JP2017096104A - Drainage pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drainage pump of which quietness at the time of its operation is further improved.SOLUTION: A rotary blade 50 used at a drainage pump has a large diameter blade 60 provided with water scraper surfaces 61 formed into a plurality of plates extending in a radial direction from a shaft part connected to an output shaft of a motor in a radial direction; a plurality of plate-like small diameter blades connected to lower end edges of the large diameter blades 60; and auxiliary blades provided with the water scraping surfaces and arranged between the adjoining large diameter blades 60. In the prior art, water scraped up by the water scraping surfaces 61 of the large diameter blades 60 and the auxiliary blades became water flow in yz direction by the upper edge part 62 and water flow in xy direction by the side edge part 63, crashed against the rear surfaces of the water-scraping surfaces and generated eddy flow produce noise. However, this invention can change the flow into the water flow of in xy direction by a water flow direction restricting part, reduce occurrence of eddy flow caused by striking of the water flow and prevent occurrence of noise.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a drainage pump, and more particularly to a drainage pump suitable for draining drain water in a drain pan that receives water condensed in an indoor heat exchanger of an air conditioner to the outside. To do.

  2. Description of the Related Art Conventionally, an air conditioner embedded in a ceiling of a room is equipped with a drain pan that receives drain water condensed on the surface of the indoor heat exchanger of the air conditioner. In order to drain the drain water in the drain pan to the outside, a drain pump (drain pump) is used.

  Hereinafter, a drainage pump used in an air conditioner already filed and published by the applicant of the present application will be described as a conventional technique. FIG. 5 is a front view showing a part of a conventional drainage pump, with FIG. 6A being a plan view of an example of a rotary blade used in the drainage pump shown in FIG. FIG. 6B is a front view of the rotary blade shown in FIG. 7 is an enlarged view of the main part of the rotary blade shown in FIG. 6, FIG. 7 (a) is a plan view, FIG. 7 (b) is a front longitudinal sectional view, and FIG. It is a perspective view. In this specification, the terms “upper or upper”, “lower or lower”, “inner or inner”, “outer or outer”, and the like are shown in FIG. ) Relative to the direction of the xyz coordinate axis and the rotation axis of the rotating blades, and does not have any meaning as an absolute direction. That is, “upper or upper” and “lower or lower” mean upward or downward along the z-coordinate axis of FIG. 7C, and “inside or inward” and “outer or outward” This means the right direction or left direction of FIG. 7C along the x coordinate axis of FIG. Moreover, although the water flow is shown by arrows xy, yz, etc., the side to which the arrow is directed is used as the downstream, and the opposite side is used as the upstream.

  The drainage pump generally indicated by reference numeral 1 includes a motor 10 and a pump main body 30 attached to the motor 10 via a bracket 20. The pump main body 30 is made of plastic, and includes a housing 40 having an upper opening and a cover 32 that covers the upper opening of the housing 40. The housing 40 has a pipe-like suction port 42 having an opening 43 at the lower end, a pump chamber 44 formed inside, and a discharge port 46 protruding toward the side. The cover 32 is formed integrally with the bracket 20, and is connected to the housing 40 with a seal member 34 sandwiched between the cover 32 and the housing 40.

  A rotating blade 50 that is rotated by the motor 10 is accommodated in the pump chamber 44 of the housing 40. The rotary blade 50 includes a shaft portion 52, a plurality of (four in the illustrated example) flat large-diameter blades 60 that extend radially from the outer periphery of the shaft portion 52, and a lower edge of each large-diameter blade 60. A plurality of (four as many large-diameter blades 60) flat plate-like small-diameter blades 54 that are connected and inserted into the suction port 42 are provided.

  The shaft portion 52 passes through a through hole 36 formed in the center of the cover 32 and protrudes toward the motor 10. The drive shaft 12 of the motor 10 is inserted into a hole 53 provided along the central axis of the shaft portion 52. Has been fixed. A draining disc 14 is attached to the upper surface of the shaft portion 52, and this draining disc 14 prevents the drain water from being ejected from the through hole 36 of the cover 32 to the motor 10 side. .

