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
  • B08B3/003—Cleaning involving contact with foam
• • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
  • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
  • F16K11/08—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks
  • F16K11/085—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks with cylindrical plug
  • F16K11/0856—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks with cylindrical plug having all the connecting conduits situated in more than one plane perpendicular to the axis of the plug
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B2203/00—Details of cleaning machines or methods involving the use or presence of liquid or steam
  • B08B2203/02—Details of machines or methods for cleaning by the force of jets or sprays
  • B08B2203/0217—Use of a detergent in high pressure cleaners; arrangements for supplying the same

Definitions

• the present invention pertains to a cleaning device, particularly for use in the food manufacturing industries, for example for cleaning heavily soiled surfaces in the food processing area, for instance in the meat and fish processing industries for vegetables processing or in the pastry industry.
• the cleaning device according to the invention may also be used for cleaning cars, tractors and other agricultural machines, which often get heavily soiled during use.
• a device which makes it possible, b starting with, on the one hand, water under pressure and, on the other hand, water, to which chemical or bactericidal products have been added, to produce foam intended for cleaning surfaces or objects
• the device consists of two consecutive chambers, in the first chamber compressed air enters b means of a tube pierced with holes. Water under pres- sure, to which chemical product have been added, enters by means of the tube. Then the mixture of air under pressure and of water under pressure produces foam. This foam is conveyed into a decompression chamber which completes the mixing of the products. The volume of the chambers is calculated to obtain an optimum quality of the foam.
• the device comprises a housing body having a first inlet for feeding pressurized water; a propulsion jet positioned behind the inlet and in a direction of flow; a collection jet positioned behind the propulsion jet, which is flow-connected with a second inlet for feeding a chlorine-free alkaline foam cleaning agent, and a third inlet for feeding a hydrogen peroxide solution; and a turbulence chamber into which an elongated jet body of the collection jet extends, the turbulence chamber being fitted with a chamber inlet for feeding compressed air into the chamber, such that a hydrogen peroxide foam is formed from a solution formed upon dosing an effective amount of the hydrogen per- oxide solution into the chlorine-free alkaline foam cleaner at a maximum of 80 seconds prior to contact of the hydrogen peroxide foam with a surface to be cleaned, the turbulence chamber further having a chamber outlet, through which the hydrogen peroxide foam leaves the chamber to contact th surface, the chamber
• a mobile foam producing unit which includes a first hose and a first hose assembly, and a second hose assembly. Water is provided to the mobile foam producing unit by a supply hose.
• a foam gun provides for the dis-- pensing of foam, in a first mode, a sanitizer gun dispenses a sanitizing solution together with water, and in a second mode, i.e. a rinse mode, only water is dispensed from the sanitizer gun.
• a cleaning device which device can supply cleaning fluid alone or mixed with water, air under pressure and chemicals. It has a mixing and dosing unit, which has input lines for the components, and an output line for the components to supply them singly or mixed. There is a setting device between the input and output Sines.
• the setting device can mix all the components supplied and supply them indefinitely or in a dosed pattern, with at least one of the components blocked off.
• the setting device may be in the form of a turning roller with a number of channels in it.
• ft is thus an object of the present invention to provide a cleaning unit, which is more versatile than those known in the art, and wherein the change between the different cleaning operations can be performed quickly - without a change of equipment ⁇ and in an error-free manner.
• a cleaning device comprising the following main parts:
• a mixing unit fluidly connected to the water inlet, and the air outlet of the compressor, the mixing unit further comprising a fluid outlet, a first and a second input iine for a first and a second cleaning agent,
• a movable controlling member having:
• Cleaning procedures used in the food producing industry typically involve an initial flushing/wetting of the contaminated area, surfaces, processing machines and other equipment, which needs to be cleaned. This flushing is usually followed by the application of foam to said area, surfaces, processing machines and other equipment. This foam is then flushed away after a certain period of time. Finally, said area, surfaces, processing machines and other equipment are disinfected by the application of a disinfectant, in some cases this disinfectant is removed by the flushing with clean water. This means that there is typically a successive change between the following procedures:
• cleaning devices or mixing units In order to facilitate a change between all these procedures, several cleaning devices or mixing units must usuall be employed.
