipated expiration: 2040-01-06
Also published as: JP6918367B2; JP2020122434A; KR20200094620A; CN111503046B

Abstract

Provided are a rotary vane for a drain pump and a drain pump having the same, which can effectively improve quietness while suppressing a reduction in discharge capacity. The rotary vanes (30) of the drain pump (1) are connected to the lower ends of the large-diameter vanes (33) and the auxiliary vanes (35) by a connecting part (36) having an opening (37) at the center. A thin section (38) is provided at a portion of the lower end sections of the large-diameter blades (33) that spans the opening (37), and a thin section (39) is provided at a portion of the lower end sections of the auxiliary blades (35) that spans the opening (37).

Description

Rotary blade for drain pump and drain pump with same

Technical Field

The present invention relates to a drain pump used in, for example, an indoor unit of an air conditioner, and a rotary vane for a drain pump provided in the drain pump.

Background

In an indoor unit of an air conditioner, moisture in air condenses and adheres to a heat exchanger when cooling operation is performed. The water attached to the heat exchanger is dropped as water droplets to the drain pan. Then, the water (drain) accumulated in the drain pan is discharged to the outside of the indoor unit by the drain pump. Patent document 1 discloses an example of a drain pump used in such an air conditioner.

Fig. 6 shows a rotary vane used in the drain pump of patent document 1. Fig. 6 (a) - (c) are perspective, plan and front views of the rotary blade. The rotary blade 930 has: a plurality of large-diameter flat blades 933 extending radially from the shaft portion 931, a plurality of small-diameter flat blades 934 provided at the lower end portions of the large-diameter blades 933 so as to be connected, and a plurality of auxiliary flat blades 935 provided between adjacent large-diameter blades 933. Lower ends of the large-diameter vanes 933 and the auxiliary vanes 935 are connected to each other by an annular connecting portion 936 having an opening 937 at the center. The upper end and the outer end of the agitating surface 933a of the large-diameter blade 933 facing the front in the rotation direction are provided with

stepped portions

933b, 933c for guiding the water agitated by each blade to the outer side of the blade.

Step portions

935b and 935c are similarly provided at the upper end and the outer end of the water-stirring surface 935a of the auxiliary blade 935. These stepped portions can suppress vibration and noise.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2013-64396

Technical problem to be solved by the invention

The inventors of the present application have conducted intensive studies to further improve the quietness of the rotary blade 930. As a result, the following was found: the large-diameter blades 933 are connected to the shaft portions 931, but the auxiliary blades 935 are not connected to the shaft portions 931, so that the amount of agitation by the auxiliary blades 935 is smaller than that of the large-diameter blades 933 with respect to the water stirred up by the small-diameter blades 934 and passed through the openings 937 of the connecting portions 936. In fig. 6 (b), the flow of water agitated by the large-diameter blades 933 is schematically shown by an arrow e1, and the flow of water agitated by the auxiliary blades 935 is schematically shown by an arrow e 2. The thicker the lines of the respective arrows e1, e2, the more the amount of agitated water.

Accordingly, the negative pressure on the rear side of the large-diameter vane 933 becomes larger than that on the rear side of the auxiliary vane 935. According to the difference in the negative pressure, the flow of water introduced from the outer end of the large-diameter vane 933 to the rear side (schematically indicated by the arrow f 2) is more greatly introduced to the radial inner side than the flow of water introduced from the outer end of the auxiliary vane 935 (schematically indicated by the arrow f 1), and vibration is generated by the difference in the flows of water. Here, the inventors of the present application have realized suppression of the generation of vibration and further reduction of noise due to vibration by extending the auxiliary vanes 935 radially inward and connecting them to the shaft portion 931 so that the difference between the amount of agitation of the large-diameter vanes 933 and the amount of agitation of the auxiliary vanes 935 is reduced with respect to water passing through the openings 937 of the connecting portion 936. Alternatively, by replacing auxiliary vanes 935 with large-diameter vanes 933 to which small-diameter vanes 934 are connected, the occurrence of vibration can be similarly suppressed.

However, since the large-diameter blades 933 and the auxiliary blades 935 need to have a thickness sufficient to provide the

stepped portions

933b, 933c and the

stepped portions

935b, 935c as measures against vibration and noise, the auxiliary blades 935 are connected to the shaft portion 931 so that the auxiliary blades 935 radially extend across the opening 937 of the connecting portion 936, thereby reducing the area of the opening 937. This causes another problem that the amount of water stirred up by the small-diameter vanes 934 and passing through the openings 937 is reduced, and the discharge capacity is reduced.

