WO2018096859A1

WO2018096859A1 - Drain pump

Info

Publication number: WO2018096859A1
Application number: PCT/JP2017/038236
Authority: WO
Inventors: 真聖杉野; 克司佐藤; 友也加藤
Original assignee: 株式会社不二工機
Priority date: 2016-11-22
Filing date: 2017-10-24
Publication date: 2018-05-31
Also published as: KR102184879B1; JP6761047B2; KR20190072642A; JP6720373B2; JP2020190249A; JPWO2018096859A1; JP7171072B2; CN109983231A; JP2019094905A; CN109983231B

Abstract

[Problem] To provide a drain pump configured so that the accumulation of water in a discharge section can be prevented. [Solution] A drain pump 1 is provided with a housing 10 having: a body section 11 inside which a space into which water flows is provided; and a pipe-like discharge section 13 which is in communication with the space through an opening 11a provided in the body section 11. The front end 13a of the discharge section 13 is disposed at a higher position than the opening 11a of the body section 11, and the bottom section 13t of the inner surface 13s of the discharge section 13 is formed to have a curved surface, the height of which gradually increases as the bottom section 13t extends from the opening 11a side toward the front end 13a side.

Description

Drainage pump

The present invention relates to a drainage pump used in, for example, an indoor unit of an air conditioner.

In the indoor unit of the air conditioner, moisture in the air condenses and adheres to the heat exchanger during cooling operation, and water droplets generated by the adhering moisture drop into a drain pan provided below the heat exchanger. The drain water accumulated in the drain pan is discharged to the outside of the indoor unit by the drain pump. For example, Patent Document 1 discloses an example of a drainage pump.

Figure 8 shows the configuration of such a drainage pump. The drainage pump 101 shown in FIG. 8 has a housing 110 provided with a main body 111, a tubular suction part 112, and a tubular discharge part 183, and a rotating blade 130 is rotatably provided in the housing 110. Yes. The rotary blades 130 are rotated by a motor 140 in a cover 120 attached to the upper part of the housing 110. Then, due to the rotation of the rotary blade 130, the drain water accumulated in the drain pan is sucked from the tip of the suction portion 112, flows into the pump chamber K in the housing 110, flows in the discharge portion 183 of the housing 110, and flows to the outside. Discharged.

Japanese Patent Laid-Open No. 2016-27249

However, as shown in FIG. 8, the drainage pump 101 has a recess 189 formed at the bottom due to the presence of the small-diameter portion 186 and the large-diameter portion 187 having different inner diameters in the horizontal pipe 185 of the discharge portion 183. There was a risk that drain water would accumulate in the recess 189 and cause water stains and the like.

Therefore, an object of the present invention is to provide a drainage pump that can suppress water from being accumulated in the discharge part.

In order to achieve the above object, a drainage pump according to one aspect of the present invention is a drainage pump having a housing in which rotating blades that suck up water by being rotated by a motor are accommodated, and the housing includes the water pump. A main body part in which a space into which the gas flows is provided, and a tubular discharge part that communicates with the space through an opening provided in the main body part, and a tip of the discharge part is at a position higher than the opening. And a bottom portion of the inner surface of the discharge portion is a horizontal portion, an inclined portion whose position gradually increases from the opening side toward the distal end side, and gradually from the opening side toward the distal end side. It is characterized by comprising a curved surface portion whose position is increased and a combination of one portion or a plurality of portions selected from among them.

In the present invention, the bottom of the inner surface of the discharge part is configured by a curved surface portion whose position gradually increases from the opening side toward the tip side, and the inner surface of the discharge part has a pressure receiving surface facing the downstream side. It has the step part which has.

In the present invention, it is preferable that the end face at the tip of the discharge portion is formed in a tapered shape in which the position of the inner peripheral edge is lower than the position of the outer peripheral edge.

According to the present invention, the bottom of the inner surface of the discharge part is discharged from the horizontal part, the inclined part whose position gradually increases from the opening side of the main body part toward the front end side of the discharge part, and the opening part of the main body part. A curved surface portion whose position gradually increases toward the tip side of the portion and a combination of one portion or a plurality of portions selected from the curved portion. Therefore, when comparing any two points on the bottom of the inner surface of the discharge part, the position of the point closer to the opening is the same height or lower than the position of the point closer to the tip side, and the rotating blade stops In addition, the water in the discharge part easily flows from the tip side toward the opening side of the main body part. Thereby, it can suppress that water accumulates in the bottom part of the inner surface of a discharge part.

