JP2013167234A - Drainage pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drainage pump, in which the number of parts can be reduced, while waterproofness of a motor is secured.SOLUTION: A drainage pump includes a pump body 10 having a suction port 12, a delivery port 16 and a pump chamber 14 communicating with them, a rotary blade 20 arranged in the pump chamber, a motor 100 for rotating the rotary blade, and a motor receiving member 50 fixed to an upper part of the pump body and supporting the motor. The motor is a mold motor. The motor receiving member has a cover part 52 for covering an opening part of the pump body, a motor receiving part 60 integrally molded with the cover part, and a plurality of installation legs 70 integrally molded in the motor receiving part to be installed in an indoor unit.

Description

  The present invention relates to a drainage pump that is installed in an indoor unit of an air conditioner and sucks up drain water generated during operation of the air conditioner and discharges the drain water to the outside.

  For example, an indoor unit of an air conditioner attached to a ceiling of a building stores drain water generated during operation in a drain pan, sucks the water with a drain pump, and discharges the water toward the outside.

  Patent Document 1 below discloses an example of this type of drainage pump. The drainage pump is fixed to a pump body having a suction port, a discharge port and a pump chamber communicating with the suction port, a rotary blade disposed in the pump chamber, a motor for rotating the rotary blade, and an upper portion of the pump body. And a motor receiving member for supporting the motor.

  The motor is covered with a waterproof structure including an upper case and a lower case, and is supported by a motor receiving member via the lower case. The upper case is integrally formed with a mounting leg for fixing to the indoor unit by screwing.

JP 2008-291780 A

  In the drainage pump described above, since a separate waterproof structure containing the motor is attached to the upper part of the cylindrical motor receiving member, the number of parts and assembly man-hours are large, and the manufacturing cost increases. There is a problem.

  The objective of this invention is providing the drainage pump which can reduce a number of parts, ensuring the waterproofness of a motor.

  In order to achieve the above object, a drainage pump according to the present invention is a drainage pump that is provided in an indoor unit of an air conditioner and sucks up drain water generated during operation of the air conditioner and discharges it to the outside. A pump body having a port, a discharge port, and a pump chamber communicating with them, a rotating blade disposed in the pump chamber, a motor for rotating the rotating blade, and a motor fixed to the upper portion of the pump body and supporting the motor The motor is a molded motor, and the motor receiving member is integrally formed with the cover, the motor receiving part integrally formed with the cover, the motor receiving part, And a plurality of mounting legs for mounting on the unit.

  In order to facilitate the assembly of the molded motor to the motor receiving member, it is preferable to include a fixing means for fixing the molded motor to the motor receiving portion by snap-fit coupling.

  In this case, the fixing means includes a first fitting portion integrally formed with the molded motor and a second fitting portion integrally formed with the motor receiving portion and fitted with the first fitting portion. This is preferable because the number of parts does not increase.

  In addition, in order to prevent deformation of the motor receiving portion due to stress when the mounting legs are fixed to the indoor unit and to improve the concentricity between the rotary blades and the pump body, the center of the mounting holes of the plurality of mounting legs is the motor receiving portion. It is preferable that it is located on one circumference concentric with the part and arranged at equiangular intervals around the center point of the motor receiving part.

  The number of mounting legs is three, and the centers of the mounting holes of the other two mounting legs are arranged symmetrically with respect to a straight line passing through the center of the mounting hole of one mounting leg and the center of the motor receiving portion. Even if it makes it like, the same effect can be acquired.

  The drainage pump according to the present invention can reduce the number of parts while ensuring the waterproofness of the motor by integrally forming the mounting leg to the indoor unit in the motor receiving portion as a motor for rotating the rotary blade. it can.

One Example of the drainage pump of this invention is shown, (a) is a front view (b) is a principal part top view. It is sectional drawing of the drainage pump of FIG. It is explanatory drawing of the fixing means of the drainage pump of FIG. It is a principal part enlarged view of FIG. It is a principal part top view which shows the other Example of the drainage pump of this invention.