Disclosure of Invention

It is an object of the present invention to provide a rotary vane for a drain pump and a drain pump having the same, which can suppress a reduction in discharge capacity and effectively improve quietness.

Means for solving the problems

In order to achieve the above object, a rotary vane for a drain pump according to an aspect of the present invention includes: a shaft portion; a plurality of large-diameter blades extending radially from the shaft portion; a plurality of small-diameter blades connected to lower ends of the plurality of large-diameter blades; and a connecting portion having an opening provided at a center thereof and connecting lower end portions of the plurality of large-diameter blades, wherein a thin portion is provided at least at a lower end portion of a portion of the plurality of large-diameter blades that spans the opening.

In the present invention, it is preferable that the blade further includes a plurality of auxiliary blades extending in a radial direction from the shaft portion and disposed between the adjacent large diameter blades, the coupling portion couples lower end portions of the plurality of large diameter blades, and the coupling portion also couples lower end portions of the plurality of auxiliary blades, and a thin portion is provided at least at a lower end portion of a portion of the plurality of auxiliary blades that spans the opening.

In the present invention, it is preferable that the thin-walled portion is provided by thinning the rear surfaces of the plurality of large-diameter blades.

In the present invention, it is preferable that a stepped portion is provided at least one of an upper end portion and an outer end portion of the front surfaces of the plurality of large-diameter blades.

In the present invention, it is preferable that the thin-walled portion is provided by thinning a rear surface of the plurality of auxiliary blades.

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

In the present invention, it is preferable that a stepped portion is provided at an outer end portion of a front surface of the plurality of small-diameter blades, and the plurality of small-diameter blades are arranged to be shifted forward in the rotational direction with respect to the plurality of large-diameter blades.

In order to achieve the above object, a drain pump according to another aspect of the present invention includes: a housing having a suction pipe having a suction port facing downward; a rotary blade housed in the casing; and a motor that rotates the rotary vane, wherein the rotary vane is the rotary vane for the drain pump.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, the lower end portions of the plurality of large-diameter blades are connected to each other by a connecting portion having an opening at the center. At least the lower end of the portion of the large-diameter blades that spans the opening of the coupling portion is provided with a thin portion. Thus, by providing the thin portion, the area of the lower end surface of the plurality of large-diameter blades is reduced, and the area of the opening of the connecting portion can be increased. This can effectively suppress a decrease in the amount of water that is stirred up by the small-diameter blades and passes through the opening of the connecting portion. Therefore, the discharge performance can be suppressed from being lowered, and the quietness can be effectively improved.

Further, the present invention may further include a plurality of auxiliary blades extending in a radial direction from the shaft portion and disposed between adjacent large-diameter blades, wherein the coupling portion couples lower end portions of the plurality of large-diameter blades, and the coupling portion also couples lower end portions of the plurality of auxiliary blades, and wherein the thin portion is provided at least at a lower end portion of a portion of the plurality of auxiliary blades that spans the opening. Thus, by providing the thin portion, the area of the lower end surface of the plurality of auxiliary blades is reduced, and the area of the opening of the connecting portion can be increased. This can effectively suppress a decrease in the amount of water that is stirred up by the small-diameter blades and passes through the opening of the connecting portion. Therefore, the discharge performance can be suppressed from being lowered, and the quietness can be effectively improved.

Further, a stepped portion may be provided at an outer end portion of the front surface of each of the plurality of small-diameter blades, and the plurality of small-diameter blades may be arranged to be shifted forward in the rotational direction with respect to the plurality of large-diameter blades. Thus, by providing the step portion, the outer end portion of the small-diameter blade having a reduced (thin) thickness can be disposed at a position close to the front surface of the lower end surface of the large-diameter blade. Thus, the rear surface of the large-diameter blade can be thinned to a position closer to the shaft portion, and the thin portion can be provided, so that the area of the opening of the connecting portion can be further increased.

Drawings

Fig. 1 is a diagram showing a drain pump according to a first embodiment of the present invention.

Fig. 2 is a view showing rotary vanes of the drain pump of fig. 1.

Fig. 3 is a sectional view of the rotary blade of fig. 2.

Fig. 4 is a bottom view of the rotary blade of fig. 2.

Fig. 5 is a diagram showing a configuration of a modification of the rotary blade of fig. 2.

Fig. 6 is a view showing a rotary vane used in a conventional drain pump.

