KR102183341B1 - Drain pump - Google Patents

Abstract

An object of the present invention is to provide a drainage pump capable of reducing the amount of water outflow into a chamber positioned above the pump chamber. In order to achieve the above object, the drainage pump of the present invention includes a motor support member having a rotating blade, a pump body having a first chamber in which the rotating blade is accommodated, and a second chamber disposed above the first chamber, A motor, a partition wall disposed between the first chamber and the second chamber, a through hole provided in the partition wall, and a shaft disposed through the through hole are provided. The partition wall has a ring-shaped body portion and a water flow guiding surface provided on a lower surface of an inner portion of the ring-shaped body portion. The water flow guiding surface defines a concave space that is recessed above the lower surface of the outer portion of the ring-shaped body portion. The water flow guiding surface guides the water flow flowing into the concave space toward a horizontal direction or an oblique downward direction.

Description

Drain pump

TECHNICAL FIELD [0001] The present invention relates to a drainage pump, and more particularly, to a technique for reducing the amount of water outflow to a drive motor side located above a pump chamber in which a rotary blade is disposed.

For example, in a drain pump that is assembled in an air conditioner and is used to drain the drain water generated from the evaporator to the outside during cooling or dehumidification, when the drain pump is stopped from the state of the drive drainage. , Drain water accumulated in the discharge port of the drain water, etc., flows back toward the pump chamber of the drain pump (that is, the space in which the rotating blade for drainage is accommodated). Due to this reverse flow, drain water is taken out from the gap between the rotation shaft of the rotor blade and the through hole formed in the ceiling of the pump chamber for inserting the rotation shaft, and attached to the motor side (in the room) for driving the rotor blade, There is a risk of affecting the durability of the motor.

In order to prevent such a situation, in Patent Document 1, a disk-shaped receiving plate is provided on the rotating shaft above the through hole to prevent the discharged drain water from adhering to the motor or the like.

Patent Document 1: Japanese Unexamined Patent Publication No. 2010-275972

In recent years, miniaturization and high performance of the inside of the air conditioning room are being pursued, and in response to this, miniaturization and high performance of the drain pump are also required.

In the case of miniaturization of the drainage pump (especially in the direction of the rotation axis of the rotating blade), it is necessary to shorten the distance from the pump chamber to the drive motor, and in the case of attempting to increase performance (high efficiency), the amount of displacement per unit time Or more

It is necessary to increase the lifting capacity of drain water.

However, in order to achieve miniaturization and high performance of the drainage pump in this way, simply by providing the water-receptor plate shown in Patent Document 1, it is impossible to completely prevent the backflow of drain water from scattering to the motor when the drainage pump is stopped. There is a fear that there is no.

Therefore, an object of the present invention is to provide a drainage pump capable of reducing the amount of water outflow into a chamber positioned above the pump chamber.

In order to achieve the above object, the drain pump according to the present invention includes a pump body having a rotating blade and a first chamber in which the rotating blade is accommodated, and a fluid that is disposed above the pump body and flowing out from the first chamber. A motor supporting member having a second chamber capable of discharging to the outside, a motor supported by the motor supporting member, a partition wall disposed between the first chamber and the second chamber, a through hole provided in the partition wall, and the It is disposed through the through hole, and includes a shaft for transmitting the rotational force from the motor to the rotary blade. The partition wall has a ring-shaped body portion and a water flow guiding surface provided on a lower surface of an inner portion of the ring-shaped body portion. The water flow guiding surface defines a concave space recessed above the lower surface of the outer portion of the ring-shaped main body.

The water flow guiding surface guides the water flow flowing into the concave space toward a horizontal direction or an oblique downward direction.

In the drainage pump in some embodiments, when the depth of the concave space is defined as the depth (D1), and the width of the concave space is defined as the width (W1), the depth (D1) is the width (W1) It may be less than twice as much.

In the drainage pump in some embodiments, the angle formed between the water flow guiding surface and the vertical axis at the inner edge portion of the water flow guiding surface may be greater than 0° and 90° or less.

In the drainage pump in some embodiments, the water flow guiding surface may include a water flow direction changing portion that changes the water flow direction. The water flow direction changing part may be located above the inner edge part.

In the drainage pump according to some embodiments, the water flow guiding surface may have an outer surface positioned outside the water flow direction changing portion, and an inner surface positioned inside the water flow direction changing portion. The outer surface may be a surface whose inclination changes toward the inner diameter direction.

In the drainage pump in some embodiments, the water flow guide surface is an inflection point between a point located at the top of the water flow guide surface and a lower surface of the outer portion of the ring-shaped body portion. You may have

In the drainage pump in some embodiments, the water flow guiding surface may have a convex curved surface.

In the drainage pump in some embodiments, a receiving plate supported by the shaft may also be provided. The water-receiving plate may be disposed in the second chamber.

According to the present invention, it is possible to provide a drain pump capable of reducing the amount of water outflow into a chamber positioned above the pump chamber.