Further, according to the present invention, the bottom of the inner surface of the discharge part is configured by a curved surface portion whose position gradually increases from the opening side toward the tip side, and the inner surface of the discharge part has a pressure receiving surface facing the downstream side. It has the step which has. In this way, the drainage pump can drain water in the discharge part and in the hose when drain water is sucked up by the rotation of the rotating blades and discharged through the discharge part and the hose connected to the tip of the discharge part. The pressure receiving surface can receive a part of the pressure generated by the gravity toward the bottom due to gravity. Therefore, the pressure which a rotary blade receives from drain water can be decreased, and a discharge head can be improved effectively.

Furthermore, in the present invention, since the end surface of the tip of the discharge portion is formed in a tapered shape whose inner peripheral edge is lower than the outer peripheral position, the water on the end surface flows toward the inner peripheral edge. It can suppress that water accumulates on an end surface.

It is a figure explaining the composition of the drainage pump concerning a 1st embodiment of the present invention. It is a figure explaining the structure of the 1st modification of the drainage pump of FIG. It is a figure explaining the structure of the 2nd modification of the drainage pump of FIG. It is a figure explaining the structure of the 3rd modification of a drainage pump of Drawing 1, and the 4th modification. It is a figure explaining the structure of the 5th modification of the drainage pump of FIG. It is a figure explaining the structure of the drainage pump concerning 2nd Embodiment of this invention. It is a figure explaining the structure of the 1st modification of the drainage pump of FIG. It is a figure which shows the structure of the conventional drainage pump.

(First embodiment of the present invention)
Hereinafter, a drainage pump according to a first embodiment of the present invention will be described with reference to FIG. The drainage pump of this embodiment is for discharging the drain water collected in the drain pan of the indoor unit of an air conditioner to the outside as an example. Of course, the use of this drain pump is not limited to drain water discharge, but can be used for discharging various kinds of liquids and pumping them up. In the present invention, “water” includes water (H ₂ 0) of the original meaning, and liquids such as water mixed with impurities such as dust and liquid chemicals.

FIG. 1 is a diagram illustrating the configuration of a drainage pump according to a first embodiment of the present invention, and is a front view including a partial cross-sectional view.

As shown in FIG. 1, the drainage pump 1 of the present embodiment includes a housing 10, a cover 20, a rotary blade 30, and a motor 40.

The housing 10 integrally includes a substantially conical main body 11, a tubular suction part 12 that extends downward from the tip of the main body 11, and a tubular discharge part 13 that protrudes from the side of the main body 11. Have. In the main body 11, a space into which drain water sucked up from the suction portion 12 flows is formed on the inner side, and the pump chamber K is formed by surrounding the space together with the cover 20. The suction portion 12 has a tip 12 a disposed in a drain pan (not shown), and drain water accumulated in the drain pan is sucked up through the suction portion 12.

The discharge portion 13 is formed so that the central axis of the inner space surrounded by the inner surface 13 s has an arc shape, the distal end 13 a is disposed upward, and the base end 13 b extends through the opening 11 a of the main body 11. It is integrally connected to the side of the main body 11 so as to surround it. The discharge part 13 is communicated with the pump chamber K through the opening 11 a of the main body part 11.

The inner surface 13s of the discharge portion 13 is formed so that the entire bottom portion 13t becomes a curved surface having a circular arc shape (that is, a curved surface portion) whose position gradually increases from the opening 11a of the main body portion 11 toward the tip end 13a of the discharge portion 13. Has been. Further, the bottom portion 13t of the inner surface 13s of the discharge portion 13 is formed in a shape having no recess since it is formed to be a curved surface as a whole.

The end surface 13a1 of the tip 13a of the discharge part 13 is formed in a tapered shape having an annular shape and a lower inner peripheral edge position than an outer peripheral edge position.

The cover 20 is formed in a substantially cylindrical shape, and its lower end is fitted to the upper opening of the main body 11 of the housing 10 and fixed to the housing 10 by a snap-fit mechanism. At the upper end portion of the cover 20, a bracket 22 fixedly attached via a locking portion 21 is provided. The bracket 22 is provided with an attachment portion 23 for attaching the drainage pump 1 to another device.

The rotary blade 30 is rotatably accommodated in the pump chamber K, and includes a blade shaft portion 31 and a plurality of plate-shaped large-diameter blades (not shown) extending radially from the outer peripheral portion of the blade shaft portion 31. And a small-diameter blade portion 33 provided with four flat plate-shaped small-diameter blades that are connected to the lower end of the large-diameter blade portion 32 and inserted into the suction portion 12. ing. The blade shaft portion 31 is inserted through a through hole 20 a formed in the center of the cover 20 and protrudes upward.

The motor 40 is accommodated in the cover 20, and the drive shaft of the motor 40 is inserted into the insertion hole of the blade shaft portion 31 of the rotary blade 30 disposed in the pump chamber K to support the rotary blade 30.

