Drainage pump

Abstract

To provide a drainage pump that makes backflowing drain water less likely to reach a motor while suppressing enlargement thereof.SOLUTION: A drainage pump comprises: a pump body having therein a suction port sucking drain water, a discharge port discharging drain water, and a pump chamber communicating with the suction port and the discharge port, the pump chamber having a moving vane stored therein; a motor which is provided above the pump body and rotates the moving vane; and a motor receiving member that has a lid part provided between the pump body and the motor, covering an opening of the pump body and having in its center a through-hole through which a rotation shaft passes transmitting rotational force of the motor to the moving vane, and a cylindrical outer wall provided on an upper surface of the lid part to support the motor upward, and that forms therein a space surrounded by the motor, the lid and the outer wall. In the pump body, the discharge port is provided on a side part of the pump chamber, and an upper part of the pump body is open. The outer wall has a first wall part and a second wall part with a longer radial distance from the center of the through-hole compared with the first wall part, and the second wall part is provided on an opposite side to the discharge port across the center.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a drainage pump that sucks up and discharges water. [Background technology]

[0002] For example, an indoor unit of an air conditioner that is attached to the ceiling of a building collects drain water generated during operation in a drain pan, and then sucks up the water using a drainage pump and discharges it outside.

[0003] Patent Document 1 below discloses an example of this type of drainage pump. This drainage pump includes a pump body with an open top and a pump chamber communicating with a suction port, a discharge port, and the pump chamber, a rotor blade disposed in the pump chamber, a motor disposed above the pump chamber for rotating the rotor blade, and a hollow case disposed between the motor and the pump chamber and having a bottom that closes the opening of the pump body. In addition, a through hole is formed in the bottom of the case through which a shaft that connects the motor and the rotor blade passes. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-107893 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-mentioned indoor unit, if a pipe is connected to the discharge pipe and drain water is discharged to the outside through the pipe, when the operation of the drain pump is stopped, the drain water in the pipe may flow back into the drain pump. When drain water flows back into the drain pump in this way, the drain water passes through the pump chamber and is ejected from the through hole in a substantially horizontal direction in the opposite direction to the discharge port, and the drain water ejected from the through hole hits the inner surface of the outer wall of the case and rises along the inner surface, and the rising drain water may hit the underside of the motor. For this reason, it is conceivable to set the height of the outer wall at a height that will not cause the motor to become wet, but this would result in a larger drain pump.

[0006] An object of the present invention is to provide a drainage pump in which backflowing drain water is less likely to hit the motor while suppressing the degree of enlargement. [Means for solving the problem]

[0007] A drainage pump according to a first aspect includes a pump body having an intake port for sucking in drain water, an outlet port for discharging the drain water, and a pump chamber connected to the intake port and the outlet port and housing a rotating blade, the outlet port being provided on a side of the pump chamber and having an open top; a motor provided above the pump body for rotating the rotating blades; a lid provided between the pump body and the motor, covering the opening of the pump body and having a through hole formed in the center through which a rotating shaft passes for transmitting the rotational force of the motor to the rotating blades; and a motor support member provided on the upper surface of the lid and including a cylindrical outer wall for supporting the motor at the top, and forming a space surrounded by the motor, the lid, and the outer wall. The outer wall has a first wall portion and a second wall portion that is longer in radial distance from the center of the through hole than the first wall portion, and the second wall portion is provided on the opposite side of the center from the discharge port.

[0008] In the drainage pump according to the first aspect, the rotary vanes arranged in the pump chamber are rotated by the motor, so that drain water sucked in from the suction port is discharged from the discharge port.

[0009] When the motor stops rotating, the drain water downstream of the discharge port may flow back into the pump chamber and gush out into the space in the motor support member through the through hole. In this case, the direction of the drainage water spraying out from the through hole into the space is opposite to the discharge port side, but since the second wall portion of the outer wall is far from the center of the through hole, the momentum of the drain water hitting the second wall portion is reduced. As a result, the height of the drain water that hits the second wall portion and rises along the second wall portion is lower, making it difficult for the drain water to reach the underside of the motor.

