JP2013064396A - Drain pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drain pump which satisfies simultaneously improvement of ejection ability and silence upon operation.SOLUTION: A rotation blade 70 used for the drain pump includes: a plurality of plate-like large-diameter blades 60 extended in the 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 the lower edge parts of the large-diameter blades 60; and auxiliary blades 68 disposed between the large-diameter blades adjacent to each other. On the outer circumferences of the large-diameter blades and the auxiliary blades, step parts 72, 74, 82 and 84 which guide water current stirred up by the blades toward the outer side of the blades are disposed. By the step parts, the flowing of the drain water into a space on the back side of the blades can be suppressed and, therefore, vibration and noise can be suppressed even when the ejection ability is improved.

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.

  2. Description of the Related Art Conventionally, an air conditioner of a type embedded in a ceiling in 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.

  An example of the drainage pump used in the air conditioner is shown in FIG. In FIG. 17, (a) is a front view showing a part of the drainage pump, (b) is a plan view of an example of a rotary blade used in the drainage pump shown in (a), and (c) is (b). It is a front view of the rotary blade shown (refer to patent documents 1).

  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 the draining disc 14 prevents the drain water ejected from the through hole 36 of the cover 32 from scattering to the motor 10 side.

  The lower end edge of the large-diameter blade 60 is formed in a tapered shape, and the lower end edge is connected by a disk-shaped annular member 62 having an opening 63. Auxiliary blades 68 (four in the illustrated example) are provided between the adjacent large-diameter blades 60, 60, and the pump head can be secured by the auxiliary blades 68 and the large-diameter blades 60. The outer edge portions of the large-diameter blade 60 and the 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. Bubbles generated from the drain water by the rotation of the large-diameter blade 60 pass over the ring-shaped wall member 64 and smoothly flow to the discharge port 46, so that the collision of the bubbles with the bottom surface 35 of the cover 32 is alleviated and noise is reduced. To do. In addition, 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 ring-shaped wall member 64 and gradually diffuses due to the buffering of the ring-shaped wall member 64. Noise caused by water is also reduced.

  The lower end portion of the ring-shaped wall member 64 is annularly connected to an annular member 62 that connects the lower end edge portions of the large-diameter blade 60 and the auxiliary blade 68. The annular member 62 divides the level of the drain water rising from the suction port 42 substantially vertically, reducing the amount of water in contact with the large-diameter blade 60 and reducing the amount of bubbles generated. The lower end edges of the large-diameter blade 60 and the auxiliary blade 68 are formed in a shape inclined toward the small-diameter blade 54, and the annular member 62 is also formed in a dish shape in accordance with this inclination.

  The operation of the drainage pump 1 is set to stop the drainage from the surface of the evaporator, which is a heat exchanger, after the main switch of the air conditioner is turned off and to complete the drainage. Yes. When the drain pump 1 stops, the drain water in the rising drain pipe that leads to the outside of the indoor unit flows in the reverse direction through the discharge port 46 to return to the drain pump 1, and the drain in the drain pump 1 that has returned from the drain pipe Water flows into the drain pan and is stored.

JP 2006-29214 A

  In the conventional drainage pump described above, the ring-shaped wall member 64 is provided around the outer periphery of the blade to prevent the drain water from returning from the drainage pipe and to reduce the noise of the drainage pump. The member 64 acts like a wall with respect to the water swept out by the blades, causing the drainage performance (discharge capacity) to deteriorate. In order to avoid a decrease in the discharge capacity, it is conceivable to reduce the height of the ring-shaped wall member 64, but in this case, water easily enters the space between the blades on the rear side in the rotation direction, and noise and vibration of the drainage pump. There is a problem that becomes high.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a drainage pump that achieves both improved discharge capacity and quietness during operation.

  In order to solve the above problems, a drainage pump according to the present invention includes a motor, a rotary blade connected to the output shaft of the motor, a suction port at a lower end, and a discharge port at a side. A housing that rotatably accommodates the rotating blades, the rotating blades being connected to an output shaft of the motor, a plurality of plate-shaped large-diameter blades extending radially from the shaft portion, A drainage pump having a plurality of plate-like small-diameter blades connected to the lower edge of the large-diameter blade, wherein the water flow swirled by the large-diameter blade is applied to the edge of the large-diameter blade outside the large-diameter blade. It is characterized by the provision of a guide unit that guides the user toward the direction.

