EP3442722A1 - Valve pistol for a high-pressure cleaning device - Google Patents

Valve pistol for a high-pressure cleaning device

Info

Publication number
EP3442722A1
EP3442722A1 EP16716870.7A EP16716870A EP3442722A1 EP 3442722 A1 EP3442722 A1 EP 3442722A1 EP 16716870 A EP16716870 A EP 16716870A EP 3442722 A1 EP3442722 A1 EP 3442722A1
Authority
EP
European Patent Office
Prior art keywords
valve
channel
gun according
ring
sealing ring
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
EP16716870.7A
Other languages
German (de)
French (fr)
Other versions
EP3442722B1 (en
Inventor
Martin EFFERL
Bernd Rommel
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 EP3442722A1 publication Critical patent/EP3442722A1/en
Application granted granted Critical
Publication of EP3442722B1 publication Critical patent/EP3442722B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3013—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the controlling element being a lift valve
    • B05B1/302—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the controlling element being a lift valve with a ball-shaped valve member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/002—Manually-actuated controlling means, e.g. push buttons, levers or triggers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/002—Manually-actuated controlling means, e.g. push buttons, levers or triggers
    • B05B12/0022—Manually-actuated controlling means, e.g. push buttons, levers or triggers associated with means for restricting their movement
    • B05B12/0024—Manually-actuated controlling means, e.g. push buttons, levers or triggers associated with means for restricting their movement to a single position
    • B05B12/0026—Manually-actuated controlling means, e.g. push buttons, levers or triggers associated with means for restricting their movement to a single position to inhibit delivery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/14—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/01—Spray pistols, discharge devices
    • 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
    • B08B3/028—Spray guns

Definitions

  • the invention relates to a valve gun for a high-pressure cleaner, comprising a valve having a valve housing with a passage extending from an inlet to an outlet, having a first channel portion in which a valve seat and in a closed position under the action of a closing spring Valve seat adjacent closing body are arranged, wherein the closing body is movable by displacing a valve stem in an open position spaced from the valve seat and the valve stem surrounded by a sealing ring engages through an opening into the first channel section plunger channel and is mechanically coupled outside of the valve housing with a pivotable about a pivot axis release lever ,
  • valve gun By means of such a valve gun, the discharge of cleaning liquid pressurized by a high-pressure cleaner can be controlled.
  • the cleaning liquid water is usually used, to which a cleaning chemical may be mixed.
  • the valve gun has a valve with an inlet and an outlet which communicate with each other via a passageway.
  • a pressure hose can be connected to the inlet and, for example, a spray lance can be connected to the outlet.
  • About the pressure hose of the valve gun pressurized cleaning liquid can be supplied, and on the spray lance, the cleaning liquid can be directed to an object.
  • the passage of the valve housing has a preferably rectilinear first channel section.
  • a second channel section may adjoin the first channel section, in particular aligned at an angle to the first channel section, which forms the outlet of the valve housing at its end remote from the first channel section. But it can too be provided that adjoins the second channel section at least one further channel section, via which the second channel section is in flow communication with the outlet of the valve housing.
  • a valve seat In the first channel section, a valve seat is arranged.
  • a closing body is arranged in the first channel portion, which rests under the action of a closing spring on the valve seat and which is movable by displacing a valve stem in an open position spaced from the valve seat. In the open position, the closing body releases the flow connection between the inlet and the outlet of the valve housing, and in the closed position, the closing body interrupts this flow connection.
  • the valve stem protrudes from the valve body. It passes through a plunger channel which opens into the first channel section and is surrounded by a sealing ring within the plunger channel, so that it is ensured that the cleaning fluid can not flow out of the valve housing via the plunger channel.
  • the valve stem Outside the valve housing, the valve stem is mechanically coupled to a pivotable about a pivot axis release lever.
  • the plunger channel may be aligned with the first channel section.
  • the user has the ability to pivot the release lever from a rest position to a release position.
  • the valve stem Under the action of the pivoting movement of the release lever, the valve stem is displaced, so that the closing body lifts off from the valve seat.
  • the closing body Starting from its closed position, the closing body can thus be moved by pivoting the release lever into its open position spaced from the valve seat. The transition of the closing body from the closed position into the open position takes place counter to the closing force, which is exerted by the closing spring on the closing body, and also against the on the
  • the pivoting movement of the release lever can be transferred directly to the valve stem by the release lever rests on the valve lifter.
  • the pivoting movement of the Release lever is transmitted via a mechanical coupling element, for example via a coupling lever pivotally mounted about a coupling axis, on the valve tappet.
  • a valve gun is known from the document EP 1 389 495 A1, in which a valve seat element forming the valve seat is supported with a front side facing away from the inlet of the valve housing against a wall of the passage channel into which the plunger channel opens.
  • the valve seat element has an angled passage with an inlet section adjoining the valve seat and with an outlet section facing away from the valve seat.
  • the document WO 2015/086085 A1 proposes a valve with a valve seat element which, with its front side remote from the inlet of the valve housing, is supported on a stepped constriction of the first channel section.
  • the valve seat member has a straight passage. This facilitates the assembly of the valve seat member, since it does not have to assume a predefined angular position, and reduces the flow resistance of the valve seat member.
  • the cleaning fluid is heated strongly before it is fed to the valve gun.
  • This increases the risk that lime deposits on the valve stem within the valve housing.
  • These limescale deposits can lead to increased roughness of the peripheral surface of the valve stem on which rests the sealing ring surrounding the valve stem.
  • the increased roughness impairs the sealing effect achievable by the sealing ring, and since the valve stem can perform a movement relative to the sealing ring, the lime particles deposited on the valve stem can damage the sealing ring.
  • a corresponding damage to the sealing ring and impairment of its Sealing effect can also be caused by other abrasive particles, such as rust particles, which are carried by the cleaning liquid.
  • Object of the present invention is therefore to develop a valve gun of the type mentioned in such a way that the risk of deterioration of the sealing effect of the valve stem surrounding the sealing ring and damage to the sealing ring is reduced.
  • valve stem is surrounded by a sealing ring arranged adjacent to the scraper, which rests on the valve stem and is held together with the sealing ring by a spaced from the valve seat holding member in the plunger channel.
  • a scraper ring is used, which is arranged adjacent to the sealing ring surrounding the valve lifter in the plunger channel.
  • the wiper ring rests against the valve tappet and is held together with the sealing ring in the tappet channel.
  • a holding element is used for holding the scraper ring and the sealing ring.
  • valve stem If the valve stem is displaced by pivoting the release lever in the plunger channel, it performs relative to the scraper ring, which is held in the plunger channel, a movement, wherein the valve plunger slides along the scraper ring and thereby any lime particles or other abrasive particles deposited on the valve lifter have to be removed from the valve lifter. It is thus ensured that the region of the valve stem, in which the sealing ring rests on the valve stem, is virtually free of lime particles and other abrasive particles and impairment of the sealing effect of the sealing ring can be kept as low as the risk that the sealing ring of the lime particles and other abrasive particles is damaged.
  • an insert part is arranged in the first channel portion, which forms the valve seat, and the holding element is arranged at a distance from the insert part.
  • the insert part does not extend directly to the holding element, but rather forms the first channel section of the through-channel between the insert part and the holding part a free end region. It has been shown that thereby the flow resistance of the valve can be kept low.
  • the holding element itself is fixed in the ram channel.
  • the holding element can be arranged, for example, in an end region of the tappet channel, which extends as far as the passageway of the valve housing.
  • the holding element is configured disk-shaped. This makes it possible to keep the size of the retaining element and thus also the installation space of the valve housing required for mounting the retaining element low.
  • the holding element can be pressed into the valve housing in an advantageous embodiment of the invention.
  • the retaining element can be pressed into the plunger channel.
  • the holding element forms a stamped part or a rotating part. This makes it possible to produce the holding element in comparatively low cost in large quantities.
  • the holding element consists of a flat material, in particular of a sheet metal material.
  • the holding element forms a retaining ring which surrounds the valve tappet.
  • the inner diameter of the retaining ring may be selected to be larger than the outer diameter of the valve stem, so that the movement of the valve stem is not affected by the retaining ring.
  • the retaining ring distributed over its circumference on a plurality of radial extensions.
  • the radial extensions allow cost-effective manner to press the retaining ring with relatively small forces in the plunger channel, with only small tolerance requirements must be placed on the diameter of the plunger channel.
  • the radial extensions can deform so far during the pressing of the retaining ring, that this is reliably held axially immovable in the plunger channel.
  • the retaining ring has an outline in the form of a polygon with rounded corners.
  • Such a configuration also makes it possible to press the retaining ring with relatively small forces in the plunger channel, with only small tolerance requirements must be placed on the diameter of the plunger channel.