[0010] The drainage pump of the second aspect is the drainage pump of the first aspect, in which a lower drain outlet is provided between the lower end of the second wall portion and the outer peripheral edge of the lid portion, for discharging the drain water in the space to the outside.

[0011] In the drainage pump according to the second aspect, drain water within the space of the motor receiving member can be discharged to the outside from the lower drain outlet provided between the lower end of the second wall portion and the outer periphery of the lid portion.

[0012] A drainage pump according to a third aspect is the drainage pump according to the first aspect, wherein the outer wall is provided with an outer wall drain port for discharging the drain water in the space to the outside.

[0013] In the drainage pump according to the third aspect, water within the space of the motor receiving member can be discharged to the outside through the outer wall drain outlet provided in the outer wall of the motor receiving member.

[0014] A drainage pump according to a fourth aspect is the drainage pump according to the third aspect, wherein the outer wall drain port is provided in the second wall portion.

[0015] In the drainage pump according to the fourth aspect, water within the space of the motor receiving member can be discharged to the outside through the outer wall drain port provided in the second wall portion.

[0016] A drainage pump according to a fifth aspect is the drainage pump according to any one of the second to fourth aspects, wherein the lid portion has an upper surface that is inclined downward radially outward from the through hole.

[0017] In the drainage pump according to the fifth aspect, the upper surface of the lid is inclined downward radially outward from the through-hole, so that drain water on the upper surface of the lid can flow toward the drain outlet.

[0018] A drainage pump according to a sixth aspect is a drainage pump according to any one of the first to fifth aspects, comprising an engaging portion provided on one of the pump body and the motor receiving member, and an engaged portion provided on the other of the pump body and the motor receiving member and engaging with the engaging portion, wherein the second wall portion is provided on both the side opposite the discharge port side and the discharge port side, sandwiching the central portion, and the engaging portion and the engaged portion are provided on both sides of the central portion and at a position 90° circumferentially relative to the discharge port.

[0019] In the drainage pump according to the sixth aspect, the pump body and the motor receiving member can be connected to each other by engaging the locking portion with the locked portion. The locking portion and the locked portion are located on either side of the center of the lid portion and at a 90° circumferential angle relative to the discharge port, so that the pump body with the discharge port facing in a first direction can be rotated 180° to connect to the motor support member with the discharge port facing in the opposite direction to the first direction. In other words, the discharge port can be oriented in the first direction or in the direction opposite to the first direction without changing the orientation of the motor receiving member, and the same effect can be obtained even if the discharge port is oriented in the opposite direction. Effect of the Invention

[0020] According to the drainage pump of the present invention, backflowing drain water is less likely to hit the motor. [Brief description of the drawings]

[0021] [Figure 1] 1 is a partially cutaway front view showing a drainage pump according to a first embodiment of the present invention. [Diagram 2] 1 is a perspective view showing a drainage pump according to a first embodiment of the present invention, as viewed obliquely from above. [Diagram 3] FIG. 1 is a bottom view showing a drainage pump according to a first embodiment of the present invention. [Figure 4] 4 is a cross-sectional view of the drainage pump shown in FIG. 1 along line 4-4. [Diagram 5] FIG. 11 is a partially cut-away front view showing a drainage pump according to a conventional example. [Figure 6] 6 is a cross-sectional view of the drainage pump shown in FIG. 5 along line 6-6. [Figure 7] FIG. 11 is an explanatory diagram comparing water levels in pumps. [Figure 8] 1 is a partially cutaway front view showing a drainage pump according to a first embodiment of the present invention. [Figure 9] FIG. 6 is a partially cut-away front view of a drainage pump according to a second embodiment. [Figure 10] 10 is a cross-sectional view of the drainage pump shown in FIG. 9 along line 10-10. [Figure 11] FIG. 11 is a partially cross-sectional front view of a drainage pump according to a third embodiment. [Figure 12] FIG. 11 is a partially cut-away front view of a drainage pump according to a fourth embodiment. [Figure 13] FIG. 11 is a partially cross-sectional front view of a drainage pump according to a fifth embodiment. [Figure 14] FIG. 13 is a partially cross-sectional front view of a drainage pump according to a sixth embodiment. [Figure 15] FIG. 13 is a partially cut-away front view of a drainage pump according to a seventh embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] [First embodiment] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present disclosure will be described in detail with reference to the drawings.