The lower end edge of each large-diameter blade 60 is formed in a tapered shape that is inclined downward toward the inner diameter side, and each lower end edge is connected by a disc-shaped annular member 56 having an opening 57 at the center. . Further, between the adjacent large-diameter blades 60, 60, auxiliary blades 70 (FIG. 6A, four in the illustrated example) are provided upright from the annular member 56. And the large-diameter blade 60 can secure the head of the pump. The outer edges of each large-diameter blade 60 and each auxiliary blade 70 are connected by an annular flat surface 55. The position of the upper edge of the annular flat surface 55 is set lower than the positions of the upper edges of the large-diameter blade 60 and the auxiliary blade 70.
The drainage pump 1 is appropriately installed such that the suction port 42 is below the surface of the drain water collected in a drain pan (not shown). When the motor 10 is driven to rotate the rotary blade 50 (for example, in the direction of arrow R (FIG. 6A)), the drain water accumulated in the drain pan is sucked up from the suction port 42 and discharged through the pump chamber 44. It is discharged from the outlet 46.

According to the rotary blade 50 configured as described above, the water flow including bubbles generated from the drain water stirred by the rotation of the large-diameter blades 60 and the auxiliary blades 70 passes over the annular flat surface 55 and is discharged. Since the air smoothly flows to the outlet 46, the collision of bubbles with the bottom surface 35 of the cover 32 is alleviated and noise is reduced. Further, with such a configuration, when the drainage pump 1 is stopped, the water returning from the discharge port 46 to the pump chamber 44 of the housing 40 hits the annular flat surface 55 and gradually diffuses by buffering to the annular flat surface 55. Therefore, it is possible to reduce the noise caused by the return water.
Such a drainage pump is disclosed in Patent Document 1, for example.

JP 2002-13892 A

In the drainage pump of the said patent document, the fixed effect with respect to the silence of a drainage pump has been confirmed. However, the conventional rotary vane of the drainage pump is a connecting portion between the upper edge 62 and the side edge 63 of the rotary vane, as shown by arrows in FIGS. 7 (a) and 7 (c). In the vicinity of the corner A, the water flow above the rotating blades by the scraping surface (the scraping surface 61 of the large blade 60 and the scraping surface 71 of the auxiliary blade 70) which is the surface in the rotation direction of the large blade 60 and the auxiliary blade 70 ( The water is scraped into a water flow in the yz direction) and a water flow in the outer direction (flow in the xy direction), so that the surface opposite to the water scraping surface of the rotating blades (that is, the downstream side of the rotating blades), especially the rotation Since the water flow of different vectors collides in the connection portion between the upper edge portion 62 and the side edge portion 63 of the blade, that is, in the vicinity of the corner portion, the water flow is disturbed, and the surrounding air is mixed as bubbles. Slight vibrations when this bursts Sometimes noise occurs. The same applies to the auxiliary blades.
In recent years, there has been a demand for further quietness in the living room space, and further improvement in quietness has been expected in conventional drainage pumps.

  The present invention has been made in view of the above problems, and its purpose is to regulate a specific vector direction of the water flow scraped by the water scraping surfaces of the rotary blade and the auxiliary blade, and to make a water flow having the same vector component. The purpose of the present invention is to provide a drainage pump that creates and suppresses the turbulence of the water flow, prevents the mixed flow of bubbles into the water flow, and achieves quietness during further operation.

  In order to solve the above-described problems, a drainage pump according to the present invention includes a housing having a suction port at a lower end and a discharge port at a side, a rotating blade provided in the housing, and the rotating blade. A rotary pump including a plurality of radial small-diameter blades and a plurality of large-diameter blades continuously formed above the small-diameter blades. Auxiliary blades are provided between the large-diameter blades, and each of the large-diameter blade and the auxiliary blades has a water scraping surface and an upper edge portion connected to the water scraping surface at the upper edge portion of the water scraping surface. The outer edge of the water scraping surface has a side edge connected to the water scraping surface, the outer edge of the upper edge and the vicinity of the corner that is the upper edge of the side edge, Water stream scraped by the scuffing surface of the auxiliary blade Characterized in that the water flow direction regulating portion for regulating the water flow of a particular vector is formed.

  The drainage pump according to the present invention is characterized in that the water flow direction regulating portion is formed in a columnar shape and is provided in the vicinity of a corner portion on the outer peripheral side of the upper edge portion.

  The drainage pump according to the present invention is characterized in that the water flow direction regulating portion is formed in a columnar shape and is provided in the vicinity of a corner portion at an upper end of the side edge portion.

  In the drainage pump according to the present invention, the water flow direction regulating portion is formed in a streamlined column shape in which one of the bottom surfaces is a small width portion and the other is a large portion, and is provided in the vicinity of a corner portion on the outer peripheral side of the upper edge portion. It is characterized by that.

  In the drainage pump according to the present invention, the water flow direction regulating portion is formed in a streamlined column shape in which one of the bottom surfaces is a small width portion and the other is a large portion, and is provided on the outer peripheral side of the upper edge portion. It is provided over the entire length of the edge.

