KR102311191B1 - Drain pump - Google Patents

Abstract

The present invention provides a drain pump with further improvement in quietness during operation, wherein the rotary blade 50 used in the drain pump 1 is radially from the shaft 52 connected to the output shaft of the motor. A large-diameter wing 60 having a water piercing surface 110 formed in a plurality of elongated plate shapes, a plurality of plate-shaped small-diameter wing 54 connected to the lower edge of the large-diameter wing 60, and a water piercing surface 111 and an auxiliary blade 68 provided between the adjacent large-diameter blades 60 . The upper and outer edge portions of the large-diameter blade 60 and the auxiliary blade 68 are provided with ends 72, 74 and 82, 84 for guiding the water flow that the blade moves toward the upper and outer sides of the blade, The upper edge water intercepts 75 and 76 are formed by inclining at a predetermined angle with respect to the water intervening surfaces 110 and 111, and thereby the incident angle of flowing water with respect to the water intervening surfaces 110 and 111, and the upper edge water The incident angles of the flowing water with respect to the intermittent surfaces 75 and 76 and the outer edge water intervening surfaces 85 and 86 are almost the same.

Description

Drain Pump{DRAIN PUMP}

The present invention relates to a drain pump for draining drain water from a drain pan that receives water condensed in an indoor heat exchanger of an air conditioner to the outside.

BACKGROUND ART Conventionally, in an air conditioner of a type embedded in an indoor ceiling, a drain pan for receiving drain water condensed on the surface of an indoor heat exchanger of the air conditioner is equipped. In order to drain the drain water in this drain pan to the outdoors, a drain pump (drain pump) is used.

Hereinafter, the present invention will be described in relation to a drain pump (Patent Document 2) used in an air conditioner that has already been applied and published by the applicant of the present application. Fig. 11 is a front view showing a part of a drain pump described as a prior art in Patent Document 2, in a cutaway view, and Fig. 12 (a) is a plan view of an example of a rotary blade used for the drain pump shown in Fig. 12(b) is a front view of the rotary blade shown in FIG. 12(a).

In the following description, in principle, components common to the present invention will be described using the same reference numerals as those used in Patent Document 2. In addition, in this specification, terms such as "upper side", "lower side" and "inside" and "outside" define a relative relationship with each other on the basis of the positional relationship shown in the drawings for ease of understanding of the description. , does not have any meaning as an absolute direction.

The drain pump, which is denoted by reference numeral 1 as a whole, includes a motor 10 and a pump body 30 attached to the motor 10 via a bracket 20 . The pump body 30 is made of plastic, and includes a housing 40 having an open upper portion and a cover 32 covering the upper opening of the housing 40 . The housing 40 has a pipe-shaped suction port 42 having an opening 43 at its lower end, a pump chamber 44 formed therein, and a discharge port 46 protruding laterally. The cover 32 is integrally formed with the bracket 20 and is connected to the housing 40 with the seal member 34 sandwiched therebetween.

In the pump chamber 44 of the housing 40 , the rotary blade 50 rotated by the motor 10 is accommodated. The rotary blade 50 includes a shaft portion 52, a plurality of (four in the example shown) flat plate-shaped large-diameter blades 60 extending in the radial direction from the outer periphery of the shaft portion 52, and each large-diameter blade 60. It has a plurality of flat plate-shaped small-diameter blades 54 inserted into the suction port 42 while being connected to the lower edge of the blade (four large-diameter blades 60 and the same number).

The shaft portion 52 protrudes toward the motor 10 through a through hole 36 formed in the center of the cover 32 , and the motor 10 is provided in a hole 53 provided along the central axis of the shaft portion 52 . of the drive shaft 12 is inserted and fixed. On the upper surface of the shaft part 52, a water-receiving disk 14 is attached, and the water-receiving disk 14 has a motor even if drain water is ejected from the through-hole 36 of the cover 32. (10) Prevents scattering to the side.

A lower end edge of each large-diameter blade 60 is formed in a tapered shape inclined downward toward the inner diameter side, and each of these lower end edges is a disk-shaped annular having an opening 63 in the center. ) is connected by a member 62 . Further, between the adjacent large-diameter blades 60 and 60, auxiliary blades 68 (Fig. 12(a), 4 in the example of the illustration) are provided standing up from the annular member 62, and the auxiliary blades ( 68) and the large-diameter blades 60 can ensure the lift of the pump. An outer edge of each large-diameter blade 60 and each auxiliary blade 68 is connected by a ring-shaped wall member 64 . The position of the upper edge of the ring-shaped wall member 64 is lower than the position of the upper edge of the large-diameter blade 60 and the auxiliary blade 68 .