  As shown in FIGS. 1 and 2, the drainage pump 1 includes a pump body 10 made of a synthetic resin. And a pump chamber 14 communicating with the suction port 12 and the discharge port 16.

  A rotary blade 20 is disposed in the pump chamber 14. The rotary blade 20 includes a plurality of large-diameter blades (not shown) extending in the radial direction from the mounting shaft 21, a plurality of small-diameter blades 22 extending in the axial direction downward from each large-diameter blade, and a plurality of large-diameter blades. The disk 23 which has an opening part in the center while connecting the lower edge part, and the ring 24 which connects the outer peripheral part of a some large diameter blade | wing are provided. An output shaft 110 of the mold motor 100 described later is press-fitted into an attachment hole formed at the center of the attachment shaft 21. When the mold motor 100 is driven, the rotary blade 20 rotates in the pump chamber 14.

  The upper surface of the pump main body 10 is open, and a motor receiving member 50 is attached so as to cover it. The motor receiving member 50 is coupled to the pump body 10 by a pair of hook-shaped attachment portions 80 that are integrally formed with the pump body 10. The motor receiving member 50 has a lid portion 52 that covers the opening of the pump body 10, and an O-ring 40 is disposed between the lid portion 52 and the pump body 10.

  The lid 52 has an opening 54 through which the mounting shaft 21 of the rotary blade 20 passes. When the drainage pump 1 is stopped, the water in the pump chamber 14 is ejected from the opening 54 to the outside. The water drain 30 attached between the shaft 110 prevents the water from scattering to the mold motor 100 side.

  A plurality of support posts 56 are formed inside the motor receiving member 50 to support the lower surface of the molded motor 100. A motor receiving portion 60 having an upper surface opened is formed on the motor receiving member 50. The motor receiving portion 60 has a stepped portion 66 at the lower end portion, and the stepped portion 66 supports the mold motor 100.

  A plurality of mounting legs 70 projecting upward and outward are integrally formed at the upper end of the motor receiving portion 60. The mounting leg 70 has a mounting hole 72 through which a screw for fixing the drainage pump 1 to the indoor unit passes. In the present embodiment, three mounting legs 70 are provided, and the center of the mounting hole 72 of these mounting legs 70 is located on one circumference concentric with the motor receiving portion 60, and Around the center point of the motor receiving part 60, it arrange | positions at equal angle intervals.

  And the attachment hole 90 (2nd fitting part) is formed in the position corresponding to each attachment leg 70 in the upper end part of the motor receiving part 60. As shown in FIG. As shown in FIGS. 3 and 4, in this embodiment, the mounting hole 90 is formed as a square hole. The mounting hole 90 and the convex portion 130 (first fitting portion) of the mold motor 100 constitute fixing means for detachably fixing the mold motor 100 to the motor receiving portion 60 by snap-fit coupling.

  The molded motor 100 includes a motor body 105 having a stator covered with a waterproof resin such as BMC, and an output shaft 110 that is rotatably provided via an upper bearing portion 120 and a lower bearing portion 122. With such a structure, it is not necessary to attach a separate waterproof cover to the motor, so the number of parts is reduced. Along with this, the motor receiving member 50 is provided with mounting legs 70 that are conventionally provided on the waterproof cover.

  The three convex portions 130 are integrally formed on the outer peripheral portion of the upper portion of the mold motor 100. As shown in FIG. 4, the lower surface of the convex portion 130 is an inclined surface 132, and the mold motor 100 is moved to the motor receiving portion by aligning each convex portion 130 of the mold motor 100 with the mounting hole 90 of the motor receiving portion 60. When inserted into the motor 60, the convex portions 130 are fitted into the mounting holes 90 almost simultaneously with the bottom surface of the molded motor 100 coming into contact with the stepped portion 66 of the motor receiving portion 60. Fixed.