[0023] As shown in FIGS. 1 to 3, the drainage pump 8 has a pump housing 10 as an example of a pump body made of synthetic resin, and a rotary vane 200 is housed in a pump chamber 10 b of the pump housing 10 .

[0024] As shown in FIG. 1, a lower cover (also called a housing cover) 40 made of synthetic resin is attached to the upper part of a pump housing 10 via an O-ring 30.

[0025] As shown in Figures 2 and 3, the lower cover 40 is removably attached to the pump housing 10 by a snap-fit ​​function, utilizing a snap-fit ​​type locking claw 14, which is an example of a locking portion provided on the pump housing 10, and a locked portion 15 provided on the lower cover 40. In other words, the snap-fit ​​function here is to mechanically fix the locking claw (holding portion) 14 by hooking it onto the lockable portion 15 on the receiving side using the elasticity of the material, and is a snap-fit ​​function of a general configuration.

[0026] A motor 100 is provided on the upper part of the lower cover 40, and the motor 100 is covered by an upper cover (also called a motor cover) 50 made of synthetic resin. The upper part of the upper cover 50 is provided with an attachment portion 52 for attachment to a mating member (not shown).

[0027] The upper cover 50 has snap-fit ​​type locking claws 54, and is attached to the lower cover 40 by a snap-fit ​​function that utilizes the elasticity of the synthetic resin. In other words, the snap-fit ​​function mechanically fixes the locking claw (holding portion) 54 on the upper cover 50 by hooking it onto the receiving portion 55 on the lower cover 40, utilizing the elasticity of the material; this is a snap-fit ​​function of a general configuration.

[0028] (Pump housing) The pump housing 10 is used to suck up drain water accumulated in a drain pan (not shown) and discharge it outside. As shown in FIG. 1, the pump housing 10 is formed in a cylindrical shape with a bottom and has a pump chamber 10b that houses a rotating blade 200, an intake port 10c that is provided at the bottom of the pump chamber 10b and extends downward from the pump chamber 10b, and a discharge port 10d that extends horizontally outward from the pump chamber 10b.

[0029] An upwardly extending riser pipe 16 is connected to the discharge port 10d.

[0030] (Rotary blades) The rotating blade 200 is molded from a synthetic resin and comprises a disk 200a, a cylindrical shaft portion 200b extending along the central axis of the disk 200a, a plurality of large diameter blades 200c formed on the upper surface of the disk 200a and extending along the radial direction, and a plurality of small diameter blades 200d formed on the lower surface of the disk 200a, inserted into the suction port 10c of the pump housing 10 and extending along the radial direction.

[0031] An upper end of the shaft portion 200b is connected to a rotor core body 100a of the motor 100, which is an example of a rotating shaft of the present disclosure, and the rotor blades 200 rotate as the rotor core body 100a rotates.

[0032] The rotary vane 200 is disposed inside the pump housing 10 so that the large diameter vane 200c faces the discharge port 10d, in other words, so that the discharge port 10d is located radially outward of the large diameter vane 200c.

[0033] (Top cover) The upper cover 50 is made of synthetic resin and is formed into a cylindrical shape with a lid. A motor 100 is housed inside the upper cover 50. A rotor core 100a that is connected to a rotor vane 200 inside the pump housing 10 protrudes downward from the motor 100.