  • the rounded corner regions of the polygon rest on the wall of the plunger channel and deform so far that the retaining ring is reliably held axially immovable in the plunger channel.
  • the outline of the retaining ring can form, for example, a square with rounded corners.
  • the retaining element bears against a cross-sectional constriction of the plunger channel.
  • the holding element can be supported in the axial direction with respect to the longitudinal axis of the tappet channel.
  • the sealing ring between the scraper ring and a surrounding the valve stem support ring is arranged, which rests on the valve stem, wherein the scraper ring on the passage of the valve housing side facing the sealing ring and the support ring on the side facing away from the passage channel of the sealing ring is arranged.
  • the support ring avoids a gap extrusion of the sealing ring, i. E. it ensures that under the action of very high liquid pressures, the sealing ring is not squeezed into the narrow gap between the valve tappet and the tappet channel on the side facing away from the passage channel.
  • the support ring bears against an inwardly directed step of the tappet channel.
  • the support ring can be supported in the axial direction with respect to the longitudinal axis of the plunger channel.
  • the holding element joins in an advantageous embodiment of the invention in the direction of the through-channel to the scraper ring.
  • the first channel section forms a free end region between an insert part and the retaining element. It is advantageous if the diameter of the end region is greater than the diameter of a through hole of the insert part. Flow losses of the cleaning liquid can be kept particularly low.
  • the through hole of the insert member may form the smallest diameter portion between the inlet and the outlet of the valve housing. This area can be very short in the flow direction of the cleaning fluid. be designed so that the cleaning liquid suffers only low flow losses when flowing through this area.
  • the through-hole widens continuously in the direction of the end region of the first channel section. Abrupt changes in diameter can be avoided in the area between the through hole of the insert and the end portion.
  • the end portion of the through hole may be configured conical, for example.
  • Figure 1 a schematic sectional view of a valve gun
  • FIG 2 is an enlarged view of a valve of the valve gun of Figure 1;
  • FIG. 3 shows a plan view of a first embodiment of a retaining element of the valve gun of FIG. 1;
  • FIG. 4 shows a plan view of a second embodiment of a holding element of the valve gun of FIG. 1.
  • the valve gun 10 includes a gun housing 12 which is formed in a conventional manner by a first housing shell 14 and a second housing shell, not shown in the drawing.
  • the gun housing 12 has a central housing portion 16 which is disposed between a front housing portion 18 and a rear housing portion 20.
  • the front housing portion 18 receives a valve 22 with a valve housing 24.
  • the valve housing 24 has an inlet 26 and an outlet 28, which communicate with each other via a through-channel 30 in fluid communication.
  • the outlet 28 protrudes from a front side 32 of the pistol housing 12 in the illustrated embodiment. For example, a spray lance can be connected to the outlet 28.
  • the inlet 26 protrudes in the illustrated embodiment from a bottom 34 of the gun housing 12.
  • a pressure hose 36 is connected in the illustrated embodiment.
  • the pressure hose 36 has a hose nipple 38, which can be inserted into the inlet 26 of the valve housing 24 surrounded by a sealing ring and fixed to the valve housing 24 by means of a union nut 40.
  • the union nut 40 is surrounded by a kink protection 42 in the illustrated embodiment.
  • a handle 44 From the rear housing portion 20 of the gun housing 12 is a handle 44, from the free end portion 46 extends in the illustrated embodiment, a protective bracket 48 to the front housing portion 18.
  • the guard 48, the central housing portion 16 and the handle 44 surround an engagement opening 50 into which the user can engage with his fingers.
  • the through-channel 30 has a rectilinear first channel section 52 which adjoins the inlet 26 in the direction of flow 54 of the cleaning fluid and a first radially inwardly directed step 56 and in the flow direction 54 in the flow direction 54 at a distance from the inlet 26 at a distance from the first stage 56 has a second radially inwardly directed step 58.
  • the first channel section 52 forms a free end region 60.
  • Adjoining the free end portion 60 is a second channel portion 62 which is oriented at an angle to the first channel portion 52, that is, the longitudinal axis 64 of the second channel portion 62 is oriented at an angle to the longitudinal axis 66 of the first channel portion 52.
  • the angle between the longitudinal axis 64 and the longitudinal axis 66 is greater than 90 °, the angle is for example 115 °.
  • a third channel section 68 of the through-channel 30 adjoins the second channel section 62.
  • the third channel section 68 extends to the outlet 28 of the valve housing 24.
  • the longitudinal axis 70 of the third channel section 68 is aligned at an angle to the longitudinal axis 64 of the second channel section 62.
  • the longitudinal axis 70 of the third channel section 68 is perpendicular to the longitudinal axis 66 of the first channel section 52.
  • valve housing 24 has a stepped plunger channel 72, which is arranged in alignment with the first channel section 52 and adjoins the free end region 60 of the first channel section 52.
  • the plunger channel 72 extends up to a side facing away from the inlet 26 top 74 of the valve housing 24th
  • an insert 76 is arranged, which is cylindrical and with a side facing away from the inlet 26 end face 78 rests against the second step 58.
  • the insert 76 has a rectilinear through-bore 80 which extends from a valve seat 82 facing the inlet 26 of the insert 76 to the end 78, wherein an end face 78 of the immediately adjacent end portion of the through-hole 80 forms a conical widening 84.
  • the diameter of the through-hole 80 upstream of the extension 84 is set smaller than the diameter of the free end portion 60 of the first channel portion 52.
  • a closing body 86 is arranged in the first channel section 52, which is configured spherical in the illustrated embodiment. In the closed position shown in Figures 1 and 2, the closing body 86 abuts the valve seat 82. By means of a closing spring 88, the closing body 86 is acted upon by a closing force, so that it is pressed against the valve seat 82.
  • the closing spring 88 is supported by her the closing body 86 facing the end of a first spring holder 90, which bears against the closing body 86, and with its end facing away from the closing body 86, the closing spring 88 is supported on a second spring holder 92 which is inserted into the first channel portion 52 and with a radial outwardly directed flange 94 abuts the first step 56 of the first channel section 52.
  • the ram channel 72 has an outgoing from the top 74 of the valve housing 24 input section 96, which merges via an outwardly directed first stepped extension 98 into a central channel section 100, to which a second stepped extension 102, an output section 104 connects, in the free end portion 60 of the first channel portion 52 opens.
  • the plunger channel 72 is penetrated by a valve stem 106, which extends to the closing body 86 and protrudes with its free end 108 from the top 74 of the valve housing 24.
  • valve tappet 106 In the region of the central channel section 100, the valve tappet 106 is surrounded by a support ring 110 and a wiper ring 112. Between the support ring 110 and the scraper ring 112, a sealing ring 114 is arranged, which surrounds the valve tappet 106. The sealing ring 114 bears tightly against the outer circumference of the valve tappet 106 as well as against the wall of the central channel section 100, thereby ensuring that cleaning fluid can not flow out of the through-channel 30 via the tappet channel 72.
  • the support ring 110 lies with its upper side facing away from the sealing ring 114 on the first stepped extension 98 of the plunger channel 72 and avoids a gap extrusion of the sealing ring 114, ie it ensures that the sealing ring 114 under the action of very high liquid pressures not in the gap between the Valve tappet 106 and the wall of the input portion 96 of the plunger channel 72 is squeezed.
  • the wiper ring 112 bears with its inner edge on the valve tappet 106, so that the valve tappet 106 is stripped off during a movement relative to the wiper ring 112 from the wiper ring 112.
  • the valve 22 has a holding element 116.
  • a first advantageous embodiment of the retaining element 116 is shown enlarged in FIG. 3 in the form of a retaining ring 117.
  • the retaining ring 117 is made as a stamped part of a sheet material and has radial extensions 120 with an arcuate outer contour, which are arranged distributed uniformly over its outer periphery 118.
  • a second advantageous embodiment of the retaining element 116 is shown enlarged in FIG. 4 in the form of a retaining ring 119.
  • the retaining ring 119 is made as a turned part of a square material and has an outline in the form of a polygon with rounded corners 121.
  • the holding element 116 is pressed into the output section 104 of the plunger channel 72 and abuts against the second stepped extension 102 of the plunger channel 72. With the aid of the retaining element 116, the support ring 110, the scraper ring 112 and the sealing ring 114 are held in the middle channel section 100 of the plunger channel 72.
  • the valve stem 106 can be displaced by pivoting a release lever 122 in the direction of the inlet 26, so that the closing body 86 lifts against the closing force of the closing spring 88 from the valve seat 82 and thereby releases the flow connection between the inlet 26 and the outlet 28.
  • the release lever 122 is arranged in the handle 44 and mounted pivotably about a pivot axis 124 on the first housing shell 14 and the second housing shell. It can be moved by the user with the heel of his hand from his rest position shown in FIG. 1 in the direction of the front. housing area 18 are pivoted.
