JP2020122434A - Drain pump rotary vane and drain pump mounted with the same - Google Patents

Drain pump rotary vane and drain pump mounted with the same Download PDF

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JP2020122434A
JP2020122434A JP2019014825A JP2019014825A JP2020122434A JP 2020122434 A JP2020122434 A JP 2020122434A JP 2019014825 A JP2019014825 A JP 2019014825A JP 2019014825 A JP2019014825 A JP 2019014825A JP 2020122434 A JP2020122434 A JP 2020122434A
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blades
diameter
blade
drainage pump
rotary blade
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JP6918367B2 (en
Inventor
克司 佐藤
Katsushi Sato
克司 佐藤
友也 加藤
Tomoya Kato
友也 加藤
雄太 西山
Yuta Nishiyama
雄太 西山
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Fujikoki Corp
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Fujikoki Corp
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Priority to JP2019014825A priority Critical patent/JP6918367B2/en
Priority to KR1020190144926A priority patent/KR20200094620A/en
Priority to CN202010009690.2A priority patent/CN111503046B/en
Publication of JP2020122434A publication Critical patent/JP2020122434A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2216—Shape, geometry
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/24—Vanes
    • F04D29/242—Geometry, shape
    • F04D29/245—Geometry, shape for special effects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/24—Vanes
    • F04D29/242—Geometry, shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • F24F13/222—Means for preventing condensation or evacuating condensate for evacuating condensate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2210/00—Working fluids
    • F05D2210/10—Kind or type
    • F05D2210/11—Kind or type liquid, i.e. incompressible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)

Abstract

To provide a drain pump rotary vane capable of effectively enhance quietness while curbing a reduction in discharge capacity and to provide a drain pump mounted with the same.SOLUTION: In a rotary vane 30 of a drain pump 1, lower portions of a plurality of large diameter blades 33 and a plurality of auxiliary blades 35 are connected through a connection section 36 having an opening 37 at a center thereof. Each of the plurality of large diameter blades 33 has a thin walled portion 38 at a lower portion thereof across the opening 37. Also, each of the plurality of auxiliary blades 35 has a thin walled portion 39 at a lower portion thereof across the opening 37.SELECTED DRAWING: Figure 2

Description

本発明は、例えば、空気調和機の室内ユニット等に用いられる排水ポンプ、および、この排水ポンプが有する排水ポンプ用回転羽根に関する。 The present invention relates to, for example, a drainage pump used in an indoor unit of an air conditioner and the like, and a drainage pump rotary blade included in the drainage pump.

空気調和機の室内ユニットでは、冷房運転時に空気中の水分が凝縮して熱交換器に付着する。熱交換器に付着した水分は水滴となってドレンパンに落下する。そして、ドレンパンに溜まった水（ドレン水）は、排水ポンプによって室内ユニット外部に排出される。このような空気調和機に用いられる排水ポンプの一例が特許文献１に開示されている。 In the indoor unit of the air conditioner, moisture in the air is condensed and adheres to the heat exchanger during the cooling operation. Moisture attached to the heat exchanger drops into the drain pan as water drops. Then, the water (drain water) collected in the drain pan is discharged to the outside of the indoor unit by the drainage pump. Patent Document 1 discloses an example of a drainage pump used in such an air conditioner.

特許文献１の排水ポンプに用いられる回転羽根を図６に示す。図６（ａ）〜（ｃ）は、この回転羽根の斜視図、平面図および正面図である。この回転羽根９３０は、軸部９３１から放射方向に延びる複数の平板状の大径羽根９３３と、大径羽根９３３の下端部に連設される複数の平板状の小径羽根９３４と、隣り合う大径羽根９３３の間に設けられた複数の平板状の補助羽根９３５と、を有している。大径羽根９３３および補助羽根９３５は、それぞれの下端部が中央に開口９３７が設けられた円環状の連結部９３６によって連結されている。大径羽根９３３の回転方向前方を向く水掻き面９３３ａの上端部および外側端部には、各羽根が掻く水を羽根の外側に向けて案内する段部９３３ｂ、９３３ｃが設けられている。補助羽根９３５の水掻き面９３５ａの上端部および外側端部にも同様に段部９３５ｂ、９３５ｃが設けられている。これらの段部によって、振動や騒音を抑制することができる。 The rotary vane used for the drainage pump of Patent Document 1 is shown in FIG. 6A to 6C are a perspective view, a plan view and a front view of the rotary blade. The rotary blade 930 has a plurality of flat plate-shaped large-diameter blades 933 extending in a radial direction from the shaft portion 931 and a plurality of flat-plate-shaped small-diameter blades 934 connected to the lower end portion of the large-diameter blade 933. And a plurality of flat plate-shaped auxiliary blades 935 provided between the radial blades 933. The lower ends of the large-diameter blade 933 and the auxiliary blade 935 are connected by an annular connecting portion 936 having an opening 937 in the center. Steps 933b and 933c for guiding the water scratched by each blade toward the outside of the blade are provided at the upper end and the outer end of the water scraping surface 933a that faces the front in the rotation direction of the large diameter blade 933. Steps 935b and 935c are similarly provided on the upper end and the outer end of the water scraping surface 935a of the auxiliary blade 935. Vibration and noise can be suppressed by these steps.