[0034] (Lower cover) The lower cover 40 is provided to prevent water from adhering to the motor 100 from the outside, and, like the upper cover 50, is made of synthetic resin.

[0035] 1 and 2, the lower cover 40 includes a cylindrical outer wall 40a as an example of the outer wall of the present disclosure, and a disk-shaped bottom portion 40d having a through hole 40c formed in the center thereof through which the shaft portion 200b of the rotary vane 200 passes. The planar shape of the through hole 40c is a circle. The bottom portion 40d closes the upper opening of the pump housing 10. The shaft portion 200b of the rotating vane 200 penetrating the through hole 40c is an example of the rotating shaft of the present disclosure. The rotating shaft of the present disclosure penetrating the through hole 40c may be a separate member other than the rotor center body 100a and the shaft portion 200b, and may be at least a shaft-shaped member that transmits the rotational force of the motor 100 to the rotating vane 200.

[0036] An annular gap G that allows drain water and air to pass between the through hole 40c and the rotary blade 200. In addition, an annular gap G2 that allows drain water and air to pass between the lower end of the rotor center body 100a and the opening end of the through hole 40c is also provided.

[0037] 4, the cylindrical outer wall 40a includes a pair of arcuate portions 40aa as an example of a first wall portion, a pair of protruding portions 40ab as an example of a second wall portion, and a straight portion 40ac connecting the arcuate portions 40aa and the protruding portions 40ab. The arcuate portions 40aa have a constant radius of inner surface with the central axis of the cylindrical outer wall 40a as the center of the radius of curvature.

[0038] As shown in Figure 4, when viewed in a plane, the outer wall 40a has a portion that is short and a portion that is long radially from the center of a circular through hole 40c formed in the center of the bottom 40d, and the portion that is short radially from the center of the through hole 40c is an arc portion 40aa, and the portion that is long radially from the center of the through hole 40c than the arc portion 40aa is a protrusion 40ab.

[0039] The outer wall 40a of this embodiment has a constant cross-sectional shape from the lower end to the upper end. Therefore, the arc portion 40aa, the protruding portion 40ab, and the straight portion 40ac are parallel to the central axis of the cylindrical outer wall 40a. The central axis of the outer wall 40a passes through the center of the through hole 40. In other words, the outer wall 40a has a portion with a short radial distance from the central axis of the through hole 40c and a portion with a long radial distance from the central axis of the through hole 40c, and the portion with a short radial distance from the central axis of the through hole 40c is the arc portion 40aa, and the portion with a longer radial distance from the central axis of the through hole 40c than the arc portion 40aa is the protruding portion 40ab.

[0040] The protrusions 40ab are provided on the opposite side of the discharge port 10d with respect to the central axis of the outer wall 40a and on the discharge port 10d side with respect to the central axis. The protrusions 40ab of the present embodiment are an example of a second wall portion of the present disclosure.

[0041] The radius R1 of the inner surface of the arc portion 40aa is smaller than the radius R2 of the bottom portion 40d.

[0042] The protruding portion 40ab protrudes radially outward from the arc portion 40aa and the bottom portion 40d, and its inner surface is located radially outward from the outer periphery of the bottom portion 40d. Therefore, in the lower cover 40, a drain port 18 as an example of a lower drain port that communicates between the inside and outside of the lower cover 40 is opened between the lower end of the inner periphery of the protruding portion 40ab and the outer periphery of the bottom portion 40d. This drain port 18 can drain water accumulated in the lower cover 40 and prevent negative pressure from occurring inside the lower cover 40.

[0043] 2, the protrusion 40ab protrudes radially outward beyond the upper cover 50, and its inner surface is located radially outward beyond the upper cover 50. Therefore, in the lower cover 40, a vent hole 19 that communicates between the inside and outside of the lower cover 40 is opened between the upper end of the inner periphery of the protrusion 40ab and the outer periphery of the upper cover 50.

