JP6761047B2

JP6761047B2 - Drainage pump

Info

Publication number: JP6761047B2
Application number: JP2018552474A
Authority: JP
Inventors: 真聖杉野; 克司佐藤; 友也加藤
Original assignee: Fujikoki Corp
Current assignee: Fujikoki Corp
Priority date: 2016-11-22
Filing date: 2017-10-24
Publication date: 2020-09-23
Anticipated expiration: 2037-10-24
Also published as: JP2020190249A; CN109983231B; JP2019094905A; JP7171072B2; JP6720373B2; KR102184879B1; CN109983231A; KR20190072642A; JPWO2018096859A1; WO2018096859A1

Description

本発明は、例えば、空気調和機の室内ユニット等で用いられる排水ポンプに関する。 The present invention relates to a drainage pump used in, for example, an indoor unit of an air conditioner.

空気調和機の室内ユニットにおいては、冷房運転時に空気中の水分が凝縮して熱交換器に付着し、付着した水分により生じた水滴が熱交換器の下方に設けられるドレンパン内に滴下する。そして、このドレンパン内に溜まったドレン水が、排水ポンプによって室内ユニット外部に排出される。例えば、特許文献１に排水ポンプの一例が開示されている。 In the indoor unit of the air conditioner, the moisture in the air is condensed and adheres to the heat exchanger during the cooling operation, and the water droplets generated by the adhered moisture are dropped into the drain pan provided below the heat exchanger. Then, the drain water collected in the drain pan is discharged to the outside of the indoor unit by the drainage pump. For example, Patent Document 1 discloses an example of a drainage pump.

このような排水ポンプの構成を図８に示す。図８に示す排水ポンプ１０１は、本体部１１１、管状の吸込部１１２および管状の吐出部１８３が設けられたハウジング１１０を有しており、ハウジング１１０内に回転羽根１３０が回転自在に設けられている。この回転羽根１３０はハウジング１１０の上部に取り付けられたカバー１２０内のモーター１４０により回転される。そして、回転羽根１３０の回転により、ドレンパン内に溜まったドレン水は吸込部１１２の先端から吸い込まれ、ハウジング１１０内のポンプ室Ｋに流れ込んで、ハウジング１１０の吐出部１８３内を流動して外部に排出される。 The configuration of such a drainage pump is shown in FIG. The drainage pump 101 shown in FIG. 8 has a housing 110 provided with a main body 111, a tubular suction portion 112, and a tubular discharge portion 183, and a rotary blade 130 is rotatably provided in the housing 110. There is. The rotary blade 130 is rotated by a motor 140 in a cover 120 mounted on the upper part of the housing 110. Then, due to the rotation of the rotary blade 130, the drain water collected 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. It is discharged.

特開２０１６−２７２４９号公報Japanese Unexamined Patent Publication No. 2016-27249

しかしながら、排水ポンプ１０１は、図８に示すように、吐出部１８３の水平管１８５に内径の異なる小径部１８６および大径部１８７が存在することにより底部に凹部１８９が形成されており、そのため、凹部１８９内にドレン水が溜まって水垢などが生じてしまうおそれがあった。 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 collect in the recess 189 and cause water stains and the like.

そこで、本発明は、吐出部に水が溜まってしまうことを抑制できる排水ポンプを提供することを目的とする。 Therefore, an object of the present invention is to provide a drainage pump capable of suppressing the accumulation of water in the discharge portion.

（１）上記目的を達成するために、本発明の一態様に係る排水ポンプは、モーターで回転されることにより水を吸い上げる回転羽根が収容されるハウジングを有する排水ポンプであって、前記ハウジングが、前記水が流れ込む空間が内側に設けられた本体部と、前記本体部の側部に設けられた開口を通じて前記空間と連通された管状の吐出部とを有し、前記吐出部は、内面で囲われた内側空間の中心軸が円弧状となるように形成され、前記吐出部の先端が、前記開口より高い位置に上方に向けて配置され、前記吐出部の内面における前記開口から前記先端までの前記中心軸の円弧中心から最も離れた部分が、前記開口側から前記先端側に向かうにしたがって徐々に位置が高くなる曲面部分で構成されていることを特徴とする。
（２）上記目的を達成するために、本発明の他の一態様に係る排水ポンプは、モーターで回転されることにより水を吸い上げる回転羽根が収容されるハウジングを有する排水ポンプであって、前記ハウジングが、前記水が流れ込む空間が内側に設けられた本体部と、前記本体部の側部に設けられた開口を通じて前記空間と連通された管状の吐出部とを有し、前記吐出部が、前記本体部に連接された横管と、前記横管に連接された継手管とを有するＬ字状に形成され、前記吐出部の先端が、前記開口より高い位置に上方に向けて配置され、前記吐出部の前記横管の内面の底部全体が、前記開口側から前記先端側に向かうにしたがって直線状に位置が高くなる傾斜部分で構成され、前記傾斜部分の前記先端側に、前記吐出部の前記継手管の内面における鉛直方向に沿うように形成された部分が連なっていることを特徴とする。
（３）他の一態様に係る排水ポンプは、モーターで回転されることにより水を吸い上げる回転羽根が収容されるハウジングを有する排水ポンプであって、前記ハウジングが、前記水が流れ込む空間が内側に設けられた本体部と、前記本体部の側部に設けられた開口を通じて前記空間と連通された管状の吐出部とを有し、前記吐出部が、前記本体部に連接された横管と、前記横管に連結された継手管とを有する、角部が丸みを帯びたＬ字状に形成され、前記吐出部の先端が、前記開口より高い位置に上方に向けて配置され、前記吐出部の前記横管の内面の底部が、一端が前記開口に連なる水平部分で構成され、前記吐出部の前記継手管の内面における前記横管側の端部が、前記水平部分の前記先端側に連なり、前記開口側から前記先端側に向かうにしたがって徐々に位置が高くなる曲面部分を有し、前記曲面部分の前記先端側に、前記吐出部の前記継手管の内面における鉛直方向に沿うように形成された部分が連なっており、前記吐出部の内面が、水が重力により下方に向かおうとして生じる圧力を受ける受圧面を有する段部を有していることを特徴とする。
（４）上記目的を達成するために、本発明の他の一態様に係る排水ポンプは、モーターで回転されることにより水を吸い上げる回転羽根が収容されるハウジングを有する排水ポンプであって、前記ハウジングが、前記水が流れ込む空間が内側に設けられた本体部と、前記本体部の側部に設けられた開口を通じて前記空間と連通された管状の吐出部とを有し、前記吐出部が、前記本体部に連接された水平管と、前記水平管に連接された継手管とを有するＬ字状に形成され、前記吐出部の先端が、前記開口より高い位置に上方に向けて配置され、前記吐出部の前記水平管の内面の底部が、一端が前記開口に連なる水平部分で構成され、前記吐出部の前記水平管の先端には、型抜孔が設けられ、当該型抜き孔はキャップ部材で塞がれており、前記キャップ部材が、前記水平部分の前記吐出部の先端側に連なり、前記開口側から前記吐出部の先端側に向かうにしたがって徐々に位置が高くなる傾斜部分を有し、前記傾斜部分の前記吐出部の先端側に、前記吐出部の前記継手管の内面における鉛直方向に沿うように形成された部分が連なっていることを特徴とする。 (1) In order to achieve the above object, the drainage pump according to one aspect of the present invention is a drainage pump having a housing in which a rotary blade that sucks up water by being rotated by a motor is housed, and the housing is It has a main body portion in which a space through which the water flows flows is provided inside, and a tubular discharge portion communicated with the space through an opening provided in a side portion of the main body portion, and the discharge portion has an inner surface. The central axis of the enclosed inner space is formed so as to have an arc shape, and the tip of the discharge portion is arranged upward at a position higher than the opening, from the opening to the tip on the inner surface of the discharge portion. The portion of the central axis farthest from the arc center is composed of a curved portion whose position gradually increases from the opening side toward the tip side.
(2) In order to achieve the above object, the drainage pump according to another aspect of the present invention is a drainage pump having a housing in which a rotary blade that sucks up water by being rotated by a motor is housed. The housing has a main body portion provided with a space through which the water flows, and a tubular discharge portion communicated with the space through an opening provided on a side portion of the main body portion. It is formed in an L shape having a horizontal pipe connected to the main body and a joint pipe connected to the horizontal pipe, and the tip of the discharge portion is arranged upward at a position higher than the opening. The entire bottom of the inner surface of the horizontal pipe of the discharge portion is composed of an inclined portion whose position increases linearly from the opening side toward the tip side, and the discharge portion is located on the tip side of the inclined portion. It is characterized in that the portions formed along the vertical direction on the inner surface of the joint pipe are connected.
(3 ) The drainage pump according to the other aspect is a drainage pump having a housing in which a rotary blade that sucks up water by being rotated by a motor is housed, and the space in which the water flows is inside the housing. A horizontal pipe having a main body portion provided and a tubular discharge portion communicated with the space through an opening provided on a side portion of the main body portion, and the discharge portion is connected to the main body portion. A joint pipe connected to the horizontal pipe is formed at a rounded L-shape, and the tip of the discharge portion is arranged upward at a position higher than the opening. The bottom of the inner surface of the horizontal pipe is formed of a horizontal portion whose one end is connected to the opening, and the end of the discharge portion on the inner surface of the joint pipe on the horizontal pipe side is connected to the tip side of the horizontal portion. It has a curved surface portion whose position gradually increases from the opening side toward the tip end side, and is formed on the tip end side of the curved surface portion along the vertical direction on the inner surface of the joint pipe of the discharge portion. It is characterized in that the inner surface of the discharge portion has a step portion having a pressure receiving surface that receives a pressure generated when water tends to move downward due to gravity.
(4) In order to achieve the above object, the drainage pump according to another aspect of the present invention is a drainage pump having a housing in which a rotary blade that sucks up horizontal by being rotated by a motor is housed. The housing has a main body portion in which a space through which the horizontal flows flows is provided inside, and a tubular discharge portion communicated with the space through an opening provided in a side portion of the main body portion. It is formed in an L shape having a horizontal pipe connected to the main body and a joint pipe connected to the horizontal pipe, and the tip of the discharge portion is arranged upward at a position higher than the opening. The bottom of the inner surface of the horizontal pipe of the discharge portion is composed of a horizontal portion having one end connected to the opening, and a die-cutting hole is provided at the tip of the horizontal pipe of the discharge portion, and the die-cutting hole is a cap member. The cap member is connected to the tip end side of the discharge portion of the horizontal portion, and has an inclined portion whose position gradually increases from the opening side toward the tip end side of the discharge portion. It is characterized in that a portion formed along the vertical direction on the inner surface of the joint pipe of the discharge portion is connected to the tip end side of the discharge portion of the inclined portion.