特開２０１３−６４３９６号公報JP, 2013-64396, A

本発明者らは、回転羽根９３０のさらなる静音性の向上を目指して鋭意検討を行った。その結果、大径羽根９３３が軸部９３１に接続されている一方で補助羽根９３５が軸部９３１に接続されていないことから、小径羽根９３４によって掻き上げられて連結部９３６の開口９３７を通った水について、大径羽根９３３が掻く量に比べて補助羽根９３５が掻く量が少ないことが判明した。図６（ｂ）において、大径羽根９３３が掻く水の流れを矢印ｅ１で模式的に示し、補助羽根９３５が掻く水の流れを矢印ｅ２で模式的に示す。各矢印ｅ１、ｅ２は、線が太いほど掻く水の量が多いことを示す。 The present inventors diligently studied with the aim of further improving the quietness of the rotary blade 930. As a result, since the large diameter blade 933 is connected to the shaft portion 931 and the auxiliary blade 935 is not connected to the shaft portion 931, it is scraped up by the small diameter blade 934 and passed through the opening 937 of the connecting portion 936. It was found that the auxiliary blade 935 scratches less water than the large-diameter blade 933 scratches. In FIG. 6B, the flow of water scratched by the large diameter blade 933 is schematically shown by an arrow e1, and the flow of water scratched by the auxiliary blade 935 is schematically shown by an arrow e2. The arrows e1 and e2 indicate that the thicker the line, the greater the amount of water scratched.

これにより、補助羽根９３５の後側より大径羽根９３３の後側の方が負圧が大きくなる。この負圧の違いによって、大径羽根９３３の外側端部から後側に引き込まれる水の流れ（矢印ｆ２で模式的に示す）が、補助羽根９３５の外側端部から後側に引き込まれる水の流れ（矢印ｆ１で模式的に示す）より径方向内方により大きく引き込まれて、この水の流れの違いによる振動が発生していた。そこで、本発明者らは、補助羽根９３５を径方向内方に延ばして軸部９３１に接続することにより、連結部９３６の開口９３７を通った水について大径羽根９３３が掻く量と補助羽根９３５が掻く量との差を小さくすることで、振動の発生を抑制し、振動に起因する騒音のさらなる低減を実現した。または、補助羽根９３５を、小径羽根９３４が連接された大径羽根９３３に置き換えることでも同様に振動の発生を抑制できる。 As a result, the negative pressure on the rear side of the large diameter blade 933 becomes larger than that on the rear side of the auxiliary blade 935. Due to this difference in negative pressure, the flow of water drawn from the outer end of the large-diameter blade 933 to the rear side (schematically indicated by an arrow f2) changes the water drawn from the outer end of the auxiliary blade 935 to the rear side. The flow was drawn more inward in the radial direction than the flow (schematically indicated by arrow f1), and vibration due to the difference in the flow of water was generated. Therefore, the present inventors extend the auxiliary blade 935 inward in the radial direction and connect it to the shaft portion 931 so that the large blade 933 scratches the water passing through the opening 937 of the connecting portion 936 and the auxiliary blade 935. By reducing the difference from the scratched amount, the generation of vibration was suppressed and the noise caused by vibration was further reduced. Alternatively, by replacing the auxiliary blade 935 with a large-diameter blade 933 in which a small-diameter blade 934 is connected, it is possible to similarly suppress the generation of vibration.

しかしながら、振動や騒音への対策として大径羽根９３３および補助羽根９３５は段部９３３ｂ、９３３ｃおよび段部９３５ｂ、９３５ｃを設けるだけの厚さが必要であるところ、補助羽根９３５を軸部９３１に接続したことにより当該補助羽根９３５が連結部９３６の開口９３７を径方向にまたぐことから当該開口９３７の面積が小さくなる。これにより、小径羽根９３４によって掻き上げられて当該開口９３７を通る水の量が減少してしまい、吐出し能力が低下するという別の問題が生じてしまった。 However, as a countermeasure against vibration and noise, the large-diameter blade 933 and the auxiliary blade 935 need to have a thickness enough to provide the step portions 933b and 933c and the step portions 935b and 935c. Therefore, the auxiliary blade 935 is connected to the shaft portion 931. As a result, the auxiliary blade 935 radially straddles the opening 937 of the connecting portion 936, so that the area of the opening 937 becomes smaller. As a result, the amount of water that is scraped up by the small-diameter blade 934 and passes through the opening 937 is reduced, which causes another problem that the discharge capability is reduced.

そこで、本発明は、吐出し能力の低下を抑制しつつ静音性を効果的に高めることができる排水ポンプ用回転羽根およびそれを有す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 rotary vane for a drainage pump and a drainage pump including the rotary vane, which can effectively reduce noise while suppressing a decrease in discharge capacity.

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用回転羽根は、軸部と、前記軸部から径方向に延びる複数の大径羽根と、前記複数の大径羽根の下端部に連設された複数の小径羽根と、中央に開口が設けられ、前記複数の大径羽根の下端部を連結する連結部と、を有する排水ポンプ用回転羽根であって、前記複数の大径羽根のうち前記開口をまたぐ箇所の少なくとも下端部に薄肉部が設けられていることを特徴とする。 In order to achieve the above object, a rotary vane for a drainage pump according to one aspect of the present invention includes a shaft portion, a plurality of large-diameter blades extending in a radial direction from the shaft portion, and lower end portions of the plurality of large-diameter blades. A rotary vane for a drainage pump, comprising: a plurality of small-diameter blades that are connected to each other; and a connecting portion that has an opening provided in the center and that connects the lower ends of the plurality of large-diameter blades. It is characterized in that a thin portion is provided at least at a lower end portion of the blade over the opening.