[0044] 1, the upper surface of the bottom portion 40d is slightly inclined so as to descend from the center toward the outside in the radial direction. In other words, the upper surface of the bottom portion 40d is inclined so that the wastewater accumulated on the bottom portion 40d flows toward the drain port 18. The drainage pump 8 of the present embodiment is used with the rotor central body 100a, which is an example of a rotating shaft of the present disclosure, and the shaft portion 200b being installed in an orientation along the vertical direction.

[0045] (Action, effect) Next, the operation and effects of the drainage pump 8 of this embodiment will be described. As an example, the drain pump 8 is disposed above a drain pan (not shown) when in use. The drain pump 8 can suck up drain water accumulated in the drain pan through the suction port 10c by rotating the rotary vanes 200 with the motor 100, and discharge the sucked up drain water to the outside through the discharge port 10d and the riser pipe 16 connected to the discharge port 10d.

[0046] When the rotation of the motor 100 is stopped, the drain water accumulated in the riser pipe 16, etc. flows back into the pump chamber 10b, and of the drain water that flows back into the pump chamber 10b, some of it is discharged downward from the suction port 10c, and the remaining part is sprayed into the inside of the lower cover 40 through the through hole 40c.

[0047] Since drain water is ejected from discharge port 10d in the direction of arrow L in the drawing, the drain water ejected from through hole 40c into lower cover 40 is ejected mainly in the direction of arrow W (approximately the direction of arrow L) as shown in Fig. 1. That is, the drain water ejected from through hole 40c into lower cover 40 is ejected toward protrusion 40ab on the side of arrow L that is located on the opposite side of discharge port 10d across through hole 40c.

[0048] Next, the operation and effect of the drainage pump 8 of this embodiment will be described in comparison with a pump 108 of a comparative example shown in Figures 5 and 6. In the pump 108 of the comparative example, the same components as those of the drainage pump 8 of this embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0049] As shown in Figures 5 and 6, the lower cover 140 of the pump 108 in the comparative example has a cylindrical shape of a constant diameter from the lower end to the upper end, and the inner radius R1 of the cylindrical shape is the same as the inner radius R1 of the arc portion 40aa of the lower cover 40 in this embodiment.

[0050] Figure 7 shows drain water W1 rising along the protrusion 40ab of the lower cover 40 of this embodiment, which is located on the opposite side (the direction of arrow L) from the outlet 10d (not shown in Figure 7), and drain water W2 rising along the outer wall 140a of the lower cover 140 of the comparative example.

[0051] Here, in the pump 108 of the comparative example, if the height of the upper end of the drain water rising along the outer peripheral wall 140a is H, and in the drain pump 8 of the embodiment, the height of the upper end of the drain water rising along the protruding portion 40ab is h, then h < H. In this embodiment, the height of the drain water rising along the wall can be suppressed to be lower than that of the comparative example.

[0052] This is because the distance from the through-hole 40c to the protruding portion 40ab in this embodiment is longer than that from the through-hole 40c to the outer peripheral wall 140a in the comparative example, so the momentum of the drain water hitting the inner surface of the outer wall becomes weaker.

[0053] Therefore, in the drain pump 8 of this embodiment, compared with the pump 108 of the comparative example, it is difficult for the drain water rising along the outer peripheral wall to reach the motor 100, and it is possible to suppress the problems of the motor 100 caused by the drain water hitting the motor 100.

[0054] Note that the drain water that has entered the inside of the lower cover 40 is discharged through the drain port 18 to a drain pan disposed below the drain pump 8.

[0055] Also, since the upper surface of the bottom portion 40d is inclined so as to descend from the central portion toward the drain port 18, the drain water that has entered the inside of the lower cover 40 flows toward the drain port 18, and it is suppressed that the drain water stays inside the lower cover 40.

