JP2005240627A - Constraint preventing structure of submergible centrifugal pump - Google Patents

Constraint preventing structure of submergible centrifugal pump Download PDF

Info

Publication number
JP2005240627A
JP2005240627A JP2004049929A JP2004049929A JP2005240627A JP 2005240627 A JP2005240627 A JP 2005240627A JP 2004049929 A JP2004049929 A JP 2004049929A JP 2004049929 A JP2004049929 A JP 2004049929A JP 2005240627 A JP2005240627 A JP 2005240627A
Authority
JP
Japan
Prior art keywords
peripheral surface
impeller
pump casing
pump
inner peripheral
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.)
Granted
Application number
JP2004049929A
Other languages
Japanese (ja)
Other versions
JP4540363B2 (en
Inventor
Junko Sakurai
純子 櫻井
Masahiko Fukuda
正彦 福田
Hirohisa Kimura
啓久 木村
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.)
Tsurumi Manufacturing Co Ltd
Original Assignee
Tsurumi Manufacturing 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 Tsurumi Manufacturing Co Ltd filed Critical Tsurumi Manufacturing Co Ltd
Priority to JP2004049929A priority Critical patent/JP4540363B2/en
Publication of JP2005240627A publication Critical patent/JP2005240627A/en
Application granted granted Critical
Publication of JP4540363B2 publication Critical patent/JP4540363B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Landscapes

  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a constraint preventing structure of a submergible centrifugal pump, not impairing the function of transferring uplift liquid to a height or long distance as a high lift pump and no causing biting of foreign matter in sewage. <P>SOLUTION: An annular gap (a side clearance) formed between the inner peripheral surface of a pump casing 1 formed concentrically with an interior impeller 2 and the outer peripheral surface of the impeller 2 is formed as a small gap 4b in the upper part and as a large gap 4a in the lower part. Foreign matter in the uplift liquid sucked into the pump casing 1 is released to the lower large gap 4a to prevent a lock accident of the impeller 2 due to biting of foreign matter, and the function of transferring uplift liquid to a height or long distance as the high lift pump is not impaired owing to the existence of the small gap 4b in the upper part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、水中遠心ポンプの拘束防止構造に関するものである。   The present invention relates to a restraining prevention structure for a submersible centrifugal pump.

周知のように、水中遠心ポンプでは高揚程化等に伴い、ポンプケーシング内周面と羽根車外周との間に形成される環状間隙（側方クリアランス）が狭められた構造となっている（例えば、特許文献１および２参照。）。しかし、高揚程化等に対応させて側方クリアランスを狭くすれば、汚水中では異物の噛み込みによる羽根車拘束（ロック）事故が問題となる。また、異物の噛み込みを生じさせないため側方クリアランスを大きくすれば、高揚程ポンプとしての揚液の高所或いは長距離移送機能が損われることになる。
特開２０００−１７９４８９号公報 （第１−４図） 特開２００２−２１７６９号公報 （第１図） As is well known, submersible centrifugal pumps have a structure in which an annular gap (side clearance) formed between the inner peripheral surface of the pump casing and the outer periphery of the impeller is narrowed with an increase in head height (for example, And Patent Documents 1 and 2.). However, if the side clearance is made narrower in response to an increase in the head height or the like, an impeller restraint (lock) accident due to the biting of foreign matter becomes a problem in sewage. Further, if the lateral clearance is increased in order not to cause foreign matter to be caught, the height of the pumped liquid or the long-distance transfer function as the high head pump is impaired.
JP 2000-179489 A (Fig. 1-4) Japanese Patent Laid-Open No. 2002-21769 (FIG. 1)

解決しようとする課題は、高揚程ポンプとしての揚液の高所或いは長距離移送機能を損うことなく、しかも汚水中における異物の噛み込みを生じさせることのない、水中遠心ポンプの拘束防止構造を提供することである。   The problem to be solved is a structure for preventing restraint of a submersible centrifugal pump that does not impair the height or long-distance transfer function of the pumped liquid as a high-lift pump and does not cause foreign matter to be caught in sewage. Is to provide.

本発明では、ポンプケーシングの内周面と羽根車の外周面との間に形成される環状間隙（側方クリアランス）が、下方で狭く上方で広く形成されていることを、最も主要な特徴とする。   In the present invention, the most important feature is that an annular gap (side clearance) formed between the inner peripheral surface of the pump casing and the outer peripheral surface of the impeller is formed narrower in the lower part and wider in the upper part. To do.