本発明において、前記吐出部の内面が、水が重力により下方に向かおうとして生じる圧力を受ける受圧面を有する段部を有していることが好ましい。 In the present invention, the inner surface of the front Symbol discharge portion preferably water has a stepped portion having a pressure receiving surface for receiving a pressure generated as leaps downwards by gravity.

本発明において、前記吐出部の先端の端面が、外周縁の位置よりも内周縁の位置が低いテーパー状に形成されていることが好ましい。 In the present invention, it is preferable that the end surface of 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.

本発明によれば、吐出部の内面の底部が、（１）本体部の開口側から吐出部の先端側に向かうにしたがって徐々に位置が高くなる曲面部分で構成されている、または、（２）本体部の開口側から吐出部の先端側に向かうにしたがって徐々に位置が高くなる傾斜部分で構成されている、または、（３）水平部分と、この水平部分における吐出部の先端側に連なり、本体部の開口側から吐出部の先端側に向かうにしたがって徐々に位置が高くなる曲面部分との組み合わせで構成されている、または、（４）水平部分と、この水平部分における吐出部の先端側に連なり、本体部の開口側から吐出部の先端側に向かうにしたがって徐々に位置が高くなる傾斜部分との組み合わせで構成されている。そのため、吐出部の内面の底部における任意の２点を比較したときに、開口側寄りの点の位置が、先端側寄りの点の位置より同じ高さかまたは低い位置となり、回転羽根が停止した場合に、吐出部内の水が先端側から本体部の開口側に向かって流れやすくなる。これにより、吐出部の内面の底部に水が溜まってしまうことを抑制できる。 According to the present invention, the bottom of the inner surface of the discharge portion is composed of (1) a curved surface portion whose position gradually increases from the opening side of the main body portion toward the tip end side of the discharge portion, or (2). ) It is composed of an inclined part whose position gradually rises from the opening side of the main body toward the tip side of the discharge part, or (3) continuous with the horizontal part and the tip side of the discharge part in this horizontal part. , It is composed of a combination of a curved surface portion whose position gradually rises from the opening side of the main body toward the tip end side of the discharge portion, or (4) a horizontal portion and the tip of the discharge portion in this horizontal portion. It is composed of a combination of an inclined portion that is continuous with the side and gradually increases in position from the opening side of the main body toward the tip side of the discharge portion. Therefore, when comparing arbitrary two points on the bottom of the inner surface of the discharge portion, the position of the point closer to the opening side becomes the same height or lower than the position of the point closer to the tip side, and the rotary blade stops. In addition, the water in the discharge portion easily flows from the tip side toward the opening side of the main body portion. As a result, it is possible to prevent water from accumulating on the bottom of the inner surface of the discharge portion.

また、本発明によれば、吐出部の内面が、下流側を向く受圧面を有する段部を有している。このようにしたことから、排水ポンプは、回転羽根の回転によりドレン水が吸い上げられて吐出部および当該吐出部の先端に接続されたホースを通じて排出される場合に、吐出部内およびホース内のドレン水が重力により下方に向かおうとして生じる圧力の一部を受圧面で受けることができる。そのため、回転羽根がドレン水から受ける圧力を減少させることができ、吐出揚程を効果的に向上させることができる。 Further, according to the present invention, the inner surface of the ejection exit portion has a stepped portion having a pressure receiving surface facing the downstream side. Therefore, in the drainage pump, when the drain water is sucked up by the rotation of the rotary blade and discharged through the discharge part and the hose connected to the tip of the discharge part, the drain water in the discharge part and the hose is discharged. The pressure receiving surface can receive a part of the pressure generated when the hose tries to move downward due to gravity. Therefore, the pressure received by the rotary blades from the drain water can be reduced, and the discharge head can be effectively improved.

さらには、本発明において、吐出部の先端の端面が、外周縁の位置よりも内周縁の位置が低いテーパー状に形成されていることで、端面上の水が内周縁側に流れるので、当該端面上に水が溜まってしまうことを抑制できる。 Further, in the present invention, since the end surface of 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, water on the end surface flows to the inner peripheral edge side. It is possible to prevent water from accumulating on the end face.

本発明の第１実施形態に係る排水ポンプの構成を説明する図である。It is a figure explaining the structure of the drainage pump which concerns on 1st Embodiment of this invention. 図１の排水ポンプの第１変形例の構成を説明する図である。It is a figure explaining the structure of the 1st modification of the drainage pump of FIG. 図１の排水ポンプの第２変形例の構成を説明する図である。It is a figure explaining the structure of the 2nd modification of the drainage pump of FIG. 図１の排水ポンプの第３変形例および第４変形例の構成を説明する図である。It is a figure explaining the structure of the 3rd modification and the 4th modification of the drainage pump of FIG. 図１の排水ポンプの第５変形例の構成を説明する図である。It is a figure explaining the structure of the 5th modification of the drainage pump of FIG. 本発明の第２実施形態にかかる排水ポンプの構成を説明する図である。It is a figure explaining the structure of the drainage pump which concerns on 2nd Embodiment of this invention. 図６の排水ポンプの第１変形例の構成を説明する図である。It is a figure explaining the structure of the 1st modification of the drainage pump of FIG. 従来の排水ポンプの構成を示す図である。It is a figure which shows the structure of the conventional drainage pump.

（本発明の第１実施形態）
以下、本発明の第１実施形態に係る排水ポンプについて図１を参照して説明する。本実施形態の排水ポンプは、一例として、空気調和機の室内ユニットのドレンパン内に溜まったドレン水を外部に排出するためのものである。もちろん、この排水ポンプの用途は、ドレン水の排出に限られず、各種液体の排出や汲み上げなどに用いることができる。本発明において、「水」とは、本来の意味の水（Ｈ_２０）に加えて、塵埃などの不純物が混入した水や液状の薬剤などの液体状のものも含む。(First Embodiment of the present invention)
Hereinafter, the drainage pump according to the first embodiment of the present invention will be described with reference to FIG. As an example, the drainage pump of the present embodiment is for discharging the drain water accumulated in the drain pan of the indoor unit of the air conditioner to the outside. Of course, the use of this drainage pump is not limited to the discharge of drain water, and can be used for the discharge and pumping of various liquids. In the present invention, "water", in addition to water the original meaning (H 2 _0), including those of the water or liquid impurities are mixed in the dust, such as a drug-like liquid.

図１は、本発明の第１実施形態に係る排水ポンプの構成を説明する図であって、一部断面図を含む正面図である。 FIG. 1 is a diagram illustrating a 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.

図１に示すように、本実施形態の排水ポンプ１は、ハウジング１０と、カバー２０と、回転羽根３０と、モーター４０と、を有している。 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.

ハウジング１０は、略円錐状の本体部１１と、本体部１１の先端から下方に延びる管状の吸込部１２と、本体部１１の側部から突出して設けられた管状の吐出部１３とを一体に有している。本体部１１は、吸込部１２から吸い上げられたドレン水が流れ込む空間が内側に形成されており、当該空間をカバー２０とともに囲むことでポンプ室Ｋを形成している。吸込部１２は、その先端１２ａが図示しないドレンパン内に配置され、ドレンパン内に溜まったドレン水が吸込部１２を通じて吸い上げられる。 The housing 10 integrally includes a substantially conical main body portion 11, a tubular suction portion 12 extending downward from the tip of the main body portion 11, and a tubular discharge portion 13 protruding from the side portion of the main body portion 11. Have. In the main body portion 11, a space into which the drain water sucked up from the suction portion 12 flows is formed inside, and the pump chamber K is formed by surrounding the space together with the cover 20. The tip 12a of the suction portion 12a is arranged in a drain pan (not shown), and the drain water accumulated in the drain pan is sucked up through the suction portion 12.

吐出部１３は、内面１３ｓで囲われた内側空間の中心軸が円弧状となるように形成されており、先端１３ａが上方に向けて配置されるとともに基端１３ｂが本体部１１の開口１１ａを囲むようにして本体部１１の側部に一体に連接されている。吐出部１３は、本体部１１の開口１１ａを通じてポンプ室Ｋに連通されている。 The discharge portion 13 is formed so that the central axis of the inner space surrounded by the inner surface 13s is arcuate, the tip 13a is arranged upward, and the base end 13b opens the opening 11a of the main body 11. It is integrally connected to the side portion of the main body portion 11 so as to surround it. The discharge portion 13 is communicated with the pump chamber K through the opening 11a of the main body portion 11.