[0056] In the drain pump 8 of this embodiment, the locking claw 14 for attaching the pump housing 10 to the lower cover 40 and the discharge port 10d are in a positional relationship of 90° around the axis of the pump housing 10 and the lower cover 40. Therefore, as shown in FIG. 8, without changing the orientation of the upper cover 50 compared to the first embodiment, in other words, without changing the attachment orientation of the drain pump 8, the orientation of the discharge port 10d can be changed by 180° and the pump housing 10 can be attached to the lower cover 40. Thereby, the degree of freedom in attaching the riser pipe 16 increases.

[0057] [Second Embodiment] Next, a drainage pump 8 according to a second embodiment of the present disclosure will be described. Note that the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted.

[0058] 9 and 10, in the lower cover 40 of this embodiment, a part of the bottom 40d protrudes radially outward and is connected to the lower end of the protruding part 40ab. Therefore, in this embodiment, the drainage hole 18 provided in the lower cover 40 of the first embodiment is blocked.

[0059] In the lower cover 40 of this embodiment, a drain outlet 20 as an example of a slit-shaped outer wall drain outlet extending along the axial direction of the lower cover 40 is formed in the protrusion 40ab in a direction away from the bottom 40d (in other words, in a direction from the lower cover 40 to the upper cover 50).

[0060] Therefore, in the drain pump 8 of the present embodiment, drain water that has entered the inside of the lower cover 40 can be discharged to the outside through the drain port 20 formed in the protruding portion 40ab.

[0061] [Third embodiment] Next, a drainage pump 8 according to a third embodiment of the present disclosure will be described. Note that the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted. As shown in FIG. 11, in the lower cover 40 of this embodiment, a protrusion 40ab is provided on the lower side (lower half) of the lower cover 40, and the upper side (an example of a first wall portion) of the lower cover 40ab is formed in a cylindrical shape.

[0062] The lower cover 40 of this embodiment, like the lower cover 40 of the first embodiment, can also suppress the height of drain water rising along the inner surface of the protrusion 40ab.

[0063] In addition, in the lower cover 40 of this embodiment, a step 42 is formed at the boundary between the protrusion 40ab and the cylindrical portion, so that drain water rising along the inner surface of the protrusion 40ab hits the step 42 which acts as a barrier, and the step 42 can suppress the rise of the drain water, making it less likely for the drain water to hit the motor 100 compared to the lower cover 40 of the first embodiment.

[0064] [Fourth embodiment] Next, a drainage pump 8 according to a fourth embodiment of the present disclosure will be described. Note that the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted.

[0065] As shown in FIG. 12, in the lower cover 40 of this embodiment, an inclined protrusion 44ad as an example of a second wall portion is provided on the lower side (lower half) of the lower cover 40, and the side above the protrusion 44ad (an example of a first wall portion) is formed in a cylindrical shape. In this embodiment, the protrusion 44ad is inclined so that the distance from the through hole 40c increases from the top to the bottom.

[0066] In the lower cover 40 of this embodiment, the protrusion 44ab is inclined, so that the drain water is less likely to rise along the protrusion 44ad compared to when it is not inclined, and the drain water is less likely to hit the motor 100 compared to the lower cover 40 of the first embodiment.

[0067] [Fifth embodiment] Next, a drainage pump 8 according to a fifth embodiment of the present disclosure will be described. Note that the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted. As shown in FIG. 13, in the lower cover 40 of this embodiment, a barrier 44 that protrudes inward is provided in the vertical middle portion of the protruding portion 40ab.

[0068] In the lower cover 40 of this embodiment, a barrier 44 is provided in the vertical middle of the protrusion 40ab, so that drain water rising along the inner surface of the protrusion 40ab hits the barrier 44, and the rise of the drain water can be suppressed by the barrier 44, making it less likely for the drain water to hit the motor 100 compared to the lower cover 40 of the first embodiment.

