EP0783923A1 - Méthode et appareil pour la commande d'écoulement d'un liquide de nettoyage traversant un nettoyeur à haute pression - Google Patents

Méthode et appareil pour la commande d'écoulement d'un liquide de nettoyage traversant un nettoyeur à haute pression Download PDF

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Publication number
EP0783923A1
EP0783923A1 EP95120119A EP95120119A EP0783923A1 EP 0783923 A1 EP0783923 A1 EP 0783923A1 EP 95120119 A EP95120119 A EP 95120119A EP 95120119 A EP95120119 A EP 95120119A EP 0783923 A1 EP0783923 A1 EP 0783923A1
Authority
EP
European Patent Office
Prior art keywords
pressure
cleaning liquid
piston
conduit
chamber
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
EP95120119A
Other languages
German (de)
English (en)
Other versions
EP0783923B1 (fr
Inventor
Martin Nikolajsen
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
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 Kew Industri AS filed Critical Kew Industri AS
Priority to EP19950120119 priority Critical patent/EP0783923B1/fr
Priority to DK95120119T priority patent/DK0783923T3/da
Priority to DE1995603063 priority patent/DE69503063T2/de
Publication of EP0783923A1 publication Critical patent/EP0783923A1/fr
Application granted granted Critical
Publication of EP0783923B1 publication Critical patent/EP0783923B1/fr
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 method and an apparatus of the type set forth in the preambles of claims 1 and 4, respectively.
  • a number of different methods and apparatuses are known, all being variants of the type referred to above.
  • methods are known, in which high-pressure cleaners with automatic control valves are used, said control valves having influence on the flow of cleaning liquid and being connected to sensors sensitive to the outlet pressure and/or the volume of flow from the cleaning gun.
  • the adjustment of the desired flow of cleaning liquid takes place on the basis of the changes occurring in the volume of flow and/or the outlet pressure as sensed by the sensors, in that the valves will be controlling the motor-pump unit and set the latter to the desired mode of operation, e.g. full, partial or no flow corresponding to the motor-pump unit being driven without limitation, with partial return flow or full return flow, respectively.
  • the present invention provides a method of controlling the flow of cleaning liquid to be ejected from the cleaning gun, in a simple manner making it possible to operate the high-pressure cleaner in an advantageous manner with varying and - if so desired - extra large volumes of cleaning liquid being supplied to the primary flow path from a secondary flow path, and - not least - with highly reliable operation and under optimal safety conditions in all modes of operation.
  • the present invention provides an apparatus comprising a high-pressure cleaner having a smaller number of components, for this reason being considerably simpler in construction and hence considerably cheaper to manufacture, and in addition more reliable in operation and hence more safe and reliable in use than the previously known high-pressure cleaners.
  • a high-pressure cleaner in which the piston in the automatic control unit in an operational mode, in which the ejection of additional cleaning liquid is desired, may be made to function as a valve for the supply of additional cleaning liquid via a secondary flow path to the cleaning liquid already flowing through the primary flow path, it is ensured in a simple manner partly that additional cleaning liquid is not delivered to the cleaning gun except when it is open, partly that it is sufficient to have one single connection to the injector, resulting in a considerably simplified and safer construction, especially because it is possible with advantage to utilize the pressure-control conduits already present. Further, the control function, previously being taken care of in a number of different single units, is now unified in a single unit.
  • a suitable source of cleaning liquid normally constituted by water, such as an ordinary water supply
  • a high-pressure pump (2) comprising an inlet valve (3), a cylinder (4) with associated movable piston (5), a motor (6) and an outlet valve (7), the latter through a first outlet conduit (8) being connected to the nozzle inlet part of an