  • the pivot axis 124 of the release lever 122 is disposed in the free end region 46 of the handle 44. In its rest position, the release lever 122 protrudes with an actuating surface 128 out of the front housing region 18 facing away from the back of the handle 44.
  • the trigger lever 122 is acted upon by a first return spring 130 with a resilient restoring force. Under the action of the first return spring 130, the release lever 122 automatically assumes its rest position when the user releases the release lever 122.
  • the release lever 122 In its rest position, the release lever 122 is automatically locked by means of a first locking member 132.
  • the substantially L-shaped first locking member 132 is pivotally mounted in the handle 44.
  • a first leg 134 of the first locking member 132 protrudes in the rest position of the trigger lever 122 out of the front housing portion 18 facing front of the handle 44 out.
  • a the trigger lever 122 facing the second leg 136 of the first locking member 132 is in the rest position of the trigger lever 122 with its free end 140 on the trigger lever 122 and prevents it from pivoting movement.
  • a second return spring 142 By means of a second return spring 142, the first locking member 132 is pressed into its locking position shown in Figure 1.
  • the first locking member 132 When the user grasps the handle 44 with his hand, he intuitively pivots the first locking member 132 counter to the spring force of the second return spring 142 into a position in which the second leg 136 can dip into a recess 144 of the release lever 122 and thereby the finger Release lever 122 from the first locking member 132 freely pivots about the pivot axis 124. If the user releases the handle 44 again, the trigger lever 122 is automatically pivoted by the first return spring 130 into its rest position and the first locking member 132 is pivoted by the second return spring 142 in the locking position in which it locks the release lever 122.
  • a pivoting movement of the trigger lever 122 in the direction of the front housing portion 18 is transmitted to the valve tappet 106 via a coupling lever 146 arranged in the central housing region 16.
  • the coupling lever 146 is pivotably mounted on the valve housing 24 about a coupling axis 148.
  • the coupling axis 148 is aligned parallel to the pivot axis 124.
  • the coupling lever 146 has an adjustable force-applying element 150, which rests against the free end of the valve tappet 106.
  • the coupling lever 146 has a first coupling roller 154 and a second coupling roller 156, which, when the release lever 122 pivots in the direction of the front housing section 18, successively slide along a section of a guide track 158 is formed by a the coupling lever 146 facing end face 160 of the trigger lever 122.
  • the trigger lever 122 is pivoted in the direction of the front housing portion 18, first the first coupling roller 154 slides along a rear end region of the guide track 158 and the coupling lever 146 is pivoted such that the force application element 150 moves the valve lifter 106 in the direction of the inlet 26 of the valve housing 24 shifts.
  • the first coupling roller 154 lifts from the guide track 158 and the second coupling roller 156 moves along a front portion of the guide track 158, so that the coupling lever 146 is further pivoted and thereby the valve lifter 106 is further shifted until the closing body 86 reaches its open position.
  • the release lever 122 is, as already mentioned, pivoted back by the first return spring 130 in its rest position and simultaneously the coupling lever 146 is pivoted back from the valve stem 106 to its original position, since the valve stem 106 on the Closing member 86 is acted upon by the closing spring 88 with a restoring force.
  • the closing body 86 in this case assumes its closed position, in which it bears against the valve seat 82 again. If the valve gun 10 is to be taken out of service, then the user can lock the coupling lever 146 and via this also the trigger lever 122 by means of a second locking member 162.
  • the second locking member 162 is configured as a sliding body 164, which can be moved back and forth above the coupling lever 146 on the gun housing 12 between a blocking position shown in Figure 1 and a parking position, not shown in the drawing.
  • the sliding body 164 has a locking cam 166, which abuts directly in the blocking position on the upper side of the coupling lever 146 facing away from the trigger lever 122 or is arranged at a small distance to the top of the coupling lever 146 and prevents the coupling lever 146 from pivoting. From the blocking position, the sliding body 164 can be moved backwards in the direction away from the front housing region 18, in which the locking cam 166 releases the coupling lever 146.
  • the sliding body 164 can be locked in the blocking position and in the parking position with the gun housing 12.
  • the reciprocating movement of the valve tappet 106 has the consequence that lime particles and other abrasive particles, for example rust particles, which deposit on the valve tappet 106 are stripped off by the valve tappet 106 with the aid of the wiper ring 112.
  • the valve stem 106 therefore has only a small roughness in its stripped area even after a long period of use.
  • the stripped area of the sealing ring 114 is close to the valve stem 106 and the sealing effect of the sealing ring 114 is not affected by lime particles and other abrasive particles.
  • a damage of the sealing ring 114 by lime particles or other abrasive particles can be avoided by the use of the scraper ring 112 held in the ram channel 72.
  • the passage 30 has a relatively large diameter and therefore forms only a small flow resistance for the cleaning liquid.
  • the free end region 60 of the first channel section 52 a considerable diameter.
  • the region with the smallest flow cross-section is formed by the through-bore 80 of the insert part 76.
  • the through-bore 80 can be made relatively short, so that the cleaning fluid suffers only small flow losses in the region of the insert 76.

Landscapes

  • Lift Valve (AREA)

Abstract

The invention relates to a valve pistol for a high-pressure cleaning device, having a valve (22) which has a valve housing (24) with a passage duct (30), which passage duct has a first duct section (52) in which there are arranged a valve seat (82) and a closing body (86) which, in a closed position, bears against the valve seat (82), wherein the closing body (76) is movable into an open position by displacement of a valve plunger (106), and the valve plunger (106), surrounded by a sealing ring (114), extends through a plunger duct (72) which opens into the first duct section (52), and, outside the valve housing (84), said valve plunger is mechanically coupled to a release lever (122). To further develop the valve pistol (10) such that the risk of an impairment of the sealing action of the sealing ring (114), and damage to the sealing ring (114), is reduced, it is proposed that the valve plunger (106) be surrounded by a stripper ring (110, 112) which is arranged adjacent to the sealing ring (114) and which bears against the valve plunger (106) and which is held together with the sealing ring (114) in the plunger duct (72) by a holding element (116) which is arranged with a spacing to the valve seat (82).

Description

VENTILPISTOLE FÜR EIN HOCHDRUCKREINIGUNGSGERÄT  VALVE PISTOL FOR A HIGH-PRESSURE CLEANING UNIT
Die Erfindung betrifft eine Ventilpistole für ein Hochdruckreinigungsgerät, mit einem Ventil, das ein Ventilgehäuse aufweist mit einem sich von einem Einlass zu einem Auslass erstreckenden Durchgangskanal, der einen ersten Kanalabschnitt aufweist, in dem ein Ventilsitz und ein in einer Schließstellung unter der Wirkung einer Schließfeder am Ventilsitz anliegender Schließkörper angeordnet sind, wobei der Schließkörper durch Verschieben eines Ventilstößels in eine zum Ventilsitz beabstandete Offenstellung bewegbar ist und der Ventilstößel von einem Dichtring umgeben einen in den ersten Kanalabschnitt einmündenden Stößelkanal durchgreift und außerhalb des Ventilgehäuses mechanisch mit einem um eine Schwenkachse verschwenkbaren Auslösehebel gekoppelt ist. The invention relates to a valve gun for a high-pressure cleaner, comprising a valve having a valve housing with a passage extending from an inlet to an outlet, having a first channel portion in which a valve seat and in a closed position under the action of a closing spring Valve seat adjacent closing body are arranged, wherein the closing body is movable by displacing a valve stem in an open position spaced from the valve seat and the valve stem surrounded by a sealing ring engages through an opening into the first channel section plunger channel and is mechanically coupled outside of the valve housing with a pivotable about a pivot axis release lever ,
Mit Hilfe einer derartigen Ventilpistole kann die Abgabe von Reinigungsflüssigkeit, die von einem Hochdruckreinigungsgerät unter Druck gesetzt wurde, gesteuert werden. Als Reinigungsflüssigkeit wird üblicherweise Wasser verwendet, dem eine Reinigungschemikalie beigemischt sein kann. Die Ventilpistole weist ein Ventil auf mit einem Einlass und einem Auslass, die über einen Durchgangskanal miteinander in Strömungsverbindung stehen. An den Einlass kann beispielsweise ein Druckschlauch angeschlossen werden, und an den Auslass kann beispielsweise eine Sprühlanze angeschlossen werden. Über den Druckschlauch kann der Ventilpistole unter Druck stehende Reinigungsflüssigkeit zugeführt werden, und über die Sprühlanze kann die Reinigungsflüssigkeit auf einen Gegenstand gerichtet werden. By means of such a valve gun, the discharge of cleaning liquid pressurized by a high-pressure cleaner can be controlled. As the cleaning liquid, water is usually used, to which a cleaning chemical may be mixed. The valve gun has a valve with an inlet and an outlet which communicate with each other via a passageway. For example, a pressure hose can be connected to the inlet and, for example, a spray lance can be connected to the outlet. About the pressure hose of the valve gun pressurized cleaning liquid can be supplied, and on the spray lance, the cleaning liquid can be directed to an object.