1 is a schematic diagram for explaining the number of feedbacks.
2 is a schematic diagram for explaining an air introduction hole.
Fig. 3 is a partially notched side view schematically showing the drainage pump in the first embodiment.
Fig. 4 is a cross-sectional view of a portion in the vicinity of the water flow guiding surface, in a cross-sectional view including the central axis of the shaft.
Fig. 5 is a diagram schematically showing the results of an experiment conducted using a drainage pump in the first embodiment.
Fig. 6 is a diagram schematically showing results of an experiment conducted using a drainage pump in a comparative example.
Fig. 7 is a partially notched side view schematically showing an example of the overall configuration of the drainage pump in the first embodiment.
8 is a schematic perspective view showing an example of a rotating blade member.
Fig. 9 is a cross-sectional view of a portion in the vicinity of the water flow guiding surface in the first modification example, in a cross-sectional view including the central axis of the shaft.
Fig. 10 is a cross-sectional view of a portion in the vicinity of a water flow guiding surface in a second modification example, in a cross-sectional view including a central axis of the shaft.
Fig. 11 is a cross-sectional view of a portion in the vicinity of the water flow guiding surface in the third modification example, in a cross-sectional view including the central axis of the shaft.
12 is a cross-sectional view of a portion in the vicinity of the water flow guiding surface in the fourth modification example, in a cross-sectional view including the central axis of the shaft.
Fig. 13 is a cross-sectional view of a portion in the vicinity of the water flow guiding surface in the fifth modification example, in a cross-sectional view including the central axis of the shaft.

Hereinafter, a drainage pump according to an embodiment will be described with reference to the drawings. In addition, in the description of the following embodiments, the same reference numerals are used for portions and members having the same function, and repeated descriptions of portions and members having the same reference numerals are omitted.

(Regarding the number of returns)

Referring to Fig. 1, the feedback number will be described. 1 is a schematic diagram for explaining the number of feedbacks.

In the example shown in FIG. 1, the drainage pump 1 is connected to the drain hose 2. The drainage pump 1 sucks water from the suction port 3 and discharges water from the discharge port 4. During the operation of the drain pump, water is discharged from the discharge port 4, so that the drain hose 2 is filled with water. In this state, it is assumed that the drainage pump is stopped. In this case, the water in the drain hose 2 flows back toward the drainage pump 1 by gravity. As a result, water flows into the pump chamber from the discharge port 4. Water flowing into the pump chamber from the discharge port 4 is referred to as "return water" in this specification.

(Regarding the air inlet hole)

Next, referring to FIG. 2, an air introduction hole, which is the through hole 5, will be described. 2 is a schematic diagram for explaining an air introduction hole.

The air introduction hole (through hole 5) is a hole that communicates the pump chamber, which is the first chamber 6, and the second chamber 7 located above the pump chamber. A shaft 9 for rotating the rotary blade 80 is inserted into the air introduction hole (through hole 5). When the drainage pump 1 starts up, water enters the pump chamber (first chamber 6). When water enters the pump chamber, the air existing in the pump chamber passes through an air introduction hole (through hole 5) and is extruded into the second chamber 7 (refer to the arrow A). In addition, in Fig. 2, reference numeral BS denotes an interface between water and air.

In the state shown in FIG. 2, when the drainage pump 1 is stopped, the water filled in the drain hose flows into the pump chamber from the discharge port 4 as return water. A part of the return water flowing into the pump chamber is discharged from the suction port 3, and another part of the return water flows out into the second chamber 7 through an air introduction hole (through hole 5). The drainage pump 1 in the embodiment has a feature in that it reduces the amount of water flowing out into the second chamber 7. Details will be described later.

In order to reduce the amount of water flowing out into the second chamber 7, it is conceivable to reduce the hole diameter of the air introduction hole (through hole 5). However, when the hole diameter of the air introduction hole is made small, the function of the air introduction hole, that is, the function of passing air between the first chamber 6 and the second chamber 7 is deteriorated. When the hole diameter of the air introduction hole is made small, there is a possibility that a water film is formed between the inner wall surface defining the air introduction hole and the outer wall surface of the shaft 9. When a water film is formed, the air introduction hole (through hole 5) does not function. As a result, there is a fear that the output of the drainage pump 1 will not increase.

From the above point of view, in the drainage pump according to the embodiment, while maintaining the hole diameter of the air introduction hole (through hole 5) (that is, without reducing the hole diameter), it flows into the second chamber 7 Reduce the amount of water produced. More specifically, by providing a water flow guiding surface in the vicinity of the air introduction hole (through hole 5), the amount of water flowing out into the second chamber 7 is reduced.

(First embodiment)

With reference to FIG. 3, the drainage pump 1 in the first embodiment will be described. 3 is a partial notched side view schematically showing the drainage pump 1 in the first embodiment.

The drainage pump 1 in the first embodiment includes a pump body MB having a first chamber 6 which is a pump chamber, and a motor having a second chamber 7 disposed above the first chamber 6. The support member 11, the motor 11a, the partition 10 partitioning the first chamber 6 and the second chamber 7, the through hole 5, the shaft 9, and the rotary blade It has (80).

In the first chamber 6, the rotary blade 80 is accommodated. The second chamber 7 is disposed above the first chamber 6. The second chamber 7 can discharge a fluid such as air or water flowing out of the first chamber 6 to the outside of the second chamber. That is, the second chamber 7 is provided with a fluid discharge unit for discharging the fluid in the second chamber to the outside. The fluid discharge part is, for example, a slit 72 provided on the wall of the second chamber 7.

The partition wall 10 is disposed between the first chamber 6 and the second chamber 7 and divides them vertically. Further, in the central portion of the partition wall 10, a through hole 5 is provided so that the first chamber 6 and the second chamber 7 communicate with each other.

The shaft 9 is disposed so as to pass through the through hole 5 and is connected to the rotary blade 80. The shaft 9 functions as a power transmission member that transmits the rotational force from the motor 11a to the rotary blade 80.