本発明において、前記軸部から径方向に延び、隣り合う前記大径羽根の中間に配置された複数の補助羽根をさらに有し、前記連結部が、前記複数の大径羽根の下端部とともに前記複数の補助羽根の下端部も連結し、前記複数の補助羽根のうち前記開口をまたぐ箇所の少なくとも下端部に薄肉部が設けられていることが好ましい。 In the present invention, it further has a plurality of auxiliary blades that extend in the radial direction from the shaft portion and that are arranged in the middle of the adjacent large diameter blades, and the connecting portion is provided with the lower end portions of the plurality of large diameter blades. It is preferable that the lower end portions of the plurality of auxiliary blades are also connected to each other, and a thin portion is provided at least at a lower end portion of the plurality of auxiliary blades across the opening.

本発明において、前記薄肉部が、前記複数の大径羽根の後面を肉盗みすることにより設けられていることが好ましい。 In the present invention, it is preferable that the thin portion is provided by stealing rear surfaces of the plurality of large-diameter blades.

本発明において、前記複数の大径羽根の前面の上端部および外側端部の少なくとも一方に段部が設けられていることが好ましい。 In the present invention, it is preferable that a step portion is provided on at least one of an upper end portion and an outer end portion of a front surface of the plurality of large-diameter blades.

本発明において、前記薄肉部が、前記複数の補助羽根の後面を肉盗みすることにより設けられていることが好ましい。 In the present invention, it is preferable that the thin portion is provided by stealing rear surfaces of the plurality of auxiliary blades.

本発明において、前記複数の補助羽根の前面の上端部および外側端部の少なくとも一方に段部が設けられていることが好ましい。 In the present invention, it is preferable that a step portion is provided on at least one of an upper end portion and an outer end portion of a front surface of the plurality of auxiliary blades.

本発明において、前記複数の小径羽根の前面の外側端部に段部が設けられ、前記複数の小径羽根が、前記複数の大径羽根に対して回転方向前方にずれて配置されていることが好ましい。 In the present invention, a step portion may be provided at an outer end portion of the front surface of the plurality of small diameter blades, and the plurality of small diameter blades may be arranged to be displaced forward in the rotation direction with respect to the plurality of large diameter blades. preferable.

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、下方に向く吸込口を有する吸込管を有するハウジングと、前記ハウジングに収容された回転羽根と、前記回転羽根を回転させるモータと、を有する排水ポンプであって、前記回転羽根が、上記排水ポンプ用回転羽根である。 In order to achieve the above object, a drainage pump according to another aspect of the present invention includes a housing having a suction pipe having a suction port facing downward, a rotary blade housed in the housing, and a rotary blade rotating the rotary blade. A drainage pump having a motor for causing the rotary vane to be the rotary vane for the drainage pump.

本発明によれば、複数の大径羽根は、それぞれの下端部が中央に開口が設けられた連結部によって連結されている。そして、これら複数の大径羽根のうち連結部の開口をまたぐ箇所の少なくとも下端部に薄肉部が設けられている。このようにしたことから、薄肉部を設けることにより複数の大径羽根の下端面の面積が減り、連結部の開口の面積を増やすことができる。これにより、小径羽根によって掻き上げられて連結部の開口を通る水の量の減少を効果的に抑制できる。したがって、吐出し能力の低下を抑制しつつ静音性を効果的に高めることができる。 According to the present invention, the plurality of large-diameter blades are connected at their lower ends by a connecting portion having an opening at the center. Then, a thin portion is provided at least at the lower end portion of the plurality of large-diameter blades that straddles the opening of the connecting portion. By doing so, the area of the lower end surface of the plurality of large-diameter blades is reduced by providing the thin portion, and the area of the opening of the connecting portion can be increased. As a result, it is possible to effectively suppress a decrease in the amount of water that is scraped up by the small-diameter blade and passes through the opening of the connecting portion. Therefore, it is possible to effectively improve the quietness while suppressing the deterioration of the ejection ability.

また、軸部から径方向に延び、隣り合う大径羽根の中間に配置された複数の補助羽根をさらに有し、連結部が、複数の大径羽根の下端部とともに複数の補助羽根の下端部も連結し、複数の補助羽根のうち開口をまたぐ箇所の少なくとも下端部に薄肉部が設けられていてもよい。このようにすることで、薄肉部を設けることにより複数の補助羽根の下端面の面積が減り、連結部の開口の面積を増やすことができる。これにより、小径羽根によって掻き上げられて連結部の開口を通る水の量の減少を効果的に抑制できる。したがって、吐出し能力の低下を抑制しつつ静音性を効果的に高めることができる。 Further, it further has a plurality of auxiliary blades extending in the radial direction from the shaft portion and arranged in the middle of the adjacent large-diameter blades, and the connecting portion, together with the lower end portions of the large-diameter blades, the lower end portions of the plurality of auxiliary blades. Also, a thin portion may be provided at least at the lower end of a portion of the plurality of auxiliary blades that straddles the opening. By doing so, the area of the lower end surfaces of the plurality of auxiliary blades is reduced by providing the thin portion, and the area of the opening of the connecting portion can be increased. As a result, it is possible to effectively suppress a decrease in the amount of water that is scraped up by the small-diameter blade and passes through the opening of the connecting portion. Therefore, it is possible to effectively improve the quietness while suppressing the decrease in the ejection ability.