吐出部１３の内面１３ｓは、底部１３ｔ全体が本体部１１の開口１１ａから吐出部１３の先端１３ａに向かうにしたがって徐々に位置が高くなる断面円弧状の曲面（すなわち曲面部分）となるように形成されている。また、吐出部１３の内面１３ｓの底部１３ｔは、全体が曲面となるように形成されていることから凹部のない形状に形成されている。図１に示す底部１３ｔは、吐出部１３の内面１３ｓにおける開口１１ａから先端１３ａまでの当該内面１３ｓで囲われた内側空間の中心軸の円弧中心から最も離れた部分である。 The inner surface 13s of the discharge portion 13 is formed so that the entire bottom portion 13t becomes a curved surface (that is, a curved surface portion) having an arcuate cross section whose position gradually increases from the opening 11a of the main body 11 toward the tip 13a of the discharge portion 13. Has been done. Further, since the bottom portion 13t of the inner surface 13s of the discharge portion 13 is formed so as to have a curved surface as a whole, it is formed in a shape without recesses. The bottom portion 13t shown in FIG. 1 is a portion of the inner surface 13s of the discharge portion 13 farthest from the arc center of the central axis of the inner space surrounded by the inner surface 13s from the opening 11a to the tip 13a.

吐出部１３の先端１３ａの端面１３ａ１は、円環状でかつ外周縁の位置よりも内周縁の位置が低いテーパー状に形成されている。 The end surface 13a1 of the tip 13a of the discharge portion 13 is formed in an annular shape and has a tapered shape in which the position of the inner peripheral edge is lower than the position of the outer peripheral edge.

カバー２０は、略円筒形状に形成されており、その下端部がハウジング１０の本体部１１の上部開口と嵌合されて、スナップフィット機構によりハウジング１０に固定して取り付けられる。カバー２０の上端部には、係止部２１を介して固定して取り付けられたブラケット２２が設けられている。ブラケット２２には、排水ポンプ１を他の機器に取り付けるための取付部２３が設けられている。 The cover 20 is formed in a substantially cylindrical shape, the lower end portion thereof is fitted with the upper opening of the main body portion 11 of the housing 10, and the cover 20 is fixedly attached to the housing 10 by a snap-fit mechanism. A bracket 22 fixedly attached to the upper end of the cover 20 via a locking portion 21 is provided. The bracket 22 is provided with a mounting portion 23 for mounting the drainage pump 1 to other equipment.

回転羽根３０は、ポンプ室Ｋ内に回転可能に収容されており、羽根軸部３１と、羽根軸部３１の外周部から放射方向に延びる複数の平板状の大径羽根（図示なし）が内側に設けられた大径羽根部３２と、大径羽根部３２の下端に連結されるとともに吸込部１２に挿入される４枚の平板状の小径羽根が設けられた小径羽根部３３とを有している。羽根軸部３１は、カバー２０の中央に形成された貫通孔２０ａに挿通されて上方に突出している。 The rotary blade 30 is rotatably housed in the pump chamber K, and the blade shaft portion 31 and a plurality of flat plate-shaped large-diameter blades (not shown) extending in the radial direction from the outer peripheral portion of the blade shaft portion 31 are inside. Has a large-diameter blade portion 32 provided in the above, and a small-diameter blade portion 33 provided with four flat plate-shaped small-diameter blades 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 into a through hole 20a formed in the center of the cover 20 and projects upward.

モーター４０は、カバー２０内に収容されており、モーター４０の駆動軸がポンプ室Ｋ内に配置された回転羽根３０の羽根軸部３１の挿入穴に挿入されて回転羽根３０を支持する。 The motor 40 is housed 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 arranged in the pump chamber K to support the rotary blade 30.

次に、本実施形態の排水ポンプ１の動作（作用）について説明する。 Next, the operation (action) of the drainage pump 1 of the present embodiment will be described.

モーター４０により回転羽根３０が回転されると、吸込部１２の先端１２ａからポンプ室Ｋ内にドレン水が吸い上げられて吐出部１３を通じて排出される。このとき、吐出部１３の内面１３ｓの底部１３ｔ全体が、本体部１１の開口１１ａから吐出部１３の先端１３ａに向かうにしたがって徐々に位置が高くなる曲面状に形成されており、当該底部１３ｔに凹部がないことから、回転羽根３０の回転が停止した際に、吐出部１３内のドレン水が重力によって底部１３ｔを伝って本体部１１の開口１１ａからポンプ室Ｋに流れ落ちる。また、吐出部１３の先端１３ａの端面１３ａ１が、外周縁の位置よりも内周縁の位置が低いテーパー状に形成されているので、端面１３ａ１上のドレン水は吐出部１３内に流れ落ちる。 When the rotary blade 30 is rotated by the motor 40, drain water is sucked up into the pump chamber K from the tip 12a of the suction portion 12 and discharged through the discharge portion 13. At this time, the entire bottom 13t of the inner surface 13s of the discharge portion 13 is formed in a curved surface shape in which the position gradually increases from the opening 11a of the main body 11 toward the tip 13a of the discharge portion 13. Since there is no recess, when the rotation of the rotary blade 30 is stopped, the drain water in the discharge portion 13 flows down the bottom portion 13t by gravity from the opening 11a of the main body portion 11 to the pump chamber K. Further, since the end surface 13a1 of the tip 13a of the discharge portion 13 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, the drain water on the end surface 13a1 flows down into the discharge portion 13.

以上より、本実施形態の排水ポンプ１によれば、吐出部１３の内面１３ｓの底部１３ｔが、本体部１１の開口１１ａから吐出部１３の先端１３ａに向かうにしたがって徐々に位置が高くなる曲面部分により構成されており、すなわち、吐出部１３の内面１３ｓの底部１３ｔが、凹部のない形状に形成されている。そのため、吐出部１３の内面１３ｓの底部１３ｔにおける任意の２点を比較したときに、開口１１ａ側寄りの点の位置が、先端１３ａ側寄りの点の位置より同じ高さかまたは低い位置となり、回転羽根３０が停止した場合に、吐出部１３内のドレン水が先端１３ａ側から本体部１１の開口１１ａ側に向かって流れやすくなる。これにより、吐出部１３の内面１３ｓの底部１３ｔに水が溜まってしまうことを抑制することができる。 From the 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 arbitrary two points on the bottom 13t of the inner surface 13s of the discharge portion 13, the position of the point closer to the opening 11a side becomes the same height or lower than the position of the point closer to the tip 13a side, and the rotation occurs. When the blade 30 is stopped, the drain water in the discharge portion 13 tends to flow from the tip 13a side toward the opening 11a side of the main body portion 11. As a result, it is possible to prevent water from accumulating on the bottom portion 13t of the inner surface 13s of the discharge portion 13.

（本発明の第１実施形態の変形例）
上述した実施形態では、吐出部１３の内面１３ｓは、底部１３ｔ全体が本体部１１の開口１１ａから吐出部１３の先端１３ａに向かうにしたがって徐々に位置が高くなる断面円弧状の曲面（すなわち曲面部分）となるように形成された構成であったが、本発明はこれのみに限定されるものではない。以下に、上述した第１実施形態の排水ポンプ１の第１変形例〜第５変形例の構成について図２〜図５を参照して説明する。図２〜図５において、図１と同一の符号は、同一又は同等部分を表している。(Modified Example of First Embodiment of the Present Invention)
In the above-described embodiment, the inner surface 13s of the discharge portion 13 has an arcuate curved surface (that is, a curved surface portion) in which the position of the entire bottom portion 13t gradually increases from the opening 11a of the main body 11 toward the tip 13a of the discharge portion 13. ), But the present invention is not limited to this. Hereinafter, the configurations of the first modification to the fifth modification of the drainage pump 1 of the first embodiment described above will be described with reference to FIGS. 2 to 5. In FIGS. 2 to 5, the same reference numerals as those in FIG. 1 represent the same or equivalent portions.

（第１変形例）
例えば、上述した第１実施形態の排水ポンプ１において、図２に示すように、吐出部１３に代えて吐出部５３が設けられた構成の排水ポンプ１Ａとしてもよい。吐出部５３は、略Ｌ字状に形成されており、先端５３ａが上方に向けて配置されるとともに基端５３ｂが本体部１１の開口１１ａを囲むようにして本体部１１の側部に一体に連接されている。吐出部５３は、本体部１１の開口１１ａを通じてポンプ室Ｋに連通されている。(First modification)
For example, in the drainage pump 1 of the first embodiment described above, as shown in FIG. 2, the drainage pump 1A may be provided with a discharger 53 instead of the discharger 13. The discharge portion 53 is formed in a substantially L shape, the tip end 53a is arranged upward, and the base end 53b is integrally connected to the side portion of the main body portion 11 so as to surround the opening 11a of the main body portion 11. ing. The discharge portion 53 is communicated with the pump chamber K through the opening 11a of the main body portion 11.

