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
• • 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
  • 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
  • F04B49/246—Bypassing by keeping open the outlet valve
• • 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
• • 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
  • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
• • 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
  • B08B2203/0205—Bypass pressure relief valves
• • 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
  • B08B2203/027—Pump details

Definitions

• the invention relates to a high-pressure cleaning device with a pump for conveying a cleaning liquid, wherein the pump has at least one pumping chamber into which a reciprocable piston is immersed and the via an inlet valve and a suction line with a suction port and an outlet valve and a pressure line with a Pressure port is connected, wherein in the pressure line, a check valve is arranged, and wherein the pump has a spill valve, which is arranged in a pressure line upstream of the check valve to the suction line connecting overflow and an overflow valve body whose position relative to an associated spill valve seat by means of a Actuator in dependence on the pressure prevailing in the pressure line of the cleaning liquid is controllable.
• a cleaning liquid preferably water
• the high-pressure cleaning device has a pump, which can be driven by a motor, for example by an electric motor or an internal combustion engine, and has at least one reciprocable piston which dips into 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 closable liquid dispenser, in particular a spray gun or a spray lance, be supplied.
• the flow resistance of the liquid delivery member can be changed by the user.
• the liquid delivery member may for example have a rotary knob.
• the user can completely close the liquid delivery organ.
• the flow resistance of the liquid discharge member the user can change the amount of liquid discharged per unit time. If the flow resistance is increased, then the amount of liquid dispensed per unit time decreases, the flow resistance is reduced, so increases the amount of liquid discharged per unit time. Due to the ongoing pump, a change in the flow resistance of the liquid delivery member also results in a change in the pressure prevailing in the pressure line of the cleaning liquid result. The lower the flow resistance, the lower the pressure prevailing in the pressure line.
• the overflow valve has an overflow valve body, which in a closed position rests in a fluid-tight manner on an overflow valve seat and whose position can be controlled relative to the associated overflow valve seat by means of an actuator as a function of the pressure of the cleaning fluid prevailing in the pressure line.
• a high-pressure cleaning device of the type mentioned is from the
• Object of the present invention is therefore to develop a high-pressure cleaning device of the type mentioned in such a way that the opening of a liquid discharge member is facilitated.
• the high-pressure cleaner has a pressure relief valve, via which a flow path from the region of the pressure line downstream of the check valve to the suction line is released when a predetermined limit pressure is exceeded.
• the delivery of cleaning liquid is terminated by a user completely closing the liquid delivery member, the associated pressure increase in the pressure line results in the overflow valve completely completing the flow connection between the region of the pressure line and the suction line arranged upstream of the check valve on the other hand, a flow path from the region of the pressure line downstream of the check valve to the suction line is released via the pressure relief valve.
• the flow path from the downstream of the check valve disposed portion of the pressure line to the suction line is released from the pressure relief valve when the pressure prevailing in the pressure line downstream of the check valve pressure exceeds a predetermined limit pressure. This overrun is due to the continued operation of the pump when the user completely closes the fluid delivery device.
• the limiting pressure may be, for example, at least 150 bar, in particular about 180 bar.
• the flow path which is releasable from the pressure relief valve, has a control line via which the actuator of the overflow valve can be acted upon by the pressure prevailing in the pressure line downstream of the non-return valve.
• the high-pressure cleaning device has a control line, which serves on the one hand to act on the actuator which cooperates with the overflow valve body with the pressure prevailing in the pressure line downstream of the check valve.
• the control line forms a portion of the flow path through which the pressure of the cleaning liquid prevailing in the pressure line downstream of the check valve and in the liquid discharge line connected to the pressure connection can be lowered when the pressure of the cleaning liquid exceeds the predetermined limit pressure, as this when closing the liquid delivery member is the case.
• control line via which the actuator of the overflow valve with the downstream of the check valve in the pressure line prevailing pressure of the cleaning liquid can be acted upon, via a
• Pressure relief line and the pressure relief valve connected to the overflow line opens into the overflow, so that when exceeded the predetermined limit pressure of the pressure prevailing downstream of the check valve and in the liquid discharge line pressure can be lowered via the overflow line connected to the suction line.
