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 Art

[0002] For example, the indoor unit of an air conditioner attached to the ceiling of a building stores the drain water generated during operation in a drain pan, sucks up the water with a drainage pump, and discharges it outdoors.

[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 having a suction port, a discharge port, and a pump chamber communicating therewith, a rotary impeller disposed in the pump chamber, a motor disposed above the pump chamber for rotating the rotary impeller, and a hollow case disposed between the motor and the pump chamber and having a bottom for closing the opening of the pump body. Further, a through-hole through which a shaft connecting the motor and the rotary impeller penetrates is formed in the bottom of the case.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the above-described indoor unit, when a configuration is adopted in which a pipe is connected to the discharge pipe and drain water is discharged to the outside through the pipe, when the driving of the drainage pump is stopped, the drain water in the pipe may flow backward into the drainage pump. When drain water flows back into the drain pump in this manner, the drain water is ejected almost horizontally through the through-hole in the opposite direction from the discharge port via the pump chamber. 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 bottom surface of the motor. For this reason, it is conceivable to set the height of the outer wall to a height that prevents the motor from being submerged in water, but this would require a larger drain pump.

[0006] The objective of the present invention is to provide a drain pump that prevents backflowing drain water from hitting the motor while suppressing the degree of increase in size. [Means for solving the problem]

[0007] A drain pump according to the first embodiment comprises a pump body having a suction port for drawing in drain water, a discharge port for discharging the drain water, and a pump chamber inside which a rotating blade is housed and which is in communication with the suction port and the discharge port, with the discharge port provided on the side of the pump chamber and the top of which is open; a motor provided above the pump body for rotating the rotating blade; a lid provided between the pump body and the motor, which covers the opening of the pump body and has a through hole in the center through which a rotating shaft that transmits the rotational force of the motor to the rotating blade passes; and a motor support member provided on the upper surface of the lid and having a cylindrical outer wall that supports the motor from above, forming a space inside surrounded by the motor, the lid, and the outer wall, wherein the outer wall has a first wall portion and a second wall portion which has a longer radial distance from the center of the through hole compared to 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 embodiment, a motor rotates a rotating impeller located inside the pump chamber, thereby drawing in drain water from the suction port and discharging it from the discharge port.

[0009] When the motor stops rotating, drain water downstream of the discharge port may flow back into the pump chamber and be ejected into the space of the motor support member through the through-hole. In this case, the direction of the drainage water ejected into the space from the through-hole is opposite to the discharge port side. However, since the second wall of the outer wall is farther from the center of the through-hole, the force of the drain water hitting the second wall is reduced. As a result, the height of the drain water that hits the second wall and rises along it becomes lower, making it difficult for the drain water to reach the bottom surface of the motor.

[0010] The drain pump according to the second embodiment is provided with a lower drain port between the lower end of the second wall portion and the outer edge of the lid portion for discharging the drain water in the space to the outside.

[0011] In the drain pump according to the second embodiment, drain water in the space of the motor support member can be discharged to the outside from the lower drain port provided between the lower end of the second wall and the outer edge of the lid.

[0012] The drainage pump according to the third embodiment is a drainage pump according to the first embodiment, 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 embodiment, water in the space of the motor support member can be discharged to the outside from an outer wall drain port provided on the outer wall of the motor support member.

[0014] The drainage pump according to the fourth embodiment is a drainage pump according to the third embodiment, wherein the second wall portion is provided with the outer wall drainage port.

[0015] In the drainage pump according to the fourth embodiment, water in the space of the motor support member can be discharged to the outside from the outer wall drain port provided in the second wall.

[0016] The fifth embodiment of the drainage pump is a drainage pump according to any one of the second to fourth embodiments, wherein the lid portion is inclined such that its upper surface slopes downward radially outward from the through hole.

[0017] In the drainage pump according to the fifth aspect, since the upper surface of the lid portion is inclined so as to descend from the through hole toward the radially outer side, the drain water on the upper surface of the lid portion can be made to flow toward the drain port.