吐出部５３は、内部空間の中心軸が斜め上方に延びる横管５５と、横管５５の先端に連接された中心軸が上方（当該排水ポンプの真上方向）に延びる継手管５８とを有している。継手管５８の内面５８ｓは、鉛直方向に沿うように形成されている。横管５５の内面５５ｓは、底部５５ｔ全体が本体部１１の開口１１ａから継手管５８の内面５８ｓに突き当たるまで徐々に位置が高くなる傾斜面（すなわち傾斜部分）となるように形成されている。また、横管５５の内面５５ｓの底部５５ｔは、全体が傾斜面となるように形成されていることから凹部のない形状に形成されている。また、吐出部５３の先端５３ａの端面５３ａ１は、円環状でかつ外周縁の位置よりも内周縁の位置が低いテーパー状に形成されている。なお、図２においては、継手管５８はその中心軸が上方に延びるように形成されているが、真上ではなく斜め上方に延びるように設けられてもよい。 The discharge portion 53 includes a horizontal pipe 55 in which the central axis of the internal space extends diagonally upward, and a joint pipe 58 in which the central axis connected to the tip of the horizontal pipe 55 extends upward (directly above the drainage pump). are doing. The inner surface 58s of the joint pipe 58 is formed along the vertical direction. The inner surface 55s of the horizontal pipe 55 is formed so that the entire bottom portion 55t becomes an inclined surface (that is, an inclined portion) whose position gradually increases from the opening 11a of the main body 11 to the inner surface 58s of the joint pipe 58. Further, since the bottom portion 55t of the inner surface 55s of the horizontal pipe 55 is formed so as to be an inclined surface as a whole, it is formed in a shape without recesses. Further, the end surface 53a1 of the tip end 53a of the discharge portion 53 is formed in an annular shape and has a tapered shape in which the position of the inner peripheral edge is 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 it may be provided so as to extend diagonally upward instead of directly above.

（第２変形例）
または、例えば、上述した第１実施形態の排水ポンプ１において、図３に示すように、吐出部１３に代えて吐出部６３が設けられた構成の排水ポンプ１Ｂとしてもよい。吐出部６３は、角部が丸みを帯びた略Ｌ字状に形成されており、先端６３ａが上方に向けて配置されるとともに基端６３ｂが本体部１１の開口１１ａを囲むようにして本体部１１の側部に一体に連接されている。吐出部６３は、本体部１１の開口１１ａを通じてポンプ室Ｋに連通されている。なお、吐出部６３は本体部１１と一体に形成された第１部分６３ｃの先端に別途形成された第２部分６３ｄを接着や溶着などにより固定して取り付けることにより構成されている。(Second modification)
Alternatively, for example, in the drainage pump 1 of the first embodiment described above, as shown in FIG. 3, the drainage pump 1B may be provided with a discharger 63 instead of the discharger 13. The discharge portion 63 is formed in a substantially L-shape with rounded corners, the tip end 63a is arranged upward, and the base end 63b surrounds the opening 11a of the main body portion 11. It is integrally connected to the side part. The discharge portion 63 is communicated with the pump chamber K through the opening 11a of the main body portion 11. The discharge portion 63 is configured by fixing and attaching a second portion 63d separately formed to the tip of the first portion 63c integrally formed with the main body portion 11 by adhesion or welding.

吐出部６３は、中心軸が水平方向に延びる横管６５と、横管６５の先端に連結されるとともにその先端近傍で円弧を描いて上方を向く継手管６８とを有している。継手管６８の内面６８ｓは、鉛直方向に沿うように形成されている。横管６５の内面６５ｓは、底部６５ｔが、一端が本体部１１の開口１１ａに連なる水平部分６５ｔ１と、水平部分６５ｔ１の他端に連なり、本体部１１の開口１１ａ側から継手管６８の内面６８ｓに至るまで徐々に位置が高くなる断面円弧状の曲面部分６５ｔ２とで構成されている。また、横管６５の内面６５ｓの底部６５ｔは、水平部分６５ｔ１および曲面部分６５ｔ２で構成されていることから凹部のない形状に形成されている。なお、図３においては継手管６８の先端は上方（真上）を向くように構成されているが、斜め上方に沿うように構成されてもよい。 The discharge portion 63 has a horizontal pipe 65 whose central axis extends in the horizontal direction, and a joint pipe 68 which is connected to the tip of the horizontal pipe 65 and faces upward in an arc in the vicinity of the tip. The inner surface 68s of the joint pipe 68 is formed along the vertical direction. The inner surface 65s of the horizontal pipe 65 has a bottom portion 65t that is connected to a horizontal portion 65t1 whose one end is connected to the opening 11a of the main body 11 and to the other end of the horizontal portion 65t1 and is connected to the other end of the horizontal portion 65t1. It is composed of a curved surface portion 65t2 having an arcuate cross section whose position gradually rises up to. Further, the bottom portion 65t of the inner surface 65s of the horizontal pipe 65 is formed in a shape without recesses because it is composed of a horizontal portion 65t1 and a curved surface portion 65t2. Although the tip of the joint pipe 68 is configured to face upward (directly above) in FIG. 3, it may be configured to be oriented diagonally upward.

（第３変形例）
または、例えば、上述した第１実施形態の排水ポンプ１において、図４（ａ）に示すように、吐出部１３に代えて吐出部７３が設けられた構成の排水ポンプ１Ｃとしてもよい。吐出部７３は、略Ｌ字状に形成されており、先端７３ａが上方に向けて配置されるとともに基端７３ｂが本体部１１の開口１１ａを囲むようにして本体部１１の側部に一体に連接されている。吐出部７３は、本体部１１の開口１１ａを通じてポンプ室Ｋに連通されている。(Third modification example)
Alternatively, for example, in the drainage pump 1 of the first embodiment described above, as shown in FIG. 4A, the drainage pump 1C may be provided with a discharger 73 instead of the discharger 13. The discharge portion 73 is formed in a substantially L shape, the tip 73a is arranged upward, and the base end 73b is integrally connected to the side portion of the main body 11 so as to surround the opening 11a of the main body 11. ing. The discharge portion 73 is communicated with the pump chamber K through the opening 11a of the main body portion 11.

吐出部７３は、中心軸が水平方向に延びる小径部７６および大径部７７を有する水平管７５と、水平管７５の先端７５ａ付近に連接され、中心軸が上方に延びる継手管７８とを有している。継手管７８の内面７８ｓは、鉛直方向（上方）に沿うように形成されている。水平管７５は、内面７５ｓの底部７５ｔが水平面（すなわち、水平部分）となるように小径部７６の中心軸と大径部７７の中心軸とが鉛直方向にずれて、すなわち小径部７６の底部と大径部７７の底部とが直線状に接するように（内接するように）配置されている。水平管７５の先端７５ａには、成形時に用いる金型を抜き取るための型抜孔７５ｂが設けられている。さらに、型抜孔７５ｂを塞ぐキャップ部材７９が設けられており、キャップ部材７９の円柱部７９ａが型抜孔７５ｂに挿入嵌合され、円柱部７９ａの端部に設けられた円板部７９ｂの周縁が水平管７５の先端７５ａに接着や溶着により取り付けられている。 The discharge portion 73 includes a horizontal pipe 75 having a small diameter portion 76 and a large diameter portion 77 whose central axis extends in the horizontal direction, and a joint pipe 78 which is connected to the vicinity of the tip 75a of the horizontal pipe 75 and whose central axis extends upward. are doing. The inner surface 78s of the joint pipe 78 is formed along the vertical direction (upper side). In the horizontal pipe 75, the central axis of the small diameter portion 76 and the central axis of the large diameter portion 77 are vertically displaced so that the bottom portion 75t of the inner surface 75s is 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 (inscribed). The tip 75a of the horizontal pipe 75 is provided with a die punching hole 75b for punching out a mold used at the time of molding. Further, a cap member 79 for closing the die-cutting hole 75b is provided, the columnar portion 79a of the cap member 79 is inserted and fitted into the die-cutting hole 75b, and the peripheral edge of the disk portion 79b provided at the end of the columnar portion 79a is provided. It is attached to the tip 75a of the horizontal pipe 75 by adhesion or welding.

水平管７５の内面７５ｓは、底部７５ｔ全体が本体部１１の開口１１ａから吐出部７３の先端７３ａ側に向かいキャップ部材７９に突き当たるまで同一高さの水平面（すなわち水平部分）となるように形成されている。また、水平管７５の内面７５ｓの底部７５ｔは、全体が水平面となるように形成されていることから凹部のない形状に形成されている。 The inner surface 75s of the horizontal pipe 75 is formed so that the entire bottom portion 75t is a horizontal plane (that is, a horizontal portion) having the same height from the opening 11a of the main body 11 toward the tip 73a side of the discharge portion 73 until it hits the cap member 79. ing. Further, since the bottom portion 75t of the inner surface 75s of the horizontal pipe 75 is formed so as to be a horizontal plane as a whole, it is formed in a shape without recesses.

（第４変形例）
または、例えば、上述した第１実施形態の第３変形例の排水ポンプ１Ｃにおいて、図４（ｂ）に示すように、キャップ部材７９に代えてキャップ部材７９Ａが設けられた構成の排水ポンプ１Ｄとしてもよい。キャップ部材７９Ａは、円柱部７９ａの端面７９ｔが、本体部１１の開口１１ａから吐出部７３の先端７３ａ側に向かい徐々に位置が高くなる傾斜面（すなわち傾斜部分）となるように形成されている。この端面７９ｔは、水平管７５の内面７５ｓの底部７５ｔにおけるキャップ部材７９Ａの円柱部７９ａと重なる水平部分７５ｔ１に代わって、当該底部７５ｔとなる。(Fourth modification)
Alternatively, for example, in the drainage pump 1C of the third modification of the first embodiment described above, as shown in FIG. 4B, the drainage pump 1D has a configuration in which the cap member 79A is provided instead of the cap member 79. May be 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 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 that overlaps the columnar portion 79a of the cap member 79A at the bottom portion 75t of the inner surface 75s of the horizontal pipe 75.