The partition wall 10 includes a ring-shaped body portion 101 connected to the side wall 12 and a water flow guiding surface 104 provided on a lower surface of the inner portion of the ring-shaped body portion 101. Further, the side wall 12 includes a side wall 121 of the first chamber and a side wall 122 of the second chamber.

The water flow guiding surface 104 is recessed above the bottom surface 102 of the outer portion of the ring-shaped main body 101 (that is, the ceiling surface of the pump chamber), and the concave portion space ( SP) is defined. The water flow guiding surface 104 guides the water flow flowing into the concave space SP in the horizontal direction or in an oblique downward direction (refer to the arrow B). More specifically, when the direction perpendicular to the central axis of the shaft 9 and the direction from the side wall 12 to the shaft 9 is defined as an in-diameter direction, the water flow guiding surface 104 is concave The water flow introduced into the sub-space SP is guided toward a direction in a diameter direction, or a direction in which the in-diameter direction is combined with a downward direction.

A part of the return water generated by stopping the drainage pump 1 rises toward the through hole 5 along the central axis direction of the shaft 9 (refer to the arrow C). A part of the water flow according to the arrow C interferes with the water flow according to the arrow B, and thus cannot pass through the through hole 5. In this way, the amount of water outflow into the second chamber 7 positioned above the pump chamber is reduced.

In the drainage pump 1 according to the first embodiment, the amount of water flowing into the second chamber 7 located above the pump chamber can be reduced without reducing the hole diameter of the through hole 5.

(Optional additional configuration examples)

Referring to Figs. 3 and 4, an optional additional configuration that can be employed in the first embodiment will be described. 4 is a cross-sectional view of a portion in the vicinity of the water flow guiding surface 104, in a cross-sectional view including the central axis Z of the shaft 9.

(Optional additional configuration example 1)

Referring to FIG. 4, in Configuration Example 1, the angle α formed between the water flow guiding surface 104 and the vertical axis at the inner edge portion 105 of the water flow guiding surface 104 is greater than 0 degrees. It is large and less than 90 degrees. In addition, the inner edge portion 105 of the water flow guiding surface 104 generally coincides with the innermost edge 106 of the lower surface of the partition wall 10. However, when chamfering or rounding is performed on the innermost edge 106 of the lower surface of the partition 10, the water flow is not guided to the innermost edge 106 of the lower surface of the partition 10. In this case, among the areas where chamfering or rounding has not been performed, the innermost part corresponds to the inner edge 105 of the water flow guiding surface 104 (that is, the area where chamfering or rounding has not been performed. And, the boundary between the region in which chamfering or rounding has been performed corresponds to the inner edge portion 105).

When the above-described angle α is greater than 0 degrees and less than 90 degrees, the water flow flowing into the concave space SP is obliquely downward (refer to the arrow B). When a water flow directed downwardly inclined and a water flow directed upward shown by the arrow C collide, the momentum of the water flow directed upward decreases. In this way, the amount of water outflow into the second chamber 7 located above the pump chamber can be reduced.

When the above-described angle α is 90 degrees, the water flow guided into the concave space SP faces inward in the horizontal direction. When the horizontal direction inward water flow and the upward direction water flow shown by the arrow C collide, both water flows are mixed and disturbed in the narrow area SP2 inside the concave space SP. The mixed and disturbed water currents function as a wall against the upward flow. In this way, the amount of water outflow into the second chamber 7 located above the pump chamber can be reduced.

In addition, from the viewpoint of reducing the momentum of the upwardly directed water flow, the angle α is preferably smaller. On the other hand, when the angle α is 0 degrees, the water flow directed downward from the inner edge portion 105 and the water flow directed upward become parallel to each other. For this reason, the water flow discharged from the internal edge 105 and the water flow directed upward do not collide. That is, from the viewpoint of colliding the water flow discharged from the internal edge 105 with the water flow directed upward, the angle α is preferably larger. From the above viewpoint, the optimum angle of the angle α is 1 degree or more and 90 degrees or less, more preferably 5 degrees or more and 80 degrees or less, and even more preferably 10 degrees or more and 40 degrees or less.

In the example (sectional view) shown in Fig. 4, the depth of the concave space SP (more specifically, the point P1 defining the outer margin of the concave space SP, and the water flow guide surface) When the distance in the direction along the vertical direction between the points P3 located at the top of 104 is defined as the depth D1, and the width of the concave space SP is defined as the width W1, the depth ( D1) is, for example, 0.1 times or more and 2 times or less of the width W1, more preferably 0.1 times or more and 1.5 times or less of the width W1. When the depth D1 is deep, the amount of protrusion in the second chamber 7 of the wall portion (the inner portion 103 of the ring-shaped body portion 101+) defining the water flow guiding surface 104 increases. When the amount of protrusion of the inner portion 103 into the second chamber 7 increases, the distance from the fluid outlet of the through hole 5 to the bearing portion 14 or the like to be described later becomes short. As a result, the risk that the water bearing portion 14 and the like come into contact with water increases. Further, if the depth D1 is deep, there is a fear that the water flow on the lower surface 102 of the outer portion of the ring-shaped main body 101 cannot be smoothly guided into the recessed space SP. From the above viewpoint, the depth D1 is preferably 2 times or less or 1.5 times or less of the width W1. The depth D1 may be 1 times or less of the width W1.