Next, the operation (action) of the drainage pump 1 of this embodiment will be described.

When the rotating blade 30 is rotated by the motor 40, drain water is sucked into the pump chamber K from the tip 12 a of the suction portion 12 and discharged through the discharge portion 13. At this time, the entire bottom portion 13t of the inner surface 13s of the discharge portion 13 is formed in a curved surface whose position gradually increases from the opening 11a of the main body portion 11 toward the tip end 13a of the discharge portion 13, and is formed on the bottom portion 13t. Since there is no recess, when the rotation of the rotary blade 30 stops, the drain water in the discharge part 13 flows down to the pump chamber K from the opening 11a of the main body part 11 through the bottom part 13t by gravity. Further, since the end surface 13a1 of the tip 13a of the discharge unit 13 is formed in a tapered shape whose inner peripheral edge is lower than the outer peripheral position, the drain water on the end surface 13a1 flows down into the discharge unit 13.

As described above, according to the drainage pump 1 of the present embodiment, the curved surface portion where the bottom portion 13t of the inner surface 13s of the discharge portion 13 gradually increases in position from the opening 11a of the main body portion 11 toward the tip end 13a of the discharge portion 13. That is, the bottom portion 13t of the inner surface 13s of the discharge portion 13 is formed in a shape without a recess. Therefore, when comparing two arbitrary points on the bottom portion 13t of the inner surface 13s of the discharge portion 13, the position of the point closer to the opening 11a becomes the same height or lower than the position of the point closer to the tip 13a, and the rotation When the blades 30 are stopped, the drain water in the discharge part 13 is likely to flow from the tip 13a side toward the opening 11a side of the main body part 11. Thereby, it can suppress that water accumulates in the bottom part 13t of the inner surface 13s of the discharge part 13. FIG.

(Modification of the first embodiment of the present invention)
In the above-described embodiment, the inner surface 13s of the discharge unit 13 is a curved surface having an arcuate cross section (that is, a curved surface portion) in which the entire bottom portion 13t gradually increases in position from the opening 11a of the main body 11 toward the tip 13a of the discharge unit 13. However, the present invention is not limited to this. Hereinafter, configurations of the first to fifth modifications of the drainage pump 1 of the first embodiment will be described with reference to FIGS. 2 to 5. 2 to 5, the same reference numerals as those in FIG. 1 represent the same or equivalent parts.

(First modification)
For example, in the drainage pump 1 of the first embodiment described above, as shown in FIG. 2, a drainage pump 1 </ b> A having a configuration in which a discharge unit 53 is provided instead of the discharge unit 13 may be used. The discharge part 53 is formed in a substantially L shape, and is integrally connected to the side part of the main body part 11 so that the distal end 53a is arranged upward and the base end 53b surrounds the opening 11a of the main body part 11. ing. The discharge part 53 communicates with the pump chamber K through the opening 11 a of the main body part 11.

The discharge part 53 has a horizontal pipe 55 whose central axis of the internal space extends obliquely upward, and a joint pipe 58 whose central axis connected to the tip of the horizontal pipe 55 extends upward (directly above the drainage pump). is doing. The inner surface 58s of the joint pipe 58 is formed along the vertical direction. The inner surface 55s of the horizontal tube 55 is formed to be an inclined surface (that is, an inclined portion) whose position gradually increases until the entire bottom portion 55t abuts against the inner surface 58s of the joint tube 58 from the opening 11a of the main body portion 11. Further, the bottom 55t of the inner surface 55s of the horizontal tube 55 is formed in a shape having no recess since it is formed so as to be an inclined surface as a whole. Further, the end surface 53a1 of the tip 53a of the discharge portion 53 is formed in a tapered shape having an annular shape and a position of the inner peripheral edge lower than the position of the outer peripheral edge. In FIG. 2, the joint pipe 58 is formed so that its central axis extends upward, but may be provided so as to extend obliquely upward instead of directly above.

(Second modification)
Alternatively, for example, in the drainage pump 1 of the first embodiment described above, a drainage pump 1B having a configuration in which a discharge unit 63 is provided instead of the discharge unit 13 may be used as shown in FIG. The discharge part 63 is formed in a substantially L-shape with rounded corners, the distal end 63a is arranged upward, and the base end 63b surrounds the opening 11a of the main body part 11 so as to surround the opening 11a. It is integrally connected to the side. The discharge part 63 is communicated with the pump chamber K through the opening 11 a of the main body part 11. In addition, the discharge part 63 is comprised by fixing and attaching the 2nd part 63d formed separately at the front-end | tip of the 1st part 63c integrally formed with the main-body part 11 by adhesion | attachment, welding, etc. FIG.