これにより、水平管７５の内面７５ｓは、一端が本体部１１の開口１１ａに連なる水平部分７５ｔ２と、水平部分７５ｔ２の他端に連なるキャップ部材７９Ａの端面７９ｔ（傾斜部分）とで構成されている。また、水平管７５の内面７５ｓの底部７５ｔは、水平部分７５ｔ２および端面７９ｔで構成されていることから凹部のない形状に形成されている。 As a result, the inner surface 75s of the horizontal pipe 75 is composed of a horizontal portion 75t2 whose one end is connected to the opening 11a of the main body portion 11 and an end surface 79t (inclined portion) of the cap member 79A which is connected to the other end of the horizontal portion 75t2. .. Further, since the bottom portion 75t of the inner surface 75s of the horizontal pipe 75 is composed of the horizontal portion 75t2 and the end surface 79t, it is formed in a shape without recesses.

（第５変形例）
または、例えば、上述した実施形態の排水ポンプ１において、図５に示すように、吐出部１３に代えて吐出部８３が設けられた構成の排水ポンプ１Ｅとしてもよい。図５は、第１実施形態の排水ポンプ１の第５変形例の構成を説明する図であって、（ａ）は一部断面図を含む正面図であり、（ｂ）は吐出部８３の先端８３ａの平面図である。(Fifth modification)
Alternatively, for example, in the drainage pump 1 of the above-described embodiment, as shown in FIG. 5, the drainage pump 1E may be provided with a discharger 83 instead of the discharger 13. 5A and 5B are views for explaining the configuration of a fifth modification of the drainage pump 1 of the first embodiment, FIG. 5A is a front view including a partial cross-sectional view, and FIG. 5B is a discharge unit 83. It is a top view of the tip 83a.

吐出部８３は、内面８３ｓで囲われた内側空間８３ｖの中心軸が円弧状となるように形成されており、先端８３ａが上方に向けて配置されるとともに基端８３ｂが本体部１１の開口１１ａを囲むようにして本体部１１の側部に一体に連接されている。吐出部８３は、本体部１１の開口１１ａを通じてポンプ室Ｋに連通されている。この例においては、吐出部８３は、本体部１１と一体的に樹脂成型されている。 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 tip 83a is arranged upward, and the base end 83b is the opening 11a of the main body 11. Is integrally connected to the side portion of the main body portion 11 so as to surround the main body portion 11. The discharge portion 83 is communicated with the pump chamber K through the opening 11a of the main body portion 11. In this example, the discharge portion 83 is integrally resin-molded with the main body portion 11.

吐出部８３の内面８３ｓは、底部８３ｔ全体が本体部１１の開口１１ａから吐出部８３の先端８３ａに向かうにしたがって徐々に位置が高くなる断面円弧状の曲面（すなわち曲面部分）となるように形成されている。また、吐出部８３の内面８３ｓの底部８３ｔは、全体が曲面となるように形成されていることから凹部のない形状に形成されている。 The inner surface 83s of the discharge portion 83 is formed so that the entire bottom portion 83t becomes a curved surface (that is, a curved surface portion) having an arcuate cross section whose position gradually increases from the opening 11a of the main body 11 toward the tip 83a of the discharge portion 83. Has been done. Further, the bottom portion 83t of the inner surface 83s of the discharge portion 83 is formed so as to have a curved surface as a whole, so that it is formed in a shape without recesses.

吐出部８３の先端８３ａの端面８３ａ１は、円環状でかつ外周縁の位置よりも内周縁の位置が低いテーパー状に形成されている。端面８３ａ１は、円環状でかつ外周縁の位置と内周縁の位置とが同じ高さとなる平面状であってもよいが、少なくとも一部分において、外周縁の位置よりも内周縁の位置が低いテーパー状であることが好ましい。 The end surface 83a1 of the tip 83a of the discharge portion 83 is formed in an annular shape and has a tapered shape in which the position of the inner peripheral edge is lower than the position of the outer peripheral edge. The end face 83a1 may be annular and may have a planar shape in which the position of the outer peripheral edge and the position of the inner peripheral edge are at the same height, but at least in a part, the end face 83a1 has a tapered shape in which the position of the inner peripheral edge is lower than the position of the outer peripheral edge. Is preferable.

また、吐出部８３の先端８３ａの端面８３ａ１は、本体部１１に近い内側部分８３ａ１１における外周縁から内周縁までの長さＬ１が、本体部１１から遠い外側部分８３ａ１２における外周縁から内周縁までの長さＬ２より長い。また、端面８３ａ１の外周縁から内周縁の長さは、内側部分８３ａ１１から外側部分８３ａ１２に向かうにしたがって徐々に短くなるように形成されている。 Further, the end surface 83a1 of the tip end 83a of the discharge portion 83 has a length L1 from the outer peripheral edge to the inner peripheral edge in the inner peripheral portion 83a11 near the main body portion 11 from the outer peripheral edge to the inner peripheral edge in the outer peripheral portion 83a12 far from the main body portion 11. Longer than length L2. Further, the length from the outer peripheral edge to the inner peripheral edge of the end surface 83a1 is formed so as to gradually decrease from the inner peripheral portion 83a11 to the outer peripheral portion 83a12.

すなわち、第５変形例の排水ポンプ１Ｅは、モーター４０で回転されることにより水を吸い上げる回転羽根３０が収容されるハウジング１０を有する排水ポンプ１Ｅであって、ハウジング１０が、水が流れ込む空間が内側に設けられた本体部１１と、本体部１１に設けられた開口１１ａを通じて前記空間と連通された管状の吐出部８３とを有し、吐出部８３の先端８３ａが、開口１１ａより高い位置に配置され、吐出部８３の内面８３ｓの底部８３ｔが、開口１１ａ側から先端８３ａ側に向かうにしたがって徐々に位置が高くなる曲面部分より構成され、吐出部８３の先端８３ａの端面８３ａ１の内側部分８３ａ１１における外周縁から内周縁までの長さＬ１が、外側部分８３ａ１２における外周縁から内周縁までの長さＬ２より長く形成されている。すなわち、内側空間８３ｖの開口部（吐出部８３の端面における開口部）の中心は、吐出部８３の端面形状の輪郭の中心から外側（ポンプ室Ｋから離れる側）に偏心している。 That is, the drainage pump 1E of the fifth modification is a drainage pump 1E having a housing 10 in which a rotary blade 30 that sucks up water by being rotated by a motor 40 is housed, and the housing 10 has a space into which water flows. It has a main body portion 11 provided inside and a tubular discharge portion 83 communicated with the space through an opening 11a provided in the main body portion 11, and the tip 83a of the discharge portion 83 is located higher than the opening 11a. The bottom portion 83t of the inner surface 83s of the discharge portion 83 is composed of a curved surface portion whose position gradually increases from the opening 11a side toward the tip 83a side, and the inner portion 83a11 of the end surface 83a1 of the tip 83a of the discharge portion 83. The length L1 from the outer peripheral edge to the inner peripheral edge is formed longer than the length L2 from the outer peripheral edge to the inner peripheral edge in the outer peripheral portion 83a12. That is, the center of the opening of the inner space 83v (the opening on the end face of the discharge portion 83) is eccentric from the center of the contour of the end face shape of the discharge portion 83 to the outside (the side away from the pump chamber K).

このようにすることで、回転羽根３０の回転によりドレン水が吸い上げられて吐出部８３および当該吐出部８３の先端８３ａに接続された図示しないホースを通じて排出される場合に、ホース内のドレン水が重力により下方に向かおうとして生じる圧力の一部を端面８３ａ１で受けることにより、回転羽根３０がドレン水から受ける圧力を減少させることができる。そして、端面８３ａ１の内側部分８３ａ１１における外周縁から内周縁までの長さＬ１を、外側部分８３ａ１２における外周縁から内周縁までの長さＬ２より長くすることで、内側部分８３ａ１１を広くすることができ、上記圧力を受ける受圧面として効果的に機能する面積を確保することができる。そのため、吐出揚程を効果的に向上させることができる。 By doing so, when the drain water is sucked up by the rotation of the rotary blade 30 and discharged through the discharge portion 83 and the hose (not shown) connected to the tip 83a of the discharge portion 83, the drain water in the hose is discharged. The pressure received by the rotary blade 30 from the drain water can be reduced by receiving a part of the pressure generated by the gravity toward the downward direction on the end face 83a1. Then, the inner portion 83a11 can be widened by making the length L1 from the outer peripheral edge to the inner peripheral edge of the inner portion 83a11 of the end surface 83a1 longer than the length L2 from the outer peripheral edge to the inner peripheral edge of the outer peripheral portion 83a12. , It is possible to secure an area that effectively functions as a pressure receiving surface that receives the above pressure. Therefore, the discharge head can be effectively improved.

なお、内側空間８３ｖの開口部の中心は、吐出部８３の端面形状の輪郭の中心から外側に偏心しているものとして説明したが、本発明はこれのみに限定されることはなく、吐出部８３の端面形状の輪郭中心から内側（ポンプ室Ｋに近づく側）に偏心していても良いし、また回転羽根３０の回転方向側に偏心していても良い。 Although the center of the opening of the inner space 83v has been described as being eccentric to the outside from the center of the contour of the end face shape of the discharge portion 83, the present invention is not limited to this, and the discharge portion 83 is not limited to this. It may be eccentric from the center of the contour of the end face shape to the inside (the side approaching the pump chamber K), or may be eccentric to the rotation direction side of the rotary blade 30.