Der Durchgangskanal des Ventilgehäuses weist einen vorzugsweise geradlinigen ersten Kanalabschnitt auf. An den ersten Kanalabschnitt kann sich, insbesondere in einem Winkel zum ersten Kanalabschnitt ausgerichtet, ein zweiter Kanalabschnitt anschließen, der an seinem dem ersten Kanalabschnitt abgewandten Ende den Auslass des Ventilgehäuses ausbildet. Es kann aber auch vorgesehen sein, dass sich an den zweiten Kanalabschnitt mindestens ein weiterer Kanalabschnitt anschließt, über den der zweite Kanalabschnitt mit dem Auslass des Ventilgehäuses in Strömungsverbindung steht. The passage of the valve housing has a preferably rectilinear first channel section. A second channel section may adjoin the first channel section, in particular aligned at an angle to the first channel section, which forms the outlet of the valve housing at its end remote from the first channel section. But it can too be provided that adjoins the second channel section at least one further channel section, via which the second channel section is in flow communication with the outlet of the valve housing.
Im ersten Kanalabschnitt ist ein Ventilsitz angeordnet. Außerdem ist im ersten Kanalabschnitt ein Schließkörper angeordnet, der unter der Wirkung einer Schließfeder am Ventilsitz anliegt und der durch Verschieben eines Ventilstößels in eine zum Ventilsitz beabstandete Offenstellung bewegbar ist. In der Offenstellung gibt der Schließkörper die Strömungsverbindung zwischen dem Einlass und dem Auslass des Ventilgehäuses frei, und in der Schließstellung unterbricht der Schließkörper diese Strömungsverbindung . Der Ventilstößel ragt aus dem Ventilgehäuse heraus. Er durchgreift einen in den ersten Kanalabschnitt einmündenden Stößelkanal und ist innerhalb des Stößelkanals von einem Dichtring umgeben, so dass sichergestellt ist, dass die Reinigungsflüssigkeit nicht über den Stößelkanal aus dem Ventilgehäuse herausströmen kann. Außerhalb des Ventilgehäuses ist der Ventilstößel mechanisch mit einem um eine Schwenkachse verschwenkbaren Auslösehebel gekoppelt. Der Stößelkanal kann fluchtend zum ersten Kanalabschnitt ausgerichtet sein. In the first channel section, a valve seat is arranged. In addition, a closing body is arranged in the first channel portion, which rests under the action of a closing spring on the valve seat and which is movable by displacing a valve stem in an open position spaced from the valve seat. In the open position, the closing body releases the flow connection between the inlet and the outlet of the valve housing, and in the closed position, the closing body interrupts this flow connection. The valve stem protrudes from the valve body. It passes through a plunger channel which opens into the first channel section and is surrounded by a sealing ring within the plunger channel, so that it is ensured that the cleaning fluid can not flow out of the valve housing via the plunger channel. Outside the valve housing, the valve stem is mechanically coupled to a pivotable about a pivot axis release lever. The plunger channel may be aligned with the first channel section.
Zur Steuerung der Flüssigkeitsabgabe hat der Benutzer die Möglichkeit, den Auslösehebel aus einer Ruhestellung in eine Freigabestellung zu verschwenken. Unter der Wirkung der Schwenkbewegung des Auslösehebels wird der Ventilstößel verschoben, so dass der Schließkörper vom Ventilsitz abhebt. Ausgehend von seiner Schließstellung kann der Schließkörper somit durch Verschwenken des Auslösehebels in seine zum Ventilsitz beabstandete Offenstellung bewegt werden. Der Übergang des Schließkörpers aus der Schließstellung in die Offenstellung erfolgt entgegen der Schließkraft, die von der Schließfeder auf den Schließkörper ausgeübt wird, und auch entgegen dem auf den To control the liquid delivery, the user has the ability to pivot the release lever from a rest position to a release position. Under the action of the pivoting movement of the release lever, the valve stem is displaced, so that the closing body lifts off from the valve seat. Starting from its closed position, the closing body can thus be moved by pivoting the release lever into its open position spaced from the valve seat. The transition of the closing body from the closed position into the open position takes place counter to the closing force, which is exerted by the closing spring on the closing body, and also against the on the
Schließkörper einwirkenden Druck der Reinigungsflüssigkeit. Closing body acting pressure of the cleaning liquid.
Die Schwenkbewegung des Auslösehebels kann unmittelbar auf den Ventilstößel übertragen werden, indem der Auslösehebel am Ventilstößel anliegt. Es kann allerdings auch vorgesehen sein, dass die Schwenkbewegung des Aus- lösehebels über ein mechanisches Kopplungselement, beispielsweise über einen um eine Kopplungsachse schwenkbar gelagerten Kopplungshebel, auf den Ventilstößel übertragen wird. The pivoting movement of the release lever can be transferred directly to the valve stem by the release lever rests on the valve lifter. However, it can also be provided that the pivoting movement of the Release lever is transmitted via a mechanical coupling element, for example via a coupling lever pivotally mounted about a coupling axis, on the valve tappet.
Aus dem Dokument EP 1 389 495 AI ist eine Ventilpistole bekannt, bei der sich ein den Ventilsitz ausbildendes Ventilsitzelement mit einer dem Einlass des Ventilgehäuses abgewandten Stirnseite an einer Wand des Durchgangskanals abstützt, in die der Stößelkanal einmündet. Das Ventilsitzelement weist einen gewinkelten Durchlass auf mit einem sich an den Ventilsitz anschließenden Eingangsabschnitt und mit einem dem Ventilsitz abgewandten Ausgangsabschnitt. Bei der Montage des Ventilsitzelements muss darauf geachtet werden, dass der Ausgangsabschnitt fluchtend zu einem zweiten Kanalabschnitt des Durchgangskanals des Ventilgehäuses ausgerichtet ist. Dies erschwert die Montage des Ventilsitzelements. Außerdem bildet der gewinkelte Durchlass für die Reinigungsflüssigkeit einen beträchtlichen Strömungswiderstand aus. A valve gun is known from the document EP 1 389 495 A1, in which a valve seat element forming the valve seat is supported with a front side facing away from the inlet of the valve housing against a wall of the passage channel into which the plunger channel opens. The valve seat element has an angled passage with an inlet section adjoining the valve seat and with an outlet section facing away from the valve seat. When installing the valve seat member, care must be taken that the outlet portion is aligned with a second passage portion of the passageway of the valve body. This complicates the mounting of the valve seat member. In addition, the angled passage for the cleaning fluid forms a considerable flow resistance.
In dem Dokument WO 2015/086085 AI wird ein Ventil mit einem Ventilsitzelement vorgeschlagen, das sich mit seiner dem Einlass des Ventilgehäuses abgewandten Stirnseite an einer stufigen Verengung des ersten Kanalabschnitts abstützt. Das Ventilsitzelement weist einen geradlinigen Durchlass auf. Dies erleichtert die Montage des Ventilsitzelements, da es keine vordefinierte Winkelstellung einnehmen muss, und reduziert den Strömungswiderstand des Ventilsitzelements. The document WO 2015/086085 A1 proposes a valve with a valve seat element which, with its front side remote from the inlet of the valve housing, is supported on a stepped constriction of the first channel section. The valve seat member has a straight passage. This facilitates the assembly of the valve seat member, since it does not have to assume a predefined angular position, and reduces the flow resistance of the valve seat member.
In vielen Fällen wird die Reinigungsflüssigkeit, bevor sie der Ventilpistole zugeführt wird, stark erhitzt. Dies erhöht das Risiko, dass sich innerhalb des Ventilgehäuses Kalk am Ventilstößel ablagert. Diese Kalkablagerungen können zu einer verstärkten Rauigkeit der Umfangsfläche des Ventilstößels führen, an der der den Ventilstößel umgebende Dichtring anliegt. Die erhöhte Rauigkeit beeinträchtigt die vom Dichtring erzielbare Dichtwirkung, und da der Ventilstößel eine Bewegung relativ zum Dichtring ausführen kann, können die am Ventilstößel abgelagerten Kalkpartikel den Dichtring beschädigen. Eine entsprechende Beschädigung des Dichtrings und Beeinträchtigung von dessen Dichtwirkung kann auch durch sonstige abrasive Partikel, beispielsweise Rostpartikel, bewirkt werden, die von der Reinigungsflüssigkeit mitgeführt werden. In many cases, the cleaning fluid is heated strongly before it is fed to the valve gun. This increases the risk that lime deposits on the valve stem within the valve housing. These limescale deposits can lead to increased roughness of the peripheral surface of the valve stem on which rests the sealing ring surrounding the valve stem. The increased roughness impairs the sealing effect achievable by the sealing ring, and since the valve stem can perform a movement relative to the sealing ring, the lime particles deposited on the valve stem can damage the sealing ring. A corresponding damage to the sealing ring and impairment of its Sealing effect can also be caused by other abrasive particles, such as rust particles, which are carried by the cleaning liquid.