Description of the symbols

1 … drainage pump, 10 … casing, 11 … main body part, 12 … bottom wall part, 13 … peripheral wall part, 15 … discharge pipe inlet, 16 … suction pipe, 17 … suction port, 18 … discharge pipe, 19 … discharge port, 20 … cover, 21 … locking part, 22 … bracket, 23 … mounting part, 24 … through hole, 25 … pump chamber, 30 … rotary vane, 31 … shaft part, 32 … mounting hole, 33 … large diameter vane, 33a … water stirring surface, 33b … stepped part, 33c … stepped part, 33d … rear surface, 33e … lower end surface, 34 … small-diameter blade, 34a … water stirring surface, 34c … stepped part, 34f … outer end part, 35 … auxiliary blade, 35a … water stirring surface, 35b … stepped part, 35c … stepped part, 35d … rear surface, 35e … lower end surface, 36 … connecting part, 37 … opening, 38 … thin-wall part, 39 … thin-wall part, 40 … motor and 41 … driving shaft.

Detailed Description

The structure of the drain pump according to the embodiment of the present invention will be described below with reference to fig. 1 to 5. The drain pump of the present embodiment discharges, to the outside, drain water accumulated in a drain pan of an indoor unit of an air conditioner, as an example. Of course, the use of the drain pump is not limited to the drainage of the drain, and the drain pump can be used for drainage, pumping, and the like of various liquids.

Fig. 1 is a diagram illustrating a drain pump according to an embodiment of the present invention, and specifically, is a front view including a partial sectional view in which a lower portion of the drain pump is cut by a plane passing through an axis of a discharge pipe. Fig. 2 is a view showing a rotary vane used in the drain pump of fig. 1, and is a perspective view, a plan view, and a front view in the order of (a) to (c) in fig. 1. Fig. 3 is a sectional view of the rotary blade of fig. 2, specifically, a sectional view taken along line a-a of fig. 2 (b). Fig. 4 (a) is a bottom view of the rotor blade of fig. 2, and fig. 4 (b) is an enlarged bottom view of the vicinity of the small-diameter blade of fig. 4 (a). Fig. 5 is a view showing a configuration of a modification of the rotor blade of fig. 2, in which fig. 2 (a) is a bottom view of the rotor blade, and fig. 2 (b) is an enlarged bottom view of the vicinity of the small-diameter blade of fig. 5 (a).

As shown in fig. 1, the drain pump 1 of the present embodiment includes: a housing 10, a cover 20, a rotary vane 30 as a rotary vane for a drain pump, and a motor 40. In the present embodiment, the housing 10, the cover 20, and the rotary blade 30 are made of synthetic resin.

The housing 10 integrally has: a main body 11, a suction pipe 16, and a discharge pipe 18. The body 11 has a bottom wall 12 and a peripheral wall 13, the bottom wall 12 having an inverted truncated conical shape, and the peripheral wall 13 being connected to an outer peripheral edge of the bottom wall 12. The suction pipe 16 extends downward from the center of the bottom wall portion 12. A suction port 17 is provided at the lower end of the suction pipe 16 so as to face downward. The discharge pipe 18 extends laterally (rightward in fig. 1) from the peripheral wall portion 13. A discharge port 19 is provided at the tip of the discharge pipe 18 so as to face sideways. A discharge pipe inlet 15 as an inlet of a discharge pipe 18 is provided in the peripheral wall portion 13 of the main body portion 11.

The housing 10 has a space in which a rotary vane 30 described later is disposed inside the housing 10, and the housing 10 forms a pump chamber 25 by surrounding the space together with the cover 20.

The lid 20 has a substantially cylindrical shape, a lower end portion of the lid 20 is fitted to the peripheral wall portion 13 of the main body portion 11 of the housing 10, and the lid 20 is fixedly attached to the housing 10 by a not-shown engagement mechanism. A bracket 22 is attached to an upper end portion of the cover 20 via an engaging portion 21. The bracket 22 is provided with a mounting portion 23 for mounting the drain pump 1 to another device. The cover 20 houses a motor 40 for rotating the rotary blade 30.

The rotary vane 30 is rotatably housed in the pump chamber 25. As shown in fig. 2 to 4, the rotary blade 30 has: the shaft portion 31, a plurality of large-diameter blades 33, a plurality of small-diameter blades 34, and a plurality of auxiliary blades 35. The rotary vane 30 has an annular coupling portion 36, the coupling portion 36 has a reverse cone frustum shape, and an opening 37 is provided in the center of the coupling portion 36. The coupling portion 36 is disposed coaxially with the shaft portion 31. In the present embodiment, the large-diameter blades 33, the small-diameter blades 34, and the auxiliary blades 35 of the rotary blade 30 are formed in a flat plate shape having the same thickness, and four large-diameter blades 33, small-diameter blades 34, and auxiliary blades 35 are provided. The rotary blade 30 rotates counterclockwise about the shaft 31 in fig. 2 (b), and rotates clockwise in fig. 4.