In addition, the concave space SP has a surface extending vertically downward from the inner edge portion 105, a surface obtained by extending the lower surface 102 of the outer portion of the ring-shaped body portion 101 in the radial direction, It is defined as a space surrounded by the water flow guiding surface 104. In addition, the width W1 is in the horizontal direction between the point P1 defining the outer edge of the concave space SP and the point P2 defining the inner edge 105 of the water flow guiding surface 104 It is defined as the distance in the direction along the line.

(Experiment result)

With reference to Figs. 5 and 6, the experimental results will be described. 5 is a diagram schematically showing the results of an experiment performed using the drainage pump 1 in the first embodiment. 6 is a diagram schematically showing the results of an experiment performed using a drainage pump in a comparative example (a conventional example in which a water flow inducing surface was not provided).

In the experiment, the jet height (the jet height into the second chamber) of the return water after the drainage pump was stopped was measured. In the experiment conducted using the drainage pump 1 in the first embodiment (see FIG. 5 ), the outer diameter of the shaft 9 inside the through hole 5 is 6 mm, and the inner diameter of the through hole 5 Was 10 mm, and the above-described angle α was 38 degrees. In the experiment performed using the drainage pump 1 in the first embodiment, the jet height H1 of the return water was 20 mm.

In the experiment performed using the drainage pump in the comparative example (refer to FIG. 6 ), the outer diameter of the shaft 9 inside the through hole 5 was 6 mm, and the inner diameter of the through hole 5 was 10 mm. In the experiment conducted using the drainage pump in the comparative example, the jet height H2 of the return water was 32 mm.

From the experimental results, it was confirmed that in the drainage pump according to the first embodiment, the jet height of the return water was reduced by about 38% as compared with the drainage pump in the comparative example. Therefore, it can be said that in the drainage pump according to the first embodiment, the amount of water outflow into the second chamber 7 positioned above the pump chamber can be effectively reduced.

In the drainage pump 1 in the first embodiment, the amount of water outflow into the second chamber 7 can be effectively reduced. For this reason, even if the height H3 of the second chamber 7 shown in FIG. 3 is lowered, the return water does not scatter enough to adhere to the motor 11a, the shaft receiving portion 14, or the like. Accordingly, corrosion of the motor 11a, the bearing 14, and the like is suppressed. In addition, in the first embodiment, since the height H3 of the second chamber 7 can be made low, the drain pump 1 can be downsized.

In addition, when the amount of water outflow into the second chamber 7 is small, the fluid discharge portion such as the slit 72 that also functions as a drain portion can be made small. When the fluid discharge portion (slit 72 or the like) is small, the air propagation sound in the second chamber 7 can be effectively shielded when the drain pump 1 is operated. That is, noise during operation of the drainage pump 1 is reduced.

(Optional additional configuration example 2)

Referring to FIG. 4, in Configuration Example 2, the water flow guiding surface 104 includes a water flow direction changing portion 107 that changes the water flow direction. More specifically, the water flow direction change unit 107 changes the water flow direction from a direction diagonally upward to a direction diagonally downward. The water flow direction changing part 107 is located above the inner edge part 105.

The water flow introduced into the concave space SP firstly advances toward the water flow direction changing portion 107 (refer to the arrow D). That is, the water flow introduced into the concave space SP proceeds upward and inward (direction toward the shaft 9). Subsequently, the water flow introduced into the concave space SP changes the direction in the water flow direction changing portion 107. After that, the water flow whose direction has been changed by the water flow direction changing unit 107 proceeds obliquely downward (refer to the arrow B). That is, the water flow whose direction has been changed by the water flow direction change unit 107 proceeds downward and inward (direction toward the shaft 9). As described above, in the case where the water flow direction changing portion 107 is provided, the water flow diagonally downward is reliably formed.

In addition, the water flow direction changing portion 107 may be a portion located at the uppermost part of the water flow guiding surface 104. That is, the water flow guiding surface 104 is the outer surface 107a that gradually deepens (in other words, gradually goes upward) as it faces the inner diameter direction, and gradually becomes shallower as it faces the inner diameter direction (in other words, , It has an inner surface (107b) gradually facing downward. In addition, the water flow direction changing portion 107 is located between the outer surface 107a and the inner surface 107b.

It is preferable that the outer surface 107a is a surface whose inclination changes as it goes toward the inner diameter direction. From the viewpoint of not separating the water stream from the wall surface, it is preferable that the inclination of the outer surface 107a changes smoothly as it goes toward the inner diameter direction. In other words, it is preferable that the inclination of the outer surface 107a changes stepwise or continuously as it goes toward the inner diameter direction.

The inner surface 107b may be a surface in which the inclination changes toward the inner diameter direction, or may be a surface in which the inclination does not change. The water flow on the inner surface 107b is a water flow directed diagonally downward. For this reason, on the inner surface 107b, irrespective of whether or not the water flow is peeled, the water flow is surely directed obliquely downward.

(Optional additional configuration example 3)

As shown in FIG. 4, in the configuration example 3, the water flow guiding surface 104 has a convex curved surface 108. The convex curved surface 108 is a curved surface convex toward the concave space SP.

It is assumed that the portion on which the convex curved surface 108 is disposed is a portion of the water flow guiding surface 104 connected to the lower surface 102. In this case, it becomes possible to appropriately guide the water flow (refer to the arrow E) on the lower surface 102 of the outer portion of the ring-shaped body portion 101 into the concave space SP without peeling off the wall surface. . In addition, in FIG. 4 (cross-sectional view), the tangent line of the lower surface 102 of the outer portion at the point P1 that defines the marginal margin of the concave space SP, and the marginal margin of the concave area SP. It is preferable that the tangent lines of the water flow guiding surface 104 (more specifically, the convex curved surface 108) at the point P1 coincide with each other. In this case, it becomes possible to appropriately guide the water flow (refer to the arrow E) on the lower surface 102 of the outer portion into the concave space SP without peeling off the wall surface.