Aufgabe der vorliegenden Erfindung ist es daher, eine Ventilpistole der eingangs genannten Art derart weiterzubilden, dass die Gefahr einer Beeinträchtigung der Dichtwirkung des den Ventilstößel umgebenden Dichtrings und eine Beschädigung des Dichtrings verringert wird. Object of the present invention is therefore to develop a valve gun of the type mentioned in such a way that the risk of deterioration of the sealing effect of the valve stem surrounding the sealing ring and damage to the sealing ring is reduced.
Diese Aufgabe wird bei einer gattungsgemäßen Ventilpistole erfindungsgemäß dadurch gelöst, dass der Ventilstößel von einem benachbart zum Dichtring angeordneten Abstreifring umgeben ist, der am Ventilstößel anliegt und zusammen mit dem Dichtring von einem im Abstand zum Ventilsitz angeordneten Halteelement im Stößelkanal gehalten ist. This object is achieved in a generic valve gun according to the invention in that the valve stem is surrounded by a sealing ring arranged adjacent to the scraper, which rests on the valve stem and is held together with the sealing ring by a spaced from the valve seat holding member in the plunger channel.
Bei der erfindungsgemäßen Ventilpistole kommt ein Abstreifring zum Einsatz, der benachbart zu dem den Ventilstößel umgebenden Dichtring im Stößelkanal angeordnet ist. Der Abstreifring liegt am Ventilstößel an und wird zusammen mit dem Dichtring im Stößelkanal gehalten. Zur Halterung des Abstreifrings und des Dichtrings kommt ein Halteelement zum Einsatz. In the case of the valve pistol according to the invention, a scraper ring is used, which is arranged adjacent to the sealing ring surrounding the valve lifter in the plunger channel. The wiper ring rests against the valve tappet and is held together with the sealing ring in the tappet channel. For holding the scraper ring and the sealing ring, a holding element is used.
Wird der Ventilstößel durch Verschwenken des Auslösehebels im Stößelkanal verschoben, so führt er relativ zu dem Abstreifring, der im Stößelkanal gehalten ist, eine Bewegung aus, wobei der Ventilstößel an dem Abstreifring entlanggleitet und dadurch etwaige Kalkpartikel oder sonstige abrasive Partikel, die sich am Ventilstößel abgeschieden haben, vom Ventilstößel entfernt werden. Es wird somit sichergestellt, dass der Bereich des Ventilstößels, in dem der Dichtring am Ventilstößel anliegt, praktisch frei von Kalkpartikeln und sonstigen abrasiven Partikeln ist und eine Beeinträchtigung der Dichtwirkung des Dichtrings ebenso gering gehalten werden kann wie die Gefahr, dass der Dichtring von den Kalkpartikeln und sonstigen abrasiven Partikeln beschädigt wird . Bevorzugt ist im ersten Kanalabschnitt ein Einsatzteil angeordnet, das den Ventilsitz ausbildet, und das Halteelement ist im Abstand zum Einsatzteil angeordnet. Die Festlegung des Abstreifrings und des den Ventilstößel umgebenden Dichtrings erfolgt mittels eines Halteelements, das im Abstand zum Einsatzteil angeordnet ist. Das Einsatzteil erstreckt sich also nicht bis unmittelbar an das Halteelement, vielmehr bildet der erste Kanalabschnitt des Durchgangskanals zwischen dem Einsatzteil und dem Halteteil einen freien Endbereich aus. Es hat sich gezeigt, dass dadurch der Strömungswiderstand des Ventils gering gehalten werden kann. If the valve stem is displaced by pivoting the release lever in the plunger channel, it performs relative to the scraper ring, which is held in the plunger channel, a movement, wherein the valve plunger slides along the scraper ring and thereby any lime particles or other abrasive particles deposited on the valve lifter have to be removed from the valve lifter. It is thus ensured that the region of the valve stem, in which the sealing ring rests on the valve stem, is virtually free of lime particles and other abrasive particles and impairment of the sealing effect of the sealing ring can be kept as low as the risk that the sealing ring of the lime particles and other abrasive particles is damaged. Preferably, an insert part is arranged in the first channel portion, which forms the valve seat, and the holding element is arranged at a distance from the insert part. The determination of the scraper ring and the surrounding the valve stem sealing ring by means of a holding element, which is arranged at a distance from the insert part. Thus, the insert part does not extend directly to the holding element, but rather forms the first channel section of the through-channel between the insert part and the holding part a free end region. It has been shown that thereby the flow resistance of the valve can be kept low.
Günstig ist es, wenn das Halteelement selbst im Stößelkanal festgelegt ist. Das Halteelement kann beispielsweise in einem Endbereich des Stößelkanals angeordnet sein, der sich bis zum Durchgangskanal des Ventilgehäuses erstreckt. It is favorable if the holding element itself is fixed in the ram channel. The holding element can be arranged, for example, in an end region of the tappet channel, which extends as far as the passageway of the valve housing.
Von Vorteil ist es, wenn das Halteelement scheibenförmig ausgestaltet ist. Dies erlaubt es, die Baugröße des Halteelements und damit auch den zur Montage des Halteelements erforderlichen Einbauraum des Ventilgehäuses gering zu halten. It is advantageous if the holding element is configured disk-shaped. This makes it possible to keep the size of the retaining element and thus also the installation space of the valve housing required for mounting the retaining element low.
Um die Montage des Halteelements zu erleichtern, ist das Halteelement bei einer vorteilhaften Ausführungsform der Erfindung in das Ventilgehäuse einpressbar. Insbesondere kann vorgesehen sein, dass das Halteelement in den Stößelkanal einpressbar ist. In order to facilitate the mounting of the holding element, the holding element can be pressed into the valve housing in an advantageous embodiment of the invention. In particular, it can be provided that the retaining element can be pressed into the plunger channel.
Besonders günstig ist es, wenn das Halteelement ein Stanzteil oder ein Drehteil ausbildet. Dies erlaubt es, das Halteelement mit verhältnismäßig geringen Kosten in großer Stückzahl herzustellen. It is particularly favorable when the holding element forms a stamped part or a rotating part. This makes it possible to produce the holding element in comparatively low cost in large quantities.
Es kann vorgesehen sein, dass das Halteelement aus einem Flachmaterial, insbesondere aus einem Blechmaterial besteht. Bei einer bevorzugten Ausgestaltung der Erfindung bildet das Halteelement einen Haltering aus, der den Ventilstößel umgibt. Der Innendurchmesser des Halterings kann größer gewählt sein als der Außendurchmesser des Ventilstößels, so dass die Bewegung des Ventilstößels durch den Haltering nicht beeinträchtigt wird . It can be provided that the holding element consists of a flat material, in particular of a sheet metal material. In a preferred embodiment of the invention, the holding element forms a retaining ring which surrounds the valve tappet. The inner diameter of the retaining ring may be selected to be larger than the outer diameter of the valve stem, so that the movement of the valve stem is not affected by the retaining ring.
Bevorzugt weist der Haltering über seinen Umfang verteilt mehrere radiale Erweiterungen auf. Die radialen Erweiterungen erlauben es auf kostengünstige Weise, den Haltering mit verhältnismäßig geringen Kräften in den Stößelkanal einzupressen, wobei an den Durchmesser des Stößelkanals nur geringe Toleranzanforderungen gestellt werden müssen. Die radialen Erweiterungen können sich beim Einpressen des Halterings so weit verformen, dass dieser zuverlässig axial unverschieblich im Stößelkanal gehalten ist. Preferably, the retaining ring distributed over its circumference on a plurality of radial extensions. The radial extensions allow cost-effective manner to press the retaining ring with relatively small forces in the plunger channel, with only small tolerance requirements must be placed on the diameter of the plunger channel. The radial extensions can deform so far during the pressing of the retaining ring, that this is reliably held axially immovable in the plunger channel.
Alternativ kann vorgesehen sein, dass der Haltering eine Umrisslinie in Form eines Polygons mit abgerundeten Ecken aufweist. Auch eine derartige Ausgestaltung erlaubt es, den Haltering mit verhältnismäßig geringen Kräften in den Stößelkanal einzupressen, wobei an den Durchmesser des Stößelkanals nur geringe Toleranzanforderungen gestellt werden müssen. Beim Einpressen in den Stößelkanal können die abgerundeten Eckbereiche des Polygons an der Wand des Stößelkanals anliegen und sich so weit verformen, dass der Haltering zuverlässig axial unverschieblich im Stößelkanal gehalten ist. Alternatively it can be provided that the retaining ring has an outline in the form of a polygon with rounded corners. Such a configuration also makes it possible to press the retaining ring with relatively small forces in the plunger channel, with only small tolerance requirements must be placed on the diameter of the plunger channel. When pressed into the plunger channel, the rounded corner regions of the polygon rest on the wall of the plunger channel and deform so far that the retaining ring is reliably held axially immovable in the plunger channel.