According to the rotary vane 50 configured as described above, the water flow including air bubbles generated from the drain water by being disturbed by the rotation of the large-diameter vane 60 passes over the ring-shaped wall member 64 . Since it flows smoothly to the discharge port 46, the collision of the bubble to the bottom surface 35 of the cover 32 is relieved, and the effect of reducing a noise is anticipated. In addition, with such a configuration, when the drain pump 1 is stopped, water returning from the discharge port 46 to the pump chamber 44 of the housing 40 collides with the ring-shaped wall member 64 , Since it diffuses gradually by the buffering to the shape wall member 64, reduction of the noise resulting from the return water is also expected.

In this way, the applicant of the present application has already applied for and disclosed a patent relating to a configuration enabling reduction of noise from a drain pump.

In patent document 1, it is making it a subject to aim at reduction of the water splashing sound of the drain pump equipped with an air conditioner. The rotary blade has a shaft portion, and the output shaft of the electric motor is inserted into a hole at the bottom of the shaft portion. The plate-shaped large-diameter blade extending in the radial direction from the shaft is connected to a cylindrical ring member on the outer peripheral side. In the rotary vane of the embodiment, the upper end of the ring member is formed as a thin portion, and is connected to the plate-shaped member through the connecting portion.

Patent document 2 further improves the rotary blade shown in patent document 1. In Patent Document 2, a rotary blade used for a drain pump includes a plurality of plate-shaped large-diameter blades extending in a radial direction from a shaft connected to an output shaft of a motor, a plurality of plate-shaped small-diameter blades connected to the lower edge of the large-diameter blade, and neighboring It has auxiliary wings provided between the large diameter wings. On the outer periphery of the large-diameter blade and the auxiliary blade, an end portion is provided for guiding the water flow that the blade travels toward the outside of the blade. Since it can suppress that drain water flows into the space behind a blade|wing by these edge parts, even if it improves discharge capability, a vibration and a noise can be suppressed.

Patent Document 1: Japanese Patent Laid-Open No. 2006-29214 Patent Document 2: Japanese Patent Laid-Open No. 2013-64396

In the drain pump of each of the above patent documents, a certain effect on the quietness of the drain pump is confirmed. In particular, if the invention described in Patent Document 2 is re-verified, the effect of providing the end portion as the guide portion is sufficiently achieved. And this invention pursues a further improvement technique, premised on providing the edge part as a guide part.

As described in Patent Document 2, when re-verification of the invention in which the rotary blade 50 has an upper end portion and an outer end portion formed thereon, as shown in FIGS. 6 and 7, the large-diameter blade 60 and the auxiliary Step-shaped guide portions 72, 74 and 82, 84 are provided on the upper edge portions 71 and 73 and the outer edge portions 81 and 83 of the blade 68, respectively. is the composition At this time, the large-diameter blade 60 and the auxiliary blade 68 pass through the drain water to generate a water flow. It will be described below as "water immersion surface". That is, the large-diameter blade 60 forms a water access surface 110 , an upper end end water access surface 75 , and an outer end edge water access surface 85 , and the auxiliary wing 68 is a water access surface (111), the upper edge edge water access surface 76, and the outer edge edge water access surface 86 is formed.

By the rotational driving of the rotary blade 50, the drain water is pumped up by the small-diameter blade 54, a further centrifugal force is given by the large-diameter blade 60 and the auxiliary blade 68, and the annular flat surface 164 ) and discharged from the discharge port 46 . At that time, the relative running water Fa1 is generated by the water interfacing surface 110 of the large-diameter blade 60 and the water interfacing surface 111 of the auxiliary wing 68 intercepting the water (FIG. 7). In FIG. 7 , the flowing water Fa1 and Fa2 indicated by the arrows indicate the relative direction (incident angle) and flow velocity of the inflow of water that is traversed by the rotation with respect to each water intervening surface of the rotary blade 50 . Then, the ends 72 and 74 of the large-diameter blade 60 and the auxiliary blade 68 serve to pump the drain water upward and guide it upward and outward. That is, the end portions 72 and 74 of the large-diameter blade 60 and the auxiliary blade 68 represent the drain water as indicated by the flowing water F (the dashed-dotted line in Fig. 7(a)). It acts to guide in the upward direction of Further, the end portions 82 and 84 are formed in the outer edge portions 81 and 83 of the large-diameter blade 60 and the auxiliary blade 68 . Thereby, the ends 82 and 84 serve to guide the drain water outward in the radial direction of the rotary blade 50 .