本発明によれば、ポンプケーシング内へ吸込まれた揚液中の異物は、環状間隙上方部の広い間隙へ逃がされるため、異物の噛み込みによる羽根車の拘束（ロック）事故を起すことがなく、また、環状間隙の下方部は狭い間隙に形成されているため、高揚程ポンプとしての揚液の高所或いは長距離移送機能が損われることもない。   According to the present invention, the foreign matter in the pumped liquid sucked into the pump casing is released to the wide gap above the annular gap, so that the impeller restraint (lock) accident due to the biting of the foreign matter does not occur. Moreover, since the lower part of the annular gap is formed in a narrow gap, the height of the pumped liquid or the long distance transfer function as a high head pump is not impaired.

ポンプケーシングの内周面が、内装される羽根車と同心状に形成され、羽根車シュラウドの外周面が、ポンプケーシングの内周面上方部と広い間隙を保って対向するよう小径に形成され、該シュラウドの下面より突出する羽根板の外側端面が、ポンプケーシングの内周面下方部と狭い間隙を保って対向するよう形成する。   The inner peripheral surface of the pump casing is formed concentrically with the impeller to be installed, and the outer peripheral surface of the impeller shroud is formed with a small diameter so as to face the upper portion of the inner peripheral surface of the pump casing with a wide gap, The outer end surface of the blade that protrudes from the lower surface of the shroud is formed so as to face the lower part of the inner peripheral surface of the pump casing while maintaining a narrow gap.

図１および図２において、１はポンプケーシングであり、内装される羽根車２と同心状に形成された内周面が、下方部よりも上方部で大径に形成され、羽根車２の外周面との間に形成される環状間隙（側方クリアランス）の上方部、特にシュラウド３の外周面と対向する部位で広い間隙４ａとなり、羽根板５・・５の外側端面と対向する部位で狭い間隙４ｂとなっている。６はポンプケーシング１の下壁中央に開設された吸込口、７はポンプケーシング１の側壁の一側部に開設された吐出口である。この構造により、水中遠心ポンプの運転時、吸込口６からポンプケーシング１内へ吸込まれた揚液中の異物は、環状間隙上方部の広い間隙４ａへ逃がされるため、異物の噛み込みによる羽根車２の拘束（ロック）事故を起すことなくポンプケーシング１内を一巡して吐出口７から揚液と共に揚送される。また、環状間隙の下方部は狭い間隙４ｂに形成されているため、高揚程ポンプとしての揚液の高所或いは長距離移送機能が損われることはない。   In FIG. 1 and FIG. 2, reference numeral 1 denotes a pump casing, and an inner peripheral surface formed concentrically with an internally installed impeller 2 is formed to have a larger diameter at an upper portion than a lower portion, and an outer periphery of the impeller 2. A wide gap 4a is formed at the upper part of the annular gap (side clearance) formed between the two surfaces, particularly at the portion facing the outer peripheral surface of the shroud 3, and narrow at the portion facing the outer end face of the blades 5. A gap 4b is formed. 6 is a suction port established in the center of the lower wall of the pump casing 1, and 7 is a discharge port established on one side of the side wall of the pump casing 1. With this structure, during operation of the submersible centrifugal pump, foreign matter in the pumped liquid sucked into the pump casing 1 from the suction port 6 is released to the wide gap 4a at the upper part of the annular gap. The pump 2 is pumped up together with the pumped liquid from the discharge port 7 without causing a restraint (lock) accident. Further, since the lower part of the annular gap is formed in the narrow gap 4b, the height of the pumped liquid as the high head pump or the long distance transfer function is not impaired.