  • the embodiment of a high-pressure cleaner shown in the drawing comprises an automatic control unit (20) for regulation and control of the cleaning liquid flowing through, said unit (20) being fluidically connected, partly to the inlet conduit (1) through a first pressure-control conduit (13), partly to an outlet conduit (8) through a second pressure-control conduit (14) as well as to the suction inlet part (37) of the injector (9) through a third pressure-control conduit (15). Electrically, the unit (20) is connected to the power supply circuit of the motor (6) in a manner not shown through a start/stop switch (16).
  • the automatic control unit (20) comprises a generally cylindrical housing (17), which is hollow and likewise having a cylindrical internal shape, one end of which is permanently closed, while the opposite end is closed by a gland (18), the latter advantageously co-operating with a partition (19) and possibly a third chamber (25) constituting the guides for the piston assembly (43).
  • the piston assembly (43) is mainly cylindrical in shape and divides the cavity between the gland (18) and the partition (19) in two spaces or chambers (23, 24), of which the first chamber (23) lies between the internal end wall of the gland (18) and the piston assembly (43), while the second chamber (24) lies between the piston assembly (43) and the partition (19).
  • a switching rod (35) extends, advantageously being permanently secured to one end of the piston assembly (43), while its free end is movable towards and away from an operating member on the start/stop switch (16) so as to cause the switch to make or break the power supply circuit to the motor (6).
  • the opposite end of the piston assembly (43) may advantageously comprise a cylindrical part (36) with reduced diameter co-operating with the cylindrical surface of the third chamber (25) in the housing (17).
  • This third chamber (25) may be made to communicate with the second chamber (24) through a relief channel (27).
  • the second chamber (24) accommodates a spring (28) acting upon the piston assembly (43) with a given force in the direction towards the right in the drawing.
  • the piston assembly (43) is advantageously composed of at least two piston parts (22, 21), of which the first piston part (22), situated in the first chamber (23), may have its end facing the gland (18) adapted to form a loose or fixed connection to the switching rod (35). Consquently, the opposite end faces the second piston part (21), and may advantageously be secured by means of a securing device, such as a split pin or the like. Otherwise, the piston assembly (43) may comprise channels for cleaning liquid to flow through, or else the two piston parts (22, 21) may comprise channels allowing cleaning liquid to flow through.
  • the arrangement of a piston assembly (43) composed of two parts (22, 21) makes it easy to manufacture and assemble the piston assembly, and also to dismantle it in connection with repairs and maintenance, and also makes easy and simple to place in position the remaining components associated with the piston.
  • the piston part (21), in the exemplary embodiment shown constituting the relatively largest part of the piston assembly (43), is generally shaped as a hollow cylinder, the outside and inside walls of which both have a stepped configuration comprising three steps of successively decreasing diameter.
  • the end with the largest diameter is placed to embrace part of the first piston part (22).
  • a check valve is arranged, in the example shown consisting of a spring (29) and a ball (30), of which the spring (29) abuts against both the internal end surface on the first piston part (22) and against the ball, the latter abutting against a seat in the second piston part (21).
  • the spring (29) acts upon the ball (30) with a given force in the direction towards the left in the drawing.
  • the movement of the piston assembly (43) in the cavity in the housing (17) of the control unit (20) may advantageously be defined, partly by the end of the first piston part (22) facing the gland (18), partly by the step surface connecting the end part (36) and the central section of the second piston part (21).
  • the first chamber (23) is connected to the suction inlet part (37) of the injector (9) through the third pressure-control conduit (15)