In this way, by the synergistic action of the ends 72, 74, 82, and 84 of the large-diameter blade 60 and the auxiliary blade 68, the water flow expands upward and by the flow, the state of the gas-liquid interface of the drain water is changed. From the conventional state, it becomes a state that is dome-shaped outwardly inflated, and because it extends over the outer end of the large-diameter blade, it is difficult for water flow to flow into the space upstream of the next large-diameter blade or auxiliary blade, and air bubbles are mixed. ), which can reduce vibration and noise.

Although the above structure achieves a considerable effect in the quiet effect, in the invention of Patent Document 2, the water penetration surface of the rotary blade (large-diameter blade 60 and auxiliary blade 68) (large-diameter blade 60) ) of the water access surface 110 and the water surface 111 of the auxiliary wing 68), and the water surface (75, 85 and 76 to be described later) of the ends 72, 82 and 74, 84 as guides. 86), because the relative angle of incidence of flowing water is different, confusion occurs in the water flow, the surrounding air becomes bubbles and mixes, and when this is ruptured, some vibration or noise may occur.

The present invention has been made in view of the above problems, and its object is to suppress the disturbance of the water flow by making the relative incidence angle of the flowing water between the water intervening surface of the rotary blade and the water intervening surface of the end (guide) equal. It is an object of the present invention to provide a drainage pump that prevents mixing of air bubbles into a water stream and achieves further quietness during operation.

In order to solve the above problems, a drainage pump according to the present invention is a drainage pump that accommodates a rotary blade rotatably supported in a housing provided with a suction port at a lower end and a discharge port at a side, wherein the rotary blade includes a plurality of A radially small-diameter blade and a plurality of large-diameter blades continuously formed above the small-diameter blade are provided, and an upper end edge water surface or an outer edge surface is formed in a short shape on the water surface side of the large-diameter blade. And it is characterized in that the angle of incidence of running water touching the water surface of the large-diameter blade is configured to be equal to the incident angle of the running water contacting the upper end water surface or the outer edge water surface.

In addition, the drainage pump according to the present invention is characterized in that, on the water access surface side of the large-diameter blade, an upper end edge part water hole surface and an outer edge part water hole surface are formed in a short shape.

In addition, the drain pump according to the present invention is configured such that the angle of incidence of running water contacting the upper edge or the outer edge of the water is equal to the angle of incidence of running water contacting the water access of the large-diameter blade. are doing

In addition, the drainage pump according to the present invention is characterized in that the upper end edge water access surface formed in a single shape on the water access surface side of the large-diameter blade is constituted by a plurality of water access surfaces in the circumferential direction. .

In addition, the drainage pump according to the present invention is characterized in that the water interception surface of the large-diameter blade and the upper end edge water penetration surface or the outer edge water penetration surface are formed as a continuous curved surface with a predetermined curvature, have.

