EP4137701A1 - Pump capable of delivering heated fluid - Google Patents

Pump capable of delivering heated fluid Download PDF

Info

Publication number
EP4137701A1
EP4137701A1 EP22187217.9A EP22187217A EP4137701A1 EP 4137701 A1 EP4137701 A1 EP 4137701A1 EP 22187217 A EP22187217 A EP 22187217A EP 4137701 A1 EP4137701 A1 EP 4137701A1
Authority
EP
European Patent Office
Prior art keywords
impeller
housing
flange
cover portion
pump
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
EP22187217.9A
Other languages
German (de)
French (fr)
Inventor
Yukun Wang
Jin Lu
Liangdong LI
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Hausgeraete GmbH
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 BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of EP4137701A1 publication Critical patent/EP4137701A1/en
Pending legal-status Critical Current

Links

Images

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
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly
    • F04D29/2227—Construction and assembly for special materials
    • 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
    • F04D29/406—Casings; Connections of working fluid 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
    • 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
    • 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
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber
    • 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
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/50—Intrinsic material properties or characteristics
    • F05D2300/502—Thermal properties
    • F05D2300/5021—Expansivity
    • F05D2300/50211—Expansivity similar

Definitions

  • the invention relates to a pump, and in particular, to a pump capable of delivering a heated fluid.
  • a pump generally includes an impeller arranged in an impeller cavity.
  • the impeller is driven by a motor to rotate at a high speed, to drive a fluid to flow.
  • the impeller cavity may be made as small as possible, and therefore there is a quite small gap between the impeller and a wall of the impeller cavity.
  • the impeller of the pump is usually made of plastic.
  • a shell part of the pump and the wall of the impeller cavity are sometimes made of metal, to provide high strength and heat resistance.
  • An objective of the invention is to provide an improved pump, to overcome shortcomings of the related art.
  • Embodiments of the invention include: a pump capable of delivering a heated liquid, including a driving portion, an impeller portion, and a cover portion that are sequentially connected, where a fluid inlet and a fluid outlet are provided on the cover portion, the driving portion includes a first housing, the impeller portion includes an impeller and a second housing, the first housing, the second housing, and the cover portion are sequentially fixedly connected to define an impeller cavity for mounting the impeller, and the second housing and the impeller are respectively made of materials having same or similar thermal expansion coefficients.
  • the second housing and the impeller are both made of plastic.
  • the second housing and the impeller are made of a same material.
  • Beneficial improvements further include that the second housing is located on a radial outer side of the impeller and extends in an axial direction.
  • Beneficial improvements further include that the second housing includes a first flange and a second flange that are located at two ends in the axial direction and a cylindrical peripheral wall located between the first flange and the second flange, and the first flange and the second flange are fixedly connected to the first housing and the cover portion respectively.
  • Beneficial improvements further include that the first housing and the cover portion are respectively made of metal.
  • Beneficial improvements further include that an axial depth of the impeller cavity is slightly greater than an axial thickness of the impeller, and a size difference between the axial depth and the axial thickness is less than 1 mm.
  • a pump 100 may be configured to deliver a heated fluid, such as heated water and/or air.
  • a heating temperature exceeds 40°C.
  • the pump 100 may be applied to washing products such as a washing machine or a dishwasher. In the washing products, water usually needs to be heated to remove dirt. In some washing products, the pump 100 even needs to pump out at least some air.
  • the pump 100 includes a driving portion 10, an impeller portion 20, and a cover portion 30 that are sequentially connected.
  • the driving portion 10 includes a first housing 11 and a motor (not shown) located in the first housing 11.
  • the impeller portion 20 includes a second housing 21 and an impeller 22 located in the second housing 21.
  • a fluid inlet 31 and a fluid outlet 32 are provided on the cover portion 30.
  • the first housing 11, the second housing 21, and the cover portion 30 are sequentially fixedly connected to define an impeller cavity 23 for mounting the impeller 22.
  • the first housing 11 and the cover portion 30 respectively define end portions of the impeller cavity 23 in an axial direction, and the second housing 21 defines a circumferential boundary of the impeller cavity 23.
  • the fluid inlet 31 and the fluid outlet 32 are respectively in spatial communication with the impeller cavity 23.
  • the second housing 21 is located on a radial outer side of the impeller 22 and extends in an axial direction.
  • the second housing 21 includes a first flange 24 and a second flange 25 that are located at two ends in the axial direction and a cylindrical peripheral wall 26 located between the first flange 24 and the second flange 25.
  • the first flange 24 is fixedly connected to the first housing 11.
  • the second flange 25 is fixedly connected to the cover portion 30.
  • an axial depth of the impeller cavity 23 is slightly greater than an axial thickness of the impeller 22, so that there are gaps 4 between the impeller 22 and the end portions of the impeller cavity 23.
  • a size difference between the axial depth of the impeller cavity 23 and the axial thickness of the impeller 22 is less than 1 mm. Therefore, a size sum of the gaps 4 between the impeller 22 and the end portions of the impeller cavity 23 is less than 1 mm. Due to the small gaps, the impeller 22 can easily come into contact with an inner wall of the impeller cavity 23 after thermal expansion, leading to strong friction or even blocking. Therefore, the second housing 21 and the impeller 22 are respectively made of materials having same or similar thermal expansion coefficients.
  • the second housing 21 is also made of plastic.
  • the second housing 21 and the impeller 22 are made of a same material. A material that is required to meet related parameters of both the second housing 21 and the impeller 22 is selected. Therefore, the thermal expansion coefficients of the second housing and the impeller can be ensured to be consistent.
  • the second housing 21 mainly extends in the axial direction, and an axial length is also extended after t thermal expansion.
  • the axial length of the second housing 21 and the axial thickness of the impeller 22 are relatively close, so that size changes thereof are also close. Therefore, the gaps between the impeller 22 and the end portions of the impeller cavity 23 maintain stable, and the impeller 22 is not prone to blocking or excessive friction.
  • the first housing 11 and the cover portion 30 can be respectively made of metal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses a pump capable of delivering a heated liquid. The pump includes a driving portion, an impeller portion, and a cover portion that are sequentially connected. A fluid inlet and a fluid outlet are provided on the cover portion, the driving portion includes a first housing, the impeller portion includes an impeller and a second housing, the first housing, the second housing, and the cover portion are sequentially fixedly connected to define an impeller cavity for mounting the impeller, and the second housing and the impeller are respectively made of materials having same or similar thermal expansion coefficients. Therefore, size changes of the second housing and the impeller after thermal expansion are close, so that a risk of blocking or excessive friction is reduced.