  • the second chamber (24) is connected to the first outlet conduit (8), i.e. to the pressure side of the pump (2), via the second pressure-control conduit (14), while the third chamber (25) and the connecting duct (26) are connected to the inlet conduit (1) through the first pressure-control conduit (13).
  • the piston-pressure area is largest on the part of the piston assembly (43) facing the chamber (23), i.e. in this case the piston will move towards the left in the drawing.
  • the movements towards the left may be counteracted somewhat by the spring (28) acting upon the piston assembly (43) in the opposite direction.
  • the piston assembly (43) When the transition step surface between the end part (36) and the central section abuts against the partition (19), the piston assembly (43) will have carried out a movement causing the switching rod (35) to be no longer in engagement with or pressing against the operating member of the switch (16), i.e. the power supply circuit for the motor (6) is interrupted and the pump (2) stops.
  • the relief channel (27) During the movement of the piston assembly (43), the relief channel (27) will be connected to the third chamber (25), thus causing a general pressure relief of the whole system in the high-pressure cleaner.
  • the lowering of the pressure is in fact controlled by the spring (28), since the force, with which the spring acts upon the piston assembly (43), decides for how long the relief channel (27) is connected to the pressure-control connection (13, 26) comprising the connecting duct (26) and the first pressure-control conduit (13), in which there is normally a pressure P 1 that is less than P 2 and P 3 , the pressure normally being water-mains pressure, i.e. from 0 to approximately 10 bars.
  • the pressure P 2 will correspond approximately to the output pressure of the pump, normally lying in the interval 80-120 bars, both in the second pressure-control conduit (14) and in the second chamber (24), and a pressure P 3 in the first chamber (23) being less than the pressure P 2 due to the lowering of pressure in the suction inlet (37) of the injector (19) caused by the flow of the cleaning liquid through the latter, hence also in the first chamber (23) via the third pressure-control conduit (15).
  • the inlet pressure of the cleaning liquid will reign.
  • the resultant hydraulic force on the piston assembly (43) will make it remain in the position shown to the right in the drawing.
  • the adjustment means (12) on the cleaning gun (11) for varying the quantity of cleaning liquid to be ejected will be set to a relatively small outflow opening for the cleaning liquid.
  • the pressure is somewhat lower. This is especially desired in situations requiring flushing or rinsing after an effective cleaning at a high pressure, or if it is desired to soak or soften dirt on the surface to be cleaned before high pressure is applied to the cleaning liquid and consequently to the high-pressure cleaner.
  • the quantity of cleaning liquid is, however, experienced as being insufficient, and for this reason it is desirable to be able to increase the quantity of liquid in a simple manner.
  • the outflow adjustment means (12) By adjusting the outflow adjustment means (12) in a manner to increase the outflow opening for the cleaning liquid, the flow velocity of the cleaning liquid will increase, thus creating a lower pressure in the suction inlet of the injector (9) and hence in the third pressure-control conduit (15) and likewise in the first chamber (23).
  • this reduced pressure causes the check valve (29, 30) in the piston assembly (43) to open, thus allowing additional cleaning liquid to flow via the secondary flow path extending from the inlet conduit (1), through the first pressure-control conduit (13), the connecting duct (26) and the third chamber (25), through the inlet duct (32), the check valve (29, 30) and the piston assembly (43), such as through flow ducts (not shown) in the first piston part (22), to the first chamber (23) and from the latter to the cleaning gun (11) via the third pressure-control conduit (15), the injector (9) and the latter's suction inlet (37) as well as the second outlet conduit (10).
  • the magnitude of the lower pressure required to open the check valve (29, 30) can be determined by the characteristics of the spring (29), and will also depend on the pressure P 1 of the cleaning liquid reigning in the inlet conduit (1).

