EP4534851A1 - Drain pump - Google Patents

Drain pump Download PDF

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Publication number
EP4534851A1
EP4534851A1 EP23815755.6A EP23815755A EP4534851A1 EP 4534851 A1 EP4534851 A1 EP 4534851A1 EP 23815755 A EP23815755 A EP 23815755A EP 4534851 A1 EP4534851 A1 EP 4534851A1
Authority
EP
European Patent Office
Prior art keywords
axial direction
housing
peripheral face
face
cover
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23815755.6A
Other languages
German (de)
English (en)
French (fr)
Inventor
Yuya Touke
Yoshiki Watanabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujikoki Corp
Original Assignee
Fujikoki Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujikoki Corp filed Critical Fujikoki Corp
Publication of EP4534851A1 publication Critical patent/EP4534851A1/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps
    • 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
    • F04D29/08—Sealings
    • F04D29/086—Sealings especially adapted for liquid pumps
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps

Definitions

  • a structure in which a rotary impeller, for sucking up water by being rotated by a motor and externally discharging the water, is housed in a pump chamber, and the pump chamber is configured by a cover and housing being joined together by a snap fitting (see Japanese Patent Application Laid-Open ( JP-A) Nos. 2010-275972 and 2013-167234 ). Waterproofing between the cover and the housing is secured by a seal component (O-ring).
  • a seal component O-ring
  • a drain pump includes a rotary impeller, a cover, a housing that together with the cover configures a pump chamber to house the rotary impeller, and that is joined in an axial direction of the rotary impeller to the cover by a snap fitting, a ring-shaped seal component, and a seating section that is disposed further out than the pump chamber in a radial direction of the rotary impeller, that is configured from the cover and the housing, and that seats the ring-shaped seal component.
  • the seating section includes a pressing section that presses the seal component in the axial direction and the radial direction.
  • a third aspect is the drain pump according to the first aspect, wherein the pressing section is provided over all circumferential direction regions around a rotation direction of the rotary impeller.
  • An eighth aspect is the drain pump according to any one of the first aspect to the third aspect, wherein the portion of the cover configuring the pressing section includes an outer peripheral face along the axial direction, and a lower face intersecting with the axial direction, the portion of the housing configuring the pressing section includes an inner peripheral face having an axial direction dimension smaller than the outer peripheral face along the axial direction, and an upper face intersecting with the axial direction, the seal component is abutted against the outer peripheral face, the lower face, the inner peripheral face, and the upper face, and a space to accommodate deformation of the seal component due to thermal expansion is provided between the cover and the housing.
  • the motor 16 configured from a stator, a rotor, and the like is installed to an upper portion of the lower cover 20.
  • a lead-wire pull-out section 24 for leading lead-wires out from the motor 16 is exposed at the outside.
  • a drive shaft of the motor 16 is coupled to a rotation shaft of the rotary impeller 51 disposed inside a pump chamber 21.
  • a hole is formed in a bottom portion of the lower cover 20 for placement of a transmission member for transmitting rotation of the motor 16 to the rotary impeller 51 therein.
  • the seating section 40 is configured by the housing 12 and the lower cover 20 at the outside of the pump chamber 21 in the radial direction of the rotary impeller 51, and is a site for seating the O-ring 14.
  • the seating section 40 is, for example, provided to an spigot section that is a site provided with an spigot structure.
  • the seating section 40 includes, for example, the circular cylinder portion 41 and periphery thereof provided to one of the lower face 20B of the lower cover 20 or an upper face 12B of the housing 12, and the ring-shaped recessed portion 42 provided to the other thereof and seating part or all of the circular cylinder portion 41.
  • the circular cylinder portion 41 is formed to the lower face 20B of the lower cover 20, and the recessed portion 42 is formed to the upper face 12B of the housing 12.
  • the recessed portion 42 may be configured by an upper edge portion of the housing 12 and a space at the inside thereof. In a state in which the lower cover 20 is assembled to the housing 12, the circular cylinder portion 41 of the lower cover 20 is placed at the inside of the upper edge portion serving as the recessed portion 42 of the housing 12.
  • the upper face 12B of the housing 12 is a face facing the lower cover 20 in the axial direction X of the motor 16.
  • the seating section 40 pressing the O-ring 14 in the radial direction R over all circumferential direction regions around the rotation direction of the rotary impeller 51 in this manner, waterproofing is performed by the O-ring 14 between the housing 12 and the lower cover 20.
  • the seating section 40 presses the O-ring 14 in the axial direction X at least at three locations in the circumferential direction.
  • the seating section 40 may be configured as a pressing section over all circumferential direction regions around the rotation direction of the rotary impeller 51.
  • the seating section 40 is configured as a pressing section over all circumferential direction regions around the rotation direction of the rotary impeller 51.
  • a portion of the lower cover 20 configuring the seating section 40 includes, as an example of a pressing section, an outer peripheral face 20A of the circular cylinder portion 41 and a lower face 20B intersecting with the axial direction X.
  • the outer peripheral face 20A is, for example, a face along the axial direction X.
  • the outer peripheral face 20A is, for example, parallel to the axial direction X.