Description

  • The invention relates to a pump, and in particular, to a pump capable of delivering a heated fluid.
  • A pump generally includes an impeller arranged in an impeller cavity. During operation, the impeller is driven by a motor to rotate at a high speed, to drive a fluid to flow. To cause the impeller to better drive the fluid, the impeller cavity may be made as small as possible, and therefore there is a quite small gap between the impeller and a wall of the impeller cavity. The impeller of the pump is usually made of plastic. A shell part of the pump and the wall of the impeller cavity are sometimes made of metal, to provide high strength and heat resistance. When this type of pump is used to deliver a heated fluid, especially when a temperature of the fluid is high, for example, 50°C or more, because the plastic-made impeller and the metal-made wall of the impeller cavity have different thermal expansion coefficients, and the thermal expansion coefficient of the impeller is larger, a degree by which the size of the impeller is increased is larger, and the gap between the impeller and the wall of the impeller cavity is compressed. As a result, the impeller is blocked or excessively worn out.
  • An objective of the invention is to provide an improved pump, to overcome shortcomings of the related art.
  • Embodiments of the invention include: a pump capable of delivering a heated liquid, including a driving portion, an impeller portion, and a cover portion that are sequentially connected, where a fluid inlet and a fluid outlet are provided on the cover portion, the driving portion includes a first housing, the impeller portion includes an impeller and a second housing, the first housing, the second housing, and the cover portion are sequentially fixedly connected to define an impeller cavity for mounting the impeller, and the second housing and the impeller are respectively made of materials having same or similar thermal expansion coefficients.
  • In some embodiments, the second housing and the impeller are both made of plastic.
  • In some embodiments, the second housing and the impeller are made of a same material. Beneficial improvements further include that the second housing is located on a radial outer side of the impeller and extends in an axial direction.
  • Beneficial improvements further include that the second housing includes a first flange and a second flange that are located at two ends in the axial direction and a cylindrical peripheral wall located between the first flange and the second flange, and the first flange and the second flange are fixedly connected to the first housing and the cover portion respectively.
  • Beneficial improvements further include that the first housing and the cover portion are respectively made of metal.
  • Beneficial improvements further include that an axial depth of the impeller cavity is slightly greater than an axial thickness of the impeller, and a size difference between the axial depth and the axial thickness is less than 1 mm.
  • In various embodiments of the invention, size changes of the second housing and the impeller after thermal expansion are close, so that a risk of blocking or excessive friction is reduced. The following describes specific implementations of the invention with reference to the accompanying drawings.
    • FIG. 1 is an exploded view of a pump; and
    • FIG. 2 is a partial cross-sectional view of the pump.
  • As shown in FIG. 1, a pump 100 may be configured to deliver a heated fluid, such as heated water and/or air. For example, a heating temperature exceeds 40°C. The pump 100 may be applied to washing products such as a washing machine or a dishwasher. In the washing products, water usually needs to be heated to remove dirt. In some washing products, the pump 100 even needs to pump out at least some air.
  • As shown in FIG. 1 and FIG. 2, the pump 100 includes a driving portion 10, an impeller portion 20, and a cover portion 30 that are sequentially connected. The driving portion 10 includes a first housing 11 and a motor (not shown) located in the first housing 11. The impeller portion 20 includes a second housing 21 and an impeller 22 located in the second housing 21. A fluid inlet 31 and a fluid outlet 32 are provided on the cover portion 30. The first housing 11, the second housing 21, and the cover portion 30 are sequentially fixedly connected to define an impeller cavity 23 for mounting the impeller 22. The first housing 11 and the cover portion 30 respectively define end portions of the impeller cavity 23 in an axial direction, and the second housing 21 defines a circumferential boundary of the impeller cavity 23. The fluid inlet 31 and the fluid outlet 32 are respectively in spatial communication with the impeller cavity 23.