Landscapes

  • Cleaning By Liquid Or Steam (AREA)
EP19950120119 1995-12-19 1995-12-19 Méthode et appareil pour la commande d'écoulement d'un liquide de nettoyage traversant un nettoyeur à haute pression Expired - Lifetime EP0783923B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP19950120119 EP0783923B1 (fr) 1995-12-19 1995-12-19 Méthode et appareil pour la commande d'écoulement d'un liquide de nettoyage traversant un nettoyeur à haute pression
DK95120119T DK0783923T3 (da) 1995-12-19 1995-12-19 Fremgangsmådeapparat til styring af strømmen af rensevæske gennem en højtryksrenser
DE1995603063 DE69503063T2 (de) 1995-12-19 1995-12-19 Verfahren und Vorrichtung zum Regeln der Strömung einer Reiningungsflüssigkeit durch einen Hochdruckreiniger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19950120119 EP0783923B1 (fr) 1995-12-19 1995-12-19 Méthode et appareil pour la commande d'écoulement d'un liquide de nettoyage traversant un nettoyeur à haute pression

Publications (2)

Publication Number Publication Date
EP0783923A1 true EP0783923A1 (fr) 1997-07-16
EP0783923B1 EP0783923B1 (fr) 1998-06-17

Family

ID=8219900

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950120119 Expired - Lifetime EP0783923B1 (fr) 1995-12-19 1995-12-19 Méthode et appareil pour la commande d'écoulement d'un liquide de nettoyage traversant un nettoyeur à haute pression

Country Status (3)

Country Link
EP (1) EP0783923B1 (fr)
DE (1) DE69503063T2 (fr)
DK (1) DK0783923T3 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012217978A (ja) * 2011-04-14 2012-11-12 Ryobi Ltd 高圧洗浄機
CN107310532A (zh) * 2017-03-10 2017-11-03 南安市申达鑫通商贸有限公司 一种洗车设备
EP2879780B1 (fr) * 2012-08-02 2018-04-25 Briggs & Stratton Corporation Nettoyeur haute-pression
EP3227034A4 (fr) * 2014-12-05 2018-07-25 Briggs & Stratton Corporation Dispositifs de lavage sous pression, comprenant des pompes à jet
CN109211725A (zh) * 2017-07-08 2019-01-15 北京工标传感技术有限公司 一种音叉密度计的清洁装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012219621A1 (de) * 2012-10-26 2014-04-30 Robert Bosch Gmbh Kolbenpumpe
CN104741334B (zh) * 2015-04-10 2016-10-19 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
CN109930531A (zh) * 2019-03-29 2019-06-25 重庆进发物业管理有限公司 节水型喷水枪
CN112718658B (zh) * 2020-12-17 2022-08-19 广西荃鸿农业科技有限公司 一种植物种子清理烘干装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263196A1 (fr) * 1985-08-29 1988-04-13 WAP Reinigungssysteme GmbH & Co. Appareil de nettoyage à haute pression
DE8814243U1 (fr) * 1988-11-14 1989-01-12 K.E.W. Industri A/S, Hadsund, Dk

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263196A1 (fr) * 1985-08-29 1988-04-13 WAP Reinigungssysteme GmbH & Co. Appareil de nettoyage à haute pression
DE8814243U1 (fr) * 1988-11-14 1989-01-12 K.E.W. Industri A/S, Hadsund, Dk

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012217978A (ja) * 2011-04-14 2012-11-12 Ryobi Ltd 高圧洗浄機
EP2879780B1 (fr) * 2012-08-02 2018-04-25 Briggs & Stratton Corporation Nettoyeur haute-pression
US10654054B2 (en) 2012-08-02 2020-05-19 Briggs & Stratton Corporation Pressure washers including jet pumps
EP3227034A4 (fr) * 2014-12-05 2018-07-25 Briggs & Stratton Corporation Dispositifs de lavage sous pression, comprenant des pompes à jet
US10870135B2 (en) 2014-12-05 2020-12-22 Briggs & Stratton, Llc Pressure washers including jet pumps
CN107310532A (zh) * 2017-03-10 2017-11-03 南安市申达鑫通商贸有限公司 一种洗车设备
CN107310532B (zh) * 2017-03-10 2019-05-10 南京林顿自动化设备有限公司 一种洗车设备
CN109211725A (zh) * 2017-07-08 2019-01-15 北京工标传感技术有限公司 一种音叉密度计的清洁装置
CN109211725B (zh) * 2017-07-08 2023-09-19 北京工标传感技术有限公司 一种音叉密度计的清洁装置

Also Published As

Publication number Publication date
DE69503063T2 (de) 1998-10-29
DE69503063D1 (de) 1998-07-23
EP0783923B1 (fr) 1998-06-17
DK0783923T3 (da) 1998-12-07

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