Die Umrisslinie des Halterings kann beispielsweise ein Quadrat mit abgerundeten Ecken ausbilden. The outline of the retaining ring can form, for example, a square with rounded corners.
Um die mechanische Belastbarkeit des Halteelements zu erhöhen, ist es von Vorteil, wenn das Halteelement an einer Querschnittsverengung des Stößelkanals anliegt. Mit Hilfe der Querschnittsverengung kann das Halteelement bezogen auf die Längsachse des Stößelkanals in axialer Richtung abgestützt werden. Wie eingangs erwähnt, kann mit Hilfe des Abstreifrings die Gefahr einer Beschädigung des den Ventilstößel in Umfangsrichtung umgebenden Dichtrings sowie auch die Gefahr einer Beeinträchtigung der Dichtwirkung des Dichtrings gering gehalten werden. Von Vorteil ist es, wenn der der Dichtring zwischen dem Abstreifring und einem den Ventilstößel umgebenden Stützring angeordnet ist, der am Ventilstößel anliegt, wobei der Abstreifring an der dem Durchgangskanal des Ventilgehäuses zugewandten Seite des Dichtrings und der Stützring an der dem Durchgangskanal abgewandten Seite des Dichtrings angeordnet ist. Der Stützring vermeidet eine Spaltextrusion des Dichtrings, d .h. er stellt sicher, dass der Dichtring unter der Wirkung sehr hoher Flüssigkeitsdrücke nicht auf der dem Durchgangskanal abgewandten Seite in den schmalen Spalt zwischen dem Ventilstößel und dem Stößelkanal gequetscht wird . In order to increase the mechanical strength of the retaining element, it is advantageous if the retaining element bears against a cross-sectional constriction of the plunger channel. With the help of the cross-sectional constriction, the holding element can be supported in the axial direction with respect to the longitudinal axis of the tappet channel. As mentioned above, with the help of the scraper ring, the risk of damage to the valve stem surrounding the circumferential sealing ring and the risk of impairment of the sealing effect of the sealing ring can be kept low. It is advantageous if the sealing ring between the scraper ring and a surrounding the valve stem support ring is arranged, which rests on the valve stem, wherein the scraper ring on the passage of the valve housing side facing the sealing ring and the support ring on the side facing away from the passage channel of the sealing ring is arranged. The support ring avoids a gap extrusion of the sealing ring, i. E. it ensures that under the action of very high liquid pressures, the sealing ring is not squeezed into the narrow gap between the valve tappet and the tappet channel on the side facing away from the passage channel.
Von besonderem Vorteil ist es, wenn der Abstreifring und der Stützring unmittelbar am Dichtring anliegen . It is particularly advantageous if the scraper ring and the support ring abut directly on the sealing ring.
Günstig ist es, wenn der Stützring an einer nach innen gerichteten Stufe des Stößelkanals anliegt. Mittels der nach innen gerichteten Stufe kann der Stützring bezogen auf die Längsachse des Stößelkanals in axialer Richtung abgestützt werden. It is advantageous if the support ring bears against an inwardly directed step of the tappet channel. By means of the inwardly directed step, the support ring can be supported in the axial direction with respect to the longitudinal axis of the plunger channel.
Das Halteelement schließt sich bei einer vorteilhaften Ausführungsform der Erfindung in Richtung des Durchgangskanals an den Abstreifring an. The holding element joins in an advantageous embodiment of the invention in the direction of the through-channel to the scraper ring.
Wie bereits erwähnt, bildet der erste Kanalabschnitt bei einer bevorzugten Ausführungsform der erfindungsgemäßen Ventilpistole zwischen einem Ein- satzteil und dem Halteelement einen freien Endbereich aus. Günstig ist es, wenn der Durchmesser des Endbereichs größer ist als der Durchmesser einer Durchgangsbohrung des Einsatzteils. Strömungsverluste der Reinigungsflüssigkeit können dadurch besonders gering gehalten werden. Die Durchgangsbohrung des Einsatzteils kann den Bereich mit geringstem Durchmesser zwischen dem Einlass und dem Auslass des Ventilgehäuses ausbilden. Dieser Bereich kann in Strömungsrichtung der Reinigungsflüssigkeit sehr kurz ausge- staltet sein, so dass die Reinigungsflüssigkeit beim Durchströmen dieses Bereichs nur geringe Strömungsverluste erleidet. As already mentioned, in a preferred embodiment of the valve gun according to the invention, the first channel section forms a free end region between an insert part and the retaining element. It is advantageous if the diameter of the end region is greater than the diameter of a through hole of the insert part. Flow losses of the cleaning liquid can be kept particularly low. The through hole of the insert member may form the smallest diameter portion between the inlet and the outlet of the valve housing. This area can be very short in the flow direction of the cleaning fluid. be designed so that the cleaning liquid suffers only low flow losses when flowing through this area.
Günstig ist es, wenn sich die Durchgangsbohrung in Richtung auf den Endbereich des ersten Kanalabschnitts kontinuierlich erweitert. Abrupte Durchmesseränderungen können dadurch im Bereich zwischen der Durchgangsbohrung des Einsatzteils und dem Endabschnitt vermieden werden. Der Endbereich der Durchgangsbohrung kann beispielsweise konisch ausgestaltet sein. It is advantageous if the through-hole widens continuously in the direction of the end region of the first channel section. Abrupt changes in diameter can be avoided in the area between the through hole of the insert and the end portion. The end portion of the through hole may be configured conical, for example.
Die nachfolgende Beschreibung vorteilhafter Ausführungsformen der Erfindung dient im Zusammenhang mit der Zeichnung der näheren Erläuterung . Es zeigen : The following description of advantageous embodiments of the invention is used in conjunction with the drawings for further explanation. Show it :
Figur 1 : eine schematische Schnittansicht einer Ventilpistole; Figure 1: a schematic sectional view of a valve gun;
Figur 2 : eine vergrößerte Darstellung eines Ventils der Ventilpistole aus Figur 1; Figure 2 is an enlarged view of a valve of the valve gun of Figure 1;
Figur 3 : eine Draufsicht auf eine erste Ausführungsform eines Halteelements der Ventilpistole aus Figur 1; FIG. 3 shows a plan view of a first embodiment of a retaining element of the valve gun of FIG. 1;
Figur 4: eine Draufsicht auf eine zweite Ausführungsform eines Halteelements der Ventilpistole aus Figur 1. FIG. 4 shows a plan view of a second embodiment of a holding element of the valve gun of FIG. 1.
In Figur 1 ist eine vorteilhafte Ausführungsform einer erfindungsgemäßen Ventilpistole schematisch dargestellt und insgesamt mit dem Bezugszeichen 10 belegt. Die Ventilpistole 10 umfasst ein Pistolengehäuse 12, das in üblicher Weise von einer ersten Gehäuseschale 14 und einer in der Zeichnung nicht dargestellten zweiten Gehäuseschale gebildet wird . Das Pistolengehäuse 12 weist einen zentralen Gehäusebereich 16 auf, der zwischen einem vorderen Gehäusebereich 18 und einem rückwärtigen Gehäusebereich 20 angeordnet ist. Der vordere Gehäusebereich 18 nimmt ein Ventil 22 auf mit einem Ventilgehäuse 24. Das Ventilgehäuse 24 weist einen Einlass 26 und einen Auslass 28 auf, die über einen Durchgangskanal 30 miteinander in Strömungsverbindung stehen. Der Auslass 28 ragt bei der dargestellten Ausführungsform aus einer Vorderseite 32 des Pistolengehäuses 12 hervor. An den Auslass 28 kann beispielsweise eine Sprühlanze angeschlossen werden. Der Einlass 26 ragt bei der dargestellten Ausführungsform aus einer Unterseite 34 des Pistolengehäuses 12 hervor. An den Einlass 26 ist bei der dargestellten Ausführungsform ein Druckschlauch 36 angeschlossen. Der Druckschlauch 36 weist hierzu einen Schlauchnippel 38 auf, der von einem Dichtring umgeben in den Einlass 26 des Ventilgehäuses 24 eingeführt und mittels einer Überwurfmutter 40 am Ventilgehäuse 24 festgelegt werden kann. Die Überwurfmutter 40 ist in der dargestellten Ausführungsform von einem Knickschutz 42 umgeben. 1 shows an advantageous embodiment of a valve gun according to the invention is shown schematically and overall occupied by the reference numeral 10. The valve gun 10 includes a gun housing 12 which is formed in a conventional manner by a first housing shell 14 and a second housing shell, not shown in the drawing. The gun housing 12 has a central housing portion 16 which is disposed between a front housing portion 18 and a rear housing portion 20. The front housing portion 18 receives a valve 22 with a valve housing 24. The valve housing 24 has an inlet 26 and an outlet 28, which communicate with each other via a through-channel 30 in fluid communication. The outlet 28 protrudes from a front side 32 of the pistol housing 12 in the illustrated embodiment. For example, a spray lance can be connected to the outlet 28. The inlet 26 protrudes in the illustrated embodiment from a bottom 34 of the gun housing 12. At the inlet 26, a pressure hose 36 is connected in the illustrated embodiment. For this purpose, the pressure hose 36 has a hose nipple 38, which can be inserted into the inlet 26 of the valve housing 24 surrounded by a sealing ring and fixed to the valve housing 24 by means of a union nut 40. The union nut 40 is surrounded by a kink protection 42 in the illustrated embodiment.