  According to the drainage pump of the present invention, the water swirled by the large-diameter blades is guided as a relative water flow with respect to the two directions above and to the side of the rotating blades after hitting the scraping surface of the rotating blades. However, when the water flow collides between the upper water flow and the side water flow on the back surface (that is, the downstream side) of the rotary blade, the water flow having a vector in the yz direction as shown in FIG. By aligning the water flow vector in the xy vector direction, it is possible to reduce the occurrence of turbulent flow, suppress the mixed flow of bubbles into the water flow, and further suppress the generation of noise.

It is a principal part enlarged view which shows the structure of the rotary blade used for the drainage pump in 1st Example of this invention, Comprising: (a) Top view, (b) Cross section, (c) Perspective view. It is a principal part enlarged view which shows the structure of the rotary blade used for the drainage pump in 2nd Example of this invention, Comprising: (a) Top view, (b) Sectional drawing, (c) It is a perspective view. It is a principal part enlarged view which shows the structure of the rotary blade used for the drainage pump in 3rd Example of this invention, Comprising: (a) Perspective view, (b) Top view, (c), (d), (e) It is a top view of another example. It is a principal part expansion perspective view which shows the structure of the rotary blade used for the drainage pump in 4th Example of this invention. It is a figure which shows an example of the conventional drainage pump. It is a figure which shows the rotary blade used for the conventional drainage pump, Comprising: (a) is a top view, (b) is a front view. It is a principal part enlarged view of the rotary blade shown in FIG. 6, (a) Top view, (b) Cross-sectional view, (c) Perspective view. It is a figure which shows the rotary blade of the drainage pump of 5th Example of this invention, Comprising: (a) Top view, (b) Front view, (c) It is a perspective view.

  Hereinafter, embodiments of a drainage pump according to the present invention will be described with reference to the accompanying drawings. FIG. 1 to FIG. 4 are diagrams showing the main part of the rotary blade of each embodiment of the present invention, and are equivalent to FIG. These rotary blades are attached to the output rotary shaft of the motor, and are arranged in the pump chamber of the drainage pump as shown in FIG. In FIG. 1 to FIG. 4, the same reference numerals are given to portions common to the conventional configuration.

(First embodiment)
FIG. 1 is a view showing a first embodiment of a rotary blade (large-diameter blade) used in a drainage pump according to the present invention, and FIG. 1 (a) is an enlarged plan view of the main part of the rotary blade. 1 (b) is a cross-sectional view showing the state of the rotating blade shown in FIG. 1 (a) as viewed from the upstream side of the water flow, and FIG. 1 (c) is a perspective view of the rotating blade shown in FIG. 1 (a). .

In order to drain drain water in a drain pan (not shown), a plurality of large-diameter blades 60 are provided at an equal angle on the rotary blade 50 of the drainage pump shown in FIG. A scuffing surface 61 is formed to scoop out drain water beyond 55. The water scraping surface 61 is one surface of the large diameter blade 60 in the direction in which the large diameter blade 60 rotates.
In addition, auxiliary blades (not shown in FIG. 1) as shown in FIG. 6 are arranged at equal intervals between the large-diameter blades 60 on the rotary blade 50.
An upper edge 62 is formed on the large-diameter blade 60 by connecting to the water scraping surface 61, and similarly, a side edge 63 is formed from the water scraping surface 61. The upper edge 62 is connected to the upper end of the side edge 63 by a corner A at the outer peripheral end.
Hereinafter, the configuration of the large-diameter blade 60 will be described in detail, but the auxiliary blade also has the same configuration, and detailed description thereof will not be repeated.

  As shown in FIGS. 1A to 1C, the water flow direction regulating portion 101 is formed on the outer peripheral side of the upper edge portion 62 of the large-diameter blade 60. The water flow direction restricting portion 101 is formed in a columnar shape, and stands upright from the upper edge portion 62 so as to receive a water flow on its side surface. By providing such a water flow direction restricting portion 101, when the rotary blade 50 rotates and drains the drain water in the drain pan, the water scraped by the water scraping surface 61 of the large-diameter blade 60 is controlled in the water flow direction. The current is diverted to both sides of the portion 101 and flows along the column surface (side surface of the cylinder). Thereby, the water flow flows in the xy direction without going in the z-axis direction in FIG. In other words, the z-axis component is suppressed from the water flow vector, and in this state, the water flow direction restricting portion 101 smoothly merges on the back surface (downstream side). Thus, the water flow in the yz direction scraped to the upper edge portion 62 and the xy scraped to the side edge portion 63 in the vicinity of the upper edge portion and the side edge portion of the conventional rotating blade, that is, the corner portion A of the rotating blade. The water flow in the direction is prevented from colliding in three dimensions, and the so-called two-dimensional water flow limited to the xy direction in the vicinity of the corner A is used to minimize fluctuations in the water flow vector before and after the merge. This has been achieved by reducing the generation of turbulent flow, suppressing the mixed flow of bubbles into the water flow, and further suppressing the generation of noise.

(Second embodiment)
FIG. 2 shows a rotating blade in Embodiment 2 of the present invention, FIG. 2 (a) is an enlarged plan view of the main part of the rotating blade, and FIG. 2 (b) is shown in FIG. 2 (a). It is sectional drawing which shows the state which looked at the rotary blade from the upstream of the water flow, and FIG.2 (c) is a perspective view of the rotary blade shown to Fig.2 (a). In the first embodiment, the water flow direction restricting portion 101 is provided on the outer peripheral side of the upper edge portion 62 of the large diameter blade 60. However, in this embodiment, the water flow direction restricting portion is provided above the side edge portion 63 of the large diameter blade 60. 102 is provided. Similar to the first embodiment, the water flow direction restricting portion 102 is formed in a cylindrical shape, and restricts the vector of the water flow by its column surface. The water flow scraped out by the water scraping surface 61 by such a water flow direction restriction unit 102 becomes a vector in the yz direction in which the x-axis component is suppressed and is divided up and down the water flow direction restriction unit 102, and the water flow direction restriction unit 102. Meet at the back of the. Even with such a configuration, fluctuations in the vector of the water flow in the vicinity of the corner A can be minimized.

(Third embodiment)
FIG. 3 (a) is a perspective view showing a rotary blade in the third embodiment of the present invention, and FIG. 3 (b) is a plan view of FIG. 3 (a). Instead of the water flow direction restricting portion of the first embodiment, the shape uses a water flow direction restricting portion 103 made of a columnar member having a bottom surface having a narrow width portion and a large portion and having a narrow portion and a large portion. As a result, the water flow can be regulated more smoothly than the cylindrical shape of the first embodiment, and the noise suppression effect can be enhanced. As shown in FIGS. 3 (b) to 3 (e), the water flow direction restricting portion 103 appropriately determines which of the large portion and the small width portion is disposed on the upstream side, and what inclination is disposed. Just choose.

(Fourth embodiment)
FIG. 4A is a perspective view showing a rotating blade in the fourth embodiment of the present invention. In this embodiment, the entire side edge 63 of the large-diameter blade 60 is a columnar water flow direction regulating portion 104 having a bottom eggplant type (that is, a bottom streamline type), and is integrally formed with the water scraping surface 61. The third embodiment is intended to restrict the water flow at the corner A of the large-diameter blade 60 composed of the upper edge portion 62 and the side edge portion 63, but in this embodiment, the water flow direction restriction portion 104 It is possible to restrict the vector of the water flow to a position below the side edge portion 63. With such a configuration, although the shape is complicated, higher silence than the third embodiment is realized. As in the third embodiment, the water flow direction restricting portion 104 can appropriately select which of the large portion and the small width portion is arranged on the upstream side and what kind of inclination is arranged. is there.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to said each Example, A various deformation | transformation is possible. For example, the water flow direction restricting portion in each embodiment can appropriately change the height and dimension of the bottom surface of the columnar member in accordance with the size of the rotating blade, the rotation speed, and the like. Moreover, you may comprise so that the column-shaped water flow direction control part 101 shown in 1st Example may be formed over the full length of the side edge part 63 like the water flow direction control part 104 shown in 4th Example.

(5th Example)
FIGS. 8A, 8B, and 8C show the rotary blades of the drainage pump of the fifth embodiment of the present invention. The rotary vane 50 of the drainage pump shown in FIG. 8 is provided with a large-diameter vane 60 that is continuous with a plurality of small-diameter vanes 54 that drain the drain water in the drain pan. A scooping surface 61 for scooping out drain water is formed beyond the annular flat surface 55 of the disc-shaped annular member 56, and a stepped portion 72 is formed on the upper end edge 77 of the edge of the large-diameter blade 60. The outer end edge portion 81 is provided with a stepped portion 82. As a result, upper edge edge scraping surfaces 75A and 75B are formed as wall surfaces rising from the stepped portion 72 to the upper edge part 77. Further, an outer edge scooping surface 85 is formed as a wall surface rising from the step portion 82 toward the outer edge 81. A water flow direction restricting portion 100 that is slightly higher than the height of the large-diameter blade 60 is formed at the outer edge 81.