• one device for the provision of water e.g, a water hose of high pressure cleaner, one device for foaming, and one device for the provision of the disinfectant.
• a single cleaning device having a mixing unit thai is f!uidl connected to the outlet of a water pump and the air outlet of a compressor, and a movable controlling member, which can be placed in a first position, only allowing passage of pressurized water from the water inlet to the outlet of the mixing unit, and a second position, only allowing passage of pressurized water from the water inlet and a first cleaning agent from the first input line to the outlet of the mixing unit, and a third position, only allowing passage of pressurized water from the water inlet and a second cieaning agent from the second input line, and pressurized air from the air outlet of the compressor to the outlet of the mixing unit for the provision of foam, it is possible to successively change between all Of the above-mentioned cleaning processes by changing the position of the movable controlling member.
• the first cleaning agent is a disinfectant and the second cleaning agent is a foaming agent
• an oper- afor movable merely needs to switch the controlling member successively between the following positions: first, third, first, second, first, in order to perform the above-men- ironed cleaning procedure.
• the con- trolling member comprises at least three bores placed in such a way relative to each other that passage of pressurized water from the water inlet to the outlet of the mixing unit is only aliowed when the controlling member is in the first position, or passage of pressurized water from the water inlet and a first cleaning agent from the first input line to the outlet of the mixing unit is only allowed when the controlling member is in the second position, or passage of pressurized water from the water inlet and a second cieaning agent from the second input line to the outlet of the mixing unit for the provision of foam is oniy allowed when the controlling member is in the third position.
• the controlling member comprises a cylindrical part, and said bores are placed in such a way relative to each other in said cylindrical part that passage of pressurized water from the water inlet to the outlet of the mixing unit, or passage of pressurized water from the water inlet and a first cieaning agent from the first input line to the outlet of the mixing unit, or passage of pressurized water from the water inlet and a second cieaning agent from the second input line to the outlet of the mixing unit for the provision of foam, is provided by turning said controlling member betwee the first, second and third position.
• a device which is simple and reliable to operate because the movable mem- ber may be switched between the three positions by simply turning/rotating the cylindrical part relative to its cylinder axis.
• the mixing unit comprises a first and a second injector, wherein:
• the first injector is fluidfy connected to the water inlet, the first input line for the first cleaning agent, and the outlet of the mixing unit when th controliing member is in its second position, such thai - during use - an under pressure is created in said first injector, which draws the first cieaning agent into said first injector, where it is mixed with wafer and then expelled through the outlet of the mixing unit, and
• the second injector is fluidl connected to the water inlet, the second input line for the second cleaning agent, and the outlet of the mixing unit when the con- trolling member is in its third position, such that - during use - an under pressure is created in said second injector, which draws the second cleaning agent into said second injector, where it is mixed with water and then expeiied through the outlet of the mixing unit.
• the cleaning device further comprises a connector, said connector being fluidly connected to the water inlet and the outlet of the mixing unit when the controiiing member is in the first position.
• the connector is preferably embodied as a pipe, but could also be embodied as an injector.
• said connector is fluidly connected to the air outlet of the compressor and the outlet of the mixing unit when the controlling member is in the third position.
• said connector is preferably embodied as a pipe, or bore in the mixing unit, having a relatively large cross sectional area as com- pared to the maximal - and average - cross sectional area of the individual injectors.
• the connector is placed between said first and second injectors in the mixing unit.
• the controlling member is equipped with a handle for manually switching said controiiing member between the first, second and third positions.
• the controiiing member may be operafively connected to electrical and/or pneumatic actuating means for switching said controiiing member between the first, second and third positions.
• the handle is operative!y connected to a cam device having a cam, which is configured to en- gage an electrical switch, activating the compressor when the controlling member is switched to its third position.
• a cam device having a cam, which is configured to en- gage an electrical switch, activating the compressor when the controlling member is switched to its third position.
• said cam disengages said electrical switch when the controlling member is switched from the third position to any of the other positions, whereby the compressor is de-activated.
• the compressor is automatically switched off when the control- ling member is in a position wherein no foam is to be produced.