In the example shown in FIG. 4, the water flow guiding surface 104 has a concave curved surface 109. And the concave curved surface 109 is located in the radial direction (in other words, the direction closer to the shaft 9) than the convex curved surface 108. When the water flow guiding surface 104 has a concave curved surface 109, it is possible to gradually change the direction of the water flow guided into the concave space SP, and finally, make the water flow an obliquely downward water flow. It becomes.

In the example shown in FIG. 4, the outer surface 107a of the water flow guiding surface 104 includes a convex curved surface 108 and a concave curved surface 109. In addition, an inflection point 108a exists between the convex curved surface 108 and the concave curved surface 109. The inflection point 108a is, for example, located between a point P3 located at the top of the water flow guiding surface 104 (for example, the water flow direction changing portion 107) and the lower surface 102 of the outer portion. do.

Further, the inner surface 107b may be only a concave curved surface, a convex curved surface may be sufficient, a surface having a constant inclination angle may be sufficient, or a combination of these surfaces may be used.

(Optional additional configuration example 4)

Referring to FIG. 3, in the configuration example 4, a receiving plate 15 is disposed in the second chamber 7 to suppress the return water from rising. In the example shown in FIG. 3, the receiving plate 15 is connected to the shaft 9. In the case where the receiving plate 15 is disposed in the second chamber 7, the risk that the return water reaches the bearing unit 14 or the like is reduced.

The above-described structural examples 1 to 4 may be combined with each other to be used. That is, in the first embodiment, configuration examples 1 and 2, configuration examples 1 and 3, configuration examples 1 and 4, configuration examples 2 and 3, configuration examples 2 and 4, configuration examples 3 and 4, configuration examples 1 and 2 And 3, configuration examples 1, 2 and 4, configuration examples 1, 3 and 4, configuration examples 2, 3 and 4, and configuration examples 1 to 4 may be employed.

(Specific example of overall configuration of drainage pump)

With reference to FIG. 7, a specific example of the overall configuration of the drainage pump 1 in the first embodiment will be described. 7 is a partial notched side view schematically showing an example of the overall configuration of the drainage pump 1 in the first embodiment.

The drainage pump 1 includes a pump body MB having a first chamber 6 which is a pump chamber, a motor supporting member 11 having a second chamber 7 disposed above the first chamber 6, It comprises a motor 11a, a partition wall 10 that divides the first chamber 6 and the second chamber 7, a through hole 5, a shaft 9, and a rotating blade member 8 . The shaft 9 includes an upper shaft (output shaft of the motor) 92 and a lower shaft (a hollow shaft portion provided integrally with the rotary blade member 8 and into which the upper shaft 92 is inserted) 82. Further, the rotary blade member 8 includes a large-diameter blade 80a, a small-diameter blade 80b, a ring-shaped dish member 81, and a lower shaft 82.

The drainage pump 1 has a lower housing 6a (pump housing) defining a first chamber (pump chamber 6), and in the first chamber 6, rotary blades 80a, 80b are arranged. do. A suction pipe 3a defining the suction port 3 is disposed below the first chamber 6, and a discharge pipe 4a defining the discharge port 4 is disposed outside the first chamber 6 in the horizontal direction. It is placed. In the example shown in Fig. 7, the lower housing 6a defining the first chamber 6 is integrally molded with a resin material together with the suction pipe 3a and the discharge pipe 4a, but the lower housing 6a and , The suction pipe 3a and the discharge pipe 4a may be prepared as separate bodies, respectively, and these may be bonded to each other. The lower housing 6a is connected to the upper housing 7a through a seal member 13 such as an O-ring.

When the drainage pump 1 is operated, the inside of the pump chamber (the first chamber 6) becomes negative pressure due to the rotation of the rotary blades 80a and 80b, and water is sucked into the pump chamber from the suction port 3 do. The sucked water rotates in the first chamber 6 by rotation of the rotary blade 80a. The water to which the centrifugal force is applied by rotation is discharged toward the discharge pipe 4a, and rises in the drain hose connected to the discharge pipe 4a. In addition, water sucked up from the inlet 3 is, for example, drain water accumulated in a drain pan such as an air conditioner.

In the example shown in FIG. 7, the large-diameter blade 80a is provided so as to be exposed upward from the plate member 81 in a side view. In addition, the lower end of the large-diameter blade 80a is connected to the upper surface of the dish member 81. A step portion 800a is provided from the upper surface to the outer surface of the large-diameter blade 80a, and the sound generated during rotation of the large-diameter blade 80a is reduced by the step portion 800a. In the example shown in FIG. 7, a plurality of large-diameter blades 80a are arranged around the shaft 9 at equal intervals.

A part of the small-diameter blade 80b is disposed inside the suction pipe 3a. Further, the upper surface of the small-diameter blade 80b is connected to the lower surface of the dish member 81. In the example shown in FIG. 7, a plurality of small-diameter blades 80b are disposed around the rotation shaft at equal intervals.

In the example shown in Fig. 7, the large-diameter blade 80a, the small-diameter blade 80b, the dish member 81, and the lower shaft 82 are integrally molded from a resin material, so that the rotary blade member 8 is Is formed. In Fig. 8, an example of the formed rotary blade member 8 is shown.