In this drainage pump, the guide portion provided at the edge of the large-diameter blade may be, for example, an upper edge of the large-diameter blade and an outer edge of the large-diameter blade, or an upper edge of the large-diameter blade. It can be set as the step part provided in either the outer edge part.
Moreover, the small diameter blade | wing can also be provided with the guide part which guides the water flow which a small diameter blade | wing stirs toward the outward of a small diameter blade | wing. This guide part can also be comprised by the step part provided in the outer edge part of the small diameter blade | wing.

According to the drainage pump of the present invention, the water swirled by the large-diameter blade is guided outward by the guide portion provided at the edge of the large-diameter blade, so that it is difficult to flow into the space downstream of the large-diameter blade. The vibration and noise caused by the gas-liquid interface contacting the large-diameter blade can be reduced. Therefore, even if the height of the ring-shaped wall member is lowered, vibration and noise can be suppressed, so that improvement in discharge capacity and quietness during operation can be achieved at the same time.
Moreover, when providing a guide part in a small diameter blade | wing, the quietness at the time of starting improves especially.

It is a figure which shows 1st Example of the rotary blade used for the drainage pump by this invention, Comprising: (a) is a perspective view, (b) is a partially expanded plan view, (c) is a front view. It is a figure which shows 2nd Example of the rotary blade used for the drainage pump by this invention, Comprising: (a) is a perspective view, (b) is a partially expanded plan view, (c) is a front view. It is a figure which shows 3rd Example of the rotary blade used for the drainage pump by this invention, Comprising: (a) is a perspective view, (b) is a partially expanded plan view, (c) is a front view. It is a figure which shows the comparative example for demonstrating the effect of the rotary blade used for the drainage pump by this invention, Comprising: (a) is a perspective view, (b) is a partially expanded plan view, (c) is a front view. is there. It is a figure which shows the modification of the rotary blade | wing of FIG. 1, Comprising: (a) is a partially expanded plan view, (b) is a partially expanded front view. It is a figure which shows the modification of the rotary blade | wing of FIG. 1, Comprising: (a) is a top view, (b) is a front view. It is a figure which shows the modification of the rotary blade | wing of FIG. 1, Comprising: (a) is a top view, (b) is a front view. It is a figure which shows the modification of the rotary blade | wing of FIG. 1, Comprising: (a) is a top view, (b) is a front view. It is a figure which shows 4th Example of the rotary blade used for the drainage pump by this invention, Comprising: (a) is a top view, (b) is a front view, (c) is a bottom view. It is explanatory drawing of the rotary blade shown in FIG. 9, Comprising: (a) is a top view, (b) is a front view, (c) is DD sectional drawing of (b). (A) is AA sectional drawing of Fig.10 (a), (b) is BB sectional drawing, (c) is CC sectional drawing. It is the perspective view which notched a part of rotary blade of 4th Example. The 5th Example of the rotary blade used for the drainage pump by this invention is shown, (a) is a top view, (b) is a front view, (c) is DD sectional drawing of (b). It is sectional drawing of the rotary blade | wing shown in FIG. 13, Comprising: (a) is AA sectional drawing of Fig.13 (a), (b) is BB sectional drawing, (c) is CC sectional drawing. . It is the perspective view which notched a part of 5th Example. It is a graph which shows the effect of the present invention. It is a figure which shows an example of the conventional drainage pump.

  Hereinafter, embodiments of a drainage pump according to the present invention will be described with reference to the accompanying drawings. 1 to 3 show an embodiment of the present invention. Prior to the description of the present embodiment, an example of a rotary blade that does not have the structure of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part which is common in the conventional rotary blade shown in FIG. Step portions are not provided at the edges of the large-diameter blade 60 and the auxiliary blade 68 of the rotary blade 100. Moreover, the ring-shaped wall member which connects the outer peripheral part of the large diameter blade | wing 60 is not provided, but the cyclic | annular flat surface which faced the direction substantially parallel to the axial direction of the axial part 52 at the outer peripheral part of the annular member 62 instead. 164 is formed. With such a structure, the discharge capacity can be improved, but the drain water flow F4 that goes around the outside of the large-diameter blade 60 and the auxiliary blade 68 easily flows into the space behind the rotation direction. As a result, a gas-liquid boundary surface S is formed above the large-diameter blade 60 and the auxiliary blade 68, and this gas-liquid boundary surface S is in contact with the large-diameter blade 60 and the auxiliary blade 68, thereby generating vibration and noise. Observed.

(First embodiment)
1A and 1B are diagrams showing an example of a rotary blade used in a drainage pump according to the present invention. FIG. 1A is a perspective view showing the entire rotary blade, and FIG. 1B is an enlarged view of a part of the rotary blade shown in FIG. (C) is a front view of the rotary blade shown in (a). In description of the Example of this invention, about the structure which is common in the conventional rotary blade shown in FIG. 17, and the rotary blade of the comparative example shown in FIG. 4, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted again. The large diameter blades and auxiliary blades of the rotary blade 70 of this embodiment are denoted by reference numerals 60A and 68A.