  • The second housing 21 is located on a radial outer side of the impeller 22 and extends in an axial direction. Specifically, the second housing 21 includes a first flange 24 and a second flange 25 that are located at two ends in the axial direction and a cylindrical peripheral wall 26 located between the first flange 24 and the second flange 25. The first flange 24 is fixedly connected to the first housing 11. The second flange 25 is fixedly connected to the cover portion 30.
  • As shown in FIG. 2, an axial depth of the impeller cavity 23 is slightly greater than an axial thickness of the impeller 22, so that there are gaps 4 between the impeller 22 and the end portions of the impeller cavity 23. A size difference between the axial depth of the impeller cavity 23 and the axial thickness of the impeller 22 is less than 1 mm. Therefore, a size sum of the gaps 4 between the impeller 22 and the end portions of the impeller cavity 23 is less than 1 mm. Due to the small gaps, the impeller 22 can easily come into contact with an inner wall of the impeller cavity 23 after thermal expansion, leading to strong friction or even blocking. Therefore, the second housing 21 and the impeller 22 are respectively made of materials having same or similar thermal expansion coefficients. Because the impeller 22 is usually made of plastic, the second housing 21 is also made of plastic. Alternatively, the second housing 21 and the impeller 22 are made of a same material. A material that is required to meet related parameters of both the second housing 21 and the impeller 22 is selected. Therefore, the thermal expansion coefficients of the second housing and the impeller can be ensured to be consistent. The second housing 21 mainly extends in the axial direction, and an axial length is also extended after t thermal expansion. The axial length of the second housing 21 and the axial thickness of the impeller 22 are relatively close, so that size changes thereof are also close. Therefore, the gaps between the impeller 22 and the end portions of the impeller cavity 23 maintain stable, and the impeller 22 is not prone to blocking or excessive friction.
  • To maintain the entire strength and the thermal deformation resistance of the pump 100, the first housing 11 and the cover portion 30 can be respectively made of metal.
  • The various specific implementations described above and shown in the accompanying drawings are only used to illustrate the invention, but are not all of the invention. Any variation made by a person of ordinary skill in the art to the invention within the scope of the basic technical concept of the invention shall fall within the protection scope of the invention.

Claims (7)

  1. A pump capable of delivering a heated fluid, comprising a driving portion (10), an impeller portion (20), and a cover portion (30) that are sequentially connected, wherein a fluid inlet (31) and a fluid outlet (32) are provided on the cover portion, the driving portion comprises a first housing (11), the impeller portion comprises an impeller (22) and a second housing (21), and the first housing, the second housing, and the cover portion are sequentially fixedly connected to define an impeller cavity (23) for mounting the impeller, characterized in that the second housing and the impeller are respectively made of materials having same or similar thermal expansion coefficients.
  2. The pump according to claim 1, characterized in that the second housing and the impeller are both made of plastic.
  3. The pump according to claim 1, characterized in that the second housing and the impeller are made of a same material.
  4. The pump according to claim 1, characterized in that the second housing is located on a radial outer side of the impeller and extends in an axial direction.
  5. The pump according to claim 4, characterized in that the second housing comprises a first flange (24) and a second flange (25) that are located at two ends in the axial direction and a cylindrical peripheral wall (26) located between the first flange and the second flange, and the first flange and the second flange are fixedly connected to the first housing and the cover portion respectively.
  6. The pump according to claim 1, characterized in that the first housing and the cover portion are respectively made of metal.
  7. The pump according to claim 1, characterized in that an axial depth of the impeller cavity is slightly greater than an axial thickness of the impeller, and a size difference between the axial depth and the axial thickness is less than 1 mm.
EP22187217.9A 2021-08-16 2022-07-27 Pump capable of delivering heated fluid Pending EP4137701A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121917675.4U CN216111302U (en) 2021-08-16 2021-08-16 Pump for conveying heated fluid