また、複数の小径羽根の前面の外側端部に段部が設けられ、複数の小径羽根が、複数の大径羽根に対して回転方向前方にずれて配置されていてもよい。このようにすることで、段部を設けることにより厚さが小さく（薄く）なった小径羽根の外側端部を大径羽根の下端面における前面寄りの箇所に配置することができる。これにより、大径羽根の後面を軸部により近い箇所まで肉盗みして薄肉部を設けることができ、連結部の開口の面積をさらに増やすことができる。 Further, a step portion may be provided at the outer end portion of the front surface of the plurality of small diameter blades, and the plurality of small diameter blades may be arranged to be displaced forward in the rotation direction with respect to the plurality of large diameter blades. By doing so, it is possible to dispose the outer end portion of the small-diameter blade whose thickness is reduced (thinned) by providing the step portion at a position closer to the front surface on the lower end surface of the large-diameter blade. As a result, the rear surface of the large-diameter blade can be stolen to a position closer to the shaft portion to provide a thin portion, and the area of the opening of the connecting portion can be further increased.

本発明の第１実施例に係る排水ポンプを示す図である。It is a figure which shows the drainage pump which concerns on 1st Example of this invention. 図１の排水ポンプに用いられる回転羽根を示す図である。It is a figure which shows the rotary blade used for the drainage pump of FIG. 図２の回転羽根の断面図である。It is sectional drawing of the rotary blade of FIG. 図２の回転羽根の底面図である。It is a bottom view of the rotary blade of FIG. 図２の回転羽根の変形例の構成を示す図である。It is a figure which shows the structure of the modification of the rotary blade of FIG. 従来の排水ポンプに用いられる回転羽根を示す図である。It is a figure which shows the rotary blade used for the conventional drainage pump.

以下、本発明の実施例に係る排水ポンプの構成について図１〜図５を参照して説明する。本実施例の排水ポンプは、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。 Hereinafter, the configuration of the drainage pump according to the embodiment of the present invention will be described with reference to FIGS. 1 to 5. The drainage pump of the present embodiment is, for example, for discharging drain water collected in a drain pan of an indoor unit of an air conditioner to the outside. Of course, the use of this drainage pump is not limited to drainage water discharge, and can be used for discharge of various liquids and pumping up.

図１は、本発明の実施例に係る排水ポンプを示す図であり、具体的には、排水ポンプの下部について吐出管の軸線を通る面で切断した部分断面図を含む正面図である。図２は、図１の排水ポンプに用いられる回転羽根を示す図であり、（ａ）〜（ｃ）は、順に斜視図、平面図および正面図である。図３は、図２の回転羽根の断面図であり、具体的には、図２（ｂ）のＡ−Ａ線に沿う断面図である。図４（ａ）は図２の回転羽根の底面図であり、図４（ｂ）は図４（ａ）の小径羽根近傍を拡大した底面図である。図５は、図２の回転羽根の変形例の構成を示す図であり、（ａ）は回転羽根の底面図であり、（ｂ）は図５（ａ）の小径羽根近傍を拡大した底面図である。 FIG. 1 is a diagram showing a drainage pump according to an embodiment of the present invention, and specifically, is a front view including a partial cross-sectional view of a lower portion of the drainage pump taken along a plane passing through an axis of a discharge pipe. FIG. 2 is a diagram showing a rotary blade used in the drainage pump of FIG. 1, and (a) to (c) are a perspective view, a plan view, and a front view, respectively. FIG. 3 is a cross-sectional view of the rotary blade of FIG. 2, specifically, a cross-sectional view taken along the line AA of FIG. 4A is a bottom view of the rotary blade of FIG. 2, and FIG. 4B is an enlarged bottom view of the vicinity of the small diameter blade of FIG. 4A. 5: is a figure which shows the structure of the modification of the rotary blade of FIG. 2, (a) is a bottom view of a rotary blade, (b) is the bottom view which expanded the small diameter blade vicinity of FIG. 5(a). Is.

図１に示すように、本実施例の排水ポンプ１は、ハウジング１０と、カバー２０と、排水ポンプ用回転羽根である回転羽根３０と、モータ４０と、を有している。本実施例において、ハウジング１０、カバー２０および回転羽根３０は、合成樹脂製である。 As shown in FIG. 1, the drainage pump 1 of this embodiment includes a housing 10, a cover 20, a rotary vane 30 that is a rotary vane for a drainage pump, and a motor 40. In this embodiment, the housing 10, the cover 20 and the rotary vanes 30 are made of synthetic resin.

ハウジング１０は、本体部１１と、吸込管１６と、吐出管１８とを一体に有している。本体部１１は、逆円錐台形状を有する底壁部１２と、底壁部１２の外周縁に連設された周壁部１３と、を有している。吸込管１６は、底壁部１２の中心から下方に延びている。吸込管１６の下端には、下方に向く吸込口１７が設けられている。吐出管１８は、周壁部１３から側方（図１の右方向）に延びている。吐出管１８の先端には、側方を向く吐出口１９が設けられている。本体部１１の周壁部１３には、吐出管１８への入口となる吐出管入口１５が設けられている。 The housing 10 integrally has a main body 11, a suction pipe 16, and a discharge pipe 18. The main body portion 11 has a bottom wall portion 12 having an inverted truncated cone shape, and a peripheral wall portion 13 continuously provided on the outer peripheral edge of the bottom wall portion 12. The suction pipe 16 extends downward from the center of the bottom wall portion 12. A suction port 17 facing downward is provided at the lower end of the suction pipe 16. The discharge pipe 18 extends laterally (rightward in FIG. 1) from the peripheral wall portion 13. A discharge port 19 that faces the side is provided at the tip of the discharge pipe 18. The peripheral wall portion 13 of the main body portion 11 is provided with a discharge pipe inlet 15 which is an inlet to the discharge pipe 18.

ハウジング１０は、その内側に後述する回転羽根３０が配置される空間を有しており、当該空間をカバー２０とともに囲むことでポンプ室２５を形成している。 The housing 10 has a space inside which a rotary vane 30 described later is arranged, and the pump chamber 25 is formed by surrounding the space with the cover 20.