  The rotary blade 70 of the drainage pump shown in FIG. 1 is provided with a step 72 at the upper edge 71 and a step 82 at the outer edge 81 of the edge of the large-diameter blade 60A. In this example, not only the large-diameter blade 60A but also the auxiliary blade 68A is provided with a step 74 at the upper edge 73 and a step 84 at the outer edge 83. The step portions 72 and 74 are formed over the entire length of the upper end edge portions 71 and 73 of the blades 60A and 68A. The stepped portions 72 and 74 have an effect of repelling the drain water upward and guiding it upward and outward. The step portions 82 and 84 are formed over the entire length of the outer end edge portions 81 and 83 of the blades 60A and 68A. The step portions 82 and 84 have an effect of guiding the drain water to the outside in the radial direction of the rotary blade 70, as indicated by reference numeral F1. As a result of the synergistic action of the stepped portions 72, 74, 82 and 84, the position of the gas-liquid boundary surface of the drain water bulges outward from the conventional S in a dome shape and becomes a position indicated by S ', as shown in FIG. Since it is only about the outer end of the blade, vibration and noise can be reduced.

  Also, the outermost periphery of the annular member 62 is not provided with the cylindrical wall member 64 that connects the outer peripheral ends of the large-diameter blade 60 and the auxiliary blade 68 as provided in the conventional example shown in FIG. An annular flat surface 164 facing in a direction substantially parallel to the axial direction of 52 is formed. With such a structure, the discharge capacity can be improved. However, as in the example shown in FIG. 4, the drain water easily flows into the space between the blades at the rear in the rotation direction, so that noise and vibration increase. To do. In the present embodiment, as described above, the drain water is guided outward by the step portions 72, 74, 82, and 84 of the blades 60A, 68A. Vibration can be suppressed. Further, by providing the annular flat surface 164, the drain water flow f (see FIG. 5) rising along the bottom surface of the annular member 62 flows across the outer edge portions of the large-diameter blade 60A and the auxiliary blade 68A. There is an effect that the generation of bubbles is suppressed without interfering with F1.

(Second embodiment)
FIG. 2 is a view showing another example of the rotary blade used in the drainage pump according to the present invention, wherein (a) is a perspective view showing the entire rotary blade, and (b) is a part of the rotary blade shown in (a). The top view which expands and shows (c) is a front view of the rotary blade | wing shown to (a). In addition, the large-diameter blade | wing and auxiliary blade | wing of the rotary blade 80 of this Example are attached | subjected the code | symbol 60B, 68B.

  In the rotary blade 80 of the drainage pump shown in FIG. 2, a stepped portion 82 is provided only at the outer end edge portion 81 of the edge portion of the large-diameter blade 60B. A step 84 is also provided on the outer edge 83 of the auxiliary blade 68B. The step portions 82 and 84 are formed over the entire length of the outer end edge portions 81 and 83 of the blades 60B and 68B. The step portions 82 and 84 have an effect of guiding drain water to the radially outer side of the rotary blade 80 as indicated by F2. Thereby, the operation | movement from which a drain water wraps around in the space between the large diameter blade | wing 60 and the auxiliary blade | wing 68 of the rotation direction back is suppressed, and a noise and a vibration can be reduced.

(Third embodiment)
FIG. 3 is a view showing a third embodiment of the rotary blade used in the drainage pump according to the present invention, (a) is a perspective view showing the entire rotary blade, and (b) is a view of the rotary blade shown in (a). The top view which expands and shows a part, (c) is a front view of the rotary blade | wing shown to (a). In addition, the large diameter blade | wing and auxiliary blade | wing of the rotary blade 90 in this Example are attached | subjected the code | symbol 60C, 68C.

  In the rotary vane 90 of the drainage pump shown in FIG. 3, a stepped portion 72 is provided at the upper edge 71 of the edge of the large-diameter blade 60C. A stepped portion 74 is also provided at the upper edge 73 of the auxiliary blade 68C. The step portions 72 and 74 are formed over the entire length of the upper edge portions 71 and 73 of the blades 60C and 68C. The stepped portions 72 and 74 have an effect of repelling the drain water upward and guiding it upward and outward. Therefore, compared with the case where the stepped portions 72 and 74 are not provided, the operation of drain water flowing into the space between the large-diameter blade 60C and the auxiliary blade 68C at the rear in the rotation direction is suppressed, and noise and water scraping sound are generated. Can be reduced. Note that the gas-liquid boundary line moves from the conventional S position to the radially outer position S ″. The flow of drain water that circulates outside the blades 60C and 68C is indicated by F3.