Publications (1)

Publication Number Publication Date
EP4137701A1 true EP4137701A1 (en) 2023-02-22

Family

ID=80726315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22187217.9A Pending EP4137701A1 (en) 2021-08-16 2022-07-27 Pump capable of delivering heated fluid

Country Status (2)

Country Link
EP (1) EP4137701A1 (en)
CN (1) CN216111302U (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2402785A1 (en) * 1977-09-07 1979-04-06 Julien & Mege Electrically driven centrifugal pump for central heating - has moulded plastics volute and inlet duct to eye of impeller
US5044883A (en) * 1985-07-09 1991-09-03 Ludwig Neueder Water pump or the like
EP0484214B1 (en) * 1990-10-29 1994-12-28 POMPES SALMSON Société Anonyme à directoire dite: Casing of a pressurised chamber and motorpump using such casing
US20180087532A1 (en) * 2016-09-23 2018-03-29 Sulzer Management Ag Centrifugal pump for conveying a fluid

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2402785A1 (en) * 1977-09-07 1979-04-06 Julien & Mege Electrically driven centrifugal pump for central heating - has moulded plastics volute and inlet duct to eye of impeller
US5044883A (en) * 1985-07-09 1991-09-03 Ludwig Neueder Water pump or the like
EP0484214B1 (en) * 1990-10-29 1994-12-28 POMPES SALMSON Société Anonyme à directoire dite: Casing of a pressurised chamber and motorpump using such casing
US20180087532A1 (en) * 2016-09-23 2018-03-29 Sulzer Management Ag Centrifugal pump for conveying a fluid

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ASHTON D R: "THE DEVELOPMENT OF CENTRIFUGAL CHEMICAL PROCESS PUMPS USING MODERN HIGH-GRADE CERAMIC MATERIALS", WORLD PUMPS, ELSEVIER ADVANCED TECHNOLOGY, GB, no. 3, 1 March 1990 (1990-03-01), pages 27 - 30, XP000134451, ISSN: 0262-1762 *

Also Published As

Publication number Publication date
CN216111302U (en) 2022-03-22

Similar Documents

Publication Publication Date Title
US8245718B2 (en) Pump having a heating device
US9388822B2 (en) Guide ring for an impeller pump and impeller pump
US7033146B2 (en) Sealed magnetic drive sealless pump
EP0631366B1 (en) Magnet pump with rear thrust bearing member
CA2109126C (en) Eccentric screw pump
WO2014160421A1 (en) Alternating paddle mechanism for pool cleaner
US6419450B1 (en) Variable width pump impeller
EP4137701A1 (en) Pump capable of delivering heated fluid
US20050196274A1 (en) Centrifugal pump
CN111075697B (en) Peristaltic pump and household electrical appliance comprising same
EP3126679B1 (en) Centrifugal pump for household appliances
US5228831A (en) Sheet metal centrifugal pump casing
US9222476B2 (en) Rotary pump with spiral casing
US6280156B1 (en) Magnetically coupled rotary pump
EP0744568B1 (en) A pump provided with at least one rotary shaft
BR112013022590B1 (en) free flow pump
US20160007823A1 (en) Pump assembly
CN107023493A (en) Centrifugal electric pump and the motor case for the pump
EP3453882B1 (en) Axial flow pump and household appliance employing such pump
US6685428B1 (en) Integrated boot, seal and impeller system
EP2665939B1 (en) Centrifugal electric pump for suction of aeriform fluids with liquids anti-infiltration device
JP5118951B2 (en) Centrifugal pump impeller and centrifugal pump
KR20090012758U (en) Circulation pump for a hot-water mat
JP2021032398A (en) Fuel pump
JP5047471B2 (en) pump

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20230822

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR