EP3645885A1 - Appareil de nettoyage à haute pression - Google Patents

Appareil de nettoyage à haute pression

Info

Publication number
EP3645885A1
EP3645885A1 EP17734301.9A EP17734301A EP3645885A1 EP 3645885 A1 EP3645885 A1 EP 3645885A1 EP 17734301 A EP17734301 A EP 17734301A EP 3645885 A1 EP3645885 A1 EP 3645885A1
Authority
EP
European Patent Office
Prior art keywords
pressure
valve
overflow
chamber
line
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
EP17734301.9A
Other languages
German (de)
English (en)
Other versions
EP3645885B1 (fr
Inventor
Andreas HÄGELE
Johannes Götz
Werner Schwab
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.)
Alfred Kaercher SE and Co KG
Original Assignee
Alfred Kaercher SE and Co KG
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 Alfred Kaercher SE and Co KG filed Critical Alfred Kaercher SE and Co KG
Publication of EP3645885A1 publication Critical patent/EP3645885A1/fr
Application granted granted Critical
Publication of EP3645885B1 publication Critical patent/EP3645885B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/24—Bypassing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • 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 invention relates to a high-pressure cleaning device with a pump for conveying a cleaning liquid, wherein the pump has a suction line and a pressure line and in the pressure line, a check valve is arranged, and wherein the pump has an overflow valve, which in response to the pressure prevailing in the pressure line Cleaning fluid a flow path via an overflow line releases the drainage of cleaning fluid from the pressure line, the overflow valve having a liquid-tight manner in a closed position on a valve seat closing body, which is movable against the closing force of a closing spring in an open position spaced from the valve seat and the valve via a valve connected to a slidably held in a control chamber and pressurized with cleaning fluid control piston is connected.
  • a cleaning liquid preferably water
  • the high-pressure cleaning device has a pump, which can be driven by a motor, preferably by an electric motor, and has at least one reciprocable piston which dips into a pumping chamber.
  • the pump comprises three reciprocable pistons, each immersed in a pumping chamber.
  • Pressurized cleaning liquid may be supplied to the pump via a liquid supply line, for example, via a suction hose, and the pressurized cleaning liquid may be supplied from the pump via a liquid discharge line, for example, via a high pressure hose, a liquid discharge member such as a spray gun or a spray lance ,
  • the liquid delivery member has a valve that can be opened and closed by the user. When the valve is open, the pressurized cleaning fluid can be discharged, and by closing the valve, the liquid discharge can be stopped.
  • the high-pressure cleaning device has an overflow valve which opens in dependence on the pressure prevailing in the pressure line and releases a flow path, so that cleaning fluid can flow out of the pressure line via an overflow line in order to lower the pressure in the pressure line.
  • an overflow valve which opens in dependence on the pressure prevailing in the pressure line and releases a flow path, so that cleaning fluid can flow out of the pressure line via an overflow line in order to lower the pressure in the pressure line.
  • the flow path extends from the pressure line via the overflow line to the suction line, so that when a predetermined maximum value of the pressure prevailing in the pressure line is exceeded, the overflow valve opens and cleaning fluid can flow from the pressure line via the overflow line to the suction line.
  • the pump can thereby be operated in the circuit.
  • the flow path extends from the pressure line via the overflow line to an outlet, via which cleaning liquid can be dispensed when a predetermined maximum value of the pressure prevailing in the pressure line is exceeded.
  • the flow path extends from the pressure line to a collecting space, which receives cleaning liquid from the pressure line when the pressure prevailing in the pressure line is exceeded.
  • the overflow valve has a closing body which rests liquid-tight in a closed position on a valve seat and can be moved against the closing force of a closing spring in an open position in which it occupies a distance from the valve seat and thereby releases the flow path from the pressure line via the overflow.
  • the control of the closing body by means of a control piston which is rigidly connected via a valve rod to the closing body and which can be acted upon with pressurized cleaning liquid.
  • a high-pressure cleaning device of the aforementioned type is known from WO 2016/015763 AI.