  FIG. 5 is an enlarged view showing a modification of the rotary blade used in the drainage pump according to the present invention. In the rotary blade 100, the stepped portion 82 of the large-diameter blade 60A is formed in a curved surface having an arcuate cross section along the direction of guiding water. Other structures are the same as those of the first embodiment. In the case of forming in this way, separation can be reduced when water gets over the step portion 82, so that vibration and noise can be further reduced, and resistance is also reduced, so that power consumption is also reduced. . In addition, the same effect can be acquired also about the step part 72 by forming in the curved surface of the longitudinal cross-section circular arc shape along the direction which guides water.

  FIGS. 6-8 has shown the modification of the rotary blade of 1st Example. FIG. 6 shows an example in which a ring-shaped wall member 64 is provided in place of the annular flat surface 164, where (a) shows a plan view and (b) shows a front view. In this rotary blade 110, the height of the ring-shaped wall member 64 is made lower than the height of the large-diameter blade 60A to reduce the noise caused by the return water, and the steps 72, 74, 82 and 84 reduce the noise. The vibration is reduced.

  In the example shown in FIG. 7, the outer peripheral portion 62a of the annular member 62 that connects the lower edge of the large-diameter blade 60A is projected to a position facing the outer edge surface of the large-diameter blade 60A. The rotating blade 120 has an advantage that the discharge capacity can be improved as compared with the case where the ring-shaped wall member 64 is provided, and an effect close to that of the ring-shaped wall member 64 can be achieved.

  In the example shown in FIG. 8, the outer peripheral surface 62b of the annular member 62 is formed to be flush with the outer edge surface of the large-diameter blade 60A. The rotary blade 130 has an advantage that the diameter can be reduced.

  The discharge capacity improves as the ring-shaped wall member 64 is lowered or the diameter of the outer peripheral portion 62a of the annular member 62 (the protruding amount from the large-diameter blade) is reduced, but the return of drain water from the drain pipe is suppressed. Since the effect is reduced, the height of the ring-shaped wall member and the diameter of the annular member are selected in consideration of the balance between the effect and the discharge capacity.

(Fourth embodiment)
9 to 12 show a rotary vane of a drainage pump according to a fourth embodiment of the present invention.
The rotary blade 200 includes a shaft portion 210 having a hole 212 as in the previous embodiment.

  The large-diameter blade 230 provided in the cylindrical wall member 220 has a step 232, and the auxiliary blade 240 also has a step 242. In the rotary vane 200 of the present embodiment, the height position of the upper end edge of the cylindrical wall member 220 coincides with the height position of the upper end edge of the large-diameter vane 230 and the auxiliary vane 240, and is cylindrical. A step portion 222 of a cylindrical wall member is formed on the inner wall surface of the wall member 220.

The effect of the step portion 222 of the cylindrical wall member 220 is that the drainage water flows smoothly upward and outward to reduce noise, so that the step portion 232 of the large-diameter blade 230 and the step portion 242 of the auxiliary blade 240 It is the same.
Further, the small-diameter blade 250 of the rotary blade 200 of the present embodiment has a step portion 252.

FIG. 10 is an explanatory diagram of the rotary blade 200, and (c) shows a DD cross section of (b). In the (c) of FIG. 10, small-diameter blade 250 is rotated in the direction of arrow _{R 1.} When the small-diameter blades 250 in the suction port of the pump body pump water by rotation, the water flow flows as shown by an arrow F6, and the effect of reducing noise is produced.

(5th Example)
FIGS. 13-15 shows the rotary blade of the drainage pump based on 5th Example of this invention.
The rotary blade 300 includes a shaft portion 310 having a hole 312.
The cylindrical wall member 320 is formed so that the height positions of the upper edge portions of the large-diameter blade 330 and the auxiliary blade 340 are higher than the height position of the upper edge portion of the cylindrical wall member 320. In the present embodiment, none of the cylindrical wall member 320, the large-diameter blade 330, and the auxiliary blade 340 has a stepped portion.

  Similar to the small-diameter blade 250 described in the fourth embodiment, the small-diameter blade 350 includes a step portion 352. As shown in FIG. 13C, the small-diameter blades 350 rotate in the direction of the arrow R1, and when the small-diameter blades 350 are pumped by rotation, the water flows as shown by the arrow F6 and reduces noise.