図３において、１はポンプケーシングであり、内装される羽根車２と同心状に形成された内周面を有している。羽根車２は外周面が、下方部よりも上方部で小径に形成され、ポンプケーシング１の内周面との間に形成される環状間隙（側方クリアランス）の上方部で広い間隙４ａとなり下方部で狭い間隙４ｂとなっている。６はポンプケーシング１の下壁中央に開設された吸込口、７はポンプケーシング１の側壁の一側部に開設された吐出口である。この構造により、水中遠心ポンプの運転時、吸込口６からポンプケーシング１内へ吸込まれた揚液中の異物は、環状間隙上方部の広い間隙４ａへ逃がされるため、異物の噛み込みによる羽根車２の拘束（ロック）事故を起すこなくポンプケーシング１内を一巡して吐出口７から揚液と共に揚送される。また、環状間隙の下方部は狭い間隙４ｂに形成されているため、高揚程ポンプとしての揚液の高所或いは長距離移送機能が損われることはない。   In FIG. 3, 1 is a pump casing, which has an inner peripheral surface formed concentrically with the impeller 2 to be installed. The impeller 2 has an outer peripheral surface having a smaller diameter at the upper part than the lower part, and becomes a wide gap 4a at the upper part of the annular gap (side clearance) formed between the inner surface of the pump casing 1 and the lower part. The gap 4b is narrow at the part. 6 is a suction port established in the center of the lower wall of the pump casing 1, and 7 is a discharge port established on one side of the side wall of the pump casing 1. With this structure, foreign matter in the pumped liquid sucked into the pump casing 1 from the suction port 6 during the operation of the submersible centrifugal pump is released to the wide gap 4a at the upper part of the annular gap. The pump 2 is pumped up together with the pumped liquid from the discharge port 7 without causing a restraint (lock) accident. Further, since the lower part of the annular gap is formed in the narrow gap 4b, the height of the pumped liquid as the high head pump or the long distance transfer function is not impaired.

図４において、１はポンプケーシングであり、内装される羽根車２と同心状に形成された内周面が、下方部よりも上方部で大径に形成されている。羽根車２の外周面は、下方部よりも上方部で小径に形成されており、該羽根車２の外周面と前記ポンプケーシング１の内周面との対向面間に形成される環状間隙（側方クリアランス）は、上方部で広い間隙４ａとなり、下方部で狭い間隙４ｂとなっている。この構造により、水中遠心ポンプの運転時、吸込口６からポンプケーシング１内へ吸込まれた揚液中の異物は、環状間隙上方部の広い間隙４ａへ逃がされるため、異物の噛み込みによる羽根車２の拘束（ロック）事故を起すこなくポンプケーシング１内を一巡して吐出口７から揚液と共に揚送される。また、環状間隙の下方部は狭い間隙４ｂに形成されているため、高揚程ポンプとしての揚液の高所或いは長距離移送機能が損われることはない。   In FIG. 4, 1 is a pump casing, and the inner peripheral surface formed concentrically with the impeller 2 to be installed is formed in a larger diameter in the upper part than in the lower part. The outer peripheral surface of the impeller 2 is formed to have a smaller diameter in the upper portion than the lower portion, and an annular gap formed between the opposing surfaces of the outer peripheral surface of the impeller 2 and the inner peripheral surface of the pump casing 1 ( The side clearance is a wide gap 4a in the upper part and a narrow gap 4b in the lower part. With this structure, during operation of the submersible centrifugal pump, foreign matter in the pumped liquid sucked into the pump casing 1 from the suction port 6 is released to the wide gap 4a at the upper part of the annular gap. The pump 2 is pumped up together with the pumped liquid from the discharge port 7 without causing a restraint (lock) accident. Further, since the lower part of the annular gap is formed in the narrow gap 4b, the height of the pumped liquid as the high head pump or the long distance transfer function is not impaired.

図５において、１はポンプケーシングであり、内装される羽根車２と同心状に形成された内周面を有している。羽根車２はシュラウド３の外周面が、羽根板５・・５の外側端面よりも小径に形成されてポンプケーシング１の内周面上方部との間に広い間隙４ａを保って対向し、シュラウド３の下面より突出する羽根板５・・５の外側端面が、ポンプケーシング１の内周面下方部と狭い間隙４ｂを保って対向する。６はポンプケーシング１の下壁中央に開設された吸込口、７はポンプケーシング１の側壁の一側部に開設された吐出口である。この構造により、水中遠心ポンプの運転時、吸込口６からポンプケーシング１内へ吸込まれた揚液中の異物が環状間隙内へ侵入しても、羽根板５・・５の突出先端部により外周方向へ蹴り出されるため、異物の噛み込みによる羽根車２の拘束（ロック）事故を起すこなくポンプケーシング１内を一巡して吐出口７から揚液と共に揚送される。また、前述のように突出された羽根板５・・５の外側端面が、ポンプケーシング１の内周面下方部と狭い間隙４ｂを保って対向した態様となっているため、高揚程ポンプとしての揚液の高所或いは長距離移送機能が損われることはない。   In FIG. 5, 1 is a pump casing, which has an inner peripheral surface formed concentrically with the impeller 2 to be installed. The impeller 2 is opposed to the shroud 3 with the outer peripheral surface of the shroud 3 having a smaller diameter than the outer end surface of the vane plates 5... 5 with a wide gap 4 a between the upper portion of the inner peripheral surface of the pump casing 1. The outer end surfaces of the blades 5.. 5 projecting from the lower surface of 3 face the lower part of the inner peripheral surface of the pump casing 1 with a narrow gap 4b. 6 is a suction port established in the center of the lower wall of the pump casing 1, and 7 is a discharge port established on one side of the side wall of the pump casing 1. With this structure, even when foreign matter in the pumped liquid sucked into the pump casing 1 from the suction port 6 enters the annular gap during operation of the submersible centrifugal pump, the outer periphery is projected by the projecting tip of the blades 5. Since the impeller 2 is kicked in the direction, the impeller 2 is pumped up from the discharge port 7 together with the pumped liquid without causing an accident of restraining (locking) the impeller 2 due to the biting of foreign matter. Moreover, since the outer end surface of the blades 5.. 5 projected as described above is opposed to the lower part of the inner peripheral surface of the pump casing 1 with a narrow gap 4b, the high lift pump is used. The height of the pumped liquid or the long distance transfer function is not impaired.