[0018] The drainage pump according to the sixth aspect is a drainage pump according to any one of the first aspect to the fifth aspect, and includes a locking portion provided on either the pump body or the motor receiving member, and the pump body and the motor receiving member. It is provided on the other of the above, and includes a locked portion that engages with the locking portion. The second wall portion is provided on both the opposite side and the discharge port side of the discharge port side with respect to the central portion, and the locking portion and the locked portion are provided on both sides with respect to the central portion and at positions 90° in the circumferential direction with respect to the discharge port.

[0019] The drainage pump according to the sixth aspect can connect the pump body and the motor receiving member to each other by engaging the locking portion and the locked portion. Since the locking portion and the locked portion are provided on both sides with respect to the central portion of the lid portion and at positions 90° in the circumferential direction with respect to the discharge port, the pump body with the discharge port facing in the first direction is rotated 180°, and the discharge port is rotated. It can be connected to the motor receiving member with the opening facing in the opposite direction to the first direction. In other words, without changing the orientation of the motor receiving member, the discharge port can be oriented in the first direction or in the direction opposite to the first direction, and the same effect can be obtained even if it is switched to the opposite orientation.

Effects of the Invention

[0020] According to the drainage pump of the present invention, it becomes difficult for the backflow drain water to hit the motor.

Brief Description of the Drawings

[0021] [Figure 1] It is a front view showing a part of the drainage pump according to the first embodiment of the present invention in cross section. [Figure 2] It is a perspective view of the drainage pump according to the first embodiment of the present invention as seen obliquely from above. [Figure 3] Bottom view showing a drainage pump according to a first embodiment of the present invention. [Figure 4] Cross-sectional view taken along line 4-4 of the drainage pump shown in FIG. 1. [Figure 5] Front view showing a part of a cross-section of a drainage pump according to a conventional example. [Figure 6] Cross-sectional view taken along line 6-6 of the drainage pump shown in FIG. 5. [Figure 7] Explanatory drawing comparing the water levels inside the pump. [Figure 8] Front view showing a part of a cross-section of a drainage pump according to a first embodiment of the present invention. [Figure 9] Front view showing a part of a cross-section of a drainage pump according to a second embodiment. [Figure 10] Cross-sectional view taken along line 10-10 of the drainage pump shown in FIG. 9. [Figure 11] Front view showing a part of a cross-section of a drainage pump according to a third embodiment. [Figure 12] Front view showing a part of a cross-section of a drainage pump according to a fourth embodiment. [Figure 13] Front view showing a part of a cross-section of a drainage pump according to a fifth embodiment. [Figure 14] Front view showing a part of a cross-section of a drainage pump according to a sixth embodiment. [Figure 15] Front view showing a part of a cross-section of a drainage pump according to a seventh embodiment.

Mode for Carrying Out the Invention

[0022] [First Embodiment] The mode for carrying out the present disclosure will be described in detail while referring 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 rotating impeller 200 is accommodated in the pump chamber 10b of the pump housing 10.

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

[0025] As shown in Figures 2 and 3, the lower cover 40 is detachably attached to the pump housing 10 by a snap-fit ​​function using a snap-fit ​​type locking claw 14, which is an example of a locking part provided on the pump housing 10, and a locking part 15 provided on the lower cover 40. In other words, the snap-fit ​​function here mechanically secures the locking claw (holding part) 14 by using the elasticity of the material to hook onto the receiving part 15, and is a typical snap-fit ​​function.

[0026] A motor 100 is mounted 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 a mounting portion 52 for attaching to a mating member (not shown).

[0027] The upper cover 50 has snap-fit ​​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 secures the upper cover 50 by hooking the locking claw (holding part) 54 provided on the upper cover 50 onto the receiving locking part 55 provided on the lower cover 40 using the elasticity of the material, and is a snap-fit ​​function with a general configuration.

[0028] (Pump housing) The pump housing 10 is for sucking up the drain water accumulated in the drain pan (not shown) and draining it outside. As shown in Figure 1, it is formed in a bottomed cylindrical shape and includes a pump chamber 10b that houses the rotating blades 200, a suction port 10c located at the bottom of the pump chamber 10b and extending downward from the pump chamber 10b, and a discharge port 10d extending horizontally outward from the pump chamber 10b.

