JP2016070264A - Drainage pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drainage pump in which quietness at the time of its operation is further improved.SOLUTION: A rotary blade 50 used in a drainage pump 1 comprises large-diameter blades 60 having a plurality of water scraping surfaces 110 formed into plates extending in a radial direction from a shaft part 52 connected to an output shaft of a motor; a plurality of plate-like small-diameter blades 54 connected to lower end edges of the large-diameter blades 60; and auxiliary blades 68 provided with water scraping surfaces 111 and arranged between the adjoining large-diameter blades 60. Upper end edge parts and outer end edge parts of the large-diameter blades 60 and the auxiliary blades 68 are provided with steps 72, 74 and 82, 84 for guiding water flow agitated by the blades toward the upper side and outer side of the blades. Upper end edge water scraping surfaces 75 and 76 are formed to be inclined by a prescribed angle with respect to the water scraping surfaces 110, 111, thereby an incident angle of flowing water with respect to the water scraping surfaces 110, 111 and an incident angle of flowing water with respect to the upper end edge water scraping surfaces 75 and 76 and outer end edge water scraping surfaces 85, 86 are set to be substantially same to each other.SELECTED DRAWING: Figure 1

Description

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

  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, the present invention will be described in relation to a drainage pump (Patent Document 2) used in an air conditioner already filed and published by the applicant of the present application. FIG. 11 is a front view showing a part of the drainage pump described as the prior art in Patent Document 2, and FIG. 12A is an example of a rotary blade used in the drainage pump shown in FIG. FIG. 12B is a plan view of the rotary blade shown in FIG.

  In the following description, in principle, parts common to the present invention will be described using the same reference numerals as those used in Patent Document 2. In addition, the terms “upper side”, “lower side”, “inner side”, “outer side” and the like in the present specification are relative to each other based on the positional relationship shown in the drawings for easy understanding of the description. It is defined and does not have an implication as an absolute direction.

  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 62 having an opening 63 at the center. . Further, between the adjacent large-diameter blades 60, 60, auxiliary blades 68 (FIG. 12A, four in the illustrated example) are provided upright from the annular member 62, and the auxiliary blades 68 are provided. 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 68 are connected by a ring-shaped wall member 64. The position of the upper edge of the ring-shaped wall member 64 is set lower than the positions of the upper edges of the large-diameter blade 60 and the auxiliary blade 68.

  According to the rotary blade 50 configured as described above, the water flow including bubbles generated from the drain water disturbed by the rotation of the large-diameter blade 60 passes over the ring-shaped wall member 64 and smoothly flows to the discharge port 46. Therefore, the impact of bubbles on the bottom surface 35 of the cover 32 was alleviated, and the effect of reducing noise was expected. 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 strikes the ring-shaped wall member 64 and is gradually buffered by the ring-shaped wall member 64. Therefore, the reduction of noise caused by the return water was also expected.

As described above, the applicant of the present application has already applied for and disclosed a patent relating to a configuration that enables reduction of noise from the drainage pump.
In patent document 1, it makes it the subject to aim at reduction of the watering noise of the drainage pump with which an air conditioner is equipped. The rotary blade has a shaft portion, and the output shaft of the electric motor is inserted into the bottomed hole of the shaft portion. The plate-shaped large-diameter blade extending in the radial direction from the shaft portion has an outer peripheral side connected to a cylindrical ring member. In the rotary blade of the embodiment, the upper end portion of the ring member is formed in a thin portion and is connected to the dish-like member via the connecting portion.

  Patent Document 2 is a further improvement of the rotary blade shown in Patent Document 1. In Patent Document 2, a rotary blade used in a drainage pump is connected to a plurality of plate-shaped large-diameter blades extending in a radial direction from a shaft portion connected to an output shaft of a motor and a lower edge of the large-diameter blade. It has a plurality of plate-shaped small-diameter blades and auxiliary blades provided between adjacent large-diameter blades. On the outer periphery of the large-diameter blade and the auxiliary blade, a step portion for guiding the water flow swirled by the blade toward the outside of the blade is provided. Since these step portions can suppress the drain water from flowing into the space behind the blades, vibration and noise can be suppressed even when the discharge capacity is improved.