In FIG. 7, the drain pump 1 includes an upper housing 7a defining the second chamber 7, and a part of the shaft 9 is disposed in the second chamber 7. The upper housing 7a includes a side wall 122 and a partition wall 10. On the lower surface of the partition wall 10, the above-described water flow guide surface 104 is formed. Further, on the side wall 122 of the upper housing 7a, a fluid discharge portion (slit 72) capable of discharging water that has entered the interior of the second chamber 7 is formed.

When the drainage pump 1 stops, the return water enters into the second chamber 7 through the through hole 5. In the example shown in FIG. 7, since the above-described water flow guiding surface 104 is formed on the lower surface of the inner portion of the partition wall 10, the amount of return water flowing into the second chamber 7 is reduced. Further, even when the return water flows into the second chamber 7, the return water is quickly discharged to the outside of the second chamber 7 through the above-described fluid discharge portion (slit 72). For this reason, the possibility that the water bearing portion 14 or the like in the second chamber 7 comes into contact with water is reduced, and the risk of corrosion of the bearing portion 14 or the like is reduced.

In the second chamber 7, a water-receiving plate 15 for suppressing the spout of return water may be disposed. In the example shown in FIG. 7, the receiving plate 15 has a disk shape and is connected to the shaft 9. In the case where the receiving plate 15 is disposed in the second chamber 7, the risk that the return water reaches the bearing unit 14 or the like is reduced. For this reason, the possibility that the water storage unit 14 or the like in the second chamber 7 comes into contact with water is reduced, and the risk of corrosion of the water storage unit 14 or the like is further reduced.

In the upper shaft 92 and the lower shaft 82 constituting the shaft 9, the small-diameter upper shaft 92 is inserted into the shaft hole 83 (see Fig. 8) of the large-diameter lower shaft 82 Connected by being. The receiving plate 15 is disposed between the upper shaft 92 and the lower shaft 82.

In the example shown in FIG. 7, the shaft 9 is supported by the shaft receiving portions 14a and 14b. In the embodiment, since outflow of the return water to the motor side is suppressed, at least a part of the bearing portions 14a and 14b may be formed of a metal material that is liable to be corroded by contact with water.

In the example shown in FIG. 7, the water flow guide surface 104, the fluid discharge part (slit 72), and the water-receiving plate 15 are synergistically in contact with water to the receiving part 14, etc. It is epoch-making in that it suppresses corrosion and suppresses corrosion of the bearing 14 and the like. The water flow guiding surface 104 has a function of suppressing the outflow of the return water into the second chamber 7, and the fluid discharge section (slit 72) quickly reduces the return water in the second chamber 7. It has a function of discharging, and the water-receiving plate 15 has a function of suppressing the splashing of the return water in the second chamber 7. That is, in the example shown in FIG. 7, three configurations having three different functions are combined to effectively suppress the contact of water to the bearing portion 14, etc., and suppress corrosion of the bearing portion 14, etc. Is groundbreaking in

(The first modification of the water flow induction surface)

Referring to Fig. 9, a first modification example of the water flow induction surface is explained. 9 is a cross-sectional view of a portion in the vicinity of the water flow guiding surface 104a in the first modification example, in a cross-sectional view including the central axis Z of the shaft 9. The water flow guiding surface 104a in the first modified example has a cross section of a plurality of straight lines, that is, the water flow guiding surface 104a is a plurality of inclined surfaces that are side surfaces of a plurality of types of truss (圓錐臺). 104a-1 to 104a-6) differs from the water flow guide surface 104 (the water flow guide surface formed so that the cross section is curved) in the example shown in FIG. 4. In other respects, the water flow guide surface 104a in the first modification example is the same as the water flow guide surface 104 in the example shown in FIG. 4.

The water flow guide surface 104a in the example shown in Fig. 9 approximates the water flow guide surface 104 in the example shown in Fig. 4 by a plurality of inclined surfaces. Accordingly, in the description of the first embodiment described above and the description of the configuration examples 1 to 4, the convex curved surface 108 is referred to as “a plurality of inclined surfaces approximately representing the convex curved surface”, and the concave curved surface 109 is referred to as “ A plurality of inclined surfaces approximately representing a concave curved surface" is read, and in the first modification, all of the description of the first embodiment described above and the description of the configuration examples 1 to 4 are adopted. In addition, with respect to the first modification, the description that repeats the above description is omitted.

In addition, in the example shown in FIG. 9, the inclination of the water flow guiding surface 104a changes step by step as it goes toward the inner diameter direction. The inclination of the water flow guiding surface 104a with respect to the horizontal plane increases stepwise from the point P1 defining the outer edge of the concave space SP toward the inner diameter direction. In addition, as it goes beyond the substantial inflection point 108a and goes further toward the inner diameter, the inclination of the water flow guiding surface 104a with respect to the horizontal plane decreases step by step. In addition, the inclination of the water flow guiding surface 104a from the inside of the water flow direction changing portion 107 with respect to the horizontal plane and the slope of the water flow guiding surface 104a from the outside of the water flow direction changing portion 107 with respect to the horizontal plane are, They are slopes opposite to each other.

The water flow guiding surface 104a in the first modified example has the same effect as that achieved by the water flow guiding surface 104 described above.