  • the pressure prevailing in the delivery of cleaning fluid in the pressure line acts on one side of the control piston and on the opposite side of the control piston is acted upon by the closing force of the closing spring.
  • the closing force of the closing spring thus counteracts the pressure force resulting from the application of the control piston to the pressure of the cleaning fluid prevailing in the pressure line.
  • the pressure of the cleaning liquid can be more than 100 bar, in particular at least 150 bar.
  • a high-pressure cleaning device in which an overflow valve in dependence on the pressure prevailing in the pressure line flow rate of the cleaning liquid can be actuated.
  • a throttle element in the form of an injector is arranged in a downstream of the check valve arranged region of the pressure line, which has a first narrowing in the flow direction and then widening again through hole, branches off from the narrowest point of a transverse bore.
  • the prevailing in the transverse bore pressure of the cleaning fluid is dependent on the flow rate and is used to control the spill valve.
  • the closing spring of the spill valve can be made weaker and smaller in size, however, the use of the injector not insignificant flow losses result, since the injector is a not insignificant flow resistance. This in turn leads to a higher energy consumption of the high-pressure cleaner.
  • Object of the present invention is therefore to develop a high-pressure cleaner of the type mentioned in such a way that the size of the spill valve reduced without the use of an injector and the assembly of the high-pressure cleaner can be simplified.
  • control piston divides the control chamber into an outlet pressure chamber and an overflow chamber, wherein the outlet pressure chamber is connected via a pressure channel to a region of the pressure line arranged downstream of the non-return valve and has a first passage opening which is passed liquid-tightly by a piston rod fixed to the control piston, and wherein the overflow chamber is connected via a line section of the overflow to a arranged upstream of the check valve portion of the pressure line and having a second passage opening forming the valve seat, wherein the two passage openings are different sizes and the control piston can be acted upon on its side facing the larger passage opening with the closing force of the closing spring.
  • control chamber is subdivided by the control piston into an outlet pressure chamber and an overflow chamber.
  • the control piston is preferably surrounded in the circumferential direction by a sealing element, for example a sealing ring, which seals the outlet pressure chamber with respect to the overflow chamber.
  • the outlet pressure chamber can be acted upon by the pressure prevailing in the pressure line downstream of the check valve. It is for this purpose connected via a pressure channel with a downstream of the check valve arranged region of the pressure line.
  • the overflow chamber forms a region of the overflow line. It is connected via a line section of the overflow line to a region of the pressure line arranged upstream of the check valve. The overflow chamber can therefore be acted upon by the pressure prevailing upstream of the check valve in the pressure line.
  • the pressure prevailing downstream of the check valve in the pressure line is identical to the pressure prevailing in the pressure line upstream of the check valve, with the exception of slight pressure losses which the cleaning fluid undergoes as it flows through the check valve.
  • the discharge of cleaning liquid therefore prevail in the Auslasstikhunt and the overflow substantially the same pressures, wherein a first piston side of the control piston is acted upon by the pressure prevailing in the Auslasstikhunt pressure and wherein a second piston side of the control piston, which faces away from the first piston side, with the in the overflow prevailing pressure is applied.
  • the outlet pressure chamber has a first passage opening, which is liquid-tight by a piston rod fixed to the control piston is penetrated.
  • the piston rod extends from the control piston through the outlet pressure chamber to the first passage opening.
  • the surface of the control piston is reduced in the outlet pressure, which is pressurized in the direction of the overflow chamber with pressure.
  • the larger the first passage opening the lower the pressureable area, since this is reduced by the piston rod passing through the first passage opening. This in turn has the consequence that in the outlet pressure chamber acting on the control piston, directed in the direction of the overflow pressure chamber is reduced.
  • the overflow chamber likewise has a passage opening, which in the present case is referred to as a second passage opening.
  • the second passage opening forms the valve seat of the overflow valve.
  • the closing body of the overflow valve bears against the valve seat.
  • the closing body is connected via the valve rod with the control piston.