• the pressure relief line opens via the pressure relief valve in a downstream of the spill valve arranged line section of the overflow.
• the downstream of the spill valve arranged line section of the overflow preferably extends to the suction line.
• the pressure relief valve can be used as a preassembled unit in a Druckentiastungsventiihunt the pump. This facilitates the installation of the high-pressure cleaner.
• the Druckentiastungsventiihunt can form, for example, a blind bore which is formed in a cylinder head of the pump.
• the Druckentiastungsventiihunt opens into an end face of the pump, which is facing away from a motor driving the pump, in particular an electric motor or internal combustion engine.
• the pressure relief valve has a valve sleeve which, in particular with the interposition of at least one sealing element, is inserted into the Druckentiastungsventiihunt and forms a support surface for a pressure relief valve spring which acts on a pressure relief valve body with a closing force in the direction of a pressure relief valve seat ,
• the pressure relief valve seat is preferably formed by a pressure relief valve seat element, which can be inserted with the interposition of a sealing element in the pressure relief valve sleeve.
• a sealing plug is used, which closes the pressure relief valve chamber liquid-tight.
• the pressure relief valve has a pressure relief valve body, which is biased by means of a pressure relief valve spring in a closed position in which it rests liquid-tight on a pressure relief valve seat.
• the pressure relief valve body can be moved against the force of the pressure relief valve spring from its closed position to an open position in which it releases the flow path from the downstream of the check valve arranged region of the pressure line to the suction line.
• the pressure relief valve body in the closed position on its side facing the pressure relief valve seat with the pressure prevailing in the pressure line downstream of the check valve pressure of the cleaning liquid and on its side facing away from the pressure relief valve seat with the pressure prevailing in the pressure line upstream of the check valve seat pressure and with Closing force of the pressure relief valve spring can be acted upon.
• the effective pressure force acting on the pressure relief valve body during the discharge of cleaning liquid is therefore low.
• the pressure relief valve spring only has to exert a relatively low closing force on the pressure relief valve body in order to reliably press it against the valve seat during the delivery of pressurized cleaning fluid.
• the pressure relief valve spring may therefore have a relatively small size and requires no adjustment during their assembly.
• the spill valve body is conically configured in a preferred embodiment of the invention and biased by means of a Studentsströmventilfeder in a closed position in which it rests liquid-tight on a spill valve seat.
• the overflow valve body can be displaced by the actuator against the force of the overflow valve spring in the direction opposite to the overflow valve seat, wherein it assumes an even greater distance to fürströmventilsitz, the greater the pressure of the cleaning liquid, with which the actuator is acted upon.
• this pressure is dependent on the flow resistance of the liquid delivery member. The greater the flow resistance, the greater the pressure of the cleaning fluid acting on the actuator, and the greater the distance that the overflow valve body assumes to the overflow valve seat.
• the conical configuration of the spill valve body makes it possible to choose the diameter of the spill valve seat relatively large.
• the large valve seat diameter allows for the shutdown of the pump driving motor late closing of the spill valve. This allows a smooth depressurization process while reducing the speed of the engine.
• the overflow valve has a swirl chamber downstream of the overflow valve seat for swirling the cleaning fluid. As a result, cavitation can be avoided in the region of the overflow valve seat.
• the overflow valve has a sleeve-shaped valve seat element which forms the overflow valve seat and into which an inner sleeve can be inserted, which forms the swirl chamber in combination with the valve seat element.
• the vortex chamber is formed in two parts in such an embodiment.
• the vortex chamber can also be designed in one piece. It can be provided, for example, that the valve seat element forms the vortex chamber.
• the actuator of the spill valve is designed as a control piston, which is displaceably mounted in a sliding sleeve against a resilient biasing force by application of pressurized cleaning fluid.
• a sliding sleeve is used, which can be easily replaced when worn.
• the control piston carries on its outer side a sealing ring, which rests liquid-tight on the sliding sleeve.
• the control piston can be counteracted by a resilient biasing force with pressurized cleaning fluid acted upon.
• the biasing force is conveniently adjustable.