カバー２０は、略円筒形状を有し、その下端部がハウジング１０の本体部１１の周壁部１３と嵌合されて、図示しない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を介してブラケット２２が取り付けられている。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。カバー２０には、回転羽根３０を回転させるモータ４０が収容されている。 The cover 20 has a substantially cylindrical shape, and a lower end portion of the cover 20 is fitted to the peripheral wall portion 13 of the main body portion 11 of the housing 10, and is fixedly attached to the housing 10 by a snap fit mechanism (not shown). A bracket 22 is attached to the upper end of the cover 20 via a locking portion 21. The bracket 22 is provided with a mounting portion 23 for mounting the drainage pump 1 to another device. A motor 40 for rotating the rotary blade 30 is housed in the cover 20.

回転羽根３０は、ポンプ室２５に回転可能に収容されている。回転羽根３０は、図２〜図４に示すように、軸部３１と、複数の大径羽根３３と、複数の小径羽根３４と、複数の補助羽根３５と、を有している。また、回転羽根３０は、逆円錐台形状を有し、中央に開口３７が設けられた円環状の連結部３６を有している。連結部３６は、軸部３１と同軸に配置される。本実施例において、回転羽根３０は、大径羽根３３、小径羽根３４および補助羽根３５が同じ厚さの平板状に形成されており、それぞれを４枚ずつ有している。回転羽根３０は、図２（ｂ）において軸部３１を中心に反時計方向に回転され、図４において時計方向に回転される。 The rotary blade 30 is rotatably housed in the pump chamber 25. As shown in FIGS. 2 to 4, the rotary blade 30 has a shaft portion 31, a plurality of large diameter blades 33, a plurality of small diameter blades 34, and a plurality of auxiliary blades 35. Further, the rotary blade 30 has an inverted truncated cone shape and has an annular connecting portion 36 having an opening 37 in the center. The connecting portion 36 is arranged coaxially with the shaft portion 31. In the present embodiment, the rotary blade 30 has a large-diameter blade 33, a small-diameter blade 34, and an auxiliary blade 35 formed in a flat plate shape having the same thickness, and each has four blades. The rotary blade 30 is rotated counterclockwise about the shaft portion 31 in FIG. 2B, and is rotated clockwise in FIG.

軸部３１は、円柱状に形成されており、カバー２０の中央に設けられた貫通孔２４に通されている。軸部３１の上端部には取付穴３２が設けられている。取付穴３２は、モータ４０の駆動軸４１が嵌合されている。 The shaft portion 31 is formed in a cylindrical shape and is passed through a through hole 24 provided in the center of the cover 20. A mounting hole 32 is provided at the upper end of the shaft portion 31. The drive shaft 41 of the motor 40 is fitted into the mounting hole 32.

複数の大径羽根３３は、軸部３１の外周面から放射方向（径方向外方）に延びている。複数の大径羽根３３は、下端部が連結部３６によって互いに連結されており、軸部３１を中心に等角度間隔（本実施例においては９０度間隔）で配置されている。複数の大径羽根３３は、回転方向前方を向く前面である水掻き面３３ａの上端部および径方向外方寄りの端部である外側端部に階段状の段部３３ｂ、３３ｃが設けられている。段部３３ｂは、ドレン水を上方に撥ね上げて外方に案内する作用を奏する。段部３３ｃは、ドレン水を径方向外方に案内する作用を奏する。これらの段部３３ｂ、３３ｃの相乗作用によって、水の気液境界面の位置がより外側に膨らんで大径羽根３３の外側端部にかかる程度になるので、振動と騒音を抑制することができる。これら段部３３ｂ、３３ｃは、少なくとも一方が設けられていることが好ましいが、段部３３ｂ、３３ｃを省略した構成でもよい。 The plurality of large-diameter blades 33 extend in the radial direction (outward in the radial direction) from the outer peripheral surface of the shaft portion 31. The lower ends of the plurality of large-diameter blades 33 are connected to each other by a connecting portion 36, and the large-sized blades 33 are arranged at equal angular intervals (90° intervals in this embodiment) about the shaft 31. The plurality of large-diameter blades 33 are provided with stair-like step portions 33b and 33c at the upper end portion of the water scraping surface 33a, which is the front surface facing forward in the rotation direction, and the outer end portion, which is the end portion radially outward. .. The step portion 33b has a function of splashing drain water upward and guiding it outward. The step portion 33c has a function of guiding the drain water outward in the radial direction. Due to the synergistic action of these stepped portions 33b and 33c, the position of the gas-liquid boundary surface of water swells further outward and reaches the outer end portion of the large-diameter blade 33, so that vibration and noise can be suppressed. .. At least one of the step portions 33b and 33c is preferably provided, but the step portions 33b and 33c may be omitted.

複数の大径羽根３３の下端部における連結部３６の開口３７をまたぐ箇所には、薄肉部３８が設けられている。この薄肉部３８は、大径羽根３３の回転方向後方を向く後面３３ｄを肉盗みすることにより設けられている。薄肉部３８を設けることにより大径羽根３３の下端面３３ｅの面積が減る。そのため、連結部３６の開口３７の面積を増やすことができる。なお、薄肉部３８は、水掻き面３３ａを肉盗みすることにより設けることも可能であるが、大径羽根３３が掻く水の流れに乱れを生じさせるおそれがあるため、後面３３ｄを肉盗みして薄肉部３８を設けることが好ましい。 A thin portion 38 is provided at a lower end portion of the plurality of large-diameter blades 33 at a position across the opening 37 of the connecting portion 36. The thin portion 38 is provided by stealing the rear surface 33d facing rearward in the rotation direction of the large-diameter blade 33. By providing the thin portion 38, the area of the lower end surface 33e of the large diameter blade 33 is reduced. Therefore, the area of the opening 37 of the connecting portion 36 can be increased. The thin portion 38 may be provided by stealing the water scraping surface 33a, but since the large-diameter blade 33 may disturb the flow of water, the rear surface 33d should be stolen. It is preferable to provide the thin portion 38.