FIG. 16 is a graph comparing noise of the drainage pump of the present invention in which a step portion is provided on a small-diameter blade and a conventional drainage pump.
In the graph, the horizontal axis represents the number of revolutions and the vertical axis represents the noise level. The broken line represents the conventional one, and the solid line represents the present invention.
FIG. 16A shows a state at the beginning of suction, FIG. 16B shows a state in which the ink is discharged at a predetermined head, and FIG. 16C shows a state in which it is balanced at a predetermined head.
Although (a), (b), and (c) all show that the noise of the drainage pump of the present invention is reduced, it is an experiment that the noise reduction effect of the drainage pump of the present invention is particularly large in the state of starting suction. Confirmed by

The present invention is not limited to the above embodiments, and various modifications can be made.
For example, in the first to third embodiments, the guide portion is provided for both the large-diameter blade and the auxiliary blade, but the guide portion may be provided only for the large-diameter blade.
In addition, various modifications can be made to the above-described embodiments without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Motor 12 Drive shaft 40 Housing 42 Suction port 46 Discharge port 52 Shaft part 54 Small diameter blades 60A, 60B, 60C Large diameter blade 62 Annular member 68A, 68B, 68C Auxiliary blades 70, 80, 90, 100, 110, 120, 130 Rotating blade 72, 74, 82, 84 Step part (guide part)
164 annular flat surface 200,300 rotary blade 210,310 shaft portion 212,312 hole 220,320 cylindrical wall member 222,322 step portion of cylindrical wall member 230,330 large diameter blade 232,332 step portion of large diameter blade 240,340 Auxiliary blades 242,342 Steps of auxiliary blades 250,350 Small-diameter blades 252,352 Steps of small-diameter blades

Claims (14)

  A motor, a rotating blade connected to the output shaft of the motor, a housing having a suction port at a lower end portion and a discharge port at a side portion and rotatably housing the rotating blade, The blade includes a shaft portion coupled to the output shaft of the motor, a plurality of plate-shaped large-diameter blades extending in a radial direction from the shaft portion, and a plurality of plate-shaped members coupled to a lower edge of the large-diameter blade. A drainage pump having a small-diameter blade, wherein a guide portion is provided at an edge portion of the large-diameter blade to guide the water flow swirled by the large-diameter blade outward.   The drainage pump according to claim 1, wherein the guide part is a step part provided at an upper end edge part and an outer end edge part of the large-diameter blade.   The drainage pump according to claim 1, wherein the guide portion is a step portion provided at an upper end edge portion of the large-diameter blade.   The drainage pump according to claim 1, wherein the guide portion is a step portion provided at an outer edge of the large-diameter blade.   The auxiliary blade is provided between the adjacent large-diameter blades, and the auxiliary blade is provided with a guide portion having the same mode as the guide portion provided in the large-diameter blade. A drainage pump according to claim 1.   An annular member that connects lower end edges of the plurality of large-diameter blades, and an outer peripheral portion of the annular member projects outward from an outer edge of the large-diameter blade, and an upper surface of the annular member The drainage pump according to any one of claims 1 to 5, wherein the drainage pump is an annular flat surface substantially orthogonal to the axial direction.   The drainage pump according to any one of claims 1 to 5, further comprising a ring-shaped wall member that connects outer peripheral portions of the plurality of large-diameter blades.   The height of the said ring-shaped wall member is set lower than the height of the said large diameter blade | wing, The drainage pump of Claim 7 characterized by the above-mentioned.   6. An annular member that connects lower edge portions of the plurality of large-diameter blades is provided, and an outer peripheral portion of the annular member protrudes to a position facing an outer end surface of the large-diameter blade. A drainage pump according to any one of the above.   The drainage pump according to any one of claims 1 to 9, wherein the guide part is formed in a curved surface having an arcuate cross section along a direction in which drain water is guided.   The drainage pump according to any one of claims 1 to 10, wherein the small-diameter blade is provided with a guide portion that guides the water flow swirled by the small-diameter blade outward.   The drainage pump according to claim 11, wherein the guide portion is a step portion provided at an outer edge portion of the small-diameter blade.   A motor, a rotating blade connected to the output shaft of the motor, a housing having a suction port at a lower end portion and a discharge port at a side portion and rotatably housing the rotating blade, The blade includes a shaft portion coupled to the output shaft of the motor, a plurality of plate-shaped large-diameter blades extending in a radial direction from the shaft portion, and a plurality of plate-shaped members coupled to a lower edge of the large-diameter blade. A drainage pump having a small-diameter blade, wherein the small-diameter blade is provided with a guide portion that guides the water flow swirled by the small-diameter blade outward.   The drainage pump according to claim 13, wherein the guide portion is a step portion provided at an outer edge of the small-diameter blade.

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