[0069] [Sixth embodiment] Next, a drainage pump 8 according to a sixth embodiment of the present disclosure will be described. Note that the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted. As shown in FIG. 14, in this embodiment, ten protrusions 40ae as examples of second wall portions of the same size and shape are provided circumferentially spaced apart on the outer wall 40a of the lower cover 40, with one protrusion 40ae being provided on the opposite side of the through hole 40c to the discharge port 10d, and another protrusion 40ae being provided on the discharge port 10d side. In this embodiment, the cross-sectional shape of the protrusion 40ae is substantially trapezoidal. In the drainage pump 8 of this embodiment as well, the protrusion 40ae is provided on the opposite side of the discharge port 10d, so that the height of the drain water rising along the inner surface of the protrusion 40ae can be suppressed.

[0070] [Seventh embodiment] Next, a drainage pump 8 according to a seventh embodiment of the present disclosure will be described. Note that the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted.

[0071] As shown in FIG. 15, in this embodiment, two wide protrusions 40ae', each having a longer circumferential dimension than the other protrusions 40ae, are provided on the outer wall 40a of the lower cover 40, both on the side opposite the discharge port 10d and on the discharge port 10d side of the through hole 40c.

[0072] In the drainage pump 8 of this embodiment, as in the sixth embodiment, a protrusion 40ae' is provided on the opposite side of the discharge port 10d, so that the height of the drain water rising along the inner surface of the protrusion 40ae' can be suppressed.

[0073] (Other embodiments) Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modified forms without departing from the spirit and scope of the present invention.

[0074] The shape of the rotary blade 200 is not limited to that shown in FIG. 1, and for example, an annular wall portion surrounding the large diameter blade 200c may be provided on the outer periphery of the large diameter blade 200c. [Explanation of symbols]

[0075] 8. Drainage Pump 10 Pump housing (pump body) 10c Intake port 10d outlet 10b Pump room 14 Locking claw (locking part) 15 Locked part 18 Drain port (lower drain port) 20 Drain port (exterior wall drain) 40 Lower cover (motor support part) 40a Exterior wall 40c through hole 40d Lid 40aa Arc section (first wall section) 40ab Projection part (second wall part) 40ad Projection (second wall) 40ae Projection (second wall) 100 Motor 100a Rotor center body (rotating shaft) 200 Rotor

Claims

1. a pump body including a suction port for sucking in drain water, a discharge port for discharging the drain water, and a pump chamber communicating with the suction port and the discharge port and housing a rotor blade therein, the discharge port being provided on a side of the pump chamber and having an open top; a motor provided above the pump body and configured to rotate the rotor blades; a motor receiving member including a lid portion provided between the pump body and the motor, the lid portion covering the opening of the pump body and having a through hole formed in the center thereof through which a rotating shaft passes and which transmits the rotational force of the motor to the rotating blades, and a cylindrical outer wall provided on an upper surface of the lid portion and supporting the motor from above, the motor receiving member forming an internal space surrounded by the motor, the lid portion, and the outer wall; Equipped with The outer wall has a first wall portion and a second wall portion that is radially distant from the center of the through hole compared to the first wall portion, The second wall portion is provided on the opposite side of the center portion from the discharge port. Drain pump.

2. A lower drain port is provided between a lower end of the second wall portion and an outer circumferential edge of the lid portion to discharge the drain water in the space to the outside. The drainage pump according to claim 1.

3. The outer wall is provided with an outer wall drain port for discharging the drain water in the space to the outside. The drainage pump according to claim 1.

4. The second wall portion is provided with the outer wall drain port. The drainage pump according to claim 3.

5. The lid portion has an upper surface that is inclined downward from the through hole toward the radially outer side. The drainage pump according to claim 2 or 3.

6. a locking portion provided on one of the pump body and the motor receiving member, and a locked portion provided on the other of the pump body and the motor receiving member, the locking portion engaging with the locking portion; the second wall portion is provided on both the opposite side to the discharge port side and the discharge port side across the center portion, The locking portion and the locked portion are provided on both sides of the center portion and at positions 90° in the circumferential direction with respect to the discharge port. The drainage pump according to claim 1.

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