複数の小径羽根３４は、各大径羽根３３の下端部における軸部３１寄りの部分に連設されており下方に延びている。複数の小径羽根３４は、吸込管１６に挿入されている。複数の小径羽根３４は、軸部３１を中心に等角度間隔（本実施例においては９０度間隔）で配置されている。各小径羽根３４における回転方向前方を向く前面である水掻き面３４ａの外側端部３４ｆには階段状の段部３４ｃが設けられている。 The plurality of small-diameter blades 34 are connected to the lower end portion of each large-diameter blade 33 near the shaft portion 31 and extend downward. The plurality of small-diameter blades 34 are inserted in the suction pipe 16. The plurality of small-diameter blades 34 are arranged at equal angular intervals (90° intervals in the present embodiment) around the shaft portion 31. A stair-like stepped portion 34c is provided at an outer end portion 34f of the water scraping surface 34a, which is a front surface of each small-diameter blade 34 facing forward in the rotation direction.

複数の小径羽根３４は、図４に示すように、複数の大径羽根３３に対して回転方向前方にずれて配置されている。すなわち、大径羽根３３と小径羽根３４とがなす角度θが０より大きい（θ＞０）。図４（ｂ）において、線Ｓは、下方から見たときの一の大径羽根３３の延在方向を示す線であり、線Ｔは、下方から見たときの当該一の大径羽根３３に連接された一の小径羽根３４の延在方向を示す線である。このようにすることで、段部３４ｃを設けることにより厚さが小さく（薄く）なった小径羽根３４の外側端部３４ｆを、大径羽根３３の下端面３３ｅにおける水掻き面３３ａ寄りの箇所に配置することができる。これにより、小径羽根３４を径方向に小さくすることなく、大径羽根３３の後面３３ｄを軸部３１により近い箇所まで肉盗みして薄肉部３８を設けることができ、連結部３６の開口３７の面積をさらに増やすことができる。なお、図５に示す回転羽根３０Ａのように、大径羽根３３と小径羽根３４とが回転方向にずれていない構成（すなわち線Ｓと線Ｔとが一致する構成、θ＝０）を採用してもよい。 As shown in FIG. 4, the plurality of small-diameter blades 34 are arranged so as to be displaced forward in the rotational direction with respect to the plurality of large-diameter blades 33. That is, the angle θ formed by the large diameter blade 33 and the small diameter blade 34 is larger than 0 (θ>0). In FIG. 4B, a line S is a line indicating the extending direction of the one large diameter blade 33 when viewed from below, and a line T is the one large diameter blade 33 when viewed from below. Is a line showing the extending direction of the one small-diameter blade 34 connected to. By doing so, the outer end portion 34f of the small-diameter blade 34, which is reduced in thickness (thinned) by providing the step portion 34c, is arranged at a position on the lower end surface 33e of the large-diameter blade 33 near the water scraping surface 33a. can do. Accordingly, without thinning the small-diameter blade 34 in the radial direction, the rear surface 33d of the large-diameter blade 33 can be stolen up to a position closer to the shaft portion 31 to provide the thin-walled portion 38, and the opening 37 of the connecting portion 36 can be provided. The area can be further increased. In addition, like the rotary blade 30A shown in FIG. 5, a configuration in which the large-diameter blade 33 and the small-diameter blade 34 are not displaced in the rotation direction (that is, the configuration in which the line S and the line T match, θ=0) is adopted. May be.

複数の補助羽根３５は、複数の大径羽根３３と同様に、軸部３１の外周面から放射方向（径方向外方）に延びている。複数の補助羽根３５は、複数の大径羽根３３とともに下端部が連結部３６によって連結されており、回転方向に隣り合う大径羽根３３の中間に配置されている。複数の補助羽根３５の下端部には、小径羽根３４が連設されていない。複数の補助羽根３５は、回転方向前方を向く前面である水掻き面３５ａの上端部および外側端部に階段状の段部３５ｂ、３５ｃが設けられている。これら段部３５ｂ、３５ｃは、大径羽根３３の段部３３ｂ、３３ｃと同様の作用効果を奏する。これら段部３５ｂ、３５ｃは、少なくとも一方が設けられていることが好ましいが、段部３５ｂ、３５ｃを省略した構成でもよい。 The plurality of auxiliary blades 35, similarly to the plurality of large-diameter blades 33, extend in the radial direction (outward in the radial direction) from the outer peripheral surface of the shaft portion 31. The plurality of auxiliary blades 35 are connected to the plurality of large-diameter blades 33 at their lower ends by a connecting portion 36, and are arranged in the middle of the large-diameter blades 33 that are adjacent in the rotation direction. The small-diameter blades 34 are not connected to the lower ends of the plurality of auxiliary blades 35. The plurality of auxiliary blades 35 are provided with stepwise step portions 35b and 35c at the upper end portion and the outer end portion of the water scraping surface 35a which is the front surface facing forward in the rotation direction. These step portions 35b and 35c have the same operational effects as the step portions 33b and 33c of the large diameter blade 33. It is preferable that at least one of the step portions 35b and 35c is provided, but the step portions 35b and 35c may be omitted.