• the handle may be operative!/ connected to a cam device having a cam, which is configured to engage a pneumatic (or possibly electrical) switch for opening for the flow of air from the air outlet of the compressor to the air inlet of the mixing unit when the controlling membe is switched to its third position.
• said cam disengages said pneumatic (or possibly electrical) switch when the controlling member is switched from the third position to any of the other positions, whereby the flow of air from the air out- let of the compressor to the air inlet of the mixing unit is interrupted, i.e. stopped.
• the compressor forms part of the cleaning device.
• the water inlet is to be f!uid!y connected to an outlet of a water pump, said water pump having an inlet that is fiuidiy connected to the water supply for the provision of pressurized water having a water pressure greater than that provided by the water supply.
• said water pump forms part of the cleaning device.
• the mixing unit and the movable controlling member are placed inside a common housing, and the compressor is placed at a different location.
• the compressor, the mixing unit, and the movable controliing member are piaced inside a common housing.
• the water pump, the compressor, the mixing unit, and the movable controlling member are piaced inside a common housing.
• the housing comprises a cover part, which can be opened in order to provide access to the water pump, the compressor, the mixing unit, and the movable controlling member, e.g. for maintenance work.
• the mixing unit and the movable controlling member are placed inside a common housing, whereas the water pump and the compressor are placed at another location.
• T e compressor and water pum may be placed at a central location distant from the housing, wherein the mixing unit and the movable controlling member are placed.
• said water pump may comprise a plurality of addi- tional outputs, which are f!uidly connected to a plurality of additional mixing units, and wherein said compressor may comprises a plurality of additional air outputs also fluidly connected: to said plurality of additional mixing units.
• all components of the cleaning device, except the water pump and the compressor are piaced inside the housing.
• the water pump and compressor may therefore be placed at a central location and from this central location be operative!y connected to a plurality of mixing units placed in a respective plurality of housings.
• the housing which housing does note comprise the water pump and compressor) comprises a cover pari, which can be opened in order to provide access to the mixing unit and the movable controlling member, e.g. for maintenance work.
• the housing and/or cover part may comprise packing elements in order to provide a water and moisture proof sealing between said housing and cover part when said cover part is closed.
• said housing is placed on a wheeled chassis, whereby a mobile cleaning device is provided.
• the provided pressurized water for example at the pump outlet, has a pressure of between 5 and 80 bar, preferably between 10 bar and 60 bar, even more preferably between 20 bar and 60 bar.
• the air pressure provided by the compressor is preferably around 5 bar.
• Water vapor can carry contagious/infectious gems, which can pose a real health hazard to the operators performing cleaning work in for example the food industry.
• water pressure belo 60 bar, it is assured that the health risk associated with water vapor-carried infections is minimized, while at the same time providing sufficient pressure in order to suck up the first or second cleaning agents for the cleaning or disinfection purposes.
• the provided pressurized water for example at the pump outlet, has a pressure of between 5 and 40 bar, preferably between 10 bar and 40 bar, even more preferably between 15 bar and 40, or between 20 bar and 40 bar, or between 25 and 60 bar, preferably between 30 bar and 60 bar, even more preferably between 15 bar and 60, or between 35 bar and 60 bar, or between 5-10 bar, and/or 10-20 bar, and/or 20-30 bar, and/or 30-40 bar, and/or 40-50 bar, and/or 50-60 bar, and/or 60-70 bar, and/or 70- 80 bar.
• the water provided by the water supply to the inlet of the water pump has a pressure of less than 10 bar, preferably less than 8 bar, even more preferably less than 5 bar.
• the pressurized air provided has a pressure that is lower than the pressure of the pressurized water, preferably substantially lower than the pressure of the pressurized water.
• the pressurized air provided has a pressure of less than 5 bar, more preferable a pressure of less than 10 bar.
• the mixing device is manufactured from a metal alloy, e.g. stainless steel.
• the movable controlling member is also preferably manufactured from a metal alloy, such as stainless steel.
• the metal surface of the mixing unit which during use is in abutting contact with a surface of the movabie controlling member, is coated with a protective coating.