Vom rückwärtigen Gehäusebereich 20 des Pistolengehäuses 12 steht ein Griff 44 ab, von dessen freiem Endbereich 46 sich bei der dargestellten Ausführungsform ein Schutzbügel 48 bis zum vorderen Gehäusebereich 18 erstreckt. Der Schutzbügel 48, der zentrale Gehäusebereich 16 und der Griff 44 umgeben eine Eingreiföffnung 50, in die der Benutzer mit seinen Fingern eingreifen kann. From the rear housing portion 20 of the gun housing 12 is a handle 44, from the free end portion 46 extends in the illustrated embodiment, a protective bracket 48 to the front housing portion 18. The guard 48, the central housing portion 16 and the handle 44 surround an engagement opening 50 into which the user can engage with his fingers.
Das Ventil 22 ist in Figur 2 vergrößert dargestellt. Wie aus Figur 2 ersichtlich, weist der Durchgangskanal 30 einen geradlinigen ersten Kanalabschnitt 52 auf, der sich in Strömungsrichtung 54 der Reinigungsflüssigkeit an den Einlass 26 anschließt und in Strömungsrichtung 54 im Abstand zum Einlass 26 eine erste radial nach innen gerichtete Stufe 56 und in Strömungsrichtung 54 im Abstand zur ersten Stufe 56 eine zweite radial nach innen gerichtete Stufe 58 aufweist. Stromabwärts der zweiten Stufe 58 bildet der erste Kanalabschnitt 52 einen freien Endbereich 60 aus. An den freien Endbereich 60 schließt sich ein zweiter Kanalabschnitt 62 an, der in einem Winkel zum ersten Kanalabschnitt 52 ausgerichtet ist, das heißt die Längsachse 64 des zweiten Kanalabschnitts 62 ist in einem Winkel zur Längsachse 66 des ersten Kanalabschnitts 52 ausgerichtet. Bei der dargestellten Ausführungsform ist der Winkel zwischen der Längsachse 64 und der Längsachse 66 größer als 90°, der Winkel beträgt beispielsweise 115°. The valve 22 is shown enlarged in FIG. As can be seen from FIG. 2, the through-channel 30 has a rectilinear first channel section 52 which adjoins the inlet 26 in the direction of flow 54 of the cleaning fluid and a first radially inwardly directed step 56 and in the flow direction 54 in the flow direction 54 at a distance from the inlet 26 at a distance from the first stage 56 has a second radially inwardly directed step 58. Downstream of the second stage 58, the first channel section 52 forms a free end region 60. Adjoining the free end portion 60 is a second channel portion 62 which is oriented at an angle to the first channel portion 52, that is, the longitudinal axis 64 of the second channel portion 62 is oriented at an angle to the longitudinal axis 66 of the first channel portion 52. In the illustrated embodiment, the angle between the longitudinal axis 64 and the longitudinal axis 66 is greater than 90 °, the angle is for example 115 °.
An den zweiten Kanalabschnitt 62 schließt sich bei der dargestellten Ausführungsform ein dritter Kanalabschnitt 68 des Durchgangskanals 30 an . Der dritte Kanalabschnitt 68 erstreckt sich bis zum Auslass 28 des Ventilgehäuses 24. Die Längsachse 70 des dritten Kanalabschnitts 68 ist im Winkel zur Längsachse 64 des zweiten Kanalabschnitts 62 ausgerichtet. In der dargestellten Ausführungsform verläuft die Längsachse 70 des dritten Kanalabschnitts 68 senkrecht zur Längsachse 66 des ersten Kanalabschnitts 52. In the illustrated embodiment, a third channel section 68 of the through-channel 30 adjoins the second channel section 62. The third channel section 68 extends to the outlet 28 of the valve housing 24. The longitudinal axis 70 of the third channel section 68 is aligned at an angle to the longitudinal axis 64 of the second channel section 62. In the illustrated embodiment, the longitudinal axis 70 of the third channel section 68 is perpendicular to the longitudinal axis 66 of the first channel section 52.
Zusätzlich zum Durchgangskanal 30 weist das Ventilgehäuse 24 einen stufigen Stößelkanal 72 auf, der fluchtend zum ersten Kanalabschnitt 52 angeordnet ist und sich an den freien Endbereich 60 des ersten Kanalabschnitts 52 anschließt. Der Stößelkanal 72 erstreckt sich bis zu einer dem Einlass 26 abgewandten Oberseite 74 des Ventilgehäuses 24. In addition to the passage 30, the valve housing 24 has a stepped plunger channel 72, which is arranged in alignment with the first channel section 52 and adjoins the free end region 60 of the first channel section 52. The plunger channel 72 extends up to a side facing away from the inlet 26 top 74 of the valve housing 24th
Im ersten Kanalabschnitt 52 ist ein Einsatzteil 76 angeordnet, das zylindrisch ausgestaltet ist und mit einer dem Einlass 26 abgewandten Stirnseite 78 an der zweiten Stufe 58 anliegt. Das Einsatzteil 76 weist eine geradlinige Durchgangsbohrung 80 auf, die sich von einem dem Einlass 26 zugewandten Ventilsitz 82 des Einsatzteils 76 bis zur Stirnseite 78 erstreckt, wobei ein der Stirnseite 78 unmittelbar benachbarter Endbereich der Durchgangsbohrung 80 eine konische Erweiterung 84 ausbildet. Der Durchmesser der Durchgangsbohrung 80 stromaufwärts der Erweiterung 84 ist geringer gewählt als der Durchmesser des freien Endbereichs 60 des ersten Kanalabschnitts 52. In the first channel portion 52, an insert 76 is arranged, which is cylindrical and with a side facing away from the inlet 26 end face 78 rests against the second step 58. The insert 76 has a rectilinear through-bore 80 which extends from a valve seat 82 facing the inlet 26 of the insert 76 to the end 78, wherein an end face 78 of the immediately adjacent end portion of the through-hole 80 forms a conical widening 84. The diameter of the through-hole 80 upstream of the extension 84 is set smaller than the diameter of the free end portion 60 of the first channel portion 52.
Stromaufwärts des Einsatzteils 76 ist im ersten Kanalabschnitt 52 ein Schließkörper 86 angeordnet, der bei der dargestellten Ausführungsform kugelförmig ausgestaltet ist. In der in den Figuren 1 und 2 dargestellten Schließstellung liegt der Schließkörper 86 am Ventilsitz 82 an. Mittels einer Schließfeder 88 wird der Schließkörper 86 mit einer Schließkraft beaufschlagt, so dass er gegen den Ventilsitz 82 gedrückt wird. Die Schließfeder 88 stützt sich mit ihrem dem Schließkörper 86 zugewandten Ende an einem ersten Federhalter 90 ab, der am Schließkörper 86 anliegt, und mit ihrem dem Schließkörper 86 abgewandten Ende stützt sich die Schließfeder 88 an einem zweiten Federhalter 92 ab, der in den ersten Kanalabschnitt 52 eingefügt ist und mit einem radial nach außen gerichteten Flansch 94 an der ersten Stufe 56 des ersten Kanalabschnitts 52 anliegt. Upstream of the insert part 76, a closing body 86 is arranged in the first channel section 52, which is configured spherical in the illustrated embodiment. In the closed position shown in Figures 1 and 2, the closing body 86 abuts the valve seat 82. By means of a closing spring 88, the closing body 86 is acted upon by a closing force, so that it is pressed against the valve seat 82. The closing spring 88 is supported by her the closing body 86 facing the end of a first spring holder 90, which bears against the closing body 86, and with its end facing away from the closing body 86, the closing spring 88 is supported on a second spring holder 92 which is inserted into the first channel portion 52 and with a radial outwardly directed flange 94 abuts the first step 56 of the first channel section 52.