すなわち、吐出部８３の先端８３ａの端面８３ａ１の肉厚は、少なくともその外周方向の一部領域において、異なる厚みを有していれば良い。 That is, the wall thickness of the end surface 83a1 of the tip 83a of the discharge portion 83 may have a different thickness at least in a part of the outer peripheral direction.

また、吐出部８３の先端８３ａの端面８３ａ１の肉厚として、吐出部８３が必要とする強度以上の強度が得られるような厚さであれば、該端面８３ａ１の肉厚は均一であっても良い。 Further, if the wall thickness of the end face 83a1 of the tip 83a of the discharge portion 83 is such that a strength higher than the strength required by the discharge portion 83 can be obtained, the wall thickness of the end face 83a1 may be uniform. good.

これら第１変形例〜第５変形例においても、上述した実施形態の排水ポンプ１と同様の作用効果を奏する。 In these first modified examples to the fifth modified examples, the same action and effect as those of the drainage pump 1 of the above-described embodiment are obtained.

（本発明の第２実施形態）
以下、本発明の第２実施形態に係る排水ポンプについて図６を参照して説明する。(Second Embodiment of the present invention)
Hereinafter, the drainage pump according to the second embodiment of the present invention will be described with reference to FIG.

図６は、本発明の第２実施形態に係る排水ポンプの構成を説明する図であって、（ａ）は一部断面図を含む正面図であり、（ｂ）は吐出部付近の拡大断面図であり、（ｃ）は図６（ａ）のＸ−Ｘ線に沿う断面図の一例であり、（ｄ）は図６（ａ）のＸ−Ｘ線に沿う断面図の他の例である。 6A and 6B are views for explaining the configuration of the drainage pump according to the second embodiment of the present invention, FIG. 6A is a front view including a partial cross-sectional view, and FIG. 6B is an enlarged cross-sectional view near the discharge portion. FIG. 6C is an example of a cross-sectional view taken along line XX of FIG. 6A, and FIG. 6D is another example of a cross-sectional view taken along line XX of FIG. 6A. is there.

図６に示す本実施形態の排水ポンプ２は、上述した第１実施形態の排水ポンプ１において、ハウジング１０が、吐出部１３に代えて内面に段部が形成された吐出部１１３を有すること以外は第１実施形態の排水ポンプ１と同一の構成を有している。そのため、第１実施形態の排水ポンプ１と同一の構成について同一の符号を付して説明を省略する。 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 components as those of the drainage pump 1 of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

吐出部１１３は、内面１１３ｓで囲われた内側空間が概ね円弧状となるように形成されており、先端１１３ａが上方に向けて配置されるとともに基端１１３ｂが本体部１１の開口１１ａを囲むようにして本体部１１の側部に一体に連接されている。吐出部１１３は、本体部１１の開口１１ａを通じてポンプ室Ｋに連通されている。この例においては、吐出部１１３は、本体部１１と一体的に樹脂成型されている。 The discharge portion 113 is formed so that the inner space surrounded by the inner surface 113s is substantially arcuate, the tip 113a is arranged upward, and the base end 113b surrounds the opening 11a of the main body 11. It is integrally connected to the side portion of the main body portion 11. The discharge portion 113 is communicated with the pump chamber K through the opening 11a of the main body portion 11. In this example, the discharge portion 113 is integrally resin-molded with the main body portion 11.

吐出部１１３の内面１１３ｓは、底部１１３ｔ全体が本体部１１の開口１１ａから吐出部１１３の先端１１３ａに向かうにしたがって徐々に位置が高くなる断面円弧状の曲面（すなわち曲面部分）となるように形成されている。また、吐出部１１３の内面１１３ｓの底部１１３ｔは、全体が曲面となるように形成されていることから凹部のない形状に形成されている。 The inner surface 113s of the discharge portion 113 is formed so that the entire bottom portion 113t becomes a curved surface (that is, a curved surface portion) having an arcuate cross section whose position gradually increases toward the tip 113a of the discharge portion 113 from the opening 11a of the main body portion 11. Has been done. Further, since the bottom portion 113t of the inner surface 113s of the discharge portion 113 is formed so as to have a curved surface as a whole, it is formed in a shape without recesses.

吐出部１１３の内面１１３ｓは、該内面１１３ｓの上面側（底部１１３ｔと対向する側）において、下流側（先端１１３ａ側）を向く受圧面１１３ｕ１を有する段部１１３ｕを有している。本発明において、「下流側を向く面（受圧面）」とは、吐出部１１３の内面１１３ｓがその中心方向に突出している部分において、下流側（すなわち当該排水ポンプの動作時の流体流出方向）を向いている面を言う。図６（ｂ）の事例においては、段部１１３ｕの表面のうち、下流側を向いている面を言う。 The inner surface 113s of the discharge portion 113 has a step portion 113u having a pressure receiving surface 113u1 facing the downstream side (tip 113a side) on the upper surface side (the side facing the bottom portion 113t) of the inner surface 113s. In the present invention, the "surface facing the downstream side (pressure receiving surface)" is the downstream side (that is, the fluid outflow direction during operation of the drainage pump) at the portion where the inner surface 113s of the discharge portion 113 projects toward the center thereof. Say the side facing. In the case of FIG. 6B, it refers to the surface of the stepped portion 113u facing the downstream side.

なお、図６（ｂ）に示された例においては、段部１１３ｕの下流側を向く面（受圧面）は、下流側に対してほぼ直交するように形成されている。言い換えれば、段部１１３ｕの下流側を向く面は、当該排水ポンプの動作停止時における吐出水が逆流する方向に対して直交するようにされている。なお、段部１１３ｕの下流側を向く面は、下流側に対して傾斜していても良く、要は吐出水の逆流に対して抵抗となるような面（受圧面）が段部１１３ｕに設けられていれば良い。 In the example shown in FIG. 6B, the surface (pressure receiving surface) facing the downstream side of the step portion 113u is formed so as to be substantially orthogonal to the downstream side. In other words, the surface of the step portion 113u facing the downstream side is orthogonal to the direction in which the discharged water flows backward when the operation of the drainage pump is stopped. The surface of the step portion 113u facing the downstream side may be inclined with respect to the downstream side. In short, the step portion 113u is provided with a surface (pressure receiving surface) that resists the backflow of discharged water. It should be done.

本実施形態において、段部１１３ｕは先端１１３ａ寄りに設けられ、受圧面１１３ｕ１は底部１１３ｔの円弧の中心に向かう方向に形成されている。吐出部１１３は、段部１１３ｕを有することにより、段部１１３ｕから先端１１３ａ寄りの箇所の内径が、段部１１３ｕからポンプ室Ｋ寄りの箇所の内径より大きくなるように形成されている。 In the present embodiment, the step portion 113u is provided closer to the tip 113a, and the pressure receiving surface 113u1 is formed in the direction toward the center of the arc of the bottom portion 113t. Since the discharge portion 113 has the step portion 113u, the inner diameter of the portion closer to the tip 113a from the step portion 113u is formed to be larger than the inner diameter of the portion closer to the pump chamber K from the step portion 113u.

本実施形態において、受圧面１１３ｕ１は、図６（ｃ）に示すように、円形状の面に底部１１３ｔにて内接する円形状の開口（内面１１３ｓ）が設けられた形状を有している。これ以外にも、受圧面１１３ｕ１は、図６（ｄ）に示すように三日月形状を有していてもよく、本発明の目的に反しない限り、受圧面１１３ｕ１の形状は任意である。 In the present embodiment, as shown in FIG. 6C, the pressure receiving surface 113u1 has a shape in which a circular opening (inner surface 113s) inscribed at the bottom 113t is provided on the circular surface. In addition to this, 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 it does not contradict the object of the present invention.

吐出部１１３の先端１１３ａの端面１１３ａ１は、円環状でかつ外周縁の位置よりも内周縁の位置が低いテーパー状に形成されている。 The end surface 113a1 of the tip 113a of the discharge portion 113 is formed in an annular shape and has a tapered shape in which the position of the inner peripheral edge is lower than the position of the outer peripheral edge.

本実施形態の排水ポンプ２は、上述した第１実施形態の排水ポンプの動作（作用）に加えて、次の作用を有する。 The drainage pump 2 of the present embodiment has the following actions in addition to the operation (action) of the drainage pump of the first embodiment described above.

すなわち、排水ポンプ２は、回転羽根３０の回転によりドレン水が吸い上げられて吐出部１１３および当該吐出部１１３の先端１１３ａに接続された図示しないホースを通じて排出される場合に、吐出部内およびホース内のドレン水が重力により下方に向かおうとして生じる圧力の一部を受圧面１１３ｕ１で受ける。 That is, when the drain water is sucked up by the rotation of the rotary blade 30 and discharged through the discharge unit 113 and a hose (not shown) connected to the tip 113a of the discharge unit 113, the drainage pump 2 is inside the discharge unit and inside the hose. The pressure receiving surface 113u1 receives a part of the pressure generated when the drain water tends to move downward due to gravity.

以上より、本実施形態の排水ポンプ２によれば、ドレン水の排出に際し、吐出部１１３内および吐出部１１３に接続された図示しないホース内のドレン水が重力により下方に向かおうとして生じる圧力の一部を受圧面１１３ｕ１で受けるので、回転羽根３０がドレン水から受ける圧力を減少させることができる。そのため、吐出揚程を効果的に向上させることができる。 From the above, according to the drainage pump 2 of the present embodiment, when the drain water is discharged, the pressure generated when the drain water in the discharge portion 113 and in the hose (not shown) connected to the discharge portion 113 tends to move downward due to gravity. Since a part of the pressure is received by the pressure receiving surface 113u1, the pressure received by the rotary blade 30 from the drain water can be reduced. Therefore, the discharge head can be effectively improved.

