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EP1344942A2 - Wasserpumpe - Google Patents

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Publication number
EP1344942A2
EP1344942A2 EP03005714A EP03005714A EP1344942A2 EP 1344942 A2 EP1344942 A2 EP 1344942A2 EP 03005714 A EP03005714 A EP 03005714A EP 03005714 A EP03005714 A EP 03005714A EP 1344942 A2 EP1344942 A2 EP 1344942A2
Authority
EP
European Patent Office
Prior art keywords
electrically motorized
sleeve
poly
rbc
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.)
Withdrawn
Application number
EP03005714A
Other languages
English (en)
French (fr)
Other versions
EP1344942A3 (de
Inventor
Kazuo c/o Minebea Co. Ltd. Hokkirigawa
Motoharu c/o Minebea Co. Ltd. Akiyama
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.)
Minebea Co Ltd
Original Assignee
Minebea Co Ltd
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 Minebea Co Ltd filed Critical Minebea Co Ltd
Publication of EP1344942A2 publication Critical patent/EP1344942A2/de
Publication of EP1344942A3 publication Critical patent/EP1344942A3/de
Withdrawn legal-status Critical Current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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/0465—Ceramic bearing designs
    • 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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/047—Bearings hydrostatic; hydrodynamic
    • 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
    • F05D2300/44—Resins