  • the valve rod extends from the control piston through the overpressure chamber until it reaches the valve body of the second passage opening.
  • One of the two passage openings for example the second passage opening, is larger according to the invention than the other passage opening, for example the first passage opening.
  • the side of the control piston, which faces the larger passage opening, is subjected to a smaller pressure load than the side which faces the smaller passage opening.
  • the resulting pressure load which acts on the control piston and causes it to shift, resulting from the difference of the pressure loads acting in the outlet pressure chamber and the overflow chamber on the control piston. From the different sizes of the two Through openings results in a resulting pressure load, which causes the control piston to shift in the direction of the larger passage opening. This resulting pressure load counteracts the closing force of the closing spring, which acts on the control piston on the side facing the larger passage opening.
  • the closing force which is required to reliably hold the closing body in its closed position during the dispensing of cleaning liquid can thus be kept low.
  • Decisive for the strength of the required closing force is only the difference of the pressure forces acting on the control piston in the outlet pressure chamber and the overflow chamber. For this difference, in turn, the size difference between the two ports is important. The smaller the difference in size, the lower the required closing force.
  • the pressure forces are dependent on the pressure prevailing in the pressure line of the cleaning liquid. The greater the pressure, the greater the pressure forces acting on the control piston. In contrast to the pressure forces exerted by the closing spring on the control piston closing force is independent of the pressure of the cleaning fluid. If the pressure in the pressure line exceeds a predetermined maximum value, then the closing force exerted by the closing spring on the control piston is no longer sufficient to hold the control piston, but the control piston then moves under the effect of the pressure load and via the valve rod with the control piston connected closing body lifts off the valve seat and releases the flow path from the pressure line via the overflow, so that cleaning liquid flow out of the pressure line and thereby the pressure in the pressure line can be lowered.
  • the closing spring In order to hold the closing body in its closed position, the closing spring has to apply only a closing force to the control piston, which is rigidly connected to the closing body via the valve rod, which corresponds to the difference of the pressure forces acting on the control piston.
  • This allows the use of a closing spring with a relatively small size, without requiring an injector must be arranged in the pressure line. In the absence of an injector, the flow losses of the cleaning fluid under pressure can be kept low in the high-pressure cleaning device according to the invention.
  • the closing spring is preferably arranged in the overflow chamber.
  • the closing spring between the control piston and a valve seat member is clamped, wherein the valve seat member forms the second passage opening and the valve seat
  • the control piston On its side facing the second passage opening, in a preferred embodiment of the invention, the control piston carries the valve rod, wherein the valve rod passes through the overflow chamber and the second passage opening and carries the closing body at its region protruding from the overflow chamber, and the valve seat faces away from the overflow chamber Side of the valve seat member is arranged and the closing body against the closing force of the closing spring with the pressure prevailing in the overflow pressure of the cleaning liquid can be acted upon.
  • the closing body is arranged on the side of the valve seat element facing away from the overflow chamber and is acted upon in the closed position via the second passage opening with the pressure prevailing in the overflow chamber. This pressurization is opposite to the closing force of the closing spring. Via the valve rod, the pressure acting on the closing body acts on the control piston, so that it is not only subject to the pressure forces acting directly on it, but also the pressure force acting on the closing body.
  • the closing spring is designed as a helical spring which surrounds the valve rod.
  • the piston rod and the valve rod are cylindrical and have different diameters. In particular, it can be provided that the diameter of the piston rod is greater than the diameter of the valve rod.
  • a sliding sleeve is arranged, in which the control piston is slidably mounted.
  • the control piston carries a sealing ring which rests liquid-tight on the sliding sleeve.
  • the surrounding the control piston in the circumferential direction of the sealing ring slides along with a displacement of the control piston on the sliding sleeve and the frictional forces between the sealing ring and the sliding sleeve can be kept low by suitable choice of material. When worn, the sliding sleeve can be easily replaced.
  • the sliding sleeve is preferably at least partially, in particular completely, made of a plastic material or of metal.
  • control piston has a first piston part and a second piston part which is rigidly connected to the first piston part.
  • the two piston parts are conveniently releasably connectable to each other.
  • the two piston parts are screwed together.
  • the piston rod is conveniently located on the first piston part.
  • the first piston part is integrally connected to the piston rod.
  • the first piston part and the piston rod preferably form a one-piece component made of metal or of a plastic material.
  • the valve rod is conveniently located on the second piston part. It can be provided that the second piston part is integrally connected to the valve rod.
  • the second piston part is detachably or permanently connected to the valve stem.
  • the second piston part can be screwed to the valve rod.
  • a pressure relief valve is integrated in the control piston which releases a flow path between the outlet pressure chamber and the overflow chamber as a function of the pressure difference between the pressure of the cleaning fluid prevailing in the outlet pressure chamber and in the overflow chamber. If the pressure difference reaches a predetermined limit value, pressure equalization can take place via the pressure relief valve by opening the pressure relief valve. If the pressure difference is smaller than the predetermined limit, the pressure relief valve is closed.
  • the outlet pressure chamber is connected via a pressure channel with a region of the pressure line arranged downstream of the non-return valve.
  • the overflow chamber is connected via a first line section of the overflow line to a region of the pressure line arranged upstream of the check valve.
  • a second line section of the overflow line adjoins the valve seat of the overflow valve and the flow connection between the overflow chamber and the second line section of the overflow line can be opened and interrupted with the aid of the overflow valve as a function of the pressure of the cleaning fluid.
  • Pressurized cleaning fluid can be supplied via the pressure line and a liquid discharge line connected to the pressure connection of the high-pressure cleaning device to a liquid delivery device, for example a spray gun or a spray lance.
  • the pressurized cleaning liquid flows through the pressure line, wherein the check valve is opened and the overflow valve is closed. If the liquid discharge member is closed, the pressure of the cleaning liquid increases due to the activity of the pump in the pressure line. If the pressure of the cleaning liquid exceeds a predetermined maximum value, the overflow valve opens and cleaning liquid can flow out of the pressure line via the overflow line, for example to the suction line.
  • the check valve in this case goes into its closed position and thus interrupts the flow connection between the upstream of the check valve arranged region of the pressure line and the downstream of the check valve arranged region of the pressure line.
  • the pressure relief valve is preferably integrated in the control piston, which passes into its open position due to the high pressure downstream of the check valve in the pressure line, and thus a flow connection between the outlet pressure chamber and the overflow chamber releases.
  • the pressure prevailing downstream of the check valve pressure of the cleaning liquid can be lowered by cleaning fluid from the region of the pressure line downstream of the check valve via the pressure channel, the outlet pressure chamber and the opened pressure relief valve to the overflow chamber and from this via the second line section of the overflow, for example, can flow to the suction line.
  • the pressure in the liquid discharge line for example, a high-pressure hose is lowered. This makes it easier for the user to subsequently reopen the fluid delivery device.
  • the integrated in the control piston pressure relief valve preferably has a valve body which can be acted upon by a valve spring with a closing force, under the action of the valve body rests against a valve seat.
  • the pump has a valve chamber into which an overflow device having the overflow valve can be inserted in the form of a preassembled subassembly.
  • the preassembled module preferably has the valve seat element and the closing body of the overflow valve, the control piston and the piston rod, the valve rod and also the closing spring, which is supported on the one hand on the control piston and on the other hand on the valve seat element.
  • a pressure relief valve can be integrated in the control piston.
  • FIG. 1 shows a schematic side view of a high-pressure cleaning device
  • FIG. 2 shows a partial sectional view of a pump of the high-pressure cleaning device from FIG. 1;
  • FIG. 3 shows an enlarged view of an overflow device of the pump from FIG. 2, wherein the overflow device forms a preassemblable subassembly and has an overflow valve.
  • the high-pressure cleaning device 10 has a motor 12, which drives a pump 14 and is designed in the illustrated embodiment as an electric motor.
  • the pump 14 has a cylinder head 16, which forms a plurality of pump chambers, wherein in the drawing, for better clarity, only one of a total of three pump chambers is provided.
  • a piston 20 is immersed, which is driven by the motor 12 to a reciprocating motion.
  • the pumping chamber 18 Via an inlet valve 22 and a suction line 24, the pumping chamber 18 is connected to a suction port 26, and via an outlet valve 28 and a pressure line 30, the pumping chamber 18 is connected to a pressure port 32.
  • liquid supply line such as a suction hose
  • the pump 12 under pressure to be set cleaning fluid preferably water
  • the pressure port 32 can be connected in the usual manner and therefore not shown to achieve a better overview in the drawing liquid discharge line, such as a high-pressure hose, which carries at its free end a closable liquid delivery member, such as a spray gun or a spray lance.
  • a closable liquid delivery member such as a spray gun or a spray lance.
  • cleaning liquid which has been pressurized by the pump 14, can be supplied to the liquid delivery element.
  • a check valve 34 is arranged, which is preferably designed without a spring and has a check valve body 36.
  • the check valve body 36 is liquid-tight with the interposition of a sealing ring 38 to a check valve seat 40 can be applied and can assume an open position not shown in the drawing, in which it is arranged at a distance from the check valve seat 40 for dispensing pressurized cleaning fluid.
  • the cylinder head 16 has a stepped valve chamber 42 which can be closed in a liquid-tight manner with the aid of a sealing plug 44 and into which an overflow device 46 in the form of a preassembled structural unit is inserted.
  • the valve chamber 42 has a first, inwardly directed step 48 at a distance from the closure plug 44, and at a distance from the first step 48, the valve chamber 42 has a second, inwardly directed step 50.
  • the valve chamber 42 is configured cylindrical and receives in the area between the sealing plug 44 and the first stage 48 a sliding sleeve 52 which abuts the wall of the valve chamber 42 with the interposition of a sealing ring 54.
  • the sliding sleeve 52 is made of a plastic material. It could also be made of a metal.
  • the sliding sleeve 52 surrounds in the region between the stopper 44 and the first stage 48, a control chamber 56 which extends to the second stage 50 and in which a control piston 58 is held parallel to a longitudinal axis 60 of the valve chamber 42 slidably.
  • the control piston 58 has an annular groove extending over the outer circumference of the control piston 58 in which a second sealing ring 62 is arranged, which rests in a fluid-tight manner on the sliding sleeve 52.
  • the control piston 58 divides the control chamber 56 into an outlet pressure chamber 64 and an overflow chamber 66.
  • the outlet pressure chamber 64 is arranged between the control piston 58 and the closure plug 44 and connected via a pressure channel 68 to a region of the pressure line 30 arranged downstream of the check valve 34.
  • the overflow chamber 66 is arranged between the control piston 58 and a valve seat element 70 arranged on the second stage 50 and is connected via a first line section 72 of an overflow line 74 to a region of the pressure line 30 arranged upstream of the check valve 34.
  • a second line section 76 of the overflow line 74 connects to the second stage 50 of the valve chamber 42 and opens into the suction line 24th
  • the valve seat member 70 is surrounded by a third sealing ring 78 which bears against the wall of the valve chamber 42 liquid-tight.
  • the control piston 58 On its side facing the outlet pressure chamber 64, the control piston 58 carries a piston rod 94, which is aligned coaxially with the longitudinal axis 60 of the valve chamber 42.
  • the sealing plug 44 has a first passage opening 96 which is aligned coaxially to the longitudinal axis 60.
  • the piston rod 94 passes through the outlet pressure chamber 64 and the first passage opening 96, wherein it is surrounded by a fourth sealing ring 98. With a free end 100 facing away from the control piston 58, the piston rod 94 protrudes from the outlet pressure chamber 64.
  • the valve seat element 70 has a second passage opening 80 which is aligned coaxially to the longitudinal axis 60 of the valve chamber 42 and forms a valve seat 82 of an overflow valve 84 on its end facing the second line section 76 of the overflow line 74.