（第１変形例）
例えば、上述した第２実施形態の排水ポンプ２において、図７に示すように、吐出部１１３に代えて吐出部１２３が設けられた構成の排水ポンプ２Ａとしてもよい。図７は、第２実施形態の排水ポンプ２の第１変形例の構成を説明する図であって、（ａ）は一部断面図を含む正面図であり、（ｂ）は吐出部１２３付近の拡大断面図である。(First modification)
For example, in the drainage pump 2 of the second embodiment described above, as shown in FIG. 7, the drainage pump 2A may be provided with a discharger 123 instead of the discharger 113. 7A and 7B are views for explaining the configuration of the first modification of the drainage pump 2 of the second embodiment, FIG. 7A is a front view including a partial cross-sectional view, and FIG. 7B is a vicinity of the discharge portion 123. It is an enlarged sectional view of.

吐出部１２３は、内面１２３ｓで囲われた内側空間が概ね円弧状となるように形成されており、先端１２３ａが上方に向けて配置されるとともに基端１２３ｂが本体部１１の開口１１ａを囲むようにして本体部１１の側部に一体に連接されている。吐出部１２３は、本体部１１の開口１１ａを通じてポンプ室Ｋに連通されている。 The discharge portion 123 is formed so that the inner space surrounded by the inner surface 123s is substantially arcuate, the tip 123a is arranged upward, and the base end 123b surrounds the opening 11a of the main body 11. It is integrally connected to the side portion of the main body portion 11. The discharge portion 123 is communicated with the pump chamber K through the opening 11a of the main body portion 11.

吐出部１２３の内面１２３ｓは、底部１２３ｔ全体が本体部１１の開口１１ａから吐出部１２３の先端１２３ａに向かうにしたがって徐々に位置が高くなる断面円弧状の曲面（すなわち曲面部分）となるように形成されている。また、吐出部１２３の内面１２３ｓの底部１２３ｔは、全体が曲面となるように形成されていることから凹部のない形状に形成されている。 The inner surface 123s of the discharge portion 123 is formed so that the entire bottom portion 123t becomes a curved surface (that is, a curved surface portion) having an arcuate cross section whose position gradually increases from the opening 11a of the main body 11 toward the tip 123a of the discharge portion 123. Has been done. Further, the bottom portion 123t of the inner surface 123s of the discharge portion 123 is formed so as to have a curved surface as a whole, so that it is formed in a shape without recesses.

吐出部１２３の内面１２３ｓは、該内面１２３ｓの上面側（底部１２３ｔと対向する側）において、下流側（先端１２３ａ側）を向く受圧面１２３ｕ１を有する段部１２３ｕを有している。本実施形態において、段部１２３ｕは先端１２３ａと基端１２３ｂとの間に設けられ、受圧面１２３ｕ１は鉛直方向に沿うように形成されている。吐出部１２３は、段部１２３ｕを有することにより、段部１２３ｕから先端１２３ａ寄りの箇所の内径が、段部１２３ｕからポンプ室Ｋ寄りの箇所の内径より大きくなるように形成されている。 The inner surface 123s of the discharge portion 123 has a step portion 123u having a pressure receiving surface 123u1 facing the downstream side (tip 123a side) on the upper surface side (the side facing the bottom portion 123t) of the inner surface 123s. In the present embodiment, the step portion 123u is provided between the tip end 123a and the base end 123b, and the pressure receiving surface 123u1 is formed along the vertical direction. By having the step portion 123u, the discharge portion 123 is formed so that the inner diameter of the portion closer to the tip 123a from the step portion 123u is larger than the inner diameter of the portion closer to the pump chamber K from the step portion 123u.

吐出部１２３の先端１２３ａの端面１２３ａ１は、円環状でかつ外周縁の位置よりも内周縁の位置が低いテーパー状に形成されている。 The end surface 123a1 of the tip 123a of the discharge portion 123 is formed in an annular shape and has a tapered shape in which the position of the inner peripheral edge is lower than the position of the outer peripheral edge.

なお、図６及び図７の事例では、受圧面１１３ｕ１、１２３ｕ１を有する段部１１３ｕ、１２３ｕは、いずれも吐出部の内面１１３ｓ、１２３ｓの湾曲中心の方向（底部１１３ｔ、１２３ｔと対向する天井側）に設けられている。このような位置に設けることにより、吐出部１１３、１２３を樹脂成型する際、内面１１３ｓ、１２３ｓを形成するための中子（図示せず）を前記湾曲の方向に引き抜くだけで吐出部１１３、１２３を形成することができ、この結果、吐出部１１３、１２３とハウジング１０とを一体的に樹脂成型することが可能となる。 In the cases of FIGS. 6 and 7, the step portions 113u and 123u having the pressure receiving surfaces 113u1 and 123u1 are all in the direction of the bending center of the inner surfaces 113s and 123s of the discharge portion (the ceiling side facing the bottom portions 113t and 123t). It is provided in. By providing the discharge portions 113 and 123 at such positions, when the discharge portions 113 and 123 are resin-molded, the discharge portions 113 and 123 are simply pulled out in the direction of the curvature by pulling out the core (not shown) for forming the inner surfaces 113s and 123s. As a result, the discharge portions 113, 123 and the housing 10 can be integrally resin-molded.

もっとも、吐出部１１３、１２３とハウジング１０とを別体に形成し、その後、両者を接着、溶着等により接合するようにすれば、受圧面１１３ｕ１、１２３ｕ１を有する段部１１３ｕ、１２３ｕは、いずれも吐出部の内面１１３ｓ、１２３ｓの湾曲中心の方向とは逆の方向（底部１１３ｔ、１２３ｔ側）やその他の側、すなわち吐出部の内面１１３ｓ、１２３ｓのいかなる箇所に設けられても良い。 However, if the discharge portions 113 and 123 and the housing 10 are formed as separate bodies and then the two are joined by adhesion, welding or the like, the step portions 113u and 123u having the pressure receiving surfaces 113u1 and 123u1 are all. It may be provided in a direction opposite to the direction of the bending center of the inner surfaces 113s and 123s of the discharge portion (bottom 113t and 123t sides) and other sides, that is, at any location on the inner surfaces 113s and 123s of the discharge portion.

この第１変形例においても、上述した第２実施形態の排水ポンプ２と同様の作用効果を奏する。 Also in this first modification, the same action and effect as the drainage pump 2 of the second embodiment described above can be obtained.

出願人らは、吐出部の内面の底部が曲面部分からなる排水ポンプである第１実施形態の排水ポンプ１（実施例１）、ならびに、第２実施形態の排水ポンプ２（実施例２）およびその第１変形例の排水ポンプ２Ａ（実施例３）を作成し、それぞれの排水ポンプについて吐出揚程を計測した。各実施例の計測結果を以下に示す。 The applicants have the drainage pump 1 (Example 1) of the first embodiment, which is a drainage pump in which the bottom of the inner surface of the discharge portion is a curved portion, and the drainage pump 2 (Example 2) of the second embodiment. A drainage pump 2A (Example 3) of the first modification was prepared, and the discharge head was measured for each drainage pump. The measurement results of each example are shown below.

実施例１：１６１５ｍｍ
実施例２：１６２５ｍｍ
実施例３：１６２５ｍｍExample 1: 1615 mm
Example 2: 1625 mm
Example 3: 1625 mm

この結果から、受圧面１１３ｕ１を有する実施例２の排水ポンプ２および受圧面１２３ｕ１を有する実施例３の排水ポンプ２Ａが、このような受圧面を有しない実施例１の排水ポンプ１より吐出揚程が高く、揚水能力がより高いことがわかる。１０ｍｍの揚程差は約１００Ｐａの圧力に相当し、この分の圧力が受圧面１１３ｕ１および受圧面１２３ｕ１により受け止められることにより、回転羽根３０がドレン水から受ける圧力が減少して、より高い吐出揚程が実現できているものと推測される。 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 lift higher than that of the drainage pump 1 of Example 1 having such a pressure receiving surface. It can be seen that it is high and the pumping capacity is higher. The lift difference of 10 mm corresponds to a pressure of about 100 Pa, and the pressure received by the pressure receiving surface 113u1 and the pressure receiving surface 123u1 reduces the pressure received by the rotary blade 30 from the drain water, resulting in a higher discharge lift. It is presumed that it has been realized.

このように、吐出揚程の計測結果からも本発明の第２実施形態にかかる構成の効果が明らかとなった。 As described above, the effect of the configuration according to the second embodiment of the present invention was clarified from the measurement result of the discharge head.

上記に本発明の実施形態を説明したが、本発明はこれらの例に限定されるものではない。前述の実施形態に対して、当業者が適宜、構成要素の追加、削除、設計変更を行ったものや、実施形態の特徴を適宜組み合わせたものも、本発明の要旨を備えている限り、本発明の範囲に含まれる。 Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. As long as the gist of the present invention is provided, a person skilled in the art appropriately adding, deleting, or changing the design of the above-described embodiment, or combining the features of the embodiment as appropriate is also present. It is included in the scope of the invention.

