阅读说明：本技术 排水泵 (Water discharge pump ) 是由 佐藤克司 加藤友也 佐藤永 于 2018-06-25 设计创作，主要内容包括：本件发明提供一种排水泵，该排水泵即使在被小型化的情况下也能够防止水浸入到电动机内。为此，本件发明的排水泵具备：电动机，该电动机具有转子及定子；电动机下罩，该电动机下罩覆盖电动机的下部的至少一部分；旋转叶片部件，该旋转叶片部件以能够传递动力的方式与转子连接；以及泵壳体，该泵壳体具有收容旋转叶片部件的泵室。在泵壳体的上壁设置有贯通孔。另外，电动机下罩具备防水壁部，该防水壁部配置于电动机与泵壳体的上壁之间。(The invention provides a drain pump which can prevent water from entering into a motor even if the drain pump is miniaturized. To this end, the drain pump according to the present invention includes: an electric motor having a rotor and a stator; a motor lower cover covering at least a portion of a lower portion of the motor; a rotating blade member connected to the rotor so as to be capable of transmitting power; and a pump housing having a pump chamber that houses the rotary blade member. The upper wall of the pump housing is provided with a through hole. The motor lower cover includes a waterproof wall portion disposed between the motor and the upper wall of the pump housing.)

1. A drain pump is characterized by comprising:

an electric motor having a rotor and a stator;

a motor lower cover covering at least a portion of a lower portion of the motor;

a rotating blade member connected to the rotor so as to be capable of transmitting power; and

a pump housing having a pump chamber that houses the rotary blade member,

the upper wall of the pump shell is provided with a through hole,

the motor lower cover includes a waterproof wall portion disposed between the motor and the upper wall of the pump housing.

2. A drain pump according to claim 1,

the waterproof wall portion is an inward flange portion that protrudes radially inward from a side wall of the motor lower cover.

3. A drain pump according to claim 1 or 2,

the rotor has a rotor flange that prevents water from infiltrating into a gap between the rotor and the stator,

a labyrinth passage is formed by the rotor flange and the waterproof wall portion.

4. A drain pump according to claim 3,

the rotor flange is disposed opposite at least a portion of a lower surface of the stator.

5. Drain pump according to any of claims 1-4,

a space is provided between the motor lower cover and the upper wall of the pump housing,

the space is open and not covered by walls.

6. Drain pump according to any of claims 1-5,

the motor lower cover is provided with a first clamping part,

the pump housing is provided with a second clamping part,

the motor lower cover and the pump housing are detachably connected to each other via the first engaging portion and the second engaging portion.

7. Drain pump according to any of claims 1-6,

the rotating blade member includes:

a plurality of plate members including an upper plate and a lower plate;

a large-diameter blade disposed between the upper plate and the lower plate; and

a small-diameter blade disposed below the lower plate,

a side opening is formed between the upper plate and the lower plate,

the upper plate has a first hole through which fluid can pass,

the lower plate has a second hole through which a fluid can pass.

8. A drain pump according to claim 7,

the plurality of plate members include a middle plate disposed between the upper plate and the lower plate,

the middle plate has a third aperture through which fluid can pass.

9. A drain pump according to claim 7 or 8,

the upper surfaces of the plurality of plate members are inclined surfaces.

Technical Field

The present invention relates to a drain pump, and more particularly, to a technique for preventing water from entering a motor.

Background

For example, in a drain pump incorporated in an indoor unit of an air conditioner for discharging drain water generated in an evaporator to the outside during cooling or dehumidification, when the drain pump is stopped from a state in which the drain pump is driven to drain water, the drain water accumulated in a drain outlet stand pipe or the like flows backward toward a pump chamber of the drain pump (i.e., a space in which a rotary vane for drainage is accommodated). Due to this reverse flow, the discharged water is blown out from the gap between the rotating shaft of the rotary vane and the through hole formed in the ceiling of the pump chamber for inserting the rotating shaft toward the motor for driving the rotary vane and adheres to the motor, and there is a possibility that the durability and the like of the motor are affected.

As a related art, patent document 1 discloses a motor for a drain pump. In the electric motor for a drain pump described in patent document 1, a flange portion that prevents water from entering the magnetic rotor is provided below the magnetic rotor.

Disclosure of Invention

Therefore, an object of the present invention is to provide a drain pump comprising: even when the drain pump is miniaturized, water can be prevented from entering the motor.

In order to achieve the above object, a drain pump according to the present invention includes: an electric motor having a rotor and a stator; a motor lower cover covering at least a portion of a lower portion of the motor; a rotating blade member connected to the rotor so as to be capable of transmitting power; and a pump housing having a pump chamber that houses the rotating blade member. The upper wall of the pump housing is provided with a through hole. The motor lower cover includes a waterproof wall portion disposed between the motor and the upper wall of the pump housing.

In the drain pump, the waterproof wall portion may be an inward flange portion that protrudes radially inward from a side wall of the motor lower cover.

