EP0790866B1 - Hochdruckreinigungsgerät mit einer automatischen steuereinheit - Google Patents

Hochdruckreinigungsgerät mit einer automatischen steuereinheit Download PDF

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Publication number
EP0790866B1
EP0790866B1 EP95902064A EP95902064A EP0790866B1 EP 0790866 B1 EP0790866 B1 EP 0790866B1 EP 95902064 A EP95902064 A EP 95902064A EP 95902064 A EP95902064 A EP 95902064A EP 0790866 B1 EP0790866 B1 EP 0790866B1
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EP
European Patent Office
Prior art keywords
pressure
chamber
piston
piston rod
opening
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.)
Expired - Lifetime
Application number
EP95902064A
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English (en)
French (fr)
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EP0790866A1 (de
Inventor
Jan Strandgaard
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.)
Kew Industri AS
Original Assignee
Kew Industri AS
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Filing date
Publication date
Application filed by Kew Industri AS filed Critical Kew Industri AS
Publication of EP0790866A1 publication Critical patent/EP0790866A1/de
Application granted granted Critical
Publication of EP0790866B1 publication Critical patent/EP0790866B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B08B3/026—Cleaning by making use of hand-held spray guns; Fluid preparations therefor

Definitions

  • the present invention relates to a high-pressure cleaner of the kind comprising
  • High-pressure cleaners in which a bypass valve connects the suction side of the pump with its delivery side and is controlled by the pressure in a conduit leading from a flow-sensitive device in the conduit leading to the cleaning gun, are disclosed in the International Application No. WO88/01912, the European Patent Application No. 0 407 812 A1, the German Patent publication No. 41 22 527 C1 and the German Utility Model publication No. G 93 15 9609.
  • the point of departure for the present invention is a combination of the principles disclosed in the publications referred to above with a switch in the power circuit for the pump, adapted to control the operation of the pump in dependence of the position of the valve member in the bypass valve, this combination representing an unpublished stage in the development of the high-pressure cleaner according to the present invention.
  • the spring-biasing of the piston is provided by at least two helical compression springs placed in the second chamber, of which at least one spring acts upon the piston solely along a part of the total path of movement of the piston.
  • the pressure-release valve is constituted by
  • the sealing function between the cylindrical wall in the opening and said valve member is effected by an O-ring situated in a circumferential groove in the cylindrical surface.
  • the high-pressure cleaner shown diagramatically in Figure 1 comprises
  • the parts 1-11 mentioned above function in a manner known in principle in causing a jet of liquid to be ejected from the cleaning gun 11, this gun for control purposes having a manually operable valve (not shown) capable of interrupting the connection between the second high-pressure conduit 10 and the gun's nozzle.
  • the high-pressure cleaner diagrammatically shown in Figure 1 also comprises an automatic control unit 12, connected hydraulically
  • the automatic control unit 12 is connected through an ON/OFF switch 16 connected in a manner not shown to the supply circuit of the drive motor 6.
  • the automatic control unit 12 shown in Figures 1-4 comprises a substantially cylindrical housing 17 that is hollow and permanently closed at one of its ends, while the opposite end is closed by a gland 18 co-operating with a stationary transverse wall 19 to act as a guide for a piston rod 20, to which a piston 21 is secured.
  • the piston 21 divides the space between the gland 18 and the transverse wall 19 to form two chambers, i.e. a first chamber 22 between the gland 18 and the piston 21 and a second chamber 23 between the piston 21 and the transverse wall 19.
  • the piston rod 21 comprises an extension 24, the free end of which is capable of abutting against the operating member 25 of the ON/OFF switch 16 already referred to above.
  • the contacts of the switch 16 are so arranged, that electrical power may be supplied to the drive motor 6 in the pump assembly 2 when the operating member 25 is depressed as indicated in Figure 2.
  • the space within the housing 17 to the left of the transverse wall 19 constitutes a pressure-release chamber 26 adapted to communicate with the second chamber 23 when the piston rod 21 is in the position shown in Figure 3, in which a pressure-release channel 27 formed in the piston rod 21 connects the two chambers with each other.
  • the second chamber 23 accommodates two helical compression springs, i.e. a first spring 28 constantly urging the piston 21 towards the gland 18, and a second spring 29 also urging the piston 21 towards the gland 18, but not further than to the position shown in Figure 3, so that only the first spring 28 acts on the piston 21 in the position shown in Figures 2 and 4.
  • a stop abutment 30 limits the extent of movement of the piston 21 towards the right in the drawing, and the extension 24 of the piston rod 20 extending through the gland 18 is preferably so dimensioned that under no circumstances will the operating member 25 be depressed beyond its normal contact-connecting position.
  • the first chamber 22 is connected to the suction inlet in the injector 9 through the control-pressure conduit 15, the second chamber 23 is connected to the first high-pressure conduit, i.e. the pressure side of the pump, through the second pressure-release conduit 14, while the pressure-release chamber 26 is connected to the supply conduit 1 through the first pressure-release conduit 13.
  • the pump pressure P2 is higher than the control pressure P3 in the control-pressure conduit between the suction inlet of the injector 9 and the first chamber 22 in the control unit 12.
  • the control pressure P3 is - due to the intense flow of liquid from the pump assembly 2 to the cleaning gun 11 through the injector 9 - so low that the piston 21 is urged towards the gland 18 against the stop abutment 30, thus holding the switch 16 in the contact-connecting position enabling electrical power to be supplied to the drive motor 6.
  • an auxiliary starting contact (not shown) may be necessary to supply electrical energy to the drive motor 6 until such flow has been established.
  • Such a contact could be a "short-make" contact operated by the trigger in the cleaning gun 11.