According to the drain pump of the present invention, after the large-diameter blade hits the water surface of the rotary blade, it becomes a relative water flow with respect to the rotary blade and is guided to the upper edge water surface and the outer edge water surface. , It is possible to make the incident direction of the flowing water to the upper end edge water access surface and the outer edge part water access surface to be substantially the same as the incident angle of the running water to the water access surface of the rotary blade. Thereby, the relative water flow in front and back of the guide part formed in the step shape of a rotary blade becomes uniform, and it becomes possible to reduce generation|occurrence|production of a turbulence, suppress the mixing of air bubble to a water flow, and suppress generation|occurrence|production of a noise more. In addition, at that time, by forming the water penetration surface of the large-diameter blade and the upper edge part water penetration surface or the outer edge part water penetration surface into a curved surface that is continuous with a predetermined curvature, the edge of the blade is rounded, and the flow is peeled off. By suppressing , it is possible to suppress the generation of air bubbles to further reduce the generation of noise, and to achieve a more uniform relative water flow.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing the configuration of a rotary blade used for a drain pump in a first embodiment of the present invention.
Fig. 2 is a plan view of the rotary blade shown in Fig. 1;
Fig. 3 is a front view of the rotary blade shown in Fig. 1;
Fig. 4 is a bottom view of the rotary blade shown in Fig. 1;
Fig. 5 is an enlarged plan view of only one large-diameter blade for explaining the detailed structure of the large-diameter blade of the rotary blade used for the drainage pump in the first embodiment of the present invention;
6 is a perspective view for comparing and explaining a drain pump having a rotary blade having a guide part formed as a premise of the present invention and the present invention.
Fig. 7 is an enlarged view of only one large-diameter blade for explaining the detailed structure of a large-diameter blade of a rotary blade used in a drainage pump having a rotary blade having a guide part formed as a premise of the present invention;
Fig. 8 is an explanatory view comparing the water flow between a rotary blade provided with a guide, which is a premise of the present invention, and a rotary blade used for the drain pump in the first embodiment of the present invention;
Fig. 9 is an enlarged plan view of only one large-diameter blade for explaining the detailed structure of the large-diameter blade of the rotary blade used for the drainage pump in the second embodiment of the present invention.
Fig. 10 is a graph comparing the magnitude of noise (sound pressure level) in each frequency band between a rotary blade used for a drain pump in a conventional example and a first embodiment;
Fig. 11 is a schematic configuration diagram showing an example of a conventional drain pump;
12 is a view showing a rotary blade used in a conventional drainage pump, (a) is a plan view, (b) is a front view.
Fig. 13 is a plan view showing the configuration of a rotary blade used for a drain pump in a third embodiment of the present invention;
Fig. 14 is a perspective view showing the configuration of a rotary blade used for a drain pump in a third embodiment of the present invention;
Fig. 15 is a sectional view of a principal part showing the configuration of a rotary vane used for a drain pump in accordance with a third embodiment of the present invention, (a) a sectional view taken along the AA plane in Fig. 13, and (b) a sectional view taken on the BB plane in Fig. 14 . Cross-section.

Hereinafter, an embodiment of a drain pump according to the present invention will be described based on the accompanying drawings. 1 to 5 and 8 (b), 9 and 13 to 15 show an embodiment of the present invention. 11 and 12 show the structure of the conventional rotary blade, and FIGS. 6, 7 and 8 (a) show the structure of the rotary blade provided with the guide part as a premise of this invention. In the following description, the same code|symbol is attached|subjected to the part common to the conventional rotary blade or the rotary blade provided with the guide part.

(Example 1)

1 to 5 are views showing a first embodiment of a rotary blade used for a drain pump in the present invention, FIG. 1 is a perspective view showing the entire rotary blade, and FIG. 2 is shown in FIG. Fig. 3 is a front view of the rotor shown in Fig. 1, Fig. 4 is a bottom view of the rotor shown in Fig. 1, and Fig. 5 is a detailed structure of one large-diameter blade among the rotor blades. is a plan view showing In the description of the embodiment of the present invention, the same reference numerals are attached to the structures common to the conventional rotor blades shown in the rotary blades provided with a guide part (FIGS. 6 and 7) premised by the present invention by attaching the same reference numerals. A description is omitted.

The rotary blade 50 of the drain pump 1 shown in Fig. 1 is provided with a large-diameter blade 60 continuous to a plurality of small-diameter blades 54 for draining the drain water in the drain pan, and the large-diameter blade 60 ) forms, on the entire surface in the rotational direction, a water penetration surface 110 for passing drain water over the annular flat surface 164 of the disk-shaped annular member 62, and the edge of the large-diameter blade 60 The upper end portion 71 is provided with an end portion 72 , and the outer end portion 81 is provided with an end portion 82 . Thereby, the upper edge part water penetration surfaces 75A, 75B are formed as a wall surface erected on the upper edge part 71 from the edge part 72. As shown in FIG. In addition, as a wall surface erected in the direction of the outer edge portion 81 from the end portion 82 , the outer edge portion water penetration surface 85 is formed. In this first embodiment, the upper end edge water piercing surfaces 75A and 75B made of two discontinuous surfaces are formed. The detailed structure and function of this upper edge part water penetration surface 75A, 75B is mentioned later.