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. The shaft 31 has an upper end provided with a mounting hole 32. The mounting hole 32 is fitted with a drive shaft 41 of the motor 40.

The large-diameter blades 33 extend in the radial direction (radially outward) from the outer peripheral surface of the shaft portion 31. The lower ends of the large-diameter blades 33 are connected to each other by a connecting portion 36, and the large-diameter blades 33 are arranged at equal angular intervals (90-degree intervals in the present embodiment) around the shaft portion 31. Stepped

steps

33b and 33c are provided at the upper end and the outer end near the radially outer end of the paddle surface 33a of the large diameter blades 33, and the paddle surface 33a is the front surface of the large diameter blades 33 facing the front in the rotation direction. The stepped portion 33b functions to stir up the drain water and guide the drain water to the outside. The step portion 33c functions to guide the drain water radially outward. The

step portions

33b and 33c cooperate with each other to expand the position of the gas-liquid interface of water further outward to the extent that the position reaches the outer end of the large-diameter blade 33, thereby suppressing vibration and noise. Although it is preferable to provide at least one of the stepped

portions

33b and 33c, the stepped

portions

33b and 33c may be omitted.

A thin portion 38 is provided at a portion of the lower end portions of the large-diameter blades 33 that spans the opening 37 of the coupling portion 36. The thin portion 38 is provided by thinning a rear surface 33d of the large-diameter blade 33 facing rearward in the rotation direction. By providing the thin portion 38, the area of the lower end surface 33e of the large-diameter blade 33 is reduced. Therefore, the area of the opening 37 of the coupling portion 36 can be increased. Although the thin portion 38 can be provided by thinning the water stirring surface 33a, it is preferable to thin the rear surface 33d and provide the thin portion 38 because the flow of water stirred by the large diameter blade 33 may be disturbed.

The plurality of small-diameter blades 34 are connected to a portion near the shaft portion 31 at the lower end of each large-diameter blade 33, and extend downward. 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 (in the present embodiment, at 90-degree intervals) around the shaft portion 31. A stepped step portion 34c is provided at an outer end portion 34f of the water stirring surface 34a of each small-diameter blade 34, and the water stirring surface 34a is a front surface of the small-diameter blade 34 facing forward in the rotation direction.

As shown in fig. 4, the plurality of small-diameter blades 34 are arranged offset forward in the rotational direction with respect to the plurality of large-diameter blades 33. That is, the angle θ formed by the large-diameter blades 33 and the small-diameter blades 34 is greater than 0 (θ > 0). In fig. 4 (b), a line S represents an extending direction of one large-diameter blade 33 when viewed from below, and a line T represents an extending direction of one small-diameter blade 34 connected to the one large-diameter blade 33 when viewed from below. Thus, the outer end portion 34f of the small-diameter blade 34, which is reduced in thickness (thinned) by the provision of the step portion 34c, can be disposed at a portion of the lower end surface 33e of the large-diameter blade 33, which is close to the water stirring surface 33 a. Thus, the rear surface 33d of the large-diameter blade 33 can be thinned to a position closer to the shaft portion 31 to provide the thin portion 38 without making the small-diameter blade 34 radially smaller, and the area of the opening 37 of the connecting portion 36 can be further increased. Further, like the rotary vane 30A shown in fig. 5, the large-diameter vane 33 and the small-diameter vane 34 may be configured not to be displaced in the rotational direction (that is, the line S and the line T may be identical, and θ is 0).

The plurality of auxiliary blades 35 and the plurality of large-diameter blades 33 extend in the radial direction (radially outward) from the outer peripheral surface of the shaft portion 31 in the same manner. The lower ends of the plurality of auxiliary vanes 35 and the plurality of large-diameter vanes 33 are connected by the connection portion 36, and the plurality of auxiliary vanes 35 are disposed in the middle of the large-diameter vanes 33 adjacent in the rotation direction. The small-diameter blades 34 are not connected to the lower end portions of the auxiliary blades 35. Stepped

steps

35b and 35c are provided at the upper end and the outer end of the water-stirring surface 35a of the plurality of auxiliary blades 35, and the water-stirring surface 35a is the front surface of the plurality of auxiliary blades 35 facing the front in the rotation direction. These

step portions

35b and 35c exert the same action and effect as the

step portions

33b and 33c of the large-diameter blade 33. Although it is preferable to provide at least one of the stepped

portions

35b and 35c, the stepped

portions

35b and 35c may be omitted.