Landscapes

  • Cleaning By Liquid Or Steam (AREA)
  • Reciprocating Pumps (AREA)

Claims (4)

  1. Hochdruckreiniger des Typs, umfassend:
    a) einen Einlaß (1) für Flüssigkeit unter einem relativ niedrigen Druck,
    b) eine Hochdruckpumpe (2), deren Saugseite mit dem Flüssigkeitseinlaß (1) verbunden ist und deren Druckseite (8) mit
    c) dem Antriebsdüseneinlaß in einer Einspritzeinrichtung (9) verbunden ist, deren Auslaß mit einer Reinigungspistole (11) verbunden ist, und
    d) eine automatische Regelungseinheit (12), umfassend:
    d1) eine Zylinderkammer (22, 23), in der ein federbelasteter (28, 29) Kolben (21) abdichtend und verschiebbar gelagert ist und daher die Zylinderkammer in zwei Teilkammern (22, 23) teilt, von denen die erste (22) mit dem Saugeinlaß der Einspritzeinrichtung (9) und die zweite (23) mit der Druckseite (8) der Pumpe (2) verbunden ist,
    d2) eine Druckentspannungskammer (26), die von der zweiten Kammer (23) durch eine Abteilung (19) mit einer durch diese verlaufenden Öffnung (33) getrennt ist, und
    d3) eine Kolbenstange (20), die an dem Kolben (21) befestigt ist und sich von dem letztgenannten teils durch die erste Kammer (22) und abdichtend und verschiebbar (24) durch eine Öffnung in der Außenwand (18) der ersten Kammer (22) für einen Eingriff mit dem Betriebselement (25) eines Schalters (16) erstreckt, der in die Energieversorgungsschaltung des Antriebsmotors (6) für die Pumpe eingesetzt ist, und sich teils durch die zweite Kammer (23) und verschiebbar durch die Öffnung (33) in der Abteilung (19) erstreckt, wobei sie mit dieser Öffnung zusammenwirkt, um ein Druckentspannungsventil (33, 27) zu bilden, wobei das Ventil geschlossen ist, wenn sich die Kolbenstange (20) in einer ersten Stellung (Fig. 2) befindet, in der die erste Kammer (22) relativ klein ist und die Kolbenstange (20) den Schalter (16) in einer Kontaktverbindungsstellung hält, und offen ist, wenn sich die Kolbenstange (20) in einer zweiten Stellung (Fig. 3) befindet, in der die erste Kammer (22) größer als in der ersten Stellung ist und die Kolbenstange (20) den Schalter (16) nicht in der Kontaktverbindungsstellung hält,
    dadurch gekennzeichnet,
    e) daß die wirksamen Flächenbereiche auf beiden Seiten des Kolbens (21), die auf der Seite, die zu der ersten Kammer (22) weist, größer als auf der gegenüberliegenden Seite sind, und die Eigenschaften der Feder oder der Federn (28, 29), mit denen der Kolben (21) vorgespannt ist, gegenseitig auf eine solche Art und Weise abgestimmt sind, daß, wenn im wesentlichen gleiche gemäßigte Drücke in den beiden Kammern (22, 23) vorherrschen, der Kolben (21) und mit ihm die Kolbenstange (20) eine Gleichgewichtsstellung oder dritte Stellung (Fig. 4) einnehmen wird, die zwischen den ersten und zweiten Stellungen liegt, und in der das Druckentspannungsventil (33, 27) geschlossen ist und die Kolbenstange (20) den Schalter (16) nicht in der Kontaktverbindungsstellung hält.
  2. Hochdruckreiniger nach Anspruch 1,
    dadurch gekennzeichnet, daß die Federvorspannung des Kolbens (21) durch zumindest zwei schraubenförmige Druckfedern (28, 29) vorgesehen wird, die in der zweiten Kammer (23) angeordnet sind, von denen zumindest eine Feder (29) auf den Kolben ausschließlich entlang eines Teiles des Gesamtweges der Bewegung des Kolbens wirkt.
  3. Hochdruckreiniger nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, daß das Druckentspannungsventil (33, 27) gebildet wird durch:
    a) die Öffnung (33), die sich durch die Abteilung (19) erstreckt und eine zylindrische Oberfläche aufweist, und
    b) ein zylindrisches Ventilelement, das an der Kolbenstange (20) befestigt oder einstückig mit dieser ausgebildet ist und verschiebbar und abdichtend mit der zylindrischen Oberfläche in der Öffnung (33) zusammenwirkt, wobei das Ventilelement einen Druckentspannungskanal (27) aufweist, der derart ausgebildet ist, daß er die zweite Kammer (23) mit der Druckentspannungskammer (26) ausschließlich in der zweiten Stellung (Fig. 3) verbindet.
  4. Hochdruckreiniger nach Anspruch 3,
    dadurch gekennzeichnet, daß die Dichtungsfunktion zwischen der zylindrischen Wand in der Öffnung (33) und dem Ventilelement durch einen O-Ring (31) bewirkt wird, der in einer Umfangsnut (32) in der zylindrischen Oberfläche liegt.
EP95902064A 1994-11-07 1994-11-07 Hochdruckreinigungsgerät mit einer automatischen steuereinheit Expired - Lifetime EP0790866B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DK1994/000418 WO1996014171A1 (en) 1994-11-07 1994-11-07 High-pressure cleaner with an automatic control unit