In addition, in the first embodiment, not only the large-diameter blade 60, but also the auxiliary blade 68, a water penetration surface 111 is formed on the entire surface in the rotational direction, and the upper end portion 73 has an end portion 74. is formed, and an end portion 84 is formed at the outer edge portion 83 . In addition, an upper edge piercing surface 76 is formed as a wall surface erected on the upper edge portion 73 from the edge portion 74 , and an outer edge portion is formed as a wall surface erected on the outer edge portion 83 from the edge portion 84 . A water penetration surface 86 is formed.

In the first embodiment, the ends 72 and 74 are formed over the entire length of the upper edge portions 71 and 73 of each of the large-diameter blades 60 and each of the auxiliary blades 68 . As a result, the ends 72 and 74 serve to spur up the flow of drain water upward and guide the large-diameter blades 60 and the auxiliary blades 68 upward and outward. Further, the end portions 82 and 84 are formed over the entire length of the outer edge portions 81 and 83 of each large-diameter blade 60 and each auxiliary blade 68 . As a result, the end portions 82 and 84 serve to spur the drain water outward and guide the large-diameter blades 60 and the auxiliary blades 68 outward. Hereinafter, the first embodiment will be described in relation to the large-diameter blade 60, but needless to say, the same configuration is also applicable to the auxiliary blade 68 as the configuration.

5 : is an enlarged plan view which shows the detailed structure of the large diameter blade|wing 60 of 1 sheet of the rotary blade 50 shown in FIG. 1 of 1st Embodiment. Conventionally, in the rotary blade 50, in consideration of the manufacturing process and durability, the large diameter blade 60 and the auxiliary blade 68 are formed to have a corresponding thickness, and the central portion thereof is the center of rotation of the shaft portion 52. It is normal to configure so that the central line X1 from the phosphorus central axis O passes (Fig. 12, Fig. 7(b) and Fig. 8(a)). Thereby, the upper edge part 71 and the edge part 72 can form the plate|board thickness t1, t2 of the radial direction at the outer edge part of the rotary blade 60 with substantially the same width (FIG. 5 and FIG. 7(b)). That is, by setting the relationship of "plate thickness t1 of the end 72" ≒ "plate thickness t2 of the upper end edge 71", the central portion of the large-diameter blade 60 and the auxiliary blade 68 is It is common to configure so that the center line X1 from the central axis O, which is the center of rotation of the shaft portion 52, passes.

When such a rotary blade 50 is rotated to dislodge the drain water, it is scooped up by the small-diameter blade 54, and a centrifugal force is applied to the drain water on the water penetration surface 110 of the large-diameter blade 60 again. It becomes a water flow, and the water flow is pushed outward in the radial direction of the rotor blade 50 over the annular flat surface 164 of the disk-shaped annular member 62. As shown in FIG. In addition, in the first embodiment, each of the two discontinuous upper edge water intervening surfaces 75A and 75B is formed by inclining at a predetermined angle with respect to the water interfering surface 110 of the large-diameter blade 60, The angle of incidence on the plane of the relative flowing water Fb1 with respect to the water intervening surface 110 and the plane incident angle of the relative flowing water Fb2 with respect to the upper end edge water intervening surfaces 75A and 75B are approximately the same. There is (Fig. 5 and Fig. 8(b)).

Here, using Fig. 7 and Fig. 8 (a) (b), the large-diameter vane 60 of the rotary vane 50 provided with the guide part which the present invention shown in Fig. 6 assumes, and the 1st of this invention Differences in water flow generation in the large-diameter blades 60 in the Examples are compared and described. 7 (a) and (b), the flow of the drain water with respect to the water access surface 110 and the upper edge part water access surface 75 of the large-diameter blade 60 having a guide part premised by the present invention. The directions of the incident angles are indicated by arrows Fa1 and Fa2. 8(a) and (b) show the generation of water flow of the large-diameter blade 60 provided with the guide part premised by the present invention, and the large-diameter blade 60 in the first embodiment of the present invention. It is explanatory drawing for demonstrating the difference of generation|occurrence|production of a water flow.

First, in the relative running water F (dotted-dotted line) as shown in FIG. A case in which the large-diameter blades 60 formed in parallel are used will be considered. Here, the overall water flow is indicated as flowing water (F) by a dashed-dotted line, and the water flow touching the water interfacing surface 110 of the large-diameter blade 60 is flowing water Fa1, and the upper edge of the large-diameter blade 60 is water flow. The water flow which hits the sleep surface 75 is displayed as flowing water Fa2. In this case, the incidence angles of the respective flowing water Fa1 and Fa2 are examined in detail.