• the metal surface of the movabie controlling member which during use is in abutting contact with a surface of the mixing unit, is coated with a protective coating
• said coating is a diamond-like carbon coating (a so-called DLC coating).
• DLC diamond-like carbon coating
• a so-called DLC coating exists in seven different forms of amorphous carbon materials, which display some of the typical properties of diamond. They all contain a significant amount of sp s hybridized carbon atoms. The reason why there are different types is that even diamonds can be found in two crystalline poly ypes. The usual one has its carbon atoms arranged in a cubic lattice, while the very rare one (lonsdaleite) has a hexagonal iattice.
• DLC coatings can be made that at the same time are amorphous, flexible, and yet purely sp 3 bonded "diamond".
• the hardest, strongest, and slickest is such a mixture known as tetrahedral amorphous carbon, or ia-C.
• ia-C tetrahedral amorphous carbon
• a coating of only 2 pm thickness of ia-C increases the resistance of common (i.e. type 304) stainless steel against abrasive wear, changing its lifetime in. such service from one week to 85 years.
• Such ia-C can be considered to be the "pure" form of DLC since if consists only of sp 3 bonded carbon atoms.
• Fillers such as hydrogen, graphitic sp 2 carbon, and metals are used in the other forms to reduce production expenses or to impart other desirable properties.
• the application of a DLC coating in. accordance with this embodiment of the invention thus significantly increases the lifetime of the cleaning device according to the invention as well as significantly reduces the leakage due to abrasive wear to in practice a non-existing !evel.
• Fig. 1 shows an embodiment of a cleaning device according to the invention
• Fig. 2 shows the same embodiment of a cleaning device as in Fig. 1, but with a cover attached to it,
• Fig. 3 shows a perspective view of a mixing unit
• Fig. 4a-4c shows a semi transparent view of a mixing unit as illustrated in Fig. 3
• Fig. 5 shows an embodiment of a movable controlling member
• Fig. 6 shows a partial cross sectional view of a mixing unit.
• FIG. 1 shows an embodiment of a cleaning device 2 according to the invention.
• the illustrated cleaning device 2 comprises a water pump 4, having an inlet 6 to be connected to a water supply (not shown), and an outle 8 for the provision of pressurized water.
• the cleaning device 2 also comprises a compressor 0, having an air inlet 12, and an air outlet 14 for the provision of pressurized air.
• a compressor 0 having an air inlet 12, and an air outlet 14 for the provision of pressurized air.
• the cleaning device 2 could be embodied without a compressor 10 or a water pump 4, or without both.
• either the compressor 0 or the water pump 4 - or both - could form part of the device, but be placed at a different location.
• This mixing unit 16 is shown. This mixing unit 16 is fiuidiy connected to the outlet 8 of the water pump 4 and the air outlet 14 of the compressor 10 via the air inlet 15 of the mixing unit 16.
• the mixing unit 16 further comprises a fluid outlet 18, a first input Sine 20, and a second input line 22 for a first and a second cleaning agent.
• the cleaning device 2 is connected to an electrical power supply via the wire 23 in order to supply electricai power to the water pump 4 and the compressor 10.
• the water pump 4, the compressor 10, the mixing unit 16, and all other components of the device 2 are placed inside a housing 24.
• the housing 24 comprises a cover part 26, which can be opened in order to provide access to the water pump 4, the compressor 10, the mixing unit 16, and other components for maintenance work.
• the housing 24 and/or cover part 26 may comprise packing elements 28 (see Fig. 1 ) in order to provide a water and moisture proof sealing between said housing 24 and cover part 26 when said cover part 26 is closed.
• packing elements 28 see Fig. 1
• Fig. 2 Also shown in Fig. 2 are the three modes of the illustrated cleaning device 2. These three modes correspond to a foaming mode 30, a rinsing mode 32, and a sanitizing mode 34. Sn the foaming mode 30 a cleaning agent is mixed with water and ai from the compressor 10 in order to produce foam, which is expelled through the outlet 18 of the mixing unit 16. In the rinsing mode only water is passed through the mixing unit 16, and in the sanitizing mode a disinfectant is expelled through the outlet 18 of the mixing unit 16.