  • a closing body 86 of the overflow valve 84 which widens conically in the direction of the second line section 76, bears against the valve seat 82 in a liquid-tight manner in a closed position shown in FIGS. 2 and 3. Via a valve rod 88, the closing body 86 is rigidly connected to the control piston 58.
  • valve rod 88 is aligned coaxially with the longitudinal axis 60, passes through the overflow chamber 66 and the second passage opening 80 and protrudes with its control piston 58 facing away from the free end 90 in the second line section 76 of the overflow 74.
  • the valve rod 88 is surrounded by a closing spring 92 designed as a helical spring, which is clamped between the control piston 58 and the valve seat element 70 and acts on the control piston 58 with a closing force.
  • the piston rod 94 is cylindrical as well as the valve rod 88, wherein the diameter of the piston rod 94 is greater than the diameter of the valve rod 88.
  • the first passage opening 96 is as well as the second passage opening 80 designed cylindrical. The diameter of the first passage opening 96 is only slightly larger than the diameter of the piston rod, whereas the diameter of the second passage opening 80 is significantly larger than the diameter of the valve rod 88.
  • the valve rod 88 is surrounded by an annular space 89, about an annular surface 91 of the closing body 86 can be acted upon by the pressure of the cleaning liquid prevailing in the overflow chamber 66.
  • the diameter of the first passage opening 96 is smaller than the diameter of the second passage opening 80 and thus smaller than the diameter of the valve seat 82.
  • the diameter of the first passage opening 96 may be 4.0 mm, for example, and the diameter of the second passage opening 80 and the valve seat 82 can be 4.3 mm, for example.
  • the control piston 58 has a first piston part 102 and a second piston part 104.
  • the first piston part 102 is integrally connected to the piston rod 94 and forms together with the piston rod 94 is a one-piece component made of metal or of a plastic material.
  • the second piston part 104 forms an annular piston portion 106 which carries on its outer side the second sealing ring 62 and to which a piston skirt 108 integrally connects.
  • the piston shaft 108 is rigidly connected to the valve rod 88 via a screw connection 110.
  • the first piston part 102 has a piston sleeve 112, which dips into the annular piston portion 106 of the second piston part 104 and is detachably connected via a screw connection with the second piston part 104 with the interposition of a fifth sealing ring 114.
  • a pressure relief valve 116 is integrated, which has a spherical valve body 118 which is pressed by a valve spring 120 against a valve seat 122.
  • the first piston part 102 has a first radial bore 124, to which a piston sleeve 112 axially cross-stepped, stepped configured axial bore 126 connects, which forms the valve seat 122.
  • the outlet pressure chamber 64 is in fluid communication with the overflow chamber 66, wherein the flow connection by means of the spring-loaded valve body 118 in dependence on the pressure difference between in the outlet pressure chamber 64 and in the overflow chamber 66 prevailing pressure of the cleaning liquid is releasable and interruptible.
  • the outlet pressure chamber 64 and thus also the outlet pressure chamber 64 facing first piston side 132 of the control piston 58 can be acted upon via the pressure channel 68 with the prevailing in the pressure line 30 downstream of the check valve 34 pressure of the cleaning liquid.
  • the overflow chamber 66 and thus also the second piston side 134 of the control piston 58 facing the overflow chamber 66 can be acted upon via the first line section 72 of the overflow line 74 with the pressure of the cleaning fluid prevailing upstream of the check valve 34.
  • the pressure of the cleaning liquid acting on the first piston side 132 exerts on the control piston 58 a first pressure force directed parallel to the longitudinal axis 60 and counteracting the closing force of the closing spring 92
  • the pressure of the cleaning fluid acting on the second piston side 134 exerts on the control piston 58 a oriented parallel to the longitudinal axis 60 and the first pressure force opposing second pressure force.