• the pump has an overflow valve chamber into which an overflow device having the overflow valve can be inserted in the form of an at least partially preassembled subassembly. This facilitates the installation of the high-pressure cleaner.
• the overflow valve chamber forms a blind bore, which is formed for example in a cylinder head of the pump.
• the blind bore preferably the above-mentioned sleeve-shaped valve seat member of the spill valve and the sliding sleeve can be used, wherein the sliding sleeve is favorably aligned coaxially with the sleeve-shaped valve seat member.
• the sliding sleeve forms a sealing plug which closes the overflow valve chamber and has an opening which is penetrated by a rigidly connected to the control piston piston rod.
• the piston rod is integrally connected to the control piston and forms together with the control piston a one-piece component.
• the piston rod protrudes from the relief valve chamber.
• the piston rod is surrounded in its protruding from the fürströmventilhunt area of a helical biasing spring, which is supported on the one hand on the sliding sleeve and on the other hand on a held on the piston rod spring plate.
• 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;
• Figure 3 an enlarged view of a spill valve and a
• 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 pumping chambers, preferably three pumping chambers, wherein in the drawing to achieve a better overview, only one pumping chamber 18 is shown schematically.
• a piston 20 is immersed, which goes from the engine 12 to a back and forth Movement is driven.
• 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.
• To the suction port 26 can be connected in a conventional manner and therefore not shown in the drawing to improve clarity in the drawing, for example, a suction hose, via which the pump 14 under pressure to be set cleaning fluid, preferably water, can be supplied ,
• To the pressure port 32 can be connected in the usual manner and therefore to achieve a better overview in the drawing, not shown, liquid discharge line, for example, a high-pressure hose, at its free end a liquid delivery device with variable flow resistance, such as a spray gun or a spray lance , wearing.
• cleaning liquid which has been pressurized by the pump 14, can be supplied to the liquid delivery element.
• the user can adjust the amount of cleaning liquid discharged per unit time. In addition, the user has the opportunity to completely close the liquid delivery member to stop the delivery of cleaning liquid.
• a check valve 34 is arranged in the pressure line 30, . During the delivery of pressurized cleaning fluid, the check valve 34 assumes its open position. If the dispensing of cleaning liquid ends, the check valve can assume its closed position.
• the cylinder head 16 has an overflow valve chamber 36 which is configured as a blind bore and which opens into the end face 38 of the cylinder head 16 facing away from the engine 12.
• the spill valve chamber 36 has a bottom 40, and in its end facing away from the bottom 40 has the spill valve chamber 36 has an internal thread 42.
• the first line section 44 connects a region of the pressure line 30 arranged upstream of the check valve 34 to the region of the overflow valve chamber 36 adjacent to the bottom 40.
• a control line 48 Adjacent to the internal thread 42, a control line 48 opens into the overflow valve chamber 36 and connects a region of the pressure line 30 arranged downstream of the check valve 34 to the region of the overflow valve chamber 36 adjacent to the internal thread 42.
• the cylinder head 16 In the area between the overflow valve chamber 36 and the suction line 24, the cylinder head 16 has a pressure relief valve chamber 50, which is also designed as a blind bore and opens in the area between the spill valve chamber 36 and the suction line 24 in the end face 38 of the cylinder head 16.
• the pressure relief valve chamber 50 has a bottom 52 and is liquid-tightly closed by means of a screwed into the pressure relief valve chamber 50 sealing plug 54.
• a pressure relief line 58 Adjacent to the plug 54 in the pressure relief valve chamber 50, a pressure relief line 58, via which the region of the spill valve chamber 36 adjacent to the internal thread 42 of the spill valve chamber 36 communicates with the pressure relief valve chamber 50.
• the second line section 60 connects the spill valve chamber 36 and the pressure relief valve chamber 50 to the suction line 24.
• the second line section 60 has a first section 61 and a second section 63.
• the first portion 61 extends from a central portion of the spill valve chamber 36 to a central portion of the pressure relief valve chamber 50, and the second portion 63 extends from the central portion of the pressure relief valve chamber 50 to the suction line 24.