Since the large-diameter blade 60 rotates about the center O of the shaft 52, the flowing water F traversed thereby flows in the cylindrical shape shown by the dotted line in FIG. Then, as shown in Fig. 8(a), the flowing water incident angle β of the flowing water Fa2 with respect to the upper end edge water access surface 75 of the large-diameter blade 60 is the upper edge water access surface 75 ) is approximately 90 degrees because it is on the plane containing the centerline X1 centered at the center O of the axis 52 . However, the flowing water incident angle α of the flowing water Fa1 with respect to the water penetration surface 110 of the large-diameter blade 60 is about a plane including the center line X3 centered on the center O of the axis 52. Although it becomes almost a right angle, the incident angle of the drain water relative to the water penetration surface 110 of the large-diameter blade 60 becomes the flowing water incident angle α, which is different from the incident angle β of the flowing water Fa2. Specifically, the water entry angle α with respect to the water access surface 110 pushed forward with respect to the upper edge water access surface 75 on the surface including the center line X1 is the upper edge water access surface It is an acute angle rather than the flowing-water standing angle (beta) with respect to (75). That is, it exists in the relationship of "flow incident angle α of flowing water Fa1” <“flow incidence angle β of flowing water Fa2”. At this time, when the flowing water F passed through the end 72 of the large-diameter blade 60 is passed upward from the upper end 71 again, the incident angle of the flowing water F to the water intervening surface is different. Therefore, when the vector of the flowing water F changes, turbulence occurs, which causes air bubbles to flow and become a cause of noise.

Assuming the operation and effect of such a guide part (end part), the structure of the large diameter blade|wing 60 in the 1st embodiment of this invention, and its operation effect are demonstrated with reference to FIG.8(b). The large-diameter blade 60 of the first embodiment shown in Fig. 8(b) has the center of its plate thickness on the plane including the center line X1 centered on the center O of the shaft 52. Consists of. The reason is the uniformity of rotation of the rotary blade 50. In addition, in order not to cause confusion of the flowing water F shown in Fig. 8(a), in the first embodiment of the present invention, the "flow incident angle α of the flowing water Fa1" ≒ "the flow rate Fa2" In order to achieve the relationship of the flowing water incident angle (beta)", the angle of the upper edge part water penetration surface 75 (75A, 75B) with respect to the flowing water F is slightly inclined. In this way, by forming the upper edge water access surface 75 inclined at a predetermined angle with respect to the water access surface 110B, the relative running water incident angle Fb1 and the upper edge water access surface (Fb1) with respect to the water access surface 110 ( It becomes possible to make the relative incident angle Fb2 with respect to 75A to be substantially the same incident angle. As a result, the flow F of the drain water flowing out from the end 72 to the upper edge 71 is not disturbed and the direction of the flow can be maintained, and the occurrence of turbulence is suppressed to prevent bubbles from flowing into the water flow. can be reduced.

Fig. 10 is a graph comparing the noise (sound pressure level) of the drain pump using the rotary vane according to the first embodiment of the present invention and the drain pump using the conventional rotary vane. The graph shows the number of revolutions on the abscissa axis and the noise level on the ordinate axis, wherein the broken line represents the conventional one, and the solid line represents the present invention. As this graph shows, it was confirmed that the noise reduction effect was remarkably exhibited in the low-frequency noise region and the high-frequency noise region.

Also, in the first embodiment of the present invention, the number (ie, the second In the first embodiment, the two of 75A and 75B) and the angle of inclining the upper edge portion of the water penetration surface 75, etc., are the dimensions of each rotary blade (large diameter blade 60 and auxiliary blade 68) in the radial direction and It is necessary to change suitably according to thickness. For example, as the top view of FIG. 2 shows, the upper edge part water penetration surface 75 of the large-diameter blade 60 in the first embodiment of the present invention is near the center of the large-diameter blade 60. It is formed in two stages 75A and 75B in the circumferential direction, but this is the case where each of the upper edge parts 75A and 75B is formed as the same plane by one upper edge part water part 75. As it goes from the outer periphery toward the center, a plate thickness exceeding the water penetration surface 110 of the large-diameter blade 60 shown in FIG. Because it needs to be formed to have it. This is not preferable from the viewpoint of the operation of the rotary blade or the manufacturing cost. Therefore, even if the upper end edge part water gap 75 is inclined, the overall thickness of the rotary blade 60 can be suppressed by appropriately dividing the upper edge part water gap 75 by dividing it (75A, 75B) and forming it. have.