  The outer diameter of the protrusion 130 is slightly smaller than the inner diameter of the mounting hole 90. The motor receiver 60 is made of a resin material and elastically deforms in the radial direction. By pushing the mold motor 100 into the motor receiving portion 60, the convex portion 130 is coupled to the mounting hole 90 by so-called snap fit coupling.

  As described above, the center of the mounting hole 72 of the mounting leg 70 of the motor receiving member 50 is located on one circumference that is concentric with the motor receiving portion 60 and is equiangular around the center point of the motor receiving portion 60. Since they are arranged at intervals, when the mounting legs 70 are screwed to the indoor unit, the stress acting on the motor receiving portion 60 via the mounting legs 70 is canceled out. The stress acting on the mold motor 100 becomes substantially uniform. As a result, the concentricity between the rotary blade 20 connected to the mold motor 100 and the pump main body 10 is improved, and the gap formed between the rotary blade 20 and the pump main body 10 becomes almost uniform. Is reduced.

  In the present invention, since the motor that rotates the rotary blade 20 is the molded motor 100, waterproofness can be ensured without a waterproof cover that covers the motor. Further, the mounting leg 70 to the indoor unit is integrally formed with the motor receiving member 50. Therefore, the number of parts is smaller than in the prior art, and the manufacturing cost is reduced.

  FIG. 5 shows another embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the part same as the Example of FIG. 1, and description is abbreviate | omitted. Even in this embodiment, the motor receiving portion 60 includes three mounting legs 70 ′ at the upper end. The centers of the remaining two mounting legs 70 ′ are arranged symmetrically with respect to a straight line L passing through the center of the mounting hole 72 of one mounting leg 70 ′ and the center of the motor receiving portion 60. That is, the angles α and β are equal.

  Also in the present embodiment, when each mounting leg 70 'is screwed to the indoor unit, the stress acting on the motor receiving portion 60 via each mounting leg 70' is canceled out, so that each snap fit coupling portion is used as a mold motor. Since the stress acting on 100 becomes substantially uniform and the concentricity between the rotary blade 20 and the pump body 10 is improved, noise and vibration can be reduced.

DESCRIPTION OF SYMBOLS 1 Drain pump 10 Pump main body 12 Suction port 14 Pump chamber 16 Discharge port 20 Rotary blade 50 Motor receiving member 52 Cover part 60 Motor receiving part 70 Mounting leg 90 Mounting hole (2nd fitting part)
100 Mold motor 130 Convex part (first fitting part)

Claims (5)

A drainage pump that is installed in an indoor unit of an air conditioner and sucks up drain water generated during operation of the air conditioner and discharges it to the outside.
A pump body having a suction port, a discharge port and a pump chamber communicating therewith, a rotating blade disposed in the pump chamber, a motor for rotating the rotating blade, and an upper part of the pump body and being fixed to the top A motor receiving member that supports the motor,
The motor is a molded motor;
The motor receiving member includes a lid portion that covers the opening of the pump body, a motor receiving portion that is integrally formed with the lid portion, and a plurality of attachments that are integrally formed with the motor receiving portion and are attached to the indoor unit. A drainage pump characterized by having a leg.   The drainage pump according to claim 1, further comprising a fixing means for fixing the molded motor to the motor receiving portion by snap-fit coupling.   The fixing means includes a first fitting portion integrally formed with the molded motor, and a second fitting portion integrally formed with the motor receiving portion and fitted with the first fitting portion. The drainage pump according to claim 2, wherein   The centers of the mounting holes of the plurality of mounting legs are located on one circumference concentric with the motor receiving portion, and are arranged at equiangular intervals around the center point of the motor receiving portion. The drainage pump according to claim 2 or 3, characterized by the above. Three mounting legs are provided, and the centers of the mounting holes of the other two mounting legs are arranged symmetrically with respect to a straight line passing through the center of the mounting hole of one mounting leg and the center of the motor receiving portion. The drainage pump according to claim 2 or 3, characterized in that.

Images