  • the outer peripheral face 20A and the lower face 20B are orthogonal.
  • the lower face 20B of the lower cover 20 is a face facing the housing 12 along the axial direction X of the motor 16.
  • a portion configuring the seating section 40 of the housing 12 includes, as an example of a pressing section, an inner conical surface 12C facing the outer peripheral face 20A and the lower face 20B of the lower cover 20.
  • the inner conical surface 12C is an inner peripheral face of the recessed portion 42, and is contiguous for one cycle in the circumferential direction around the rotation direction of the rotary impeller 51.
  • the inner conical surface 12C configures part of the recessed portion 42.
  • the O-ring 14 is abutted against the outer peripheral face 20A and the lower face 20B of the lower cover 20, and against the inner conical surface 12C of the housing 12.
  • a reaction force F1 from the O-ring 14 acts on the inner conical surface 12C of the housing 12.
  • the reaction force F1 can be analyzed as being a component force F1x in the axial direction X, and a component force F1r in the radial direction R. Namely, a reaction force from the O-ring 14 acts on the housing 12 in both the axial direction X and the radial direction R.
  • the O-ring 14 is thereby sandwiched respectively pressed by the lower cover 20 and the housing 12 in both the axial direction X and the radial direction R.
  • a gap S is formed between the lower cover 20 and the housing 12. Due to the gap S being formed to this portion, a gap in the axial direction X is reduced between the snap fitting arms 22A and the engaged portions 22B in the snap fitting 22 (see Fig. 1 ).
  • a reaction force F1r in the radial direction R from the O-ring 14 acts on the inner peripheral face 12A of the housing 12.
  • a reaction force F1x in the axial direction X from the O-ring 14 acts on the upper face 12B of the housing 12. Namely, a reaction force from the O-ring 14 acts on the lower cover 20 in both the axial direction X and the radial direction R.
  • the O-ring 14 is sandwiched respectively pressed by the lower cover 20 and the housing 12 in the axial direction X and the radial direction R.
  • Fig. 5 illustrates a third exemplary embodiment of a drain pump 2.
  • the seating section 40 is configured as a pressing section over all circumferential direction regions around the rotation direction of the rotary impeller 51, and presses the O-ring 14 in the axial direction X and the radial direction R over all circumferential direction regions.
  • the O-ring 14 is abutted against the outer conical surface 20C of the lower cover 20 and inner conical surface 12C of the housing 12, and relative movement between the lower cover 20 and the housing 12 is accordingly suppressed in both the axial direction X and the radial direction R. This means that even if vibration develops due to rotation of the motor 16, contact noise is suppressed from being generated from these portions of the snap fitting 22.
  • a reaction force F2r in the radial direction R from the O-ring 14 acts on the outer peripheral face 20A of the lower cover 20.
  • a reaction force F2x in the axial direction X from the O-ring 14 acts on the lower face 20B of the lower cover 20.
  • a reaction force from the O-ring 14 acts on the lower cover 20 in both the axial direction X and the radial direction R. In this manner, the O-ring 14 is sandwiched respectively pressed by the lower cover 20 and the housing 12 in the axial direction X and the radial direction R.
  • a space 32 accommodating deformation of the O-ring 14 is provided between the lower cover 20 and the housing 12.
  • Fig. 8 illustrates a sixth exemplary embodiment of a drain pump 2.
  • the housing 12 and the lower cover 20 have an spigot structure, with the circular cylinder portion 41 formed to the lower cover 20 and the recessed portion 42 for placement of the circular cylinder portion 41 formed to the housing 12.
  • an spigot structure is not limited to a structure in which the circular cylinder portion 41 is formed to the lower cover 20 and the recessed portion 42 is formed to the housing 12.
  • an spigot structure may be adopted in which a circular cylinder portion 41 is formed to the housing 12, and a profile (recessed portion 42) for placement of the circular cylinder portion 41 is formed to the lower cover 20.
  • a profile recessed portion 42
  • a circular cylinder portion 41 is formed to an upper face 12B of a housing 12, and a recessed portion 42 is formed to a lower face 20B of a lower cover 20.
  • a seating section 40 is configured as a pressing section over all circumferential direction regions around the rotation direction of the rotary impeller 51, and presses the O-ring 14 in the axial direction X and the radial direction R over all circumferential direction regions.
  • the O-ring 14 is sandwiched in the radial direction R over all circumferential direction regions, and so waterproofing is performed by the O-ring 14 between the housing 12 and the lower cover 20.
  • respective positions of the plural pressing sections, and the respective sizes (circumferential direction lengths) of the plural pressing sections are set to positions and sizes that enable the lower cover 20 to be stabilized with respect to the housing 12.
  • the respective sizes (circumferential direction lengths) of the plural pressing sections are not limited to being the same as each other. The respective lengths thereof may also be different.
  • the pressing section In cases in which there is a single pressing section, there is no limitation to the pressing section being formed in a ring shape around the entire seating section 40.
  • the pressing section may, for example, be configured with a C-shape on plan view.
  • the position and size (circumferential direction length) of the single pressing section is set to a placement and size capable of stabilizing the lower cover 20 with respect to the housing 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP23815755.6A 2022-06-03 2023-05-15 Drain pump Pending EP4534851A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022091050 2022-06-03
PCT/JP2023/018159 WO2023233995A1 (ja) 2022-06-03 2023-05-15 排水ポンプ