The discharge part 63 has a horizontal pipe 65 whose central axis extends in the horizontal direction, and a joint pipe 68 that is connected to the distal end of the horizontal pipe 65 and draws an arc near the distal end and faces upward. The inner surface 68s of the joint pipe 68 is formed along the vertical direction. The inner surface 65s of the horizontal tube 65 has a bottom portion 65t, one end of which is connected to the horizontal portion 65t1 connected to the opening 11a of the main body portion 11 and the other end of the horizontal portion 65t1, and the inner surface 68s of the joint pipe 68 from the opening 11a side of the main body portion 11. It is comprised with the curved-surface part 65t2 of a circular arc shape where a position becomes high gradually until it reaches. Further, the bottom 65t of the inner surface 65s of the horizontal tube 65 is formed of a horizontal portion 65t1 and a curved surface portion 65t2, so that it has a shape without a recess. In addition, in FIG. 3, although the front-end | tip of the coupling pipe 68 is comprised so that it may face upwards (directly above), you may be comprised so that it may follow along diagonally upward.

(Third Modification)
Alternatively, for example, in the drainage pump 1 of the first embodiment described above, as shown in FIG. 4A, a drainage pump 1 </ b> C having a configuration in which a discharge unit 73 is provided instead of the discharge unit 13 may be used. The discharge portion 73 is formed in a substantially L shape, and is integrally connected to the side portion of the main body portion 11 so that the distal end 73a is disposed upward and the base end 73b surrounds the opening 11a of the main body portion 11. ing. The discharge part 73 is communicated with the pump chamber K through the opening 11 a of the main body part 11.

The discharge part 73 has a horizontal pipe 75 having a small diameter part 76 and a large diameter part 77 whose central axis extends in the horizontal direction, and a joint pipe 78 connected to the vicinity of the tip 75a of the horizontal pipe 75 and whose central axis extends upward. is doing. An inner surface 78s of the joint pipe 78 is formed along the vertical direction (upward). The horizontal pipe 75 is such that the center axis of the small diameter portion 76 and the center axis of the large diameter portion 77 are shifted in the vertical direction so that the bottom portion 75t of the inner surface 75s becomes a horizontal plane (that is, a horizontal portion), that is, the bottom portion of the small diameter portion 76. And the bottom of the large-diameter portion 77 are arranged so as to be in contact with each other in a straight line (to be inscribed). At the tip 75a of the horizontal tube 75, there is provided a mold punching hole 75b for extracting a mold used at the time of molding. Further, a cap member 79 is provided to close the mold punching hole 75b. The cylindrical part 79a of the cap member 79 is inserted and fitted into the mold punching hole 75b, and the peripheral edge of the disc part 79b provided at the end of the cylindrical part 79a is It is attached to the tip 75a of the horizontal tube 75 by adhesion or welding.

The inner surface 75s of the horizontal pipe 75 is formed so that the entire bottom portion 75t becomes a horizontal plane (that is, a horizontal portion) of the same height until the entire bottom portion 75t comes into contact with the cap member 79 from the opening 11a of the main body portion 11 toward the tip end 73a side. ing. Further, the bottom 75t of the inner surface 75s of the horizontal pipe 75 is formed in a shape having no recess since it is formed so as to be entirely horizontal.

(Fourth modification)
Alternatively, for example, in the drain pump 1C of the third modified example of the first embodiment described above, as shown in FIG. 4B, a drain pump 1D having a configuration in which a cap member 79A is provided instead of the cap member 79. Also good. The cap member 79A is formed so that the end surface 79t of the cylindrical portion 79a becomes an inclined surface (that is, an inclined portion) whose position gradually increases from the opening 11a of the main body portion 11 toward the tip 73a side of the discharge portion 73. . The end surface 79t becomes the bottom portion 75t instead of the horizontal portion 75t1 overlapping the cylindrical portion 79a of the cap member 79A at the bottom portion 75t of the inner surface 75s of the horizontal pipe 75.

Thereby, the inner surface 75s of the horizontal pipe 75 is configured by a horizontal portion 75t2 having one end continuous with the opening 11a of the main body portion 11, and an end surface 79t (inclined portion) of the cap member 79A continuous with the other end of the horizontal portion 75t2. . Further, the bottom 75t of the inner surface 75s of the horizontal pipe 75 is formed of a horizontal portion 75t2 and an end surface 79t, and thus is formed in a shape having no recess.

(5th modification)
Or, for example, in the drainage pump 1 of the above-described embodiment, as shown in FIG. FIGS. 5A and 5B are diagrams illustrating a configuration of a fifth modification of the drainage pump 1 of the first embodiment, wherein FIG. 5A is a front view including a partial cross-sectional view, and FIG. It is a top view of the front-end | tip 83a.