(2nd Modification Example of Water Flow Guide Surface)

Referring to Fig. 10, a second modification example of the water flow guiding surface will be described. 10 is a cross-sectional view of a portion in the vicinity of the water flow guiding surface 104b in the second modification example, in a cross-sectional view including the central axis Z of the shaft 9. The example shown in FIG. 10 differs from the example shown in FIG. 4 in that an outward tapered surface 5a that expands downwardly is provided on the inner wall surface defining the through hole 5. In other respects, the example described in FIG. 10 is the same as the example described in FIG. 4.

The tapered surface 5a facing outward is a surface that does not contribute to the formation of a water flow toward the shaft 9, similarly to the surface on which the above-described chamfering has been performed. Accordingly, in the example shown in FIG. 10, the inner edge portion 105 of the water flow guiding surface 104b is an inner edge portion of the lower surface of the partition wall 10 excluding the outwardly tapered face 5a. That is, in the example shown in Fig. 10, the water flow guiding surface 104b is a region between the point P1 defining the outer edge of the concave space SP and the position P4 (internal edge 105). .

In the second modification, all of the description of the first embodiment described above and the description of the configuration examples 1 to 4 are employed. In addition, with respect to the second modification, a description that repeats the above description will be omitted.

The water flow guiding surface 104b in the second modified example has the same effect as that achieved by the water flow guiding surface 104 described above.

(3rd modification example of water flow induction surface)

Referring to Fig. 11, a third modification example of the water flow guiding surface will be described. 11 is a cross-sectional view of a portion in the vicinity of the water flow guiding surface 104c in the third modification example, in a cross-sectional view including the central axis Z of the shaft 9. The example shown in Fig. 11 differs from the example shown in Fig. 4 in that a horizontal surface 17 is provided between the inner wall surface defining the through hole 5 and the water flow guide surface 104c.

In the example shown in Fig. 11, the water flow on the water flow guiding surface 104c is peeled off from the wall surface at the position indicated by P5. Accordingly, the horizontal surface 17 is a surface that does not contribute to the formation of a water flow toward the shaft 9, similar to the surface on which the above-described chamfering has been performed. For this reason, in the example shown in FIG. 11, the inner edge portion 105 of the water flow guiding surface 104c is an inner edge portion of the lower surface of the partition wall 10 excluding the horizontal face 17. That is, in the example shown in Fig. 11, the water flow guiding surface 104c is a region between the point P1 defining the outer edge of the concave space SP and the position P5 (internal edge 105). .

In the third modification, all of the description of the first embodiment described above and the description of the configuration examples 1 to 4 are adopted. In addition, with respect to the third modification, the description that repeats the above description is omitted.

The water flow guide surface 104c in the third modified example has the same effect as that of the water flow guide surface 104 described above.

(4th Modification Example of Water Flow Guide Surface)

Referring to Fig. 12, a description will be given of a fourth modification example of the water flow guiding surface. 12 is a cross-sectional view of a portion in the vicinity of the water flow guiding surface 104d in the fourth modification example, in a cross-sectional view including the central axis Z of the shaft 9.

The water flow guiding surface 104d in the fourth modified example has a first surface 1041 that extends along the vertical direction and a second surface 1042 that is recessed above the inner edge portion 105. It is different from the water flow guiding surface 104 described in 4.

In the fourth modification, the slope of the water flow guiding surface 104d at the point P1 defining the marginal margin of the concave space SP and the point P1 defining the marginal margin of the concave area SP The inclination of the lower surface 102 of the outer portion of the ring-shaped body portion 101 is significantly different (90 degrees is different). For this reason, the water flow flowing on the lower surface 102 of the outer portion of the ring-shaped main body 101 is easily peeled off from the wall surface at the point P1. Therefore, from the viewpoint of guiding the water flow into the concave space SP, the water flow guiding surface 104d in the fourth modification cannot be said to have an optimal shape. However, since the water flow guiding surface 104d in the fourth modification has the second surface 1042 recessed above the inner edge portion 105, it is possible to discharge the water flow in an obliquely downward direction. Therefore, by the presence of the water flow guiding surface 104d in the fourth modification, it is possible to reduce the amount of water outflow into the chamber positioned above the pump chamber. Further, as shown in FIG. 12, the second surface 1042 may include a concave curved surface.

In the fourth modification, all of the description of the first embodiment described above and of the configuration examples 1, 2, and 4 are adopted. In addition, with respect to the fourth modified example, a description that repeats the above description is omitted.

(The fifth modification of the water flow induction surface)

Referring to Fig. 13, a fifth modification example of the water flow guiding surface will be described. 13 is a cross-sectional view of a portion in the vicinity of the water flow guiding surface 104e in the fifth modification example, in a cross-sectional view including the central axis Z of the shaft 9.

The water flow guiding surface 104e in the fifth modification example has a first surface 1041 extending along the vertical direction and a second surface 1043 extending along the horizontal direction from the inner edge 105, It is different from the water flow guiding surface 104 described in FIG. 4.

In the fifth modification, the slope of the water flow guiding surface 104e at the point P1 that defines the marginal margin of the concave space SP, and the point P1 defines the marginal margin of the concave area SP. The inclination of the lower surface 102 of the outer portion of the ring-shaped body portion 101 is significantly different (90 degrees is different). For this reason, the water flow flowing on the lower surface 102 of the outer portion of the ring-shaped main body 101 is easily peeled off from the wall surface at the point P1. Therefore, from the viewpoint of guiding the water flow into the recessed space SP, the water flow guiding surface 104e in the fifth modification cannot be said to have an optimal shape. However, since the water flow guiding surface 104e in the fifth modification has the second surface 1043 extending in the horizontal direction from the inner edge portion 105, it is possible to discharge water flow in the horizontal direction. Therefore, by the presence of the water flow guiding surface 104e in the fifth modification, it is possible to reduce the amount of water flowing into the chamber positioned above the pump chamber.