JP 2006-29214 A JP2013-64396A

  In the drainage pumps of the above patent documents, a certain effect on the silence of the drainage pump has been confirmed. In particular, when the invention described in Patent Document 2 is re-verified, the effect of providing a step portion as a guide portion is sufficiently exhibited. And this invention pursues the further improvement technique on the premise of providing the step part as a guide part.

  As described in Patent Document 2, when the invention in which the stepped portion is formed on the upper end edge and the outer end edge of the rotary blade 50 is re-verified, as shown in FIGS. 6 and 7, the large-diameter blade 60 and In this configuration, stepped 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 auxiliary blades 68, respectively. At this time, the large-diameter blade 60 and the auxiliary blade 68 stir the drain water to generate a water flow. The surface that scrapes the drain water by the rotation of the large-diameter blade 60 and the auxiliary blade 68 at that time is referred to as a “water scraping surface”. To do. In other words, the large-diameter blade 60 forms the water scraping surface 110, the upper edge edge water scraping surface 75, and the outer edge edge water scraping surface 85, and the auxiliary blade 68 is the water scraping surface 111, the upper edge edge water scraping surface 76, and the outer surface. An edge watering surface 86 is formed.

  By rotating the rotary blade 50, the drain water is pumped up by the small-diameter blade 54, further centrifugal force is given by the large-diameter blade 60 and the auxiliary blade 68, and is discharged from the discharge port 46 beyond the annular flat surface 164. At that time, relative running water Fa1 is generated by the water scraping surface 110 of the large-diameter blade 60 and the water scraping surface 111 of the auxiliary blade 68 scuffing water (FIG. 7). In FIG. 7, flowing water Fa1 and Fa2 represented by arrows indicate relative water inflow directions (incident angles) and flow velocities that are scratched by the rotation with respect to the respective scraping surfaces of the rotary blades 50. And the step parts 72 and 74 of the large diameter blade | wing 60 and the auxiliary blade | wing 68 play the effect | action which repels drain water upwards and guides it upwards and outwards. That is, the stepped portions 72 and 74 of the large-diameter blade 60 and the auxiliary blade 68 have an effect of guiding the drain water upward as indicated by the flowing water F (the dashed line in FIG. 7A). The step portions 82 and 84 are formed on the outer edge portions 81 and 83 of the large-diameter blade 60 and the auxiliary blade 68. Accordingly, the step portions 82 and 84 have an effect of guiding the drain water outward in the radial direction of the rotary blade 50.

  Thus, the synergistic action of the step portions 72, 74, 82, and 84 of the large-diameter blade 60 and the auxiliary blade 68 causes the water flow to swell upward and flow, so that the state of the gas-liquid boundary surface of the drain water is conventional. Since it is in a state of bulging outward from the state and hangs on the outer edge of the large-diameter blade, it is difficult for the water flow to flow into the space upstream of the next large-diameter blade or auxiliary blade, and bubbles are mixed The vibration and noise generated in the can be reduced.

  With the above configuration, a considerable effect is achieved in the noise reduction effect. However, in the invention of Patent Document 2, the scraping surface (the scraping surface of the large diameter blade 60) of the rotary blade (the large diameter blade 60 and the auxiliary blade 68). 110 and the drainage surface 111 of the auxiliary blade 68) and the incident surface of the stepped portions (72, 82 and 74, 84) as guide portions (75, 85 and 76, 86 to be described later) are incident angles of relative flowing water. Therefore, the water flow is disturbed, the surrounding air becomes bubbles and mixed, and when this bursts, slight vibration and noise may occur.