The discharge portion 83 is formed so that the central axis of the inner space 83v surrounded by the inner surface 83s is arcuate, the distal end 83a is arranged upward, and the base end 83b is the opening 11a of the main body portion 11. Is integrally connected to the side of the main body 11. The discharge part 83 is communicated with the pump chamber K through the opening 11 a of the main body part 11. In this example, the discharge part 83 is resin-molded integrally with the main body part 11.

The inner surface 83s of the discharge part 83 is formed such that the entire bottom part 83t becomes a curved surface having a circular arc shape (that is, a curved surface part) whose position gradually increases from the opening 11a of the main body part 11 toward the tip 83a of the discharge part 83. Has been. Further, the bottom 83t of the inner surface 83s of the discharge part 83 is formed in a shape having no recess since it is formed to be entirely curved.

The end surface 83a1 of the tip 83a of the discharge part 83 is formed in a tapered shape that is annular and has a lower inner peripheral edge position than an outer peripheral edge position. The end surface 83a1 may have an annular shape and may have a planar shape in which the position of the outer peripheral edge and the position of the inner peripheral edge are the same height, but at least a portion in which the position of the inner peripheral edge is lower than the position of the outer peripheral edge It is preferable that

Further, the end face 83a1 of the tip 83a of the discharge part 83 has a length L1 from the outer peripheral edge to the inner peripheral edge in the inner part 83a11 near the main body part 11, and from the outer peripheral edge to the inner peripheral edge in the outer part 83a12 far from the main body part 11. Longer than length L2. Further, the length from the outer peripheral edge to the inner peripheral edge of the end face 83a1 is formed so as to gradually become shorter from the inner part 83a11 toward the outer part 83a12.

That is, the drainage pump 1E of the fifth modification is a drainage pump 1E having a housing 10 in which the rotating blades 30 that suck up water by being rotated by the motor 40 are accommodated, and the housing 10 has a space into which water flows. It has a main body part 11 provided on the inner side and a tubular discharge part 83 communicated with the space through an opening 11a provided in the main body part 11, and a tip 83a of the discharge part 83 is positioned higher than the opening 11a. The bottom portion 83t of the inner surface 83s of the discharge portion 83 is configured by a curved portion whose position gradually increases from the opening 11a side toward the tip end 83a side, and an inner portion 83a11 of the end surface 83a1 of the tip end 83a of the discharge portion 83. The length L1 from the outer peripheral edge to the inner peripheral edge of the outer portion 83a12 is longer than the length L2 from the outer peripheral edge to the inner peripheral edge of the outer portion 83a12. It has been. That is, the center of the opening of the inner space 83v (the opening at the end face of the discharge part 83) is eccentric from the center of the contour of the end face shape of the discharge part 83 to the outside (the side away from the pump chamber K).

By doing in this way, when drain water is sucked up by rotation of the rotary blade 30 and discharged through a hose (not shown) connected to the discharge portion 83 and the tip 83a of the discharge portion 83, the drain water in the hose is discharged. By receiving a part of the pressure generated to move downward due to gravity at the end face 83a1, the pressure received by the rotary blade 30 from the drain water can be reduced. The inner portion 83a11 can be widened by making the length L1 from the outer peripheral edge to the inner peripheral edge in the inner portion 83a11 of the end face 83a1 longer than the length L2 from the outer peripheral edge to the inner peripheral edge in the outer portion 83a12. It is possible to secure an area that effectively functions as a pressure-receiving surface that receives the pressure. Therefore, the discharge head can be improved effectively.

The center of the opening of the inner space 83v has been described as being deviated outward from the center of the contour of the end face shape of the discharge portion 83, but the present invention is not limited to this, and the discharge portion 83 is not limited thereto. It may be eccentric from the contour center of the end face shape to the inside (side approaching the pump chamber K), or may be eccentric to the rotational direction side of the rotary blade 30.

That is, the thickness of the end surface 83a1 of the tip 83a of the discharge part 83 only needs to have a different thickness at least in a partial region in the outer peripheral direction.

Further, as long as the thickness of the end face 83a1 of the tip 83a of the discharge part 83 is such that a strength higher than that required by the discharge part 83 is obtained, the thickness of the end face 83a1 is uniform. good.

In the first to fifth modifications, the same effects as the drainage pump 1 of the above-described embodiment are obtained.

(Second embodiment of the present invention)
Hereinafter, a drainage pump according to a second embodiment of the present invention will be described with reference to FIG.