Publications (2)

Publication Number Publication Date
EP0790866A1 EP0790866A1 (de) 1997-08-27
EP0790866B1 true EP0790866B1 (de) 1998-08-26

Family

ID=8154942

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95902064A Expired - Lifetime EP0790866B1 (de) 1994-11-07 1994-11-07 Hochdruckreinigungsgerät mit einer automatischen steuereinheit

Country Status (5)

Country Link
EP (1) EP0790866B1 (de)
AU (1) AU1106095A (de)
DE (1) DE69412868T2 (de)
DK (1) DK0790866T3 (de)
WO (1) WO1996014171A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104741334A (zh) * 2015-04-10 2015-07-01 江苏苏美达五金工具有限公司 一种多种工作模式的高压清洗机

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29900463U1 (de) * 1999-01-14 2000-02-24 Wap Reinigungssysteme Regelsicherheitsblock für Hochdruck- und Dampfstufe
ITPD20030053U1 (it) * 2003-07-10 2005-01-11 Lavorwash Spa Struttura di pompa idraulica a pistoni assiali
CN100500308C (zh) * 2005-02-28 2009-06-17 中国矿业大学 电厂凝汽器高压水射流在线清洗机器人技术
CN102755971B (zh) * 2012-07-18 2014-05-07 梁福根 高压清洗机气囊球压力控制器
CN104948407B (zh) * 2015-06-24 2018-04-27 宁波富斯乐机械制造有限公司 可增流量高压柱塞泵
CN111659657B (zh) * 2019-03-07 2022-03-22 苏州宝时得电动工具有限公司 高压清洗机

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4182354A (en) * 1978-05-02 1980-01-08 U.S. ParaPlate Corporation Method and apparatus for flow diversion in a high pressure fluid delivery system
US4385640A (en) * 1980-08-25 1983-05-31 Thomas D. McKane Hydraulic unloader
DK149739C (da) * 1983-11-25 1987-02-16 Westergaard Knud Erik Haejtryksrenser med trykstyret omlaebsventil
DE3800377C1 (en) * 1988-01-08 1989-06-22 Wap Reinigungssysteme Gmbh & Co, 7919 Bellenberg, De By-pass valve for a high-pressure cleaning appliance
US5320280A (en) * 1992-06-19 1994-06-14 Graco Inc. Pneumatically controlled spraying system having a diaphragm-operated switch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104741334A (zh) * 2015-04-10 2015-07-01 江苏苏美达五金工具有限公司 一种多种工作模式的高压清洗机

Also Published As

Publication number Publication date
DK0790866T3 (da) 1999-05-25
DE69412868T2 (de) 1999-01-14
EP0790866A1 (de) 1997-08-27
WO1996014171A1 (en) 1996-05-17
DE69412868D1 (de) 1998-10-01
AU1106095A (en) 1996-05-31

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