• the illustrated cleaning device 2 is a wall mountable device 2, but it could in alternative embodiments be placed on a wheeled chassis, whereby a mobile cleaning device is provided.
• the pressurized water provided by the water pump 4, i.e. at the pump outlet 8, has a pressure of between 5 bar and 60 bar, preferably between 10 bar and 60 bar, even more preferably between 20 bar and 60 bar.
• pressure is provided b the water pump 4 in order to suck up the first cleaning agent and the second cleaning agent, even when air pressure provided by the compressor 10 (for the foaming) is supplied to the connector (not shown in Fig. i).
• the a r pressure provided by the compressor 10 is preferabl around 5-10 bar, Water vapor can carry contagious/infectious gems, which can pose a real health hazard to the operators performing cleaning work in for example the food industry. However, by keeping the water pressure below 60 bar or below 40 bar, it is assured that the health risk associated with water vapor carried infections is minimized, while at the same time providing sufficient pressure in order to suck up the first or second cleaning agent for cleaning or disinfection purposes.
• the water provided by the water supply to the inlet 6 of the water pump 4 has a pressure of less than 10 bar, preferably less than 8 bar.
• Fig. 3 shows a perspective view of a mixing unit 16.
• a movable controlling member see e.g. Figs. 4-5 for further information
• a handle 36 for manually switching said controliing member between a first, second and third position.
• the handle 36 is operatively connected to a cam device 38 having a cam 40, which is configured to engage an electrical switch 42 activating the compressor 10 when the controlling member is switched to its third position.
• a cam device 38 having a cam 40, which is configured to engage an electrical switch 42 activating the compressor 10 when the controlling member is switched to its third position.
• Said cam 40 disengages said electrical switch 42 when the controlling member is switched from the third position to any of the other positions, whereby the compressor 10 is de-activated.
• the compressor 10 is automatically switched off when the controlling member is in a position wherein no foam is to be produced.
• the illustrated mixing unit 16 is manufactured frorn a metai alloy, e.g. stainfess steel.
• the movable controliing member is also preferably manufactured from a metai alloy, such as stainless steel.
• a metai alloy such as stainless steel.
• Figs. 4a-4c show a semi-transparent illustration of a mixing unit 16, wherein the movable controliing member 4 is shown in three different positions.
• the movabie controliing member 46 comprises three bores 48, 50, 52.
• the movabie controlling member is cylindrical in shape and can be rotated relative to its cylinder axis by the handle 36, which is attached to the shaft 54.
• Fig. 4a illustrates the movabie controlling member 46 in the first position, said first position only allowing passage of pressurized water from the outlet 8 of the water pump 4 to the outiet 18 of the mixing unit 16 via the bore 48, which allows water to flow from the inlet 44 of the mixing unit 16 to the outlet 8 of the mixing unit 16.
• Fig, 4 illustrates the movable controlling member 46 in the second position, only allowing passage of pressurized water from the outlet 8 of the water pump 4 and a first cleaning agent from the first input line 20 to the outlet 18 of the mixing unit 16.
• Wafer provided by the water pump 4 enters the mixing unit 16 at the inlet 44 and passes via the bore 52 to the outlet 18 of the mixing unit 16.
• a first cleaning agent is sucked into the mixsng unit 16 via the in!et 20, wherein it is mixed with the water passing through the bore 52 and expelled through the outlet 18 of the mixing unit 16.
• Fig, 4c shows the movable controlling member 46 in the third position, only allowing passage of pressurized water from the outlet 8 of the wafer pump 4 and a second cleaning agent from the second input Sine 22, and pressurized air from the air outlet 14 of the compressor 10 - via the air inlet 15 - to the outlet 18 of the mixing unit 16 for the provision of foam.
• the bore 50 enables a fluid connection between the inlet 44 and the outlet 18 of the mixing unit 16, This means that wate flowing through this bore will suck a second cleaning agent into the mixing unit 16 via the second inlet 22, where it is mixed with said water and expelled through the output 18 of the mixing unit 16.
• the cam device 38 which is operative! connected to the movable controlling member 46, is placed such that its cam 40 engages the electrical switch 42.