6A and 6B are diagrams for explaining the configuration of the drainage pump according to the second embodiment of the present invention, wherein FIG. 6A is a front view including a partial cross-sectional view, and FIG. 6B is an enlarged cross-section in the vicinity of the discharge portion. (C) is an example of a cross-sectional view taken along line XX in FIG. 6 (a), and (d) is another example of a cross-sectional view taken along line XX in FIG. 6 (a). is there.

The drainage pump 2 of the present embodiment shown in FIG. 6 is the drainage pump 1 of the first embodiment described above, except that the housing 10 has a discharge portion 113 having a stepped portion formed on the inner surface instead of the discharge portion 13. Has the same configuration as the drainage pump 1 of the first embodiment. Therefore, the same code | symbol is attached | subjected about the structure same as the drainage pump 1 of 1st Embodiment, and description is abbreviate | omitted.

The discharge portion 113 is formed so that the inner space surrounded by the inner surface 113 s has a generally arc shape, the distal end 113 a is arranged upward, and the base end 113 b surrounds the opening 11 a of the main body 11. It is integrally connected to the side part of the main body part 11. The discharge part 113 is communicated with the pump chamber K through the opening 11 a of the main body part 11. In this example, the discharge part 113 is resin-molded integrally with the main body part 11.

The inner surface 113s of the discharge portion 113 is formed so that the entire bottom portion 113t is a curved surface having a circular arc shape (that is, a curved surface portion) that gradually increases in position as it goes from the opening 11a of the main body portion 11 toward the tip end 113a of the discharge portion 113. Has been. Further, the bottom 113t of the inner surface 113s of the discharge portion 113 is formed in a shape having no recess since it is formed to be a curved surface as a whole.

The inner surface 113s of the discharge portion 113 has a stepped portion 113u having a pressure receiving surface 113u1 facing the downstream side (the tip 113a side) on the upper surface side (side facing the bottom portion 113t) of the inner surface 113s. In the present invention, the “surface facing the downstream side (pressure receiving surface)” refers to the downstream side (that is, the fluid outflow direction during the operation of the drain pump) in the portion where the inner surface 113s of the discharge portion 113 protrudes in the center direction. Say the side facing. In the example of FIG.6 (b), the surface which faces the downstream side among the surfaces of the step part 113u is said.

In the example shown in FIG. 6B, the surface (pressure receiving surface) facing the downstream side of the step 113u is formed so as to be substantially orthogonal to the downstream side. In other words, the surface facing the downstream side of the stepped portion 113u is set to be orthogonal to the direction in which the discharged water flows backward when the operation of the drain pump is stopped. In addition, the surface facing the downstream side of the stepped portion 113u may be inclined with respect to the downstream side. In short, a surface (pressure-receiving surface) that provides resistance to the reverse flow of the discharge water is provided in the stepped portion 113u. It only has to be done.

In the present embodiment, the step 113u is provided near the tip 113a, and the pressure receiving surface 113u1 is formed in a direction toward the center of the arc of the bottom 113t. Since the discharge part 113 has the step part 113u, it is formed so that the inner diameter of the part closer to the tip 113a from the step part 113u is larger than the inner diameter of the part closer to the pump chamber K from the step part 113u.

In this embodiment, the pressure receiving surface 113u1 has a shape in which a circular opening (inner surface 113s) inscribed at the bottom 113t is provided on a circular surface as shown in FIG. 6C. In addition, the pressure receiving surface 113u1 may have a crescent shape as shown in FIG. 6D, and the shape of the pressure receiving surface 113u1 is arbitrary as long as the object of the present invention is not violated.

The end surface 113a1 of the tip 113a of the discharge portion 113 is formed in a tapered shape having an annular shape and a lower inner peripheral edge position than an outer peripheral edge position.

The drainage pump 2 of the present embodiment has the following action in addition to the operation (action) of the drainage pump of the first embodiment described above.

That is, when the drain pump 2 sucks up drain water by the rotation of the rotary blade 30 and discharges it through the discharge part 113 and a hose (not shown) connected to the tip 113a of the discharge part 113, the drain pump 2 Part of the pressure generated when the drain water is directed downward by gravity is received by the pressure receiving surface 113u1.

As described above, according to the drainage pump 2 of the present embodiment, when drain water is discharged, the drain water in the discharge portion 113 and the hose (not shown) connected to the discharge portion 113 is caused to flow downward due to gravity. Since a part is received by the pressure receiving surface 113u1, the pressure that the rotary blade 30 receives from the drain water can be reduced. Therefore, the discharge head can be improved effectively.