  The present invention has been made in view of the above-mentioned problems, and its object is to make the incident angles of the relative flowing water equal to the watering surface of the rotary blade and the watering surface of the stepped portion (guide portion). Accordingly, it is an object of the present invention to provide a drainage pump that suppresses the disturbance 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-mentioned problems, the drainage pump according to the present invention is a drainage pump that houses a rotary blade that is rotatably supported in a housing having a suction port at a lower end and a discharge port at a side. The rotary vane includes a plurality of radial small-diameter vanes and a plurality of large-diameter vanes formed continuously above the small-diameter vanes, and a stepped shape is formed on the scuff surface side of the large-diameter vanes. Forming an upper edge scuffing surface or an outer edge scuffing surface, an incident angle of flowing water hitting the scuffing surface of the large-diameter blade, and a flowing water hitting the upper edge scuffing surface or the outer edge scuffing surface. It is characterized in that the incident angle is made equal.

  Further, the drainage pump according to the present invention is characterized in that an upper end edge watering surface and an outer end edge watering surface are formed stepwise on the watering surface side of the large-diameter blade.

  Further, the drainage pump according to the present invention is configured such that the incident angle of the flowing water hitting the upper edge watering surface or the outer edge watering surface becomes the same as the incident angle of the flowing water hitting the watering surface of the large-diameter blade. It is characterized by that.

  Further, the drainage pump according to the present invention is characterized in that the upper edge edge water scraping surface formed stepwise on the water scraping surface side of the large-diameter blade is constituted by a plurality of water scraping surfaces in the circumferential direction.

  Furthermore, the drainage pump according to the present invention is characterized in that the scooping surface of the large-diameter blade and the upper end edge scooping surface or the outer end scuffing surface are formed by a continuous curved surface with a predetermined curvature.

  According to the drainage pump of the present invention, the water swirled by the large-diameter blades collides with the scraping surface of the rotating blades, and then becomes a water flow relative to the rotating blades to become the upper edge edge scraping surface and the outer edge portion. Although guided by the scooping surface, the incident direction of the flowing water to the upper edge watering surface and the outer edge watering surface can be set to be substantially the same as the incident angle of the flowing water to the watering 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. In addition, at that time, the corners of the blades are rounded by forming the scraping surface of the large-diameter blade and the upper edge edge scraping surface or the outer edge edge scraping surface with a continuous curved surface with a predetermined curvature, By suppressing flow separation, it is possible to suppress the generation of bubbles and further reduce the generation of noise, thereby achieving a more uniform relative water flow.

It is a perspective view which shows the structure of the rotary blade used for the drainage pump in 1st Example of this invention. It is a top view of the rotary blade shown in FIG. It is a front view of the rotary blade shown in FIG. It is a bottom view of the rotary blade shown in FIG. It is an enlarged plan view of only one large-diameter blade in order to explain the detailed structure of the large-diameter blade of the rotary blade used in the drainage pump in the first embodiment of the present invention. It is a perspective view for comparing and explaining the drainage pump provided with the rotary blade which formed the guide part used as the premise of the present invention with this invention. It is an enlarged view of only one large-diameter blade in order to explain the detailed structure of the large-diameter blade of the rotary blade used in the drainage pump provided with the rotary blade formed with the guide portion as a premise of the present invention. It is explanatory drawing which compares the water flow of the rotary blade which formed the guide part used as the premise of this invention, and the rotary blade used for the drainage pump in 1st Example of this invention. It is an enlarged plan view of only one large diameter blade in order to explain the detailed structure of the large diameter blade of the rotary blade used in the drainage pump in the second embodiment of the present invention. It is the graph which compared the magnitude | size of the noise (sound pressure level) for every frequency band with the rotary blade used for the drainage pump in a prior art example and 1st Example. It is a schematic block diagram 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 top view which shows the structure of the rotary blade used for the drainage pump in 3rd Example of this invention. It is a perspective view which shows the structure of the rotary blade used for the drainage pump in 3rd Example of this invention. It is principal part sectional drawing which shows the structure of the rotary blade used for the drainage pump in 3rd Example of this invention, (a) Sectional drawing in the AA surface of FIG. 13, (b) BB surface of FIG. FIG.