また、吐出部の内面に設けられる受圧面は、吐出部内面に設けられた凸部、あるいは吐出部の内部流路がポンプ室Ｋに向かうにつれて狭窄するような斜面であれば、その凸部や斜面の少なくとも一部がポンプ室Ｋ側に発生するドレン水の圧力を受けることができ、これによりポンプ室Ｋ側に戻ろうとするドレン水の力を軽減することができる。すなわち、上記の凸部や斜面の、ドレン水の圧力を受ける部分が上記の受圧面となる。 Further, if the pressure receiving surface provided on the inner surface of the discharge portion is a convex portion provided on the inner surface of the discharge portion or a slope such that the internal flow path of the discharge portion narrows toward the pump chamber K, the convex portion or At least a part of the slope can receive the pressure of the drain water generated on the pump chamber K side, whereby the force of the drain water trying to return to the pump chamber K side can be reduced. That is, the portion of the convex portion or slope that receives the pressure of the drain water becomes the pressure receiving surface.

したがって、吐出部の内面に設けられる受圧面は、吐出部内面に設けられた凸部、あるいは吐出部の内部流路がポンプ室Ｋに向かうにつれて狭窄するような斜面であれば、いかなる形状、大きさのものであっても良いし、また吐出部内部のいかなる箇所に設けられても良い。 Therefore, the pressure receiving surface provided on the inner surface of the discharge portion has any shape and size as long as it is a convex portion provided on the inner surface of the discharge portion or a slope in which the internal flow path of the discharge portion narrows toward the pump chamber K. It may be a small one, or it may be provided at any place inside the discharge portion.

（第１実施形態）
１…排水ポンプ、１０…ハウジング、１１…本体部、１１ａ…開口、１２…吸込部、１２ａ…先端、１３…吐出部、１３ａ…先端、１３ａ１…端面、１３ｂ…基端、１３ｓ…内面、１３ｔ…底部、２０…カバー、２０ａ…貫通孔、２１…係止部、２２…ブラケット、２３…取付部、３０…回転羽根、３１…羽根軸部、３２…大径羽根部、３３…小径羽根部、４０…モーター、Ｋ…ポンプ室。
（第１実施形態の第１変形例）
１Ａ…排水ポンプ、５３…吐出部、５３ａ…先端、５３ａ１…端面、５３ｂ…基端、５５…横管、５５ｓ…内面、５５ｔ…底部、５８…継手管、５８ｓ…内面。
（第１実施形態の第２変形例）
１Ｂ…排水ポンプ、６３…吐出部、６３ａ…先端、６３ｂ…基端、６３ｃ…第１部分、６３ｄ…第２部分、６５…横管、６５ｓ…内面、６５ｔ…底部、６５ｔ１…水平部分、６５ｔ２…曲面部分、６８…継手管、６８ｓ…内面。
（第１実施形態の第３変形例）
１Ｃ…排水ポンプ、７３…吐出部、７３ａ…先端、７３ｂ…基端、７５…水平管、７５ａ…先端、７５ｂ…型抜孔、７５ｓ…内面、７５ｔ…底部、７６…小径部、７７…大径部、７８…継手管、７８ｓ…内面、７９…キャップ部材、７９ａ…円柱部、７９ｂ…円板部。
（第１実施形態の第４変形例）
１Ｄ…排水ポンプ、７９Ａ…キャップ部材、７５ｔ１…キャップ部材の円柱部と重なる水平部分、７５ｔ２…水平部分、７９ｔ…端面。
（第１実施形態の第５変形例）
１Ｅ…排水ポンプ、８３…吐出部、８３ａ…先端、８３ａ１…端面、８３ａ１１…内側部分、８３ａ１２…外側部分、８３ｂ…基端、８３ｓ…内面、８３ｔ…底部、８３ｖ…内側空間、Ｌ１…内側部分における外周縁から内周縁までの長さ、Ｌ２…外側部分における外周縁から内周縁までの長さ。
（第２実施形態）
２…排水ポンプ、１１３…吐出部、１１３ａ…先端、１１３ａ１…端面、１１３ｂ…基端、１１３ｓ…内面、１１３ｔ…底部、１１３ｕ…段部、１１３ｕ１…受圧面。
（第２実施形態の第１変形例）
２Ａ…排水ポンプ、１２３…吐出部、１２３ａ…先端、１２３ａ１…端面、１２３ｂ…基端、１２３ｓ…内面、１２３ｔ…底部、１２３ｕ…段部、１２３ｕ１…受圧面。(First Embodiment)
1 ... Drainage pump, 10 ... Housing, 11 ... Main body, 11a ... Opening, 12 ... Suction, 12a ... Tip, 13 ... Discharge, 13a ... Tip, 13a1 ... End face, 13b ... Base end, 13s ... Inner surface, 13t ... bottom, 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)
1A ... drainage pump, 53 ... discharge part, 53a ... tip, 53a1 ... end face, 53b ... base end, 55 ... horizontal pipe, 55s ... inner surface, 55t ... bottom, 58 ... joint pipe, 58s ... inner surface.
(Second modification of the first embodiment)
1B ... drainage pump, 63 ... discharge part, 63a ... tip, 63b ... base end, 63c ... first part, 63d ... second part, 65 ... horizontal pipe, 65s ... inner surface, 65t ... bottom, 65t1 ... horizontal part, 65t2 ... curved surface, 68 ... joint pipe, 68s ... inner surface.
(Third variant of the first embodiment)
1C ... drainage pump, 73 ... discharge part, 73a ... tip, 73b ... base end, 75 ... horizontal pipe, 75a ... tip, 75b ... die punching hole, 75s ... inner surface, 75t ... bottom, 76 ... small diameter part, 77 ... large diameter Part, 78 ... Joint pipe, 78s ... Inner surface, 79 ... Cap member, 79a ... Cylindrical part, 79b ... Disk part.
(Fourth Modified Example of First Embodiment)
1D ... drainage pump, 79A ... cap member, 75t1 ... horizontal portion overlapping the columnar portion of the cap member, 75t2 ... horizontal portion, 79t ... end face.
(Fifth Modified Example of First Embodiment)
1E ... drainage pump, 83 ... discharge part, 83a ... tip, 83a1 ... end face, 83a11 ... inner part, 83a12 ... outer part, 83b ... base end, 83s ... inner surface, 83t ... bottom, 83v ... inner space, L1 ... inner part The length from the outer peripheral edge to the inner peripheral edge in L2 ... The length from the outer peripheral edge to the inner peripheral edge in the outer portion.
(Second Embodiment)
2 ... Drainage pump, 113 ... Discharge part, 113a ... Tip, 113a1 ... End face, 113b ... Base end, 113s ... Inner surface, 113t ... Bottom, 113u ... Step part, 113u1 ... Pressure receiving surface.
(First modification of the second embodiment)
2A ... drainage pump, 123 ... discharge part, 123a ... tip, 123a1 ... end face, 123b ... base end, 123s ... inner surface, 123t ... bottom, 123u ... step part, 123u1 ... pressure receiving surface.

Claims

A drainage pump having a housing that houses rotating blades that suck up water when rotated by a motor.
The housing has a main body portion in which a space through which the water flows flows is provided inside, and a tubular discharge portion communicated with the space through an opening provided in a side portion of the main body portion.
The discharge portion is formed so that the central axis of the inner space surrounded by the inner surface is arcuate.
The tip of the discharge portion is arranged at a position higher than the opening so as to face upward.
The portion of the inner surface of the discharge portion from the opening to the tip, which is the farthest from the arc center of the central axis, is composed of a curved surface portion whose position gradually increases from the opening side toward the tip side. A drainage pump that features that.

A drainage pump having a housing that houses rotating blades that suck up water when rotated by a motor.
The housing has a main body portion in which a space through which the water flows flows is provided inside, and a tubular discharge portion communicated with the space through an opening provided in a side portion of the main body portion.
The discharge portion is formed in an L shape having a horizontal pipe connected to the main body portion and a joint pipe connected to the horizontal pipe.
The tip of the discharge portion is arranged at a position higher than the opening so as to face upward.
The entire bottom of the inner surface of the horizontal pipe of the discharge portion is composed of an inclined portion whose position increases linearly from the opening side toward the tip side.
A drainage pump characterized in that a portion formed along the vertical direction on the inner surface of the joint pipe of the discharge portion is connected to the tip end side of the inclined portion.

A drainage pump having a housing that houses rotating blades that suck up water when rotated by a motor.
The housing has a main body portion in which a space through which the water flows flows is provided inside, and a tubular discharge portion communicated with the space through an opening provided in a side portion of the main body portion.
The discharge portion is formed in an L shape having a horizontal pipe connected to the main body portion and a joint pipe connected to the horizontal pipe.
The tip of the discharge portion is arranged at a position higher than the opening so as to face upward.
The bottom of the inner surface of the horizontal pipe of the discharge portion is composed of a horizontal portion having one end connected to the opening.
A die-cutting hole is provided at the tip of the horizontal pipe of the discharge portion, and the die-cutting hole is closed with a cap member.
The cap member has an inclined portion that is continuous with the tip end side of the discharge portion of the horizontal portion and gradually increases in position from the opening side toward the tip end side of the discharge portion.
A drainage pump characterized in that a portion formed along the vertical direction on the inner surface of the joint pipe of the discharge portion is connected to the tip end side of the discharge portion of the inclined portion.

The drainage pump according to claim 1, wherein the inner surface of the discharge portion has a step portion having a pressure receiving surface that receives a pressure generated when water tends to move downward due to gravity.

The drainage pump according to claim 1 , claim 2 or 4 , wherein the end surface of 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.