• the overflow valve chamber 36 accommodates an overflow device 65, which is configured as a partially preassembled structural unit and can be inserted into the overflow valve chamber 36.
• the overflow device 65 comprises an overflow valve 62.
• the overflow valve 62 has an overflow valve body 64 with a cone 66, to which a cylindrical extension 68 connects in the direction of the end face 38 of the cylinder head 16.
• the cone 66 is urged by a spill valve spring 70 against a spill valve seat 72.
• the overflow valve spring 70 is supported, on the one hand, on the bottom 40 of the overflow valve chamber 36 and, on the other hand, on the cone 66.
• the overflow valve seat 72 is formed by a sleeve-shaped valve seat element 74, which surrounds the cone 66 and the cylindrical extension 68 in the circumferential direction and, with the interposition of a sealing ring, rests in a liquid-tight manner against the wall of the overflow valve chamber 36.
• a sleeve-shaped valve seat element 74 which surrounds the cone 66 and the cylindrical extension 68 in the circumferential direction and, with the interposition of a sealing ring, rests in a liquid-tight manner against the wall of the overflow valve chamber 36.
• an inner sleeve 76 is inserted, which forms in combination with the valve seat member 74, a swirl chamber 78, which is arranged downstream of the spill valve seat 72 in which the cone 66 surrounding in the circumferential direction annular space.
• the spill valve body 64 is displaceable against the force of the spill valve spring 70 in the spill valve chamber 36, so that it starts from a closed position in which it rests liquid-tight on the overflow valve seat 72, an adjustable distance to the spill valve seat 72 can take.
• the spill valve 62 For controlling the overflow valve body 64, that is, for positioning the spill valve body 64 at a desired distance to the spill valve seat 72, the spill valve 62 has an actuator in the form of a control piston 80 which is slidably mounted in a coaxial with the sleeve-shaped valve seat member 74 aligned sliding sleeve 82.
• the sliding sleeve 82 has an external thread 84, which is screwed to the internal thread 42 of the spill valve 36.
• the sliding sleeve 82 forms a sealing plug 86, which closes the overflow valve chamber 36 in a liquid-tight manner and which has a central opening 88 which is penetrated by a piston rod 90 connected in one piece with the control piston 80.
• the piston rod 90 In its protruding from the spill valve 36 region, the piston rod 90 is surrounded by a helical biasing spring 92 which is clamped between the plug 86 and a held on the piston rod 90 spring plate 94.
• the sliding sleeve 82 Adjacent to the external thread 84, the sliding sleeve 82 has an annular groove 96 running around in the circumferential direction, to which a radial bore 98 adjoins.
• the control line 48 opens at the level of the annular groove 96 in the spill valve chamber 36, so that the control piston 80 on its side facing away from the overflow valve body 64 via the control line 48, the
• Ring groove 96 and the radial bore 98 with the downstream of the check valve 34 in the pressure line 30 prevailing pressure of the cleaning liquid can be acted upon.
• the spill valve chamber 36 via the pressure relief line 58 with the pressure relief valve chamber 50 in connection.
• the control piston 80 carries on its side facing the overflow valve body 64 a pin 100.
• This pressure in turn depends on the flow resistance of the liquid delivery member.
• a pressure relief valve 102 used in the form of a preassembled unit.
• the pressure relief valve 102 has a valve sleeve 104, the liquid-tight manner with the interposition of a first sealing ring 106 and a second sealing ring 108 against the wall of the pressure relief valve chamber 50 and is surrounded within the pressure relief valve chamber 50 in the region between the two sealing rings 106, 108 of an annulus 110.
• the annular space 110 is arranged at the level of the second line section 60 of the overflow line 46.
• the first section 61 of the second line section 60 connects the inner region 112 of the overflow valve 62 arranged between the cone 66 and the control piston 80 with the annular space 110, and the second section 63 of the second line section 60 connects the annular space 110 with the suction line 24.
• valve sleeve 104 of the pressure relief valve 102 Inserted into the valve sleeve 104 of the pressure relief valve 102 is an annular, centrally perforated pressure relief valve seat member 114 which forms a pressure relief valve seat 116.