  Hereinafter, embodiments of a drainage pump according to the present invention will be described with reference to the accompanying drawings. 1 to 5 and FIG. 8B, FIG. 9, and FIG. 13 to FIG. 15 show an embodiment of the present invention. 11 and 12 show the structure of a conventional rotating blade, and FIGS. 6, 7 and 8A show the structure of a rotating blade provided with a guide as a premise of the present invention. . In the following description, the same reference numerals are assigned to parts common to conventional rotary vanes or rotary vanes equipped with guide portions.

(First embodiment)
1 to 5 are views showing a first embodiment of a rotary blade used in a drainage pump according to the present invention, FIG. 1 is a perspective view showing the whole rotary blade, and FIG. 2 is a rotation shown in FIG. FIG. 3 is a front view of the rotating blade shown in FIG. 1, FIG. 4 is a bottom view of the rotating blade shown in FIG. 1, and FIG. 5 is a detailed structure of one large-diameter blade of the rotating blade. FIG. In the description of the embodiments of the present invention, the same reference numerals are given to the structures common to the conventional rotating blades shown in the rotating blades (FIG. 6 and FIG. 7) provided with the guide portion assumed by the present invention, and Detailed description is omitted.

  A rotary blade 50 of the drainage pump 1 shown in FIG. 1 is provided with a large-diameter blade 60 that is continuous with a plurality of small-diameter blades 54 that drains the drain water in the drain pan. Further, a scraping surface 110 for scooping out drain water is formed beyond the annular flat surface 164 of the disc-shaped annular member 62, and a stepped portion 72 is formed on the upper end edge portion 71 of the edge portion of the large-diameter blade 60. The outer end edge 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 part 72 to the upper edge part 71. Further, an outer edge scooping surface 85 is formed as a wall surface rising from the step portion 82 toward the outer edge 81. In the first embodiment, upper edge scooping surfaces 75A and 75B composed of two discontinuous surfaces are formed. The detailed configuration and functions of the upper edge edge scraping surfaces 75A and 75B will be described later.

  Further, in the first embodiment, not only the large-diameter blade 60 but also the auxiliary blade 68 is formed with a scraping surface 111 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.

  In the first embodiment, the step portions 72 and 74 are formed over the entire length of the upper end edge portions 71 and 73 of the large-diameter blades 60 and the auxiliary blades 68. As a result, the stepped portions 72 and 74 have an effect of repelling the drain water flow upward and guiding it upward and outward from each large-diameter blade 60 and each auxiliary blade 68. Further, the step portions 82 and 84 are formed over the entire length of the outer end edge portions 81 and 83 of the large-diameter blades 60 and the auxiliary blades 68. Accordingly, the step portions 82 and 84 have an effect of repelling the flow of drain water outward and guiding it outward of each large-diameter blade 60 and each auxiliary blade 68. Hereinafter, the first embodiment will be described in relation to the large-diameter blade 60, but it goes without saying that the same configuration can be applied as the configuration of the auxiliary blade 68.

  FIG. 5 is an enlarged plan view showing a detailed structure of one large-diameter blade 60 of the rotary blade 50 shown in FIG. 1 of the first embodiment. Conventionally, the rotary blade 50 has a large-diameter blade 60 and an auxiliary blade 68 formed with appropriate thicknesses in view of the manufacturing process and durability, and a central portion of the rotary blade 50 is a central axis that is the center of rotation of the shaft portion 52. It is usual that the center line X1 from O passes through (FIG. 12, FIG. 7 (b) and FIG. 8 (a)). As a result, the upper edge 71 and the step 72 can be formed with substantially equal widths (t1, t2) in the radial direction at the outer edge of the rotary blade 60 (FIGS. 5 and 7). (B)). That is, by setting the relationship “plate thickness t1 of the stepped portion 72” ≈ “plate thickness t2 of the upper end edge portion 71”, the central portion of the large-diameter blade 60 and the auxiliary blade 68 is the center of rotation of the shaft portion 52. In general, the center line X1 from the center axis O passes through.