  • the control piston 58 is acted upon in the closed position of the closing body 86 with a compressive force resulting from the action of the pressure, which acts in the closed position of the closing body 86 on the annular surface 91 and is transmitted via the valve rod 88 to the control piston 58.
  • the check valve 34 When the high-pressure cleaning device 10 releases pressurized cleaning fluid, the check valve 34 is opened, and the upstream Downstream of the check valve 34 in the pressure line 30 prevailing pressure of the cleaning liquid is the same as the downstream of the check valve 34 in the pressure line 30 prevailing pressure of the cleaning liquid except for low pressure losses, which suffers the cleaning fluid during the pressure flow of the springless check valve 34.
  • the outlet pressure chamber 64 virtually the same pressure that prevails in the overflow 66 and the pressure acting on the control piston 58 pressure forces resulting from the sizes of the first piston side 132 and the second piston side 134 and the annular surface 91 of the closing body 86, with the in the overflow chamber 66 prevailing pressure is applied.
  • the diameter of the valve seat 82 of the overflow valve 84 is greater than the diameter of the first passage opening 96, whereas the two piston sides 132, 134 are equal. This has the consequence that the control piston 58 is acted upon by a resulting differential pressure force, which is opposite to the closing force of the closing spring 92.
  • the closing spring 92 counteracts the acting pressure differential force so that the closing body 86 reliably assumes its closed position during the delivery of pressurized cleaning liquid and consequently the flow connection from the pressure line 30 via the overflow line 74 to the suction line 24 is interrupted.
  • the required closing force of the closing spring 92 is relatively low, so that the closing spring 92 may have a small size.
  • an increasing pressure if the pump 14 is not turned off.
  • the increasing pressure of the cleaning liquid acts via the pressure channel 68 and the outlet pressure chamber 64 on the first piston side 132 and via the first line section 72 of the overflow 74 and the overflow 66 on the second piston side 134 and the prevailing in the overflow chamber 66 pressure of the cleaning liquid acted upon annular surface 91 of the closing body 86.
  • the increasing pressure of the cleaning liquid has an increasing differential pressure force result which counteracts the closing force of the closing spring 92.
  • the control piston 58 is displaced counter to the closing force of the closing spring 92 in the direction of the valve seat element 70, so that the closing body 86 lifts off from the valve seat 82 and assumes an open position.
  • a flow connection to the suction line 24 is released via the overflow line 74 and the opened overflow valve 84.
  • the prevailing in the pressure line upstream of the check valve 34 pressure of the cleaning liquid is significantly lowered. Due to the pressure drop in the region upstream of the check valve 34 closes the check valve 34, so that in the outlet pressure chamber 64, a higher pressure acts as in the overflow chamber 66.
  • the pressure can be reduced. This in particular makes it possible to reduce the pressure in the liquid discharge line connected to the pressure connection 32.
  • the cleaning liquid is subject to only small pressure losses when flowing through the pressure line 30. This reduces the power consumption of the high-pressure cleaner 10 in the discharge of cleaning liquid.
  • the closing spring 92 may have a small size. This makes it possible to keep the overall size of the entire overflow device 46 low, wherein the overflow device 46 can be inserted into the valve chamber 42 in the form of a preassembled structural unit. This also simplifies the assembly of the high-pressure cleaning device 10.