Definitions

  • the present invention relates to an electrically motorized pump for circulating cooling water in a water-cooled engine. More particularly, the present invention relates to an electrically motorized water pump that uses a sleeve bearing which offers a low frictional coefficient in water.
  • a conventional water pump for pumping cooling water in a closed cooling water circuit is driven by a crank shaft of an engine.
  • the cooling water circuit includes a water jacket of the engine connected to a radiator of the engine.
  • Such a conventional pump's rotation corresponds to the number of revolutions of the engine. The number of revolutions of such pump could not be controlled in a fine manner. Furthermore, when the engine stops, the pump stops immediately thereby causing troubles.
  • the conventional electrically motorized pomp for use with water has a structure in which the impeller side and the rotor side of a pump are sealed to prevent water from flowing through.
  • An O ring made of rubber is placed between the impeller side and the rotor side or a sealing material is allowed to be in close contact with a rotary shaft.
  • One object of the present invention is to provide an electrically motorized pump for use in water which does not require any seal between the impeller side and the rotor side of a pump, allows water to freely flow therethrough, has low power consumption, and allows cooling water to circulate efficiently in a water-cooled engine.
  • RBC RB ceramic
  • thermosetting resin including a phenol resin, a diaryl phthalate resin, an unsaturated polyester resin, an epoxy resin, a poly imide resin, or a triazine resin may be used. Phenol resin being the preferred material.
  • the mixing ratio between defatted rice bran and the thermosetting resin is 50 to 90:50 to 10 by mass, 75:25 being the preferred ratio. Sintering is done at 700° C to 1000° C for about 40 minutes to 120 minutes using, for example, a rotary kiln.
  • CRB ceramic (hereinafter referred to as "CRBC") is a black colored porous ceramic obtained by further improving RBC as follows: after mixing and kneading defatted rice bran and a thermosetting resin, and then preliminarily sintering the mixture at a temperature of 700 ° C to 1000 ° C in an inert gas atmosphere, the mixture is pulverized to about 100 mesh or less to generate a carbonized powder. Next, the carbonized powder and a thermosetting resin are mixed and kneaded, and after molding it under pressure of 20 Mpa to 30 Mpa, the molded substance is again heat treated at a temperature of 500° C to 1100° C in an inert gas atmosphere to obtain CRBC.
  • the shortcomings of the prior art are overcome by the present invention by providing an electrically motorized pump for use in water.
  • the pump has a stator accommodated in an outer peripheral space between a housing with a collar and a can seal with a collar.
  • a rotor, a rotary shaft, and a sleeve bearing are accommodated in the inner space of the can seal.
  • the sleeve bearing is attached to a central hole of a base plate of a pump casing. Said base plate, a collar section of the housing and the can seal are attached to each other.
  • An impeller attached to a tip section of the rotary shaft is located in the inner side of the pump casing.
  • the electrically motorized pump has a low energy loss because it uses a shaft and a sleeve made from a synthetic resin composition obtained by uniformly dispersing a fine powder of RBC or CRBC in a resin.
  • the synthetic resin composition obtained by uniformly dispersing a fine powder of RBC or CRBC, especially at a ratio by mass of the fine powder of RBC or CRBC: resin, of 30 to 90:70 to 10 displays surprisingly good wear characteristics with anti-rust property in water, alcohol, ethylene glycol and a mixture thereof.
  • the typical process for the production of a synthetic resin composition for making the sleeve bearing for the pump for use in water includes kneading with a resin the fine powder of RBC or CRBC at a temperature in the neighborhood of the melting point of the resin, and thereby uniformly dispersing the fine powder of RBC or CRBC in the resin.
  • the RBC can also be made using materials other than rice bran that can be a source of carbon.
  • bran of another grain such as oat.
  • Fig. 1 is a schematic drawing showing the assembly of a pump for use in water.
  • Sleeve bearings 2 and 2' are slidably Mounted a the rotary shaft 1-1.
  • a rotor 1' is attached to rotary shaft 1-1 to form a rotor assembly 1.
  • An impeller 4 is mounted at the tip section of rotary shaft 1-1 and protrudes into pump casing 5 from a central section 3 of pump casing 5 through an O-ring 11.
  • a stator assembly 8 for the rotation of rotor 1 is tightly sealed in a water tight outer peripheral space formed by a can seal 9 with a collar and a housing 6 with a collar so as to prevent water from penetrating.
  • a hole sensor assembly 7 is placed within housing 6. Rotor assembly 1 is placed within can seal 9.
  • a pump assembly is made by attaching together housing 6, central section 3 and pump casing 5 through O-ring 11 by means of a fixing means such as a screw, or a bolt and a nut.
  • the pump assembly so formed allows fluid from impeller side to flow to the rotor side.
  • Fig. 2 shows the cross sectional view of the pump for use with water.
  • stator assembly 8 When an electric current is allowed to flow through stator assembly 8, rotor 1 rotates, thereby rotating rotary shaft 1-1 and impeller 4 and thus water is taken in and sent to the cooling section of an engine.
  • Sleeve bearing 2 consists of shaft 1-1 and sleeve 2-2. Bither one or both of Shaft 1-1 and Sleeve 2-2 are formed by molding a synthetic resin composition obtained by uniformly dispersing fine powder of RBC or CRBC in a resin.
  • shaft 1-1 is made of an alloy from the stainless steel family. If a hard shaft is rcquired, quenching is carried out. As shown in Fig. 4, if necessary, it is permissible to press a hard anti- rusting alloy sleeve 1-2 in portion of shaft 1-1.
  • Non limiting examples of steel series metal that may be used for making shaft 1-1 or sleeve 2-2 are stainless steel type alloy of iron, nickel, chrome, and molybdenum. Any alloy, as long as it is hard and difficult to rust, can be used. Furthermore, it is also permissible to make shaft 1-1 with the above-mentioned synthetic resin composition.
  • the RBC or CRBC has an average particle diameter of 300 ⁇ m or less. Average particle diameter of 10 to 100 ⁇ m, more preferably 10 to 50 ⁇ m, allows a surface condition of a good frictional coefficient to be formed, and is appropriate as a material for a sleeve bearing for sliding motion in water.
  • Resins such as, for example, poly amide, polyester, and poly olefin can be used with RBC or CRBC to obtain synthetic resin composition.
  • Thermoplastic resins such as nylon 66 (poly hexa- methylene adipamide), nylon 6 (poly capramide), nylon 11 (poly undecane amide), nylon 12, poly acetal, poly butylenes terephthalate, poly ethylene terephthalate, poly propylene, poly ethylene, and poly phenylene sulfide can also be used with RBC or CRBC to obtain the synthetic resin composition, nylon 66 being preferred.
  • These thermoplastic resins can be used alone or a mixture of two or more may be used.
  • thermosetting resin alone or in combination with other resins can be used with RBC or CRBC to obtain synthetic resin composition.
  • thermosetting resins are diaryl phthalate resin, an unsaturated polyester resin, an epoxy resin, a poly imide resin, or a triazine resin.