図１ないし図５の構成を前提として、羽根車２の羽根板５・・５は図６に示すよう、先端部５ｅの肉厚を薄くし該先端部５ｅにおける外周長さ５ａが可能な限り短くなるよう構成する。この構成により、異物は羽根板５・・５の回転後方側へ逃がされることになり、実施例１ないし４における広い間隙４ａの存在とが相俟って、異物の噛み込みによる羽根車２の拘束（ロック）事故防止効果が一層高められる。また、狭い間隙４ｂの存在により、高揚程ポンプとしての揚液の高所或いは長距離移送が有効に機能することについても、実施例１ないし４の場合と同じである。   Assuming the configuration of FIGS. 1 to 5, the blades 5... 5 of the impeller 2 are made thin as shown in FIG. 6, and the outer peripheral length 5a at the tip 5e is as small as possible. Configure to be shorter. With this configuration, the foreign matter is allowed to escape to the rear side of the rotation of the blades 5.. 5, and in combination with the presence of the wide gap 4 a in the first to fourth embodiments, the impeller 2 due to the biting of the foreign matter. The restraint (lock) accident prevention effect is further enhanced. In addition, the presence of the narrow gap 4b effectively functions as a high-lift pump or a long-distance transfer as a high-lift pump as in the first to fourth embodiments.

本発明構造を備えた水中遠心ポンプの要部縦断側面図であって、羽根車シュラウドの外周面と対向する部位でポンプケーシング内周面の上方部が大径に形成されている事例を示す。It is a principal part vertical side view of the submersible centrifugal pump provided with this invention structure, Comprising: The upper part of the pump casing inner peripheral surface is formed in the large diameter in the site | part facing the outer peripheral surface of an impeller shroud. 本発明構造を備えた水中遠心ポンプの要部縦断側面図であって、ポンプケーシング内周面の上方部が下方部よりも大径に形成されている事例を示す。It is a principal part vertical side view of the submersible centrifugal pump provided with the structure of this invention, Comprising: The upper part of a pump casing inner peripheral surface is shown in the example larger diameter than a lower part. 本発明構造を備えた水中遠心ポンプの要部縦断側面図であって、羽根車外周面の上方部が下方部よりも小径に形成されている事例を示す。It is a principal part vertical side view of the submersible centrifugal pump provided with the structure of this invention, Comprising: The upper part of an impeller outer peripheral surface is shown in the example smaller diameter than a lower part. 本発明構造を備えた水中遠心ポンプの要部縦断側面図であって、ポンプケーシング内周面の上方部が下方部よりも大径に形成され、羽根車外周面の上方部が下方部よりも小径に形成されている事例を示す。It is a principal part longitudinal side view of the submersible centrifugal pump provided with the structure of the present invention, wherein the upper part of the inner peripheral surface of the pump casing is formed to have a larger diameter than the lower part, and the upper part of the outer peripheral surface of the impeller is lower than the lower part. An example of a small diameter is shown. 本発明構造を備えた水中遠心ポンプの要部縦断側面図であって、羽根車シュラウドの外周面が羽根板の外側端面よりも小径に形成されている事例を示す。It is a principal part vertical side view of the submersible centrifugal pump provided with the structure of this invention, Comprising: The outer peripheral surface of an impeller shroud is shown in the example smaller diameter than the outer end surface of a blade board. 本発明構造における羽根車の要部底面図である。It is a principal part bottom view of the impeller in a structure of this invention.