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

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

[0031] The upper end of the shaft portion 200b is connected to the rotor central body 100a, which is an example of the rotating shaft of the motor 100, and the rotation of the rotor central body 100a causes the rotating blades 200 to rotate.

[0032] The rotating blades 200 are positioned inside the pump housing 10 such that the large-diameter blades 200c face the discharge port 10d, or in other words, the discharge port 10d is located radially outward of the large-diameter blades 200c.

[0033] (Top cover) The upper cover 50 is molded from synthetic resin into a covered cylindrical shape. A motor 100 is housed inside the upper cover 50. A rotor central body 100a, which is connected to the rotating blades 200 inside the pump housing 10, protrudes downward from the motor 100.

[0034] (Bottom 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, it is molded from synthetic resin.

[0035] As shown in Figures 1 and 2, the lower cover 40 comprises a cylindrical outer wall 40a, which is an example of an outer wall of the present disclosure, and a disc-shaped bottom portion 40d through which a through hole 40c is drilled in the center, through which the shaft portion 200b of the rotating blade 200 passes. The planar shape of the through hole 40c is circular. The bottom portion 40d closes the upper opening of the pump housing 10. The shaft portion 200b of the rotating blade 200 that passes through the through hole 40c is an example of the rotating shaft of this disclosure. The rotating shaft of this disclosure that passes through the through hole 40c may be a separate member other than the rotor central body 100a and the shaft portion 200b, and at least it should be an axial member that transmits the rotational force of the motor 100 to the rotating blade 200.

[0036] Furthermore, an annular gap G is provided between the through-hole 40c and the rotating blade 200 to allow drain water and air to pass through. Additionally, an annular gap G2 is provided between the lower end of the rotor central body 100a and the open end of the through-hole 40c to allow drain water and air to pass through.

[0037] As shown in the cross-sectional view of Figure 4, the cylindrical outer wall 40a comprises a pair of arc sections 40aa as an example of a first wall section, a pair of protruding sections 40ab as an example of a second wall section, and a straight section 40ac connecting the arc sections 40aa and the protruding sections 40ab. The radius of the inner surface of the arc section 40aa is constant with the central axis of the cylindrical outer wall 40a as the center of the radius of curvature.

[0038] As shown in Figure 4, the outer wall 40a, in a plan view, has a portion with a short radial distance from the center of the circular through-hole 40c formed in the center of the bottom portion 40d and a portion with a long radial distance from the center of the through-hole 40c. The portion with a short radial distance from the center of the through-hole 40c is the arc portion 40aa, and the portion with a longer radial distance from the center of the through-hole 40c than the arc portion 40aa is the protruding portion 40ab.

[0039] In this embodiment, the outer wall 40a has a constant cross-sectional shape from the lower end to the upper end. Therefore, the arc portion 40aa, the projection 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 through hole 40c has a portion with a short radial distance from the central axis and a portion with a long radial distance from the central axis of the through hole 40c, 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 projection portion 40ab.

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

[0041] The radius R1 on 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 edge of the bottom portion 40d. Therefore, the lower cover 40 has a drain port 18, which is an example of a lower drain port that connects the inside and outside of the lower cover 40, opening between the lower end of the inner circumference of the protruding portion 40ab and the outer edge of the bottom portion 40d. This drain port 18 can discharge water accumulated inside the lower cover 40 and prevent negative pressure from forming inside the lower cover 40.

[0043] As shown in Figure 2, the protruding portion 40ab protrudes radially outward from the upper cover 50, and its inner surface is located radially outward from the upper cover 50. For this reason, a ventilation opening 19 is provided in the lower cover 40 between the upper end of the inner circumference of the protruding portion 40ab and the outer edge of the upper cover 50, allowing communication between the inside and outside of the lower cover 40.