  When such a rotating blade 50 is rotated to sweep out drain water, it is pumped up by the small-diameter blade 54, and further, centrifugal force is applied to the drain water on the scraping surface 110 of the large-diameter blade 60 to form a water flow. A water flow is pushed out in the radial direction of the rotary blade 50 beyond the annular flat surface 164 of the annular member 62. In the first embodiment, each of the two discontinuous upper edge edge water scraping surfaces 75A and 75B is inclined at a predetermined angle with respect to the water scraping surface 110 of the large-diameter blade 60, thereby The incident angle on the plane of the relative flowing water Fb1 with respect to the water scraping surface 110 and the incident angle on the plane of the relative flowing water Fb2 with respect to the upper edge edge scraping surfaces 75A and 75B are configured to be substantially the same (FIG. 5 and FIG. 8 (b)).

  Here, using FIG. 7 and FIGS. 8A and 8B, the large-diameter blade 60 of the rotary blade 50 provided with the guide portion assumed in the present invention shown in FIG. 6 and the first embodiment of the present invention. The difference in water flow generation between the large-diameter blade 60 and the large-diameter blade 60 is compared and explained. 7 (a) and 7 (b) show the direction of the incident angle of the flowing water of the drain water with respect to the scuffing surface 110 and the upper edge scuffing surface 75 of the large-diameter blade 60 provided with the guide portion assumed in the present invention. This is indicated by Fa1 and Fa2. 8 (a) and 8 (b) show the generation of water flow in the large-diameter blade 60 provided with the guide portion assumed by the present invention and the generation of water flow in the large-diameter blade 60 in the first embodiment of the present invention. It is explanatory drawing for demonstrating the difference of these.

  First, in the relative flowing water F (one-dot chain line) as shown in FIG. 7A, the water scraping surface 110 and the upper edge edge water scraping surface 75 as shown in FIG. 7B are formed in parallel. Consider the case where the diameter blade 60 is used. Here, the entire water flow is displayed as a running water F with a one-dot chain line, the water flow that hits the scraping surface 110 of the large-diameter blade 60 is displayed as the flowing water Fa1, and the water flow that hits the upper edge scuffing surface 75 of the large-diameter blade 60 is displayed as the flowing water Fa2. ing. The incident angle of each flowing water Fa1, Fa2 in this case will be examined in detail.

  Since the large-diameter blade 60 rotates about the center O of the shaft 52, the running water F scraped thereby flows in a circumferential shape indicated by a dotted line in FIG. Then, as shown in FIG. 8A, the flowing water incident angle β of the flowing water Fa <b> 2 with respect to the upper edge edge water scraping surface 75 of the large-diameter blade 60 is such that the upper edge edge water scraping surface 75 is centered on the center O of the shaft 52. The angle is approximately 90 degrees because it is on the plane including the center line X1. However, the flowing water incident angle α of the flowing water Fa1 with respect to the scraping surface 110 of the large-diameter blade 60 is substantially perpendicular to a plane including the center line X3 centering on the center O of the shaft 52. The incident angle of the drain water relative to the water scraping surface 110 is the flowing water incident angle α, which is different from the incident angle β of the flowing water Fa2. Specifically, the flowing water entrance angle α with respect to the scooping surface 110 that protrudes forward relative to the upper edge edge scooping surface 75 on the surface including the center line X1 is the flowing water entrance angle with respect to the upper edge scooping surface 75. The angle is sharper than β. That is, the relationship of “flowing water incident angle α of flowing water Fa1” <“flowing water incident angle β of flowing water Fa2” is satisfied. At this time, when the running water F scraped onto the stepped portion 72 of the large-diameter blade 60 is further scraped upward from the upper end edge portion 71, the incident angle of the running water F on the scraping surface is different. The turbulent flow is generated by changing the vector of the flowing water F, which causes bubbles to mix and contributes to noise.