  Further, in the fifth embodiment, not only the large-diameter blade 60 but also the auxiliary blade 70 is formed with a scraping surface 71 on the front surface in the rotational direction, and a stepped portion 74 is formed on the upper edge 73 thereof. A stepped portion 84 is formed on the outer edge 83. Further, an upper edge edge scraping surface 76 is formed as a wall surface rising from the step portion 74 to the upper edge portion 73, and an outer edge edge water scraping surface 86 is formed as a wall surface rising from the step portion 84 to the outer edge portion 83. Yes. The outer end edge 83 is formed with a water flow direction restricting portion 100 that is slightly higher than the height of the auxiliary blade 70, similarly to the outer end edge 81 of the large-diameter blade 60.

  In the fifth embodiment, the step portions 72 and 74 are formed over the entire length of the upper end edge portions 77 and 73 of the large-diameter blades 60 and the auxiliary blades 70. Accordingly, the step portions 72 and 74 have an effect of repelling the water flow of the drain water upward and guiding it upward and outward from each large-diameter blade 60 and each auxiliary blade 70. Further, the step portions 82 and 84 are formed over the entire length of the outer end edge portions 81 and 83 of each large-diameter blade 60 and each auxiliary blade 70. Thereby, the step portions 82 and 84 have an effect of repelling the flow of the drain water outward and guiding it outward of each large-diameter blade 60 and each auxiliary blade 70.

  In the drainage pump of the fifth embodiment of the present invention, in addition to the effect of noise reduction by the water flow direction regulating portion described in the other embodiments, the water swirled by the large-diameter blade hits the scraping surface of the rotary blade, The water flows relative to the rotating blades and is guided to the upper edge watering surface and the outer edge watering surface, and the water flow is incident on the upper edge watering surface and the outer edge watering surface. The direction can be set to substantially the same angle as the incident angle of running water to the scraping surface of the rotary blade. As a result, the relative water flow before and after the guide part formed in the step shape of the rotary blade becomes uniform, the generation of turbulence is reduced, the mixed flow of bubbles into the water flow is suppressed, and the generation of noise is further suppressed. Is possible. Further, at that time, a more uniform relative water flow is achieved by forming the scooping surface of the large-diameter blade and the scooping surface of the upper edge portion or the scooping surface of the outer edge portion with a continuous curved surface with a predetermined curvature. It is possible. Thus, in the drainage pump of the fifth embodiment, it is possible to achieve a higher noise reduction effect.

DESCRIPTION OF SYMBOLS 10 Motor 12 Drive shaft 40 Housing 42 Suction port 46 Discharge port 50 Rotary blade 52 Shaft part 54 Small diameter blade 55 Annular flat surface 56 Annular member 60 Large diameter blade 61 Scrape surface (large diameter blade)
62 Upper edge (large diameter blade)
63 Side edge (large diameter blade)
A corner (large diameter blade)
70 Auxiliary blades 71 Scrape surface (auxiliary blades)
100, 101-104 Water flow direction regulation part

Claims (5)

A drainage pump comprising a housing having a suction port at a lower end and a discharge port at a side, a rotating blade provided in the housing, and a motor for rotating the rotating blade,
The rotary blade includes a plurality of radial small-diameter blades and a plurality of large-diameter blades formed continuously above the small-diameter blade,
In addition, auxiliary blades are provided between the large-diameter blades.
Each of the large-diameter blade and the auxiliary blade has a water scraping surface, an upper edge portion connected to the water scraping surface, and a side edge portion similarly connected to the water scraping surface,
A drainage pump characterized in that a water flow direction regulating portion is formed in the vicinity of a corner portion which is an outer peripheral end of the upper edge portion and an upper end of the side edge portion.   The drainage pump according to claim 1, wherein the water flow direction restricting portion is formed in a columnar shape and provided on an outer peripheral side of the upper edge portion.   The drainage pump according to claim 1, wherein the water flow direction restricting portion is formed in a columnar shape and provided at an upper end of the side edge portion.   2. The drainage pump according to claim 1, wherein the water flow direction restricting portion is formed in a columnar shape having a bottom surface having a narrow portion and a large portion, and is provided on an outer peripheral side of the upper edge portion.   The water flow direction restricting portion is formed in a streamlined shape having a bottom surface having a narrow portion and a large portion, provided on the outer peripheral side of the upper edge portion, and provided over the entire length of the side edge portion. The drainage pump according to claim 1.

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