[0044] As shown in Figure 1, the upper surface of the bottom 40d is slightly sloped downwards radially outward from the center. In other words, the upper surface of the bottom 40d is sloped so that the drainage accumulated on top of the bottom 40d flows towards the drain outlet 18. In this embodiment, the drainage pump 8 is used with the rotor central body 100a and shaft portion 200b, which are examples of the rotating shafts of this disclosure, installed in a position aligned with the vertical direction.

[0045] (Effect, Action) Next, the operation and effects of the drainage pump 8 of this embodiment will be explained. The drain pump 8 is used, for example, positioned above a drain pan (not shown). The drain pump 8 rotates a rotor 200 with a motor 100 to draw up the drain water accumulated in the drain pan through the suction port 10c, and can drain the drawn-up drain water outside through the discharge port 10d and the riser pipe 16 connected to the discharge port 10d.

[0046] When the motor 100 stops rotating, the drain water accumulated in the riser pipe 16 etc. flows back into the pump chamber 10b. Some of the drain water that flows back into the pump chamber 10b is discharged downward from the suction port 10c, and the remaining portion is ejected into the lower cover 40 through the through hole 40c.

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

[0048] Next, the operation and effects of the drainage pump 8 of this embodiment will be explained in comparison with the comparative example pump 108 shown in Figures 5 and 6. In the comparative example pump 108, the same reference numerals are used for components identical to those in the drainage pump 8 of this embodiment, and their descriptions are omitted.

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

[0050] Figure 7 shows drain water W1 rising along the protruding portion 40ab of the lower cover 40 in this embodiment, which is located on the opposite side (in the direction of arrow L) from the discharge port 10d (not shown in Figure 7), and drain water W2 rising along the outer peripheral wall 140a of the lower cover 140 in 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 protrusion 40ab is h, then h < H. In this embodiment, the height of the drain water rising along the wall can be suppressed lower compared to the comparative example.

[0052] This is because the distance from the through-hole 40c to the protrusion 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 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 possible to suppress the drain water from staying 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 mounting 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. This increases the degree of freedom in attaching the riser pipe 16.

[0057] [Second Embodiment] Next, a drain pump 8 according to the second embodiment of this disclosure will be described. Note that components identical to those in the first embodiment are denoted by the same reference numerals, and their descriptions are omitted.

[0058] As shown in Figures 9 and 10, in this embodiment, a portion of the bottom 40d of the lower cover 40 protrudes radially outward and is connected to the lower end of the protruding portion 40ab. Therefore, the drain port 18 that was provided in the lower cover 40 of the first embodiment is closed.

[0059] In the lower cover 40 of this embodiment, a drainage port 20, which is an example of a slit-shaped outer wall drainage port extending along the axial direction of the lower cover 40, is formed on the protruding portion 40ab in a direction away from the bottom portion 40d (in other words, in the direction from the lower cover 40 toward the upper cover 50).

[0060] Therefore, in the drain pump 8 of this embodiment, drain water that enters the interior 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 drain pump 8 according to a third embodiment of this disclosure will be described. Components identical to those in the first embodiment are denoted by the same reference numerals, and their descriptions will be omitted. As shown in Figure 11, in the lower cover 40 of this embodiment, the protrusion 40ab is provided on the lower side (lower half) of the lower cover 40, and the part above the protrusion 40ab (an example of the first wall portion) is formed in a cylindrical shape.

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

[0063] Furthermore, in the lower cover 40 of this embodiment, a step 42 is formed at the boundary between the protruding portion 40ab and the cylindrical portion. As a result, the drain water rising along the inner surface of the protruding portion 40ab hits the step 42, which acts as a barrier. This prevents the drain water from rising, 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 drain pump 8 according to a fourth embodiment of this disclosure will be described. Components identical to those in the first embodiment are denoted by the same reference numerals, and their descriptions will be omitted.

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

[0066] In this embodiment, the lower cover 40 has an inclined projection 44ab, which makes it more difficult for drain water to rise along the projection 44ad compared to when it is not inclined, and makes it less likely for drain water to hit the motor 100 compared to the lower cover 40 of the first embodiment.