• a pressure relief valve body 118 is pressed against the pressure relief valve seat 116 by a pressure relief valve spring 120.
• the valve sleeve 104 forms a support ring 122, on which the pressure relief valve spring 120 is supported and which is penetrated by a guide pin 124. About the guide pin 124 of the pressure relief valve body 118 is acted upon by the force of the pressure relief valve spring 120.
• the guide pin 124 projects into an end region of the valve sleeve 104 adjacent to the bottom 52 of the pressure relief valve chamber 50, which prevails via the pressure channel 56 and the first line section 44 of the overflow line 46 with the upstream of the check valve 34 in the pressure line 30 Pressure of the cleaning liquid can be applied.
• the pressure relief valve body 118 can thus be acted upon on its side facing away from the pressure relief valve seat 116 by the pressure of the cleaning fluid prevailing upstream of the check valve 34, and on its side facing the pressure relief valve seat 116 the pressure relief valve body 118 can be connected via the pressure relief line 58, the annular groove 96 and the control line 48 is acted upon by the pressure of the cleaning liquid prevailing downstream of the check valve 34.
• the pressure downstream of the check valve 34 is identical to the pressure upstream of the check valve 34 except for small pressure losses that the cleaning fluid experiences in the area of the check valve 34, and the pressure relief valve body 118 reliably becomes against the pressure relief valve seat under the action of the pressure relief valve spring 120 116 pressed.
• the overflow valve body 64 at the delivery of pressurized cleaning liquid at a distance to the spill valve seat 72 which depends on the pressure prevailing downstream of the check valve 34 pressure of the cleaning liquid.
• the greater the flow resistance of the liquid delivery member the greater the pressure the cleaning liquid, which acts against the biasing force of the biasing spring 92 on the control piston 80 and the greater the distance that the spill valve body 64 occupies the spill valve seat 72. If the flow resistance of the liquid delivery member is rather low, then the pressure of the cleaning liquid downstream of the check valve 34 is rather low, and this in turn has the result that the spill valve body 64 occupies a small distance to the overflow valve seat 72. By changing the flow resistance of the liquid delivery member, the distance that the spill valve body 64 assumes to the spill valve seat 72 can thus be changed.
• the pressure relief valve body 118 is reliably pressed against the pressure relief valve seat 116 by the pressure relief valve spring 120.
• a relatively small force of the pressure relief valve spring 120 is sufficient because the pressure acting on the pressure relief valve seat 116 on the pressure relief valve body 118 is approximately equal to the pressure acting on the pressure relief valve body 118 on the pressure relief valve seat 118.
• the pressure of the cleaning liquid prevailing downstream of the check valve 34 in the pressure line 30 increases under the continuous action of the pump.
• the spill valve body 64 is displaced by the control piston 80 in its maximum overflow valve seat 72 position, so that the upstream of the check valve 34 prevailing pressure on the overflow line 46 and the spill valve 62 is greatly lowered by the pressurized liquid is returned from the pressure line 30 via the overflow line 46 and the overflow valve 62 to the suction line 24.
• the pump 14 can be operated in this state with relatively little energy consumption in the circuit or switched off.
• the strong falling pressure in the overflow line 46 leads to a strong pressure difference between the pressure on the the Pressure Relief Valve Seat 116 facing side of the pressure relief valve body 118 acts, and the pressure acting on the pressure relief valve seat 116 side facing away from the pressure relief valve body 118.
• a limit pressure is exceeded, the pressure relief valve 102 opens by the pressure relief valve body 118 is moved against the force of the pressure relief valve spring 120 from its closed position to an open position.

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Cited By (2)

Citations (3)

Family Cites Families (13)

• 2017
  • 2017-06-29 HU HUE17734087A patent/HUE060337T2/hu unknown
  • 2017-06-29 WO PCT/EP2017/066194 patent/WO2019001720A1/de unknown
  • 2017-06-29 CN CN201780090186.6A patent/CN110603109A/zh active Pending
  • 2017-06-29 EP EP17734087.4A patent/EP3645179B1/de active Active

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