• the compressor 10 is activated, and the compressor air outlet 14 is in fluid connection with the mixing unit 16 via the air input 5.
• This air supplied by the compressor 10 is then mixed with the water and the second cleaning agent at the outlet 18 of the mixing unit 16, whereby foam is produced.
• a single cleaning device 2 which can supply water, or water mixed with a first cleaning agent, or foam.
• a single cleaning device 2 having a mixing unit 16 that is fiuidly connected to the outlet 8 of a water pump 4 and the air outlet 14 of a compressor 10, and a movable controlling member 46, which can be placed in a first position, only allowing passage of pressurized water from the outlet 8 of the water pump 4 to the outlet 18 of the mixing unit 16, and a second position, only allowing passage of pressurized water from the outlet 8 of the water pump 4 and a first cleaning agent from the first input line 20 to the outlet 18 of the mixing unit 16, and a third position only allowing passage of pressurized water from the outlet 8 of the water pump 4 and a second cleaning agent from the second input line 22, and pressurized air from the air outlet 14 of the compressor 10, to the outlet 18 of the mixing unit 16 for the provision of foam, it is possible to successively change between all of the abovementioned cleaning processes simply by changing the position of the movable controlling member 46.
• the first cleaning agent is a disinfectant and the second cleaning agent is a foaming agent when being mixed with water from the water pump 4 and air from the compressor 10.
• the controlling member 46 successivel between the following positions: first, third, first, second, first, in order to perform the above-mentioned Cleaning procedure.
• Fig. 8 is shown a partial illustration -of the mixing unit 16.
• the mixing unit 16 comprises a first and a second injector 58, 58
• the first injector 58 is fluidly connected to the outlet 8 of the water pump 4, the first input line 20 for the first cleaning agent, via the bore 80 in the injector 56, and the outlet 18 of the mixing unit 16 when the controlling member 48 is in its second position, Such that - during use— an under pressure is created In said first injector 56, which draws the first cleaning agent (preferably a disinfectant) into said first injector 58 where it is mixed with water and then expelled through the outlet 18 of the mixing unit 16.
• first cleaning agent preferably a disinfectant
• the second injector 58 is fluidly connected to the outlet 8 of the water pump 4, the second input line 22 for the second cieaning agent, via the bore 62 in the second injector 58, and the outlet 18 of the mixing unit 16 when the controlling member 46 is in its third position, such tha - during use - an under pressure is created in said second injector 58, which draws the second cleaning agent into said second injector 58, where it is mixed with water and then expelled through the outlet 18 of the mixing unit 16.
• the pressure of the water supplied from the water pump 4 is able to suck up the first or second cieaning agent from respective containers, wherein they are stored. Th s implies- that no pumps are necessary for pumping up the first and second cleaning agents, the injector principle being sufficient.
• the tiiustrated injectors 56, 58 have a stepwise increasing diameter in the direction of flow. However, this increment in the diameter could also be stepless.
• the mixing unit 16 further comprises a connector 64, wherein said connector 64 is fluidly connected to the outlet 8 of the water pump 4 and the outlet 18 of the mixing unit 16 when the controlling member 46 is in the first position.
• the connector is preferably embodied as a pipe, but could also be embodied as an injector.
• the illustrated connector 64 is also fluidly connected to the air outlet 14 of the compressor 0, via the air inlet 15 in the mixing unit 16 and the bore 68 in said connector 64, and the outlet 18 of the mixing unit 16 when the controlling member 46 is. in the third position.
• Said connector 64 is preferabiy embodied as a pipe or bore in the mixing unit 18, having a relatively large cross sectional area as compared to the maximal - and average - cross sectional area of the individual injectors 56, 58.
• the connector 84 is placed between said first and second injectors 56, 58 in the mixing unit 16, Hereby is achieved that an ' initial mixing of the two cleaning agents is precluded or diminished when switching between the second and third positions of the movable controlling ' member 46.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Cleaning By Liquid Or Steam (AREA)

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• 2012
  • 2012-12-10 EP EP12816520.6A patent/EP2928620A1/de not_active Withdrawn
  • 2012-12-10 WO PCT/IB2012/057148 patent/WO2014091275A1/en active Application Filing

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