In addition, in accordance with the incidence angle (flow incidence angle α) of the relative flow Fb1 to the water penetration surface 110 of the large-diameter blade 60 shown in FIG. In order to equalize the incident angle (flow incident angle α) of the flowing water Fb2, the water penetration surface 110 of the large-diameter blade 60 is a center line X1 centered on the center O of the axis 52. Since it is placed in a state pushed out by the plate thickness t1 of the step 75A, it is t1 more than the center line X2 centered on the center O of the shaft 52 in 75A of the upper end edge part. It is necessary to leave it in a pushed state as much as (the push-out part of the water repelling surface 110). By forming the upper edge water access surface 75 surface to satisfy this relationship, the inclination angle of the upper edge water access surface 75 (75A, 75B) is determined. In this case, if the upper edge water access surfaces 75, 75A, 75B are formed on a plane parallel to the center line X2 centered on the center O of the axis 52, the upper edge water access surfaces ( 75) (75A, 75B) is arranged at a position parallel to the center line X2 and advanced forward by t1. When the upper end edge part water penetration surface 75A, 75B is formed by two steps, it is the same also about the upper edge edge part water penetration surface 75B. Usually, each of the upper end edge water gaps 75A, 75B is formed as a parallel surface, and in accordance with the diameter of the rotary blade 50, one to several steps of upper edge water access surfaces are formed. You may form suitably.

The inclination of 75A of this upper edge part water access surface is continuously formed as one inclined surface also in the outer edge part water access surface 85. As shown in FIG. In addition, an inclined surface is formed in the same way of thinking about the upper edge part water penetration surface 76 and the outer edge part water penetration surface 86 of the auxiliary wing 68 .

(Example 2)

9 is a partially enlarged plan view of one large-diameter blade 60 of the second embodiment of the rotary blade 50 used in the drain pump 1 of the present invention. In the first embodiment, in order to match the angle of incidence of the flowing water Fb1 with respect to the water intercept 110 to the incident angle of the flowing water Fb2 with respect to the upper edge portion water interfering surface 75, in the water interception surface 110 It was formed by inclining the upper edge of the water immersion surface (75A and 75B). However, in the second embodiment, conversely, in order to match the angle of incidence of the flowing water Fb2 with respect to the upper edge portion 75 and the incident angle of the flowing water Fb1 with respect to the water intervening surface 110 , the axis 52 ) including the center line (X1) centered on the center of rotation (O) and on the surface including the axis of rotation of the rotary blade 50, if configured so that the upper end edge water hemming surface 75 is located similarly, The interstitial surface 110 is constituted by a plurality of water intermittent surfaces 110A and 110B, and each water intervening surface 110A, 110B is formed by inclining. And at that time, it was comprised so that each water piercing surface 110A, 110B may exist on the surface containing the center line X4 or X5 centering on the center O of the axis 52. As shown in FIG. As a result, as in the first embodiment, it is possible to equalize the standing of the relative running water in the water barriers 110A and B and the upper edge water barrier 75, and achieving the same effect as in the first embodiment it becomes possible In the case of this second embodiment, the water access surfaces 110A, B and the upper edge portion water access surface 75 are the center lines X1, X4, X5 with the center O of the axis 52 as the center. Since it is on a plane including , it can be configured so that the incident angle of the relative flowing water (Fc1 and Fc2) is approximately a right angle in any plane.

(Example 3)

Fig. 13 is a plan view showing a third embodiment of the rotary vane 50 used in the drain pump of the present invention. As shown in FIG. 13 , the guide portion 82 as an end provided on the outer peripheral side of the large-diameter blade 60 , the outer edge end 81 , and the guide portion 84 as an end provided on the outer peripheral side of the auxiliary blade 68 . , the outer edge end 83 has a predetermined curvature and is formed to be round. That is, the rotary blade 50 shown in the third embodiment is the large-diameter blade 60 and the auxiliary from the water piercing surfaces 110 and 111 to the outer edge ends 81 and 83 via the guide portions 82 and 84 . It is formed so that the surface of the blade|wing 68 may become smooth compared with Example 1 and Example 2. As shown in FIG.