  • RBC can also be made from materials other than rice bran that can be source of carbon.
  • the ratio by mass of fine powder of RBC or CRBC to resin is 30 to 90:70 to 10. If the amount of a resin or a combination of resins exceeds 70 % by mass, the low frictional characteristics can not be achieved, on the other hand, if a resin or a combination of resins is 10 % by mass or less, the molding becomes difficult.
  • the molding is in general done by extrusion molding or injection molding.
  • the preferred temperature of the mold die is on a slightly lower side between the glass transition point and the melting point of the resin. Furthermore, good frictional property can be obtained by gradual cooling of the mold die.
  • the synthetic resin composition obtained by molting and mixing the RBC fine powder and nylon 66 was injection molded, thereby preparing a sleeve of 22 mm in outer diameter, 8 mm in inner diameter, and 20 mm in length.
  • a shaft of 7.95 mm in outer diameter and 200 mm in length made of SUS 303 stainless alloy was inserted into the molded sleeve, thereby preparing a sleeve bearing as shown in Fig. 3.
  • this sleeve was used in the sleeve bearings 2 and 2' for a rotor assembly.
  • the synthetic resin composition obtained by molting and mixing the RBC fine powder and nylon 66 was injection molded, thereby preparing a sleeve of 22 mm in outer diameter, 8 mm in inner diameter, and 20 mm in length.
  • a shaft of 7.95 mm in outer diameter and 200 mm in length made of SUS 304 stainless alloy was inserted into the molded sleeve, thereby preparing a sleeve bearing as shown in Fig. 3.
  • this sleeve was used in sleeve bearings 2 and 2' of a rotor assembly.
  • the synthetic resin composition obtained by melting and mixing the RBC fine powder and nylon 66 was injection molded, thereby preparing a sleeve of 22 mm in outer diameter, 8 mm in inner diameter, and 20 mm in length.
  • a shaft of 7.95 mm in outer diameter and 200 mm in length made of SUS bearing steel was inserted into the molded sleeve, thereby preparing a sleeve bearing as shown in Fig. 3.
  • Fig. 1 and Fig. 2 it was used as sleeve bearings 2 and 2' of a rotor assembly.
  • the CRBC molded product thus obtained was pulverized in a pulverizing machine, followed by sieving with a sieve of 500 mesh to obtain CRBC fine powder having an average particle diameter of 20 to 30 ⁇ m.
  • the synthetic resin composition obtained by melting and mixing the CRBC fine powder and nylon 66 was injection molded into a sleeve of 22 mm in outer diameter, 8 mm in inner diameter, and 20 mm in length.
  • a 200 mm long shaft is made by pressing two cylindrical members of 7.95 mm in outer diameter, 5.00 in inner diameter and 20 mm in length and made of SUS 304 stainless alloy into both ends of the shaft.
  • the shaft was inserted into the molded sleeves, thereby preparing a sleeve bearing as shown in Fig. 4. It was used for sleeve bearings 2 and 2' of the rotor assembly shown in Fig. 1 and Fig, 2.
  • compositions of RBC or CRBC and resins used in Example 5 through Example 9 were prepared by using the same RBC or CRBC fine powder as produced in Example 1 through Example 4 and by dispersing the fine powder of the RBC or the CRBC in resins under the conditions as indicated in Table 1.
  • commercially available PPS resin for pumps used in water made by Idemitsu Sekiyu Kagaku K., K. Co., Ltd. was used.
  • Composition 5 Composition 6
  • Composition 7 Composition 8 Composition 9 Ex. For comp.
  • Types of RBC and CRBC fine powder One used in Ex.4 One used in Ex.3 One used in Ex, 1 One used in Ex.2 One used in Ex.2 - Synthetic resin Nylon 66 PBT PP PPS Nylon 66 PPS Fine powder: resin (ratio by mass) 70:30 50:50 70:30 50:50 30:70 - PBT: poly butylenes terephthalate PP : poly propylene PPS: poly phenylene sulfide
  • the synthetic resin composition 5 listed in Table 1 was injection molded, thereby preparing a sleeve of 22 mm in outer diameter, 8 mm in inner diameter, and 20 mm in length having a spiral groove of 0.1 mm in depth on the inner side, A shaft of 7.95 mm in outer diameter and 200 mm in length made of SUS bearing steel was inserted into the molded sleeves, thereby preparing sleeve bearings shown in Fig. 3. These sleeve bearings were used for sleeve bearings 2 and 2' of the rotor assembly shown in Fig. 1 and Fig. 2.
  • the synthetic resin composition 6 listed in Table 1 was injection molded, thereby preparing a shaft of 7.95 mm in outer diameter, and 200 mm in length.
  • Sleeves 22 mm in outer diameter, 8 mm in inner diameter, and 120 mm in length were made from SUS bearing steel. The sleeves were inserted on the shaft to form sleeve bearings as shown In Fig. 3. These sleeve bearings were used for sleeve bearings 2 and 2' of the rotor assembly shown in Fig. 1 and Fig. 2.
  • the synthetic resin oomposition 7 listed in Table 1 was injection molded, thereby preparing a shaft of 7.95 mm in outer diameter, and 200 mm in length having a spiral groove of 0.1 mm in depth.
  • Sleeves 22 mm in outer diameter, 8 mm in inner diameter and 20 mm in length were made from SUS bearing steel. The sleeves were inserted on the shaft to form sleeve bearings as shown in Fig. 3. These sleeve bearings were used for sleeve bearings 2 and 2' of the rotor assembly shown in Fig. 1 and Fig. 2.
  • the synthetic resin composition 8 listed in Table 1 was injection molded, to prepare two sleeves of 22 mm in outer diameter, 8 mm in inner diameter, and 20 mm in length.
  • a shaft of 7.95 mm in outer diameter and 200 mm in length made of SUS bearing steel having a spiral groove of 0.1 mm in depth was inserted into the sleeves, thereby preparing sleeve bearings as shown in Fig. 3.
  • These sleeve bearings were used for sleeve bearings 2 and 2' of the rotor assembly shown in Fig. 1 and Fig. 2.
  • the synthetic resin composition 9 listed in Table 1 was injection molded, thereby preparing a shaft of 7.95 mm in outer diameter, and 200 mm in length having a spiral groove of 0.1 mm in depth.
  • Sleeves 22 mm in outer diameter, 8 mm in inner diameter and 20 mm in length were made from SUS bearing steel. The sleeves were inserted on the shaft to form sleeve bearings as shown in Fig. 3. These sleeve bearings were used for sleeve bearings 2 and 2' of the rotor assembly shown in Fig. 1 and Fig. 2.
  • the commercially available PPS resin for pump for use with water (made by Idemitsu Sekiyu Kagaku K., K., Co., Ltd.) was injection molded, thereby preparing sleeves 22 mm in outer diameter, 8 mm in inner diameter and 20 mm in length.
  • a shaft of 7.95 mm in outer diameter and 200 mm in length made of SUS 303 stainless alloy was inserted into the sleeves, thereby preparing a sleeve bearing as shown in Fig. 3.
  • These sleeve bearings were used for sleeve bearings 2 and 2' of the rotor assembly shown in Fig. 1 and Fig. 2.
  • the pumps for use with water which use the sleeve bearings made from the synthetic resin compositions of fine powder of RBC and CRBC and the resins are markedly excellent in frictional characteristics in Water.
  • an electrically motorized pump for use in water which does not require any seal between the impeller side and the rotor side of a pump, allows a water fluid to freely flow, saves power consumption, allows cooling water for a water-cooled engine to be effectively circulated and is low in energy loss.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
EP03005714A 2002-03-13 2003-03-13 Wasserpumpe Withdrawn EP1344942A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002069357 2002-03-13
JP2002069357 2002-03-13