Publications (1)

Publication Number Publication Date
EP4534851A1 true EP4534851A1 (en) 2025-04-09

Family

ID=89026455

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23815755.6A Pending EP4534851A1 (en) 2022-06-03 2023-05-15 Drain pump

Country Status (4)

Country Link
EP (1) EP4534851A1 (enrdf_load_stackoverflow)
JP (1) JPWO2023233995A1 (enrdf_load_stackoverflow)
CN (1) CN119301369A (enrdf_load_stackoverflow)
WO (1) WO2023233995A1 (enrdf_load_stackoverflow)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0875003A (ja) * 1994-08-30 1996-03-19 Koide Kinzoku Kogyo Kk シールリングの溝構造
JP2002021778A (ja) * 2000-07-11 2002-01-23 Saginomiya Seisakusho Inc ドレン排水ポンプ
CN202971892U (zh) * 2009-05-08 2013-06-05 Nok株式会社 设备外壳的开闭部分的防水构造
JP2010275972A (ja) 2009-05-29 2010-12-09 Fuji Koki Corp 排水ポンプ
JP5934515B2 (ja) 2012-02-17 2016-06-15 株式会社不二工機 排水ポンプ
JP2013170603A (ja) * 2012-02-17 2013-09-02 Yamaha Motor Co Ltd ２つの部材の嵌合構造、容器、及び減衰力制御弁
JP2022091050A (ja) 2020-12-08 2022-06-20 ヤマハ発動機株式会社 船舶

Also Published As

Publication number Publication date
WO2023233995A1 (ja) 2023-12-07
CN119301369A (zh) 2025-01-10
JPWO2023233995A1 (enrdf_load_stackoverflow) 2023-12-07

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