符号の説明Explanation of symbols

１ ポンプケーシング
２ 羽根車
３ シュラウド
４ａ 広い間隙
４ｂ 狭い間隙
５ 羽根板
５ａ 外周長さ
５ｅ 羽根板先端部 DESCRIPTION OF SYMBOLS 1 Pump casing 2 Impeller 3 Shroud 4a Wide gap 4b Narrow gap 5 Blade plate 5a Perimeter length 5e Blade plate tip

Claims (6)

内装される羽根車と同心状に形成されたポンプケーシングの内周面と、前記羽根車の外周面との間に形成される環状間隙（側方クリアランス）が、下方部で狭く上方部で広く形成されていることを特徴とする、水中遠心ポンプの拘束防止構造。 An annular gap (side clearance) formed between the inner peripheral surface of the pump casing formed concentrically with the impeller to be installed and the outer peripheral surface of the impeller is narrow in the lower part and wide in the upper part. A structure for preventing restraint of a submersible centrifugal pump, characterized in that it is formed. ポンプケーシングの内周面が、下方部よりも上方部で大径に形成されていることを特徴とする、請求項１記載の水中遠心ポンプの拘束防止構造。 2. The structure for preventing restraint of an underwater centrifugal pump according to claim 1, wherein the inner peripheral surface of the pump casing is formed to have a larger diameter in the upper part than in the lower part. 羽根車の外周面が、下方部よりも上方部で小径に形成されていることを特徴とする、請求項１記載の水中遠心ポンプの拘束防止構造。 2. The structure for preventing restraint of an underwater centrifugal pump according to claim 1, wherein the outer peripheral surface of the impeller is formed to have a smaller diameter in an upper part than in a lower part. ポンプケーシングの内周面が、下方部よりも上方部で大径に形成され、且つ、羽根車の外周面が、下方部よりも上方部で小径に形成されていることを特徴とする、請求項１記載の水中遠心ポンプの拘束防止構造。 The inner peripheral surface of the pump casing is formed with a larger diameter at the upper part than the lower part, and the outer peripheral surface of the impeller is formed with a smaller diameter at the upper part than the lower part. Item 2. A structure for preventing restraint of the submersible centrifugal pump according to Item 1. ポンプケーシングの内周面が、内装される羽根車と同心状に形成され、羽根車シュラウドの外周面が、ポンプケーシングの内周面上方部と広い間隙を保って対向するよう小径に形成され、該シュラウドの下面より突出する羽根板の外側端面が、ポンプケーシングの内周面下方部と狭い間隙を保って対向するよう形成されていることを特徴とする、水中遠心ポンプの拘束防止構造。 The inner peripheral surface of the pump casing is formed concentrically with the impeller to be installed, and the outer peripheral surface of the impeller shroud is formed with a small diameter so as to face the upper portion of the inner peripheral surface of the pump casing with a wide gap, A structure for preventing restraint of a submersible centrifugal pump, characterized in that an outer end surface of a slat protruding from the lower surface of the shroud is formed to face a lower portion of the inner peripheral surface of the pump casing while maintaining a narrow gap. 羽根車の羽根板は、先端部の肉厚を薄くし該先端部における外周長さが短くなるよう構成したことを特徴とする、請求項１ないし５のいずれか１項に記載の水中遠心ポンプの拘束防止構造。 6. The submersible centrifugal pump according to claim 1, wherein the impeller blade plate is configured such that the thickness of the tip portion is reduced and the outer peripheral length of the tip portion is shortened. Restraint prevention structure.
JP2004049929A 2004-02-25 2004-02-25 Restraint prevention structure for submersible centrifugal pump Expired - Lifetime JP4540363B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004049929A JP4540363B2 (en) 2004-02-25 2004-02-25 Restraint prevention structure for submersible centrifugal pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004049929A JP4540363B2 (en) 2004-02-25 2004-02-25 Restraint prevention structure for submersible centrifugal pump

Publications (2)

Publication Number Publication Date
JP2005240627A true JP2005240627A (en) 2005-09-08
JP4540363B2 JP4540363B2 (en) 2010-09-08