  Based on such a function and effect of the guide section (step section), the configuration and function of the large-diameter blade 60 in the first embodiment of the present invention will be described with reference to FIG. The large-diameter blade 60 of the first embodiment shown in FIG. 8B is configured such that the center of the plate thickness is on a plane including the center line X1 with the center O of the shaft 52 as the center. The reason is the rotation uniformity of the rotary blade 50. In order to prevent the running water F shown in FIG. 8A from being disturbed, in the first embodiment of the present invention, “flowing water incident angle α of flowing water Fa1” ≈ “flowing water incident angle β of running water Fa2”. In order to achieve the relationship, the angle of the upper edge edge scraping surface 75 (75A, 75B) with respect to the running water F is slightly inclined. In this manner, by forming the upper edge edge scraping surface 75 inclined by a predetermined angle with respect to the water scraping surface 110B, the relative flowing water incident angle Fb2 with respect to the water scraping surface 110 and the relative relative to the upper edge edge scraping surface 75. The flowing water incident angle Fb1 can be made substantially the same incident angle. As a result, the flowing water F drained from the stepped portion 72 to the upper edge portion 71 can be maintained in the direction of the flow without being disturbed, and the generation of the turbulent flow is suppressed and the bubbles are mixed into the water flow. Can be reduced.

  FIG. 10 is a graph comparing noise (sound pressure level) between the drainage pump using the rotary blades in the first embodiment of the present invention and the drainage pump using the conventional rotary blades. In the graph, the horizontal axis represents the number of rotations and the vertical axis represents the noise level. The broken line represents the conventional one, and the solid line represents the present invention. As shown in this graph, it was confirmed that the noise reduction effect appears remarkably in the low frequency noise region and the high frequency noise region.

  In the first embodiment of the present invention, the number of the upper edge edge scraping surfaces 75 formed on the surface including the center line X1 centered on the center O of the shaft 52 (that is, in the first embodiment, Two of 75A and 75B) and the angle at which the upper edge edge scraping surface 75 is inclined must be appropriately changed according to the radial size and thickness of each rotary blade (large-diameter blade 60 and auxiliary blade 68). There is. For example, as shown in the top view of FIG. 2, the upper edge scraping surface 75 of the large-diameter blade 60 in the first embodiment of the present invention has two steps in the circumferential direction in the vicinity of the central portion of the large-diameter blade 60. (75A, 75B), but when the upper edge edge scraping surfaces 75A, 75B are formed on the same plane by the one upper edge edge scraping surface 75, the outer periphery is shifted to the center. This is because, as it goes, a plate thickness that exceeds the water scraping surface 110 of the large-diameter blade 60 shown in FIG. 8B is required, and the large-diameter blade 60 as a whole needs to have a considerable thickness. This is not preferable from the viewpoint of manufacturing cost as the operation of the rotary blade. Therefore, even if the upper edge edge scraping surface 75 is inclined, the entire thickness of the rotary blade 60 can be suppressed by forming the upper edge edge scraping surface 75 by appropriately dividing (75A, 75B). it can.