In the fifth modification, all of the description of the first embodiment described above and of the configuration examples 1 and 4 are adopted. In addition, with respect to the fifth modification, the description that repeats the above description is omitted.

In addition, the present invention is not limited to the above-described embodiment. Within the scope of the present invention, the above-described embodiment, each configuration example, free combination of each modification example, or embodiment, each configuration example, modification of arbitrary constituent elements of each modification example, or embodiment, each It is possible to omit arbitrary elements in the configuration examples and each modification example.

For example, in the above-described embodiment, each configuration example, and each modification example, it is assumed that the water flow guiding surface has a shape of rotational symmetry with respect to the central axis Z. In other words, it is assumed that the water flow guiding surface has a ring shape as a whole. However, the water flow guiding surface may not have a shape that is rotationally symmetric with respect to the central axis Z. For example, in the above-described embodiment, each configuration example, and each modification, the shape of the water flow guiding surface in one specific vertical section is shown in FIGS. 4, 9, 10, 11, 12, and 13. It is a shape represented by any one, and the shape in the other vertical cross section of the water flow guiding surface may be a shape different from the shape in the said specific one vertical cross section. Specifically, the shape of the water flow guiding surface on the side where the discharge port 4 is disposed and the shape of the water flow guiding surface on the side where the discharge port 4 is not disposed may be different from each other.

In the above-described embodiment, each configuration example, and each modification, it is assumed that the outer portion of the partition wall and the inner portion 103 of the partition wall defining the water flow guiding surface are constituted by one member formed by integral molding. have. In general, the outer portion of the partition wall and the inner portion 103 of the partition wall are separate bodies, and both may be connected to each other. In addition, the second chamber 7 is present above the first chamber (the motor side) and refers to an area in which the rotation shaft of the motor is arranged, and the second chamber 7 is necessarily provided with a hole or a slit. It doesn't have to be a closed space.

1: drain pump
2: drain hose
3: inlet
3a: suction pipe
4: discharge port
4a: discharge pipe
5: through hole
5a: tapered side
6: Room 1
6a: lower housing
7: Room 2
7a: upper housing
8: rotating blade member
9: shaft
10: bulkhead
11: motor support member
11a: motor
12: side wall
13: thread member
14: shaft receiving part
14a: shaft receiving part
14b: shaft receiving part
15: hand plate
17: horizontal plane
72: slit
80: rotating wing
80a: large diameter wing
80b: small diameter wing
81: plate member
82: lower shaft
83: shaft hole
92: upper shaft
101: ring-shaped body part
102: lower surface
103: inner part
104: water flow guide surface
104a: water flow guiding surface
104b: water flow guide surface
104c: water flow guide surface
104d: water flow guide surface
104e: water flow guiding surface
105: internal edge
106: Choi Nae-yeon
107: water flow direction change part
107a: outer surface
107b: inner surface
108: convex surface
108a: inflection point
109: concave curved surface
121: side wall
122: side wall
800a: step
1041: first page
1042: second page
1043: second page
SP: concave space

Claims (8)

With rotating wings,
A pump body having a first chamber in which the rotating blades are accommodated,
A motor support member disposed above the pump body and having a second chamber capable of discharging the fluid flowing out from the first chamber to the outside;
A motor supported by the motor support member,
A partition wall disposed between the first room and the second room,
A through hole provided in the partition wall,
And a shaft disposed through the through hole and transmitting rotational force from the motor to the rotary blade,
The partition wall,
A ring-shaped body part,
It has a water flow guiding surface provided on the lower surface of the inner portion of the ring-shaped body portion,
The water flow guiding surface defines a concave space recessed above the lower surface of the outer portion of the ring-shaped main body,
The water flow-inducing surface has an outer surface that gradually deepens as it faces the inner diameter direction, and an inner surface that gradually becomes shallower as it faces the inner diameter direction,
A water flow direction change part is located between the outer surface and the inner surface,
The water flow guiding surface, the water flow flowing into the concave space, proceeds upward and inward toward the water flow direction changing part, changing the direction at the water flow direction changing part, and changing the direction of the water flow changed in the water flow direction changing part. , Drainage pump, characterized in that guided toward the inside while being downward. The method of claim 1,
When the depth of the concave space is defined as the depth (D1) and the width of the concave space is defined as the width (W1), the depth (D1) is a multiple, characterized in that not more than twice the width (W1) Pump. The method of claim 1,
In the inner edge portion of the water flow guide surface, an angle formed between the water flow guide surface and the vertical axis is greater than 0 degrees and less than 90 degrees. The method of claim 3,
The water flow guiding surface has a water flow direction changing portion between the outer surface and the inner surface to change the water flow direction,
The water flow direction changing portion is a drain pump, characterized in that located above the inner edge portion. The method of claim 4,
The outer surface is a drainage pump, characterized in that the inclination changes toward the inner diameter direction. The method of claim 1,
And the water flow guiding surface has an inflection point between a point positioned at an uppermost portion of the water flow guiding surface and a lower surface of the outer portion of the ring-shaped body portion. The method of claim 1,
The drainage pump, wherein the water flow inducing surface has a convex curved surface on the outer surface. The method of claim 1,
Also provided with a receiving plate supported by the shaft,
The drainage pump, wherein the receiving plate is disposed in the second chamber.

Images