複数の補助羽根３５の下端部における連結部３６の開口３７をまたぐ箇所には、薄肉部３９が設けられている。この薄肉部３９は、補助羽根３５の回転方向後方を向く後面３５ｄを肉盗みすることにより設けられている。薄肉部３９を設けることにより補助羽根３５の下端面３５ｅの面積が減る。そのため、連結部３６の開口３７の面積を増やすことができる。なお、薄肉部３９は、水掻き面３５ａを肉盗みすることにより設けることも可能であるが、補助羽根３５が掻く水の流れの乱れを生じさせるおそれがあるため、後面３５ｄを肉盗みすることが好ましい。 A thin-walled portion 39 is provided at a lower end portion of the plurality of auxiliary blades 35 at a position straddling the opening 37 of the connecting portion 36. The thin portion 39 is provided by stealing the rear surface 35d of the auxiliary blade 35 that faces the rear in the rotation direction. By providing the thin portion 39, the area of the lower end surface 35e of the auxiliary blade 35 is reduced. Therefore, the area of the opening 37 of the connecting portion 36 can be increased. Although the thin portion 39 can be provided by stealing the water scraping surface 35a, the rear surface 35d may be stolen because the auxiliary blade 35 may disturb the flow of water. preferable.

以上より、本実施例の排水ポンプ１によれば、複数の大径羽根３３および複数の補助羽根３５は、それぞれの下端部が中央に開口３７が設けられた連結部３６によって連結されている。そして、複数の大径羽根３３の下端部における開口３７をまたぐ箇所に薄肉部３８が設けられ、複数の補助羽根３５の下端部における開口３７をまたぐ箇所に薄肉部３９が設けられている。このようにしたことから、薄肉部３８および薄肉部３９を設けることにより複数の大径羽根３３の下端面３３ｅおよび複数の補助羽根３５の下端面３５ｅの面積が減り、その分、連結部３６の開口３７の面積を増やすことができる。これにより、小径羽根３４によって掻き上げられて連結部３６の開口３７を通る水の量の減少を効果的に抑制できる。したがって、吐出し能力の低下を抑制しつつ静音性を効果的に高めることができる。 As described above, according to the drainage pump 1 of the present embodiment, the plurality of large-diameter blades 33 and the plurality of auxiliary blades 35 are connected at their lower end portions by the connecting portion 36 having the opening 37 at the center. A thin portion 38 is provided at a lower end portion of the plurality of large-diameter blades 33 at a portion straddling the opening 37, and a thin portion 39 is provided at a lower end portion of the plurality of auxiliary blades 35 at a portion straddling the opening 37. From this, by providing the thin portion 38 and the thin portion 39, the areas of the lower end surfaces 33e of the plurality of large-diameter blades 33 and the lower end surfaces 35e of the plurality of auxiliary blades 35 are reduced, and the connecting portion 36 is correspondingly reduced. The area of the opening 37 can be increased. As a result, it is possible to effectively suppress a decrease in the amount of water that is scraped up by the small-diameter blade 34 and passes through the opening 37 of the connecting portion 36. Therefore, it is possible to effectively improve the quietness while suppressing the deterioration of the ejection ability.

上述した実施例では、隣り合う大径羽根３３の中間に補助羽根３５を設けた構成であったが、補助羽根３５を、小径羽根３４が下端部に連接された大径羽根３３に置き換えた構成を採用してもよい。この構成においても、上記実施例と同様の作用効果を奏する。 In the above-described embodiment, the auxiliary blade 35 is provided between the adjacent large-diameter blades 33, but the auxiliary blade 35 is replaced with the large-diameter blade 33 in which the small-diameter blade 34 is connected to the lower end. May be adopted. Also in this configuration, the same operational effect as that of the above-described embodiment is obtained.

上記に本発明の実施例を説明したが、本発明はこれらの例に限定されるものではない。上記の実施例に対して、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、実施例の特徴を適宜組み合わせたものも、本発明の趣旨に反しない限り、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. Those skilled in the art may appropriately add or delete components, change the design, or appropriately combine the features of the embodiments with respect to the embodiments described above, as long as they do not violate the spirit of the invention. It is included in the range of.

１…排水ポンプ、１０…ハウジング、１１…本体部、１２…底壁部、１３…周壁部、１５…吐出管入口、１６…吸込管、１７…吸込口、１８…吐出管、１９…吐出口、２０…カバー、２１…係止部、２２…ブラケット、２３…取付部、２４…貫通孔、２５…ポンプ室、３０…回転羽根、３１…軸部、３２…取付穴、３３…大径羽根、３３ａ…水掻き面、３３ｂ…段部、３３ｃ…段部、３３ｄ…後面、３３ｅ…下端面、３４…小径羽根、３４ａ…水掻き面、３４ｃ…段部、３４ｆ…外側端部、３５…補助羽根、３５ａ…水掻き面、３５ｂ…段部、３５ｃ…段部、３５ｄ…後面、３５ｅ…下端面、３６…連結部、３７…開口、３８…薄肉部、３９…薄肉部、４０…モータ、４１…駆動軸 DESCRIPTION OF SYMBOLS 1... Drain pump, 10... Housing, 11... Main body part, 12... Bottom wall part, 13... Peripheral wall part, 15... Discharge pipe inlet, 16... Suction pipe, 17... Suction port, 18... Discharge pipe, 19... Discharge port , 20... Cover, 21... Locking part, 22... Bracket, 23... Mounting part, 24... Through hole, 25... Pump chamber, 30... Rotating blade, 31... Shaft part, 32... Mounting hole, 33... Large diameter blade , 33a... Water scraping surface, 33b... Step, 33c... Step, 33d... Rear surface, 33e... Bottom surface, 34... Small blade, 34a... Water scraping surface, 34c... Step, 34f... Outer end, 35... Auxiliary blade , 35a... Water scraping surface, 35b... Step portion, 35c... Step portion, 35d... Rear surface, 35e... Lower end surface, 36... Connecting portion, 37... Opening, 38... Thin portion, 39... Thin portion, 40... Motor, 41... Drive shaft