In the drain pump, the rotor may be provided with a rotor flange that prevents water from entering a gap between the rotor and the stator. Further, a labyrinth passage may be formed by the rotor flange and the waterproof wall portion.

In the drain pump described above, the rotor flange may also be disposed so as to oppose at least a portion of a lower surface of the stator.

In the drain pump described above, a space may be provided between the motor lower cover and the upper wall of the pump housing. In addition, the space may be open without being covered by a wall.

In the drain pump, the motor lower cover may have a first engaging portion, and the pump housing may have a second engaging portion. Further, the motor lower cover and the pump housing may be detachably connected to each other via the first engaging portion and the second engaging portion.

In the drain pump, the rotary blade member may include: a plurality of plate members including an upper plate and a lower plate; a large-diameter blade disposed between the upper plate and the lower plate; and a small-diameter blade disposed below the lower plate. A side opening may also be formed between the upper plate and the lower plate. The upper plate may have a first hole through which a fluid can pass, and the lower plate may have a second hole through which a fluid can pass.

In the drain pump, the plurality of plate members may include an intermediate plate disposed between the upper plate and the lower plate. The middle plate may also have a third aperture through which fluid can pass.

In the drain pump, an upper surface of each of the plurality of plate members may be an inclined surface.

According to the present invention, there can be provided a drain pump as follows: even when the drain pump is miniaturized, water can be prevented from entering the motor.

Drawings

Fig. 1 is a schematic diagram for explaining water return.

Fig. 2 is a schematic diagram for explaining the through-hole.

Fig. 3 is a sectional view schematically showing a drain pump according to an embodiment.

Fig. 4 is a schematic perspective view of the drain pump according to the embodiment.

Fig. 5 is a sectional view schematically showing a drain pump according to an embodiment.

Fig. 6A is a schematic plan view showing an example of a rotary vane member of the drain pump according to the embodiment.

Fig. 6B is a schematic side view showing an example of a rotary vane member of the drain pump according to the embodiment.

Fig. 7 is a schematic perspective view showing a first modification of the rotary vane member of the drain pump according to the embodiment.

Fig. 8 is a schematic plan view and a schematic front view of a rotating blade member according to a first modification.

Fig. 9 is a bottom view of the rotating blade member according to the first modification.

Fig. 10 is a schematic view showing a state in which water moves across a large-diameter blade.

Fig. 11 is a front view of the rotating blade member according to the first modification, and is a schematic diagram for explaining the gas-liquid boundary surface.

Fig. 12 is a sectional view taken along line a-a of fig. 8.

Fig. 13 is a sectional view taken along line B-B of fig. 8.

Fig. 14 is a sectional view taken along line C-C of fig. 8.

Fig. 15 is a schematic perspective view showing a second modification of the rotary vane member of the drain pump according to the embodiment.

Fig. 16 is a plan view and a front view of a rotating blade member according to a second modification example.

Fig. 17 is a sectional view taken along line D-D of fig. 16.

Fig. 18 is a sectional view taken along line E-E of fig. 16.

Detailed Description

Hereinafter, a drain pump according to an embodiment will be described with reference to the drawings. In the following description of the embodiments, the same reference numerals are given to parts and components having the same functions, and redundant description of the parts and components given the same reference numerals is omitted.

(relating to backwater)

The water return is explained with reference to fig. 1. Fig. 1 is a schematic diagram for explaining water return.

In the example shown in fig. 1, drain pump 1 is connected to drain pipe 101. The drain pump 1 sucks water from the suction port 68 and discharges the water from the discharge port 69. When the drain pump is operated, water is drained from the drain 69, and therefore the drain pipe 101 is filled with water. It is assumed that the drain pump is stopped in this state. In this case, the water in the drain pipe 101 flows backward toward the drain pump 1 by gravity. As a result, water flows into the pump chamber from the discharge port 69. In the present specification, the water flowing into the pump chamber from the discharge port 69 is referred to as "return water".

(concerning through-hole)

Next, the through-hole 61 will be described with reference to fig. 2. Fig. 2 is a schematic diagram for explaining the through-hole 61.

The through hole 61 is a hole that communicates the pump chamber PS with the space SP above the pump chamber PS. The through hole 61 is inserted with a shaft 7 (e.g., an output shaft of a motor) for rotating the rotary blade member 5. When the drain pump 1 is started, water enters the pump chamber PS. When water enters the pump chamber, air present in the pump chamber is pushed out to the space SP through the through hole 61 (see arrow a). In fig. 2, symbol BS represents a boundary surface between water and air.

In the state shown in fig. 2, when the drain pump 1 is stopped, the water that has filled the drain pipe flows into the pump chamber from the discharge port 69 as the return water. A part of the return water flowing into the pump chamber is discharged from the suction port 68, and the other part of the return water flows out to the space SP through the through hole 61. In drain pump 1 of the embodiment, the water flowing out of space SP is prevented from entering the motor. The details will be described later.

(outline of embodiment)

An outline of drain pump 1 in the embodiment will be described with reference to fig. 3. Fig. 3 is a cross-sectional view schematically showing the drain pump 1 in the embodiment.