(First modification)
For example, in the drainage pump 2 of the second embodiment described above, as shown in FIG. 7, a drainage pump 2A having a configuration in which a discharge unit 123 is provided instead of the discharge unit 113 may be used. 7A and 7B are diagrams illustrating the configuration of the first modification of the drainage pump 2 of the second embodiment, wherein FIG. 7A is a front view including a partial cross-sectional view, and FIG. FIG.

The discharge portion 123 is formed so that the inner space surrounded by the inner surface 123 s has a substantially arc shape, the distal end 123 a is arranged upward, and the base end 123 b surrounds the opening 11 a of the main body 11. It is integrally connected to the side part of the main body part 11. The discharge part 123 is communicated with the pump chamber K through the opening 11 a of the main body part 11.

The inner surface 123s of the discharge portion 123 is formed so that the entire bottom portion 123t is a curved surface having a circular arc shape (that is, a curved surface portion) whose position gradually increases as it goes from the opening 11a of the main body portion 11 toward the tip end 123a of the discharge portion 123. Has been. In addition, the bottom 123t of the inner surface 123s of the discharge part 123 is formed in a shape without a concave portion because it is formed to be a curved surface as a whole.

The inner surface 123s of the discharge portion 123 has a stepped portion 123u having a pressure receiving surface 123u1 facing the downstream side (tip 123a side) on the upper surface side (side facing the bottom portion 123t) of the inner surface 123s. In this embodiment, the step part 123u is provided between the front end 123a and the base end 123b, and the pressure receiving surface 123u1 is formed along the vertical direction. Since the discharge part 123 has the step part 123u, it is formed so that the inner diameter of the part near the tip 123a from the step part 123u is larger than the inner diameter of the part near the pump chamber K from the step part 123u.

The end surface 123a1 of the tip 123a of the discharge part 123 is formed in a tapered shape having an annular shape and a lower inner peripheral edge position than an outer peripheral edge position.

6 and 7, the

step portions

113u and 123u having the pressure receiving surfaces 113u1 and 123u1 are both in the direction of the center of curvature of the

inner surfaces

113s and 123s of the discharge portion (the ceiling side facing the

bottom portions

113t and 123t). Is provided. By providing at such a position, when the

discharge portions

113 and 123 are resin-molded, the

discharge portions

113 and 123 can be simply extracted by pulling out the core (not shown) for forming the

inner surfaces

113s and 123s in the bending direction. As a result, the

discharge portions

113 and 123 and the housing 10 can be integrally molded with resin.

However, if the

discharge portions

113 and 123 and the housing 10 are formed separately and then joined together by adhesion, welding, or the like, the

step portions

113u and 123u having the pressure receiving surfaces 113u1 and 123u1 are both It may be provided in a direction (bottom 113t, 123t side) opposite to the direction of the center of curvature of the

inner surfaces

113s, 123s of the discharge part, or on any other side, that is, any part of the

inner surfaces

113s, 123s of the discharge part.

Also in this first modified example, the same operational effects as the drainage pump 2 of the second embodiment described above are exhibited.

The applicants are the drainage pump 1 of the first embodiment (Example 1), which is a drainage pump whose bottom surface on the inner surface of the discharge part is a curved surface part, and the drainage pump 2 (Example 2) of the second embodiment. The drain pump 2A (Example 3) of the 1st modification was created, and the discharge head was measured about each drain pump. The measurement results of each example are shown below.

Example 1: 1615 mm
Example 2: 1625 mm
Example 3: 1625 mm

From this result, the drainage pump 2 of Example 2 having the pressure receiving surface 113u1 and the drainage pump 2A of Example 3 having the pressure receiving surface 123u1 have a discharge head higher than the drainage pump 1 of Example 1 having no such pressure receiving surface. It can be seen that the pumping capacity is higher. A lift difference of 10 mm corresponds to a pressure of about 100 Pa, and when this pressure is received by the pressure receiving surface 113u1 and the pressure receiving surface 123u1, the pressure received by the rotary blade 30 from the drain water is reduced, and a higher discharge head is obtained. It is assumed that it has been realized.

Thus, the effect of the configuration according to the second embodiment of the present invention was also clarified from the measurement result of the discharge head.

Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. Those in which those skilled in the art appropriately added, deleted, and changed the design of the above-described embodiments, and combinations of the features of the embodiments as appropriate, also include the present invention as long as they include the gist of the present invention. It is included in the scope of the invention.

Further, if the pressure receiving surface provided on the inner surface of the discharge part is a convex part provided on the inner surface of the discharge part or an inclined surface in which the internal flow path of the discharge part is narrowed toward the pump chamber K, the convex part or At least a part of the slope can receive the pressure of drain water generated on the pump chamber K side, thereby reducing the force of the drain water trying to return to the pump chamber K side. That is, the part which receives the pressure of drain water of said convex part and a slope becomes said pressure receiving surface.