Claims (8)

軸部と、前記軸部から径方向に延びる複数の大径羽根と、前記複数の大径羽根の下端部に連設された複数の小径羽根と、中央に開口が設けられ、前記複数の大径羽根の下端部を連結する連結部と、を有する排水ポンプ用回転羽根であって、
前記複数の大径羽根のうち前記開口をまたぐ箇所の少なくとも下端部に薄肉部が設けられていることを特徴とする排水ポンプ用回転羽根。 A shaft portion, a plurality of large-diameter blades extending in the radial direction from the shaft portion, a plurality of small-diameter blades connected to the lower end portions of the plurality of large-diameter blades, an opening provided in the center, the plurality of large-diameter blades. A rotary vane for a drainage pump, comprising: a connecting portion that connects the lower ends of the radial blades,
A rotary blade for a drainage pump, wherein a thin portion is provided at least at a lower end portion of a portion of the plurality of large-diameter blades that straddles the opening. 前記軸部から径方向に延び、隣り合う前記大径羽根の中間に配置された複数の補助羽根をさらに有し、
前記連結部が、前記複数の大径羽根の下端部とともに前記複数の補助羽根の下端部も連結し、
前記複数の補助羽根のうち前記開口をまたぐ箇所の少なくとも下端部に薄肉部が設けられている、請求項１に記載の排水ポンプ用回転羽根。 Extending from the shaft portion in the radial direction, further having a plurality of auxiliary blades arranged in the middle of the adjacent large-diameter blades,
The connecting portion also connects the lower end portions of the plurality of large-diameter blades together with the lower end portions of the plurality of auxiliary blades,
The rotary blade for a drainage pump according to claim 1, wherein a thin portion is provided at least at a lower end portion of the plurality of auxiliary blades across the opening. 前記薄肉部が、前記複数の大径羽根の後面を肉盗みすることにより設けられている、請求項１に記載の排水ポンプ用回転羽根。 The rotary blade for a drainage pump according to claim 1, wherein the thin portion is provided by stealing rear surfaces of the plurality of large-diameter blades. 前記複数の大径羽根の前面の上端部および外側端部の少なくとも一方に段部が設けられている、請求項３に記載の排水ポンプ用回転羽根。 The rotary blade for a drainage pump according to claim 3, wherein a step portion is provided on at least one of an upper end portion and an outer end portion of a front surface of the plurality of large-diameter blades. 前記薄肉部が、前記複数の補助羽根の後面を肉盗みすることにより設けられている、請求項２に記載の排水ポンプ用回転羽根。 The rotary blade for a drainage pump according to claim 2, wherein the thin portion is provided by stealing rear surfaces of the plurality of auxiliary blades. 前記複数の補助羽根の前面の上端部および外側端部の少なくとも一方に段部が設けられている、請求項５に記載の排水ポンプ用回転羽根。 The rotary vane for a drainage pump according to claim 5, wherein a step portion is provided on at least one of an upper end portion and an outer end portion of a front surface of the plurality of auxiliary blades. 前記複数の小径羽根の前面の外側端部に段部が設けられ、
前記複数の小径羽根が、前記複数の大径羽根に対して回転方向前方にずれて配置されている、請求項３または請求項４に記載の排水ポンプ用回転羽根。 Steps are provided at the outer ends of the front surfaces of the plurality of small-diameter blades,
The rotary vane for a drainage pump according to claim 3 or 4, wherein the plurality of small-diameter vanes are arranged so as to be displaced forward in the rotational direction with respect to the plurality of large-diameter vanes. 下方に向く吸込口を有する吸込管を有するハウジングと、前記ハウジングに収容された回転羽根と、前記回転羽根を回転させるモータと、を有する排水ポンプであって、
前記回転羽根が、請求項１〜請求項７のいずれか一項に記載の排水ポンプ用回転羽根である、排水ポンプ。 A drainage pump comprising: a housing having a suction pipe having a suction port facing downward; a rotary blade housed in the housing; and a motor for rotating the rotary blade,
A drainage pump, wherein the rotary blade is the rotary blade for a drainage pump according to any one of claims 1 to 7.
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JPH05312187A (en) * 1992-05-07 1993-11-22 Matsushita Electric Ind Co Ltd Centrifugal pump
JPH08326694A (en) * 1995-05-30 1996-12-10 Toto Ltd Centrifugal fan with blade
JP2003293976A (en) * 2002-04-08 2003-10-15 Taisan Kogyo Kk Drain pump
JP2004060463A (en) * 2002-07-25 2004-02-26 Taisan Kogyo Kk Drainage pump
JP2004245055A (en) * 2003-02-10 2004-09-02 Saginomiya Seisakusho Inc Discharge pump and air conditioner equipped with the same
JP2007085268A (en) * 2005-09-22 2007-04-05 Fuji Koki Corp Drainage pump
JP2013064396A (en) * 2011-08-30 2013-04-11 Fuji Koki Corp Drain pump
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