Family

ID=35022635

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004049929A Expired - Lifetime JP4540363B2 (en) 2004-02-25 2004-02-25 Restraint prevention structure for submersible centrifugal pump

Country Status (1)

Country Link
JP (1) JP4540363B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019143585A (en) * 2018-02-23 2019-08-29 株式会社荏原製作所 Centrifugal pump

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55135191U (en) * 1979-03-16 1980-09-25
JPS586990U (en) * 1981-07-07 1983-01-17 株式会社荏原製作所 vortex pump
JPS60139100U (en) * 1984-02-27 1985-09-13 古河鉱業株式会社 pump impeller
JPS6170590U (en) * 1984-10-15 1986-05-14
JPH01294997A (en) * 1988-05-20 1989-11-28 Hitachi Ltd Movable blade pump
JPH0397117U (en) * 1990-01-25 1991-10-04
JPH1089281A (en) * 1996-09-10 1998-04-07 Kawamoto Seisakusho:Kk Pump device
JP2000179489A (en) * 1998-12-16 2000-06-27 Ebara Corp Remained water discharge pump
JP2002021769A (en) * 2000-07-04 2002-01-23 Tsurumi Mfg Co Ltd Suction cover in submergible pump and fixing structure for strainer

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55135191U (en) * 1979-03-16 1980-09-25
JPS586990U (en) * 1981-07-07 1983-01-17 株式会社荏原製作所 vortex pump
JPS60139100U (en) * 1984-02-27 1985-09-13 古河鉱業株式会社 pump impeller
JPS6170590U (en) * 1984-10-15 1986-05-14
JPH01294997A (en) * 1988-05-20 1989-11-28 Hitachi Ltd Movable blade pump
JPH0397117U (en) * 1990-01-25 1991-10-04
JPH1089281A (en) * 1996-09-10 1998-04-07 Kawamoto Seisakusho:Kk Pump device
JP2000179489A (en) * 1998-12-16 2000-06-27 Ebara Corp Remained water discharge pump
JP2002021769A (en) * 2000-07-04 2002-01-23 Tsurumi Mfg Co Ltd Suction cover in submergible pump and fixing structure for strainer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019143585A (en) * 2018-02-23 2019-08-29 株式会社荏原製作所 Centrifugal pump
JP7073137B2 (en) 2018-02-23 2022-05-23 株式会社荏原製作所 Centrifugal pump

Also Published As

Publication number Publication date
JP4540363B2 (en) 2010-09-08

Similar Documents

Publication Publication Date Title
JP2006336642A (en) Centrifugal fan and its frame
EP2484917A1 (en) Anti-vortex device and double-suction vertical pump provided with the anti-vortex device
JP2007162566A (en) Multiblade blower
US8932003B2 (en) Vacuum self-priming pump
KR101535433B1 (en) Submersible pump system with a circular stream preventing apparatus and a turbulent flow preventing apparatus
JP2005240629A (en) Constraint preventing structure of submergible centrifugal pump
JP4540363B2 (en) Restraint prevention structure for submersible centrifugal pump
JP2004353655A (en) Radial impeller
JP4646529B2 (en) Restraint prevention structure for submersible centrifugal pump
JP3862137B2 (en) Turbo hydraulic machine
JP2005240630A (en) Constraint preventing structure of submergible centrifugal pump
US10502226B2 (en) Centrifugal blower
KR102165973B1 (en) Centrifugal pump with vortex preventing means
JP2005320931A (en) Suction cover structure of horizontal shaft pump
JP2006329056A (en) Vertical shaft pump
JP4683851B2 (en) Air lock prevention structure for vertical pump
JP4888871B2 (en) Air lock prevention structure for submersible pumps
JP4454987B2 (en) Submersible vertical pump and vertical residual water drainage pump
JP2005065465A (en) Vertical electric pump
JP2005155393A (en) Volute pump
JPH07103182A (en) Reversing-floating preventer for submersible pump built in column
KR20060129699A (en) Centrifugal blower
JP4821254B2 (en) Non-self-priming pump
JPH0737799B2 (en) Submersible pump casing
JP2000320484A (en) Circumference channel type underwater motor-driven pump

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20061204

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20091218

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20100119

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20100319

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20100622

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20100622

R150 Certificate of patent or registration of utility model

Ref document number: 4540363

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130702

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130702

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20150702

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20150702

Year of fee payment: 5

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

EXPY Cancellation because of completion of term