[0067] [Fifth Embodiment] Next, a drain pump 8 according to a fifth embodiment of this disclosure will be described. Note that components identical to those in the first embodiment are denoted by the same reference numerals, and their descriptions are omitted. As shown in Figure 13, in the lower cover 40 of this embodiment, a barrier 44 that protrudes inward is provided in the middle of the protruding portion 40ab in the vertical direction.

[0068] In this embodiment, since a barrier 44 is provided in the middle of the protruding portion 40ab in the vertical direction, the drain water rising along the inner surface of the protruding portion 40ab hits the barrier 44, thus suppressing the rise of the drain water, and 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 drain pump 8 according to the sixth embodiment of this disclosure will be described. Components identical to those in the first embodiment are denoted by the same reference numerals, and their descriptions will be omitted. As shown in Figure 14, in this embodiment, the outer wall 40a of the lower cover 40 is provided with 10 protrusions 40ae, which are examples of second wall portions of the same size and shape, spaced apart in the circumferential direction. One of these protrusions 40ae is provided on the side opposite the discharge port 10d relative to the through hole 40c, and another protrusion 40ae is provided on the side of the discharge port 10d. The cross-sectional shape of the protruding portion 40ae in this embodiment is approximately trapezoidal. In the drain pump 8 of this embodiment, a protrusion 40ae is provided on the opposite side of the discharge port 10d, so the height of the drain water rising along the inner surface of the protrusion 40ae can be suppressed.

[0070] [Seventh Embodiment] Next, a drain pump 8 according to the seventh embodiment of this disclosure will be described. Components identical to those in the first embodiment are denoted by the same reference numerals, and their descriptions will be omitted.

[0071] As shown in Figure 15, in this embodiment, the outer wall 40a of the lower cover 40 has two wide protrusions 40ae' which are longer in the circumferential direction than the other protrusions 40ae, provided on both the side opposite to the discharge port 10d and the side of the through hole 40c that is the discharge port 10d.

[0072] In the drain 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, it goes without saying that the present invention is not limited to the above, and can be implemented in various ways without departing from the spirit of the invention.

[0074] The rotating blades 200 are not limited to the shape shown in Figure 1. For example, an annular wall portion surrounding the large-diameter blade 200c may be provided on the outer circumference of the large-diameter blade 200c. [Explanation of Symbols]

[0075] 8. Drainage pump 10 Pump housing (pump body) 10c Inlet 10d outlet 10b Pump Room 14. Locking claw (locking part) 15 Locked part 18 Drain port (lower drain port) 20 Drain port (outer wall drain port) 40 Lower cover (motor support component) 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 (rotation axis) 200 rotations per minute blade

Claims

1. A pump body comprising a suction port for drawing in drain water, a discharge port for discharging the drain water, and a pump chamber inside which a rotating impeller is housed, communicating with the suction port and the discharge port, the discharge port being located on the side of the pump chamber and having an open top, A motor is provided above the pump body to rotate the rotating blades, A motor support member is provided between the pump body and the motor, having a lid that covers the opening of the pump body and has a through hole in its center through which a rotating shaft that transmits the rotational force of the motor to the rotating blades passes, and a cylindrical outer wall provided on the upper surface of the lid that supports the motor from above, forming a space inside surrounded by the motor, the lid, and the outer wall. Equipped with, The outer wall has a first wall portion and a second wall portion which has a longer radial distance from the center of the through hole compared to the first wall portion. The second wall portion is provided on the side opposite to the discharge port, with the central part in between. Drainage pump.

2. A lower drain port is provided between the lower end of the second wall portion and the outer peripheral 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 outlet 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 drainage port. The drainage pump according to claim 3.

5. The lid portion is inclined such that its upper surface slopes downward radially outward from the through hole. The drainage pump according to claim 2 or claim 3.

6. The pump body and the motor receiving member are provided with a locking portion on either one of them, and a locked portion is provided on the other of the pump body and the motor receiving member, which engages with the locking portion. The second wall portion is provided on both the side opposite to the discharge port and the side of the discharge port, with the central portion in between. The locking portion and the locked portion are provided on both sides of the central part and at a 90° angle in the circumferential direction with respect to the discharge port. The drainage pump according to claim 1.

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