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

Abstract

L'invention concerne un appareil de nettoyage à haute pression (10) comprenant une pompe (14) qui possède une conduite d'aspiration (24) et une conduite de refoulement (30), un clapet anti-retour (34) étant disposé dans la conduite de refoulement (30), et qui possède une soupape de décharge (84) qui libère, en fonction de la pression, un trajet d'écoulement par le biais d'une conduite de décharge (74) pour l'évacuation de liquide de nettoyage hors de la conduite de refoulement (30). La soupape de décharge (84) possède un corps de fermeture (86) qui, en position fermée, repose de manière étanche aux liquides contre un siège de soupape (82), et qui peut être déplacé dans une position ouverte, espacée du siège de soupape (82), en s'opposant à la force de fermeture d'un ressort de fermeture (92), et comprend un piston de commande (58) maintenu de manière coulissante dans une chambre de commande (56) et pouvant être sollicité par du liquide de nettoyage sous pression. En vue de réduire la taille de la soupape de décharge (84) sans utiliser un injecteur, le piston de commande (58) subdivise la chambre de commande (56) en une chambre de pression de sortie (64) et une chambre de décharge (66). La chambre de pression de sortie (64) est reliée à une zone de la conduite de refoulement (30) disposée en aval du clapet anti-retour (34) et possède une première ouverture de passage (96) qui est traversée par une tige de piston (94) fixée au piston de commande (58). La chambre de décharge (66) est reliée à une zone de la conduite de refoulement (30) disposée en amont du clapet anti-retour (34) et possède une deuxième ouverture de passage (80) qui forme le siège de soupape (82). Les ouvertures de passage (96, 80) sont de tailles différentes et le piston de commande (58) peut être sollicité par la force de fermeture du ressort de fermeture (92) par son côté qui fait face à l'ouverture de passage la plus grande.
EP17734301.9A 2017-06-29 2017-06-29 Appareil de nettoyage à haute pression Active EP3645885B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2017/066187 WO2019001719A1 (fr) 2017-06-29 2017-06-29 Appareil de nettoyage à haute pression

Publications (2)

Publication Number Publication Date
EP3645885A1 true EP3645885A1 (fr) 2020-05-06
EP3645885B1 EP3645885B1 (fr) 2021-06-02

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EP17734301.9A Active EP3645885B1 (fr) 2017-06-29 2017-06-29 Appareil de nettoyage à haute pression

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EP (1) EP3645885B1 (fr)
CN (1) CN110832200B (fr)
WO (1) WO2019001719A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020131796A1 (de) 2020-12-01 2022-06-02 Alfred Kärcher SE & Co. KG Kolbenpumpe für ein hochdruckreinigungsgerät
CN112747581B (zh) * 2020-12-31 2023-03-28 北京中矿博能节能科技有限公司 多级多效网链闭式煤泥干燥系统
CN113107799B (zh) * 2021-05-20 2022-12-16 浙江亿力机电股份有限公司 适用于高压清洁设备的活塞泵

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29716274U1 (de) * 1997-09-10 1999-01-14 Lorentz, Bernt, 22457 Hamburg Überströmventil
DE19838947C1 (de) * 1998-08-12 1999-11-25 Frank Arbeiter Bypassventilanordnung für ein Hochdruckreinigungsgerät sowie Hochdruckreinigungsgerät mit einer solchen Bypassventilanordnung
CN1302205C (zh) * 2004-05-12 2007-02-28 胡松海 差压式低保压关枪停机装置
CN2861665Y (zh) * 2005-12-22 2007-01-24 上海神龙清洗机有限公司 一种用于高压清洗机的溢流阀
DE102009049095A1 (de) * 2009-10-01 2011-04-07 Alfred Kärcher Gmbh & Co. Kg Pumpe für ein Hochdruckreinigungsgerät
DE102009049096A1 (de) 2009-10-01 2011-04-07 Alfred Kärcher Gmbh & Co. Kg Pumpe für ein Hochdruckreinigungsgerät
EP2805055B1 (fr) * 2012-01-20 2016-05-25 Alfred Kärcher GmbH & Co. KG Pompe à piston pour un appareil de nettoyage sous haute pression
WO2016015763A1 (fr) 2014-07-30 2016-02-04 Alfred Kärcher Gmbh & Co. Kg Pompe à piston et appareil de nettoyage à haute pression équipé d'une telle pompe à piston
CN205154198U (zh) * 2015-11-26 2016-04-13 山东瀚业机械有限公司 一种内注式单体液压支柱专用自动泄压阀

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Publication number Publication date
CN110832200A (zh) 2020-02-21
EP3645885B1 (fr) 2021-06-02
WO2019001719A1 (fr) 2019-01-03
CN110832200B (zh) 2021-08-10

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