Publications (2)

Publication Number Publication Date
EP1344942A2 true EP1344942A2 (de) 2003-09-17
EP1344942A3 EP1344942A3 (de) 2004-09-15

Family

ID=27764524

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03005714A Withdrawn EP1344942A3 (de) 2002-03-13 2003-03-13 Wasserpumpe

Country Status (2)

Country Link
US (1) US20030210995A1 (de)
EP (1) EP1344942A3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106930970A (zh) * 2017-05-02 2017-07-07 浙江腾宇泵阀设备有限公司 一种双层复合结构工程塑料的磁力泵隔离套
CN106949069A (zh) * 2017-05-15 2017-07-14 华中科技大学 一种刻槽轴承动压悬浮机械泵
WO2020244590A1 (zh) * 2019-06-04 2020-12-10 深圳市德宇鑫科技有限公司 一种微型水泵的防虹吸机构以及微型水泵

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN106930970A (zh) * 2017-05-02 2017-07-07 浙江腾宇泵阀设备有限公司 一种双层复合结构工程塑料的磁力泵隔离套
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WO2020244590A1 (zh) * 2019-06-04 2020-12-10 深圳市德宇鑫科技有限公司 一种微型水泵的防虹吸机构以及微型水泵

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US20030210995A1 (en) 2003-11-13
EP1344942A3 (de) 2004-09-15

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