Fig. 15(a) is a large-diameter blade 60 shown in Fig. 13, and is a cross-sectional view taken along the plane A-A. Similarly to the guide part 82 and the outer edge edge part 81 mentioned above, the predetermined curvature R1 also about the shape from the water penetration surface 110 to the upper edge part 71 via the edge part 72. , R2) is gently formed. Although not shown in particular, the auxiliary blade 68 is also gently formed with predetermined curvatures R1 and R2. In addition, the upper edge 71 of the large-diameter blade 60 is not curved with a predetermined curvature, but it is also possible to form gently with a predetermined curvature R3 in this portion as well.

Since the corner part (edge) is rounded by such a structure, peeling of the water flow which arises by this at a corner part can be suppressed. Therefore, it is possible to suppress the generation of bubbles generated in the peeling oil occurring on the water immersion surface, the guide portion, and the outer edge end, and reduce the noise.

In addition, 75 C of boundaries with upper edge part water penetration surfaces 75A and 75B are, as is clear from FIG. 13, in planar view, along the circular opening 63 of the annular member 62. is formed That is, the boundary 75C is formed so as to overlap the circular opening 63 in plan view. In addition, the boundary 75C and the upper edge part water intervening surface 75B are formed so as to have a predetermined curvature and become a continuous surface. Thereby, the angle of incidence of the water flow pierced by 75A of upper edge part water penetration surfaces in the vicinity of the boundary 75C can be gently changed.

Fig. 15(b) is a cross-sectional view of the small-diameter blade 54 in the B-B plane of the rotary blade 50 shown in Fig. 14 . By forming the small-diameter blade 54 gently with a predetermined curvature similarly to the large-diameter blade 60 and the auxiliary blade 68, it is possible to suppress the generation of bubbles generated by the separation of the water stream and reduce noise.

In addition, the present invention is not limited to each of the above-described embodiments, and various modifications are possible. For example, in the first, second, and third embodiments, it is assumed that guide portions are provided on both the large-diameter blades and the auxiliary blades. In addition, the incident angle of the flowing water on the water intercept 110 of the large-diameter wing 60 and the incident angle of the flowing water on the upper edge water intercept 75 of the large-diameter wing 60 are substantially the same incident angle, It goes without saying that various modifications can be made to each of the above-described embodiments without departing from the gist of the present invention that any one is inclined at a desired angle.

10: motor 12: drive shaft
40: housing 42: intake port
46: outlet 52: shaft
54: small diameter wing 60: large diameter wing
62: annular member 68: auxiliary wing
50: rotary wing
72, 82: end (guide) (large diameter wing)
75, 75A, 75B, 76: the upper edge of the water immersion surface
74, 84: end (guide) (auxiliary wing)
85, 86: water piercing surface at the outer edge
110, 110A, 110B: Water immersion surface (large diameter wing)
111: water surface (secondary wing)
164: annular flat surface

Claims (5)

A drain pump accommodating a rotary blade rotatably supported in a housing provided with a suction port at the lower end and a discharge port at the side, comprising:
The rotary blade includes a plurality of radial small-diameter blades, and a plurality of large-diameter blades continuously formed above the small-diameter blade, and an upper edge portion (端緣部) forming a water penetration surface or an outer edge part water penetration surface,
The upper edge part of the water hemming surface is formed to be inclined at a predetermined angle with respect to the water hemming surface of the large-diameter wing,
Drain pump, characterized in that the incident angle of the running water contacting the water access surface of the large-diameter blade is equal to the incident angle of the running water contacting the upper edge water access surface or the outer edge water access surface. According to claim 1,
Drain pump, characterized in that on the side of the water access surface of the large-diameter blade, an upper edge part water penetration surface and an outer edge part water penetration surface are formed in a short shape. 3. The method of claim 1 or 2,
Drain pump, characterized in that the upper edge formed in a step shape on the water access surface side of the large-diameter blade is constituted by a plurality of water access surfaces in the circumferential direction. 3. The method of claim 1 or 2,
Drainage pump, characterized in that the water penetration surface of the large-diameter blade and the upper edge part water penetration surface or the outer edge part water penetration surface are formed as a continuous curved surface with a predetermined curvature. delete

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