Thin portions 39 are provided at the lower end portions of the auxiliary blades 35 at positions that straddle the openings 37 of the coupling portion 36. The thin portion 39 is provided by thinning a rear surface 35d of the auxiliary blade 35 facing rearward in the rotational direction. By providing the thin-walled portion 39, the area of the lower end surface 35e of the auxiliary blade 35 is reduced. Therefore, the area of the opening 37 of the coupling portion 36 can be increased. Further, although the thin-walled portion 39 can be provided by thinning the agitating surface 35a, it is preferable to thin the rear surface 35d because there is a possibility that the flow of water agitated by the auxiliary blade 35 is disturbed.

As described above, according to the drain pump 1 of the present embodiment, the lower ends of the plurality of large-diameter vanes 33 and the plurality of auxiliary vanes 35 are connected to each other by the connection portion 36 having the opening 37 at the center. Thin portions 38 are provided at the lower end portions of the large-diameter blades 33 at positions across the openings 37, and thin portions 39 are provided at the lower end portions of the auxiliary blades 35 at positions across the openings 37. Thus, by providing the

thin portions

38 and 39, the areas of the lower end surfaces 33e of the large-diameter blades 33 and the lower end surfaces 35e of the auxiliary blades 35 can be reduced, and the area of the opening 37 of the connecting portion 36 can be increased accordingly. This can effectively suppress a decrease in the amount of water that is stirred up by the small-diameter blades 34 and passes through the opening 37 of the connection portion 36. Therefore, the discharge performance can be suppressed from being lowered, and the quietness can be effectively improved.

In the above embodiment, the auxiliary vane 35 is provided between the adjacent large diameter vanes 33, but the auxiliary vane 35 may be replaced with a large diameter vane 33 having a small diameter vane 34 connected to the lower end portion thereof. This structure can also exhibit the same operation and effect as those of the above-described embodiment.

The embodiments of the present invention have been described above, but the present invention is not limited to these embodiments. The present invention is not limited to the above-described embodiments, and those skilled in the art can appropriately add, delete, design, modify, or combine features of the embodiments without departing from the spirit of the present invention.

Claims

1. A rotary vane for a drain pump, comprising: a shaft portion; a plurality of large-diameter blades extending radially from the shaft portion; a plurality of small-diameter blades connected to lower ends of the plurality of large-diameter blades; a connecting portion provided with an opening at a center thereof and connecting lower end portions of the plurality of large-diameter vanes, the rotary vane for a drain pump being characterized in that,

at least the lower end of the part of the plurality of large-diameter blades spanning the opening is provided with a thin portion.

2. A rotary vane for a drain pump according to claim 1,

further comprising a plurality of auxiliary blades extending in the radial direction from the shaft portion and disposed between the adjacent large-diameter blades,

the connecting portion connects lower ends of the plurality of large-diameter blades and also connects lower ends of the plurality of auxiliary blades,

at least the lower end of the portion of the plurality of auxiliary blades that spans the opening is provided with a thin portion.

3. A rotary vane for a drain pump according to claim 1,

the thin-walled portion is provided by thinning the rear surfaces of the plurality of large-diameter blades.

4. The rotary blade for water drainage according to claim 3,

a stepped portion is provided at least one of an upper end portion and an outer end portion of the front surfaces of the plurality of large-diameter blades.

5. The rotary blade for water drainage according to claim 2,

the thin-walled portion is provided by thinning the rear surfaces of the plurality of auxiliary blades.

6. The rotary blade for water drainage according to claim 5,

a stepped portion is provided at least one of an upper end portion and an outer end portion of the front surfaces of the plurality of auxiliary blades.

7. The rotary blade for water drainage according to claim 3 or 4,

a step part is arranged at the outer side end part of the front surface of the small-diameter blades,

the plurality of small-diameter blades are arranged to be shifted forward in the rotational direction with respect to the plurality of large-diameter blades.

8. A drain pump, comprising: a housing having a suction pipe having a suction port facing downward; a rotary blade housed in the casing; and a motor that rotates the rotary blade,

the drain pump is characterized in that it is provided with,

the rotary vane is the rotary vane for a drain pump according to any one of claims 1 to 7.