  In addition, according to the incident angle (flowing water incident angle (alpha)) of the flowing water Fb1 with respect to the scraping surface 110 of the large diameter blade | wing 60 shown in FIG.8 (b), flowing water Fb2 to the upper edge edge scraping surface 75A of FIG. In order to equalize the incident angle (running water incident angle α), the scraping surface 110 of the large-diameter blade 60 protrudes by the plate thickness t1 of the step 75A from the center line X1 centering on the center O of the shaft 52. Since it is placed in the state, it is necessary to place the upper edge edge scraping surface 75A in a state where it protrudes by t1 (the amount of protrusion of the scraping surface 110) from the center line X2 centering on the center O of the shaft 52. There is. By forming the upper edge edge water scraping surface 75 so as to satisfy this relationship, the inclination angle of the upper edge edge water scraping surface 75 (75A, 75B) is determined. In this case, if the upper edge edge scraping surface 75 (75A, 75B) is formed on a plane parallel to the center line X2 centered on the center O of the shaft 52, the upper edge edge scraping surface 75 (75A, 75B). Is arranged at a position parallel to the center line X2 and advanced forward by t1. In the case where the upper edge edge water-cleaning surfaces 75A and 75B are formed in two stages, the same applies to the upper edge edge water-raising surface 75B. Normally, each of the upper edge edge scraping surfaces 75A and 75B is formed as a parallel surface. Further, depending on the diameter of the rotary blade 50, one or a plurality of upper edge edge scraping surfaces are provided. You may form suitably.

  The inclination of the upper edge edge watering surface 75 </ b> A is continuously formed as one inclined surface on the outer edge edge watering surface 85. In addition, inclined surfaces are formed in the same way with respect to the upper edge edge watering surface 76 and the outer edge edge watering surface 86 of the auxiliary blade 68.

(Second embodiment)
FIG. 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 drainage pump 1 of the present invention. In the first embodiment, in order to match the incident angle of the flowing water Fb2 with respect to the upper edge edge scraping surface 75 to the incident angle of the flowing water Fb1 with respect to the scraping surface 110, the upper edge edge scraping surfaces 75A and 75B with respect to the scraping surface 110. Tilt to form. However, in the second embodiment, conversely, in order to match the incident angle of the flowing water Fb2 with respect to the upper edge edge scraping surface 75 and the incident angle of the flowing water Fb1 with respect to the scraping surface 110, the rotation center O of the shaft 52 is set as the center. In the same manner that the upper edge edge water scraping surface 75 is positioned on the surface including the center line X1 including the rotation center axis of the rotary blade 50, the water scraping surface 110 is composed of a plurality of water scraping surfaces 110A and 110B. Each of the water scraping surfaces 110A and 110B is tilted. At that time, each of the scuffing surfaces 110A and 110B is configured to exist on a surface including the center line X4 or X5 with the center O of the shaft 52 as the center. As a result, similar to the first embodiment, the relative angle of the flowing water can be made the same between the water scraping surfaces 110A and 110B and the upper edge edge water scraping surface 75, and the same effect as the first embodiment can be obtained. It becomes possible to play. In the case of the second embodiment, the water scraping surfaces 110A, B and the upper edge edge water scraping surface 75 are on the surface including the center line (X1, X4, X5) centered on the center O of the shaft 52. In any plane, the relative incident angles of the flowing water Fc1 and Fc2 can be configured to be substantially perpendicular.

(Third embodiment)
FIG. 13 is a plan view showing a third embodiment of the rotary blade 50 used in the drainage pump of the present invention. As shown in FIG. 13, a guide portion 82 that is a step portion provided on the outer peripheral side of the large-diameter blade 60, an outer edge end portion 81, and a guide portion 84 that is a step portion provided on the outer peripheral side of the auxiliary blade 68, The outer edge 83 is formed to be rounded with a predetermined curvature. That is, in the rotary blade 50 shown in the third embodiment, the surfaces of the large-diameter blade 60 and the auxiliary blade 68 from the scraping surfaces 110 and 111 through the guide portions 82 and 84 to the outer edge ends 81 and 83 are the same as those in the first embodiment. Compared with Example 2, it is formed so as to be gentle.

  Fig.15 (a) is the large diameter blade | wing 60 shown in FIG. 13, Comprising: It is sectional drawing in an AA surface. Similar to the guide part 82 and the outer edge part 81 described above, the shape from the water scraping surface 110 to the upper edge part 71 via the stepped part 72 is also gently formed with a predetermined curvature R1, R2. Although not specifically illustrated, 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 formed with a curve with a predetermined curvature. However, it is also possible to form a gentle curve with a predetermined curvature R3 in this portion as well.

  With such a configuration, the corners (edges) are rounded, so that it is possible to suppress separation of the water flow generated at the corners. Accordingly, it is possible to suppress the generation of bubbles generated by the separation flow that occurs at the scraping surface, the guide portion, and the outer edge, and to reduce noise.

  Note that the boundary 75C between the upper edge edge scraping surfaces 75A and 75B is formed along the circular opening 63 of the annular member 62 when viewed in plan, as is apparent from FIG. That is, the boundary 75C is formed so as to overlap the circular opening 63 when viewed in plan. Further, the boundary 75C and the upper edge edge scraping surface 75B are formed to have a continuous surface with a predetermined curvature. Thereby, the incident angle of the water flow scraped by the upper edge edge scraping surface 75A in the vicinity of the boundary 75C can be changed gently.

  FIG.15 (b) is sectional drawing of the small diameter blade | wing 54 in the BB surface of the rotary blade 50 shown in FIG. Similarly to the large-diameter blade 60 and the auxiliary blade 68, the small-diameter blade 54 is gently formed with a predetermined curvature, thereby suppressing the generation of bubbles caused by the separation of the water flow and reducing noise.

  In addition, this invention is not limited to said each Example, A various deformation | transformation is possible. For example, in the first, second, and third embodiments, it is assumed that guide portions are provided on both large-diameter blades and auxiliary blades. However, only the large-diameter blades are provided with guide portions that implement the present invention. It may be. In addition, the incident angle of the flowing water with respect to the scraping surface 110 of the large diameter blade 60 and the incident angle of the flowing water with respect to the upper edge edge scraping surface 75 of the large diameter blade 60 are substantially the same incident angle. It goes without saying that various modifications can be made to the above-described embodiments without departing from the gist of the present invention in which one of them is inclined at a desired angle.

DESCRIPTION OF SYMBOLS 10 Motor 12 Drive shaft 40 Housing 42 Suction port 46 Discharge port 52 Shaft part 54 Small diameter blade 60 Large diameter blade 62 Annular member 68 Auxiliary blade 50 Rotary blade 72, 82 Step part (guide part) (large diameter blade)
75, 75A, 75B, 76 Upper edge edge scraping surface 74, 84 Stepped portion (guide portion) (auxiliary blade)
85,86 Outer edge edge scraping surface 110, 110A, 110B water scraping surface (large diameter blade)
111 Watering surface (auxiliary blade)
164 annular flat surface

Claims (5)

A drainage pump containing a rotary vane rotatably supported in a housing having a suction port at a lower end and a discharge port at a side,
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, and the upper end of the large-diameter blade has a stepped upper end. Forming an edge scooping surface or an outer edge scuffing surface, an incident angle of flowing water hitting the scuffing surface of the large-diameter blade, and an incident angle of flowing water hitting the upper edge scuffing surface or the outer edge scuffing surface; A drainage pump characterized by being configured to be equal to each other.   The drainage pump according to claim 1, wherein an upper edge edge scraping surface and an outer edge edge scraping surface are formed stepwise on the scraping surface side of the large-diameter blade.   The incident angle of flowing water hitting the upper edge edge watering surface or the outer edge edge watering surface is configured to be the same as the incident angle of flowing water hitting the watering surface of the large-diameter blades. 2. The drainage pump according to 2.   The drainage pump according to claim 3, wherein the upper edge edge scraping surface formed stepwise on the scraping surface side of the large-diameter blade is constituted by a plurality of scraping surfaces in the circumferential direction.   5. The water scraping surface of the large-diameter blade and the upper edge edge scraping surface or the outer edge scraping surface are formed as a continuous curved surface with a predetermined curvature. 6. Drainage pump.

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