Therefore, the pressure receiving surface provided on the inner surface of the discharge part may have any shape and size as long as it is a convex part provided on the inner surface of the discharge part or an inclined surface that narrows as the internal flow path of the discharge part goes to the pump chamber K. May be provided, or may be provided at any location inside the discharge section.

(First embodiment)
DESCRIPTION OF SYMBOLS 1 ... Drain pump, 10 ... Housing, 11 ... Main part, 11a ... Opening, 12 ... Suction part, 12a ... Tip, 13 ... Discharge part, 13a ... Tip, 13a1 ... End face, 13b ... Base end, 13s ... Inner face, 13t DESCRIPTION OF SYMBOLS ... Bottom part, 20 ... Cover, 20a ... Through-hole, 21 ... Locking part, 22 ... Bracket, 23 ... Mounting part, 30 ... Rotary blade, 31 ... Blade shaft part, 32 ... Large diameter blade part, 33 ... Small diameter blade part 40 ... motor, K ... pump room.
(First modification of the first embodiment)
DESCRIPTION OF SYMBOLS 1A ... Drain pump, 53 ... Discharge part, 53a ... Tip, 53a1 ... End face, 53b ... Base end, 55 ... Horizontal pipe, 55s ... Inner face, 55t ... Bottom part, 58 ... Joint pipe, 58s ... Inner face.
(Second modification of the first embodiment)
DESCRIPTION OF SYMBOLS 1B ... Drain pump, 63 ... Discharge part, 63a ... Tip, 63b ... Base end, 63c ... 1st part, 63d ... 2nd part, 65 ... Horizontal pipe, 65s ... Inner surface, 65t ... Bottom part, 65t1 ... Horizontal part, 65t2 ... curved surface portion, 68 ... joint pipe, 68s ... inner surface.
(Third Modification of First Embodiment)
DESCRIPTION OF SYMBOLS 1C ... Drain pump 73 ... Discharge part 73a ... Tip, 73b ... Base end, 75 ... Horizontal pipe, 75a ... Tip, 75b ... Mold punching hole, 75s ... Inner surface, 75t ... Bottom part, 76 ... Small diameter part, 77 ... Large diameter 78, joint pipe, 78s, inner surface, 79, cap member, 79a, cylindrical part, 79b, disc part.
(Fourth modification of the first embodiment)
1D ... Drain pump, 79A ... Cap member, 75t1 ... Horizontal portion overlapping the cylindrical portion of the cap member, 75t2 ... Horizontal portion, 79t ... End face.
(Fifth Modification of First Embodiment)
DESCRIPTION OF SYMBOLS 1E ... Drain pump, 83 ... Discharge part, 83a ... Tip, 83a1 ... End face, 83a11 ... Inner part, 83a12 ... Outer part, 83b ... Base end, 83s ... Inner face, 83t ... Bottom part, 83v ... Inner space, L1 ... Inner part The length from the outer periphery to the inner periphery, L2... The length from the outer periphery to the inner periphery in the outer portion.
(Second Embodiment)
DESCRIPTION OF SYMBOLS 2 ... Drain pump, 113 ... Discharge part, 113a ... Tip, 113a1 ... End surface, 113b ... Base end, 113s ... Inner surface, 113t ... Bottom part, 113u ... Step part, 113u1 ... Pressure receiving surface.
(First Modification of Second Embodiment)
2A ... drainage pump, 123 ... discharge part, 123a ... tip, 123a1 ... end face, 123b ... base end, 123s ... inner face, 123t ... bottom part, 123u ... step part, 123u1 ... pressure receiving surface.

Claims

A drainage pump having a housing in which rotating blades that suck up water by being rotated by a motor are accommodated,
The housing includes a main body portion in which a space into which the water flows is provided, and a tubular discharge portion that is communicated with the space through an opening provided in the main body portion,
The tip of the discharge part is arranged at a position higher than the opening,
The bottom part of the inner surface of the discharge part has a horizontal part, an inclined part whose position gradually increases from the opening side toward the tip side, and a position which gradually increases from the opening side toward the tip side. A drainage pump comprising a curved surface portion and a combination of one portion or a plurality of portions selected from the curved portion.
The bottom part of the inner surface of the discharge part is constituted by a curved surface part whose position gradually increases from the opening side toward the tip side,
The drainage pump according to claim 1, wherein an inner surface of the discharge portion includes a step portion having a pressure receiving surface.
The drainage pump according to claim 1 or 2, wherein the end face of the tip of the discharge part is formed in a tapered shape in which the position of the inner peripheral edge is lower than the position of the outer peripheral edge.