Der Stößelkanal 72 weist einen von der Oberseite 74 des Ventilgehäuses 24 ausgehenden Eingangsabschnitt 96 auf, der über eine nach außen gerichtete erste stufige Erweiterung 98 in einen mittleren Kanalabschnitt 100 übergeht, an den sich über eine zweite stufige Erweiterung 102 ein Ausgangsabschnitt 104 anschließt, der in den freien Endbereich 60 des ersten Kanalabschnitts 52 einmündet. The ram channel 72 has an outgoing from the top 74 of the valve housing 24 input section 96, which merges via an outwardly directed first stepped extension 98 into a central channel section 100, to which a second stepped extension 102, an output section 104 connects, in the free end portion 60 of the first channel portion 52 opens.
Der Stößelkanal 72 wird von einem Ventilstößel 106 durchgriffen, der sich bis zum Schließkörper 86 erstreckt und mit seinem freien Ende 108 aus der Oberseite 74 des Ventilgehäuses 24 herausragt. The plunger channel 72 is penetrated by a valve stem 106, which extends to the closing body 86 and protrudes with its free end 108 from the top 74 of the valve housing 24.
Im Bereich des mittleren Kanalabschnitts 100 ist der Ventilstößel 106 von einem Stützring 110 und einem Abstreifring 112 umgeben. Zwischen dem Stützring 110 und dem Abstreifring 112 ist ein Dichtring 114 angeordnet, der den Ventilstößel 106 umgibt. Der Dichtring 114 liegt sowohl am Außenumfang des Ventilstößels 106 als auch an der Wand des mittleren Kanalabschnitts 100 dicht an und stellt dadurch sicher, dass Reinigungsflüssigkeit nicht über den Stößelkanal 72 aus dem Durchgangskanal 30 herausströmen kann. In the region of the central channel section 100, the valve tappet 106 is surrounded by a support ring 110 and a wiper ring 112. Between the support ring 110 and the scraper ring 112, a sealing ring 114 is arranged, which surrounds the valve tappet 106. The sealing ring 114 bears tightly against the outer circumference of the valve tappet 106 as well as against the wall of the central channel section 100, thereby ensuring that cleaning fluid can not flow out of the through-channel 30 via the tappet channel 72.
Der Stützring 110 liegt mit seiner dem Dichtring 114 abgewandten Oberseite an der ersten stufigen Erweiterung 98 des Stößelkanals 72 an und vermeidet eine Spaltextrusion des Dichtrings 114, d.h. er stellt sicher, dass der Dichtring 114 unter der Wirkung sehr hoher Flüssigkeitsdrücke nicht in den Spalt zwischen dem Ventilstößel 106 und der Wand des Eingangsabschnitts 96 des Stößelkanals 72 gequetscht wird . Der Abstreifring 112 liegt mit seinem Innenrand am Ventilstößel 106 an, so dass der Ventilstößel 106 bei einer Bewegung relativ zum Abstreifring 112 vom Abstreifring 112 abgestreift wird. The support ring 110 lies with its upper side facing away from the sealing ring 114 on the first stepped extension 98 of the plunger channel 72 and avoids a gap extrusion of the sealing ring 114, ie it ensures that the sealing ring 114 under the action of very high liquid pressures not in the gap between the Valve tappet 106 and the wall of the input portion 96 of the plunger channel 72 is squeezed. The wiper ring 112 bears with its inner edge on the valve tappet 106, so that the valve tappet 106 is stripped off during a movement relative to the wiper ring 112 from the wiper ring 112.
Zur Festlegung des Stützrings 110, des Abstreifrings 112 und des Dichtrings 114 im mittleren Kanalabschnitt 100 des Stößelkanals 72 weist das Ventil 22 ein Halteelement 116 auf. To fix the support ring 110, the scraper ring 112 and the sealing ring 114 in the middle channel portion 100 of the plunger channel 72, the valve 22 has a holding element 116.
Eine erste vorteilhafte Ausführungsform des Halteelements 116 ist in Figur 3 in Form eines Halterings 117 vergrößert dargestellt. Der Haltering 117 ist als Stanzteil aus einem Blechmaterial gefertigt und weist radiale Erweiterungen 120 mit einer bogenförmigen Außenkontur auf, die über seinen Außenumfang 118 gleichmäßig verteilt angeordnet sind . A first advantageous embodiment of the retaining element 116 is shown enlarged in FIG. 3 in the form of a retaining ring 117. The retaining ring 117 is made as a stamped part of a sheet material and has radial extensions 120 with an arcuate outer contour, which are arranged distributed uniformly over its outer periphery 118.
Eine zweite vorteilhafte Ausführungsform des Halteelements 116 ist in Figur 4 in Form eines Halterings 119 vergrößert dargestellt. Der Haltering 119 ist als Drehteil aus einem Vierkantmaterial gefertigt und weist eine Umrisslinie in Form eines Polygons mit abgerundeten Ecken 121 auf. A second advantageous embodiment of the retaining element 116 is shown enlarged in FIG. 4 in the form of a retaining ring 119. The retaining ring 119 is made as a turned part of a square material and has an outline in the form of a polygon with rounded corners 121.
Das Halteelement 116 ist in den Ausgangsabschnitt 104 des Stößelkanals 72 eingepresst und liegt an der zweiten stufigen Erweiterung 102 des Stößelkanals 72 an. Mit Hilfe des Halteelements 116 sind der Stützring 110, der Abstreifring 112 und der Dichtring 114 im mittleren Kanalabschnitt 100 des Stößelkanals 72 gehalten. The holding element 116 is pressed into the output section 104 of the plunger channel 72 and abuts against the second stepped extension 102 of the plunger channel 72. With the aid of the retaining element 116, the support ring 110, the scraper ring 112 and the sealing ring 114 are held in the middle channel section 100 of the plunger channel 72.
Der Ventilstößel 106 kann durch Verschwenken eines Auslösehebels 122 in Richtung des Einlasses 26 verschoben werden, so dass der Schließkörper 86 entgegen der Schließkraft der Schließfeder 88 vom Ventilsitz 82 abhebt und dadurch die Strömungsverbindung zwischen dem Einlass 26 und dem Auslass 28 freigibt. Der Auslösehebel 122 ist im Griff 44 angeordnet und um eine Schwenkachse 124 verschwenkbar an der ersten Gehäuseschale 14 und der zweiten Gehäuseschale gelagert. Er kann vom Benutzer mit dem Handballen aus seiner in Figur 1 dargestellten Ruhestellung in Richtung des vorderen Ge- häusebereichs 18 verschwenkt werden. Die Schwenkachse 124 des Auslösehebels 122 ist im freien Endbereich 46 des Griffs 44 angeordnet. In seiner Ruhestellung ragt der Auslösehebel 122 mit einer Betätigungsfläche 128 aus der dem vorderen Gehäusebereich 18 abgewandten Rückseite des Griffs 44 heraus. The valve stem 106 can be displaced by pivoting a release lever 122 in the direction of the inlet 26, so that the closing body 86 lifts against the closing force of the closing spring 88 from the valve seat 82 and thereby releases the flow connection between the inlet 26 and the outlet 28. The release lever 122 is arranged in the handle 44 and mounted pivotably about a pivot axis 124 on the first housing shell 14 and the second housing shell. It can be moved by the user with the heel of his hand from his rest position shown in FIG. 1 in the direction of the front. housing area 18 are pivoted. The pivot axis 124 of the release lever 122 is disposed in the free end region 46 of the handle 44. In its rest position, the release lever 122 protrudes with an actuating surface 128 out of the front housing region 18 facing away from the back of the handle 44.
Der Auslösehebel 122 wird von einer ersten Rückstellfeder 130 mit einer federelastischen Rückstellkraft beaufschlagt. Unter der Wirkung der ersten Rückstellfeder 130 nimmt der Auslösehebel 122 selbsttätig seine Ruhestellung ein, wenn der Benutzer den Auslösehebel 122 freigibt. The trigger lever 122 is acted upon by a first return spring 130 with a resilient restoring force. Under the action of the first return spring 130, the release lever 122 automatically assumes its rest position when the user releases the release lever 122.
In seiner Ruhestellung wird der Auslösehebel 122 mit Hilfe eines ersten Arretierungsglieds 132 selbsttätig arretiert. Hierzu ist das im Wesentlichen L-för- mig ausgestaltete erste Arretierungsglied 132 im Griff 44 schwenkbar gelagert. Ein erster Schenkel 134 des ersten Arretierungsglieds 132 ragt in der Ruhestellung des Auslösehebels 122 aus der dem vorderen Gehäusebereich 18 zugewandten Vorderseite des Griffs 44 heraus. Ein dem Auslösehebel 122 zugewandter zweiter Schenkel 136 des ersten Arretierungsglieds 132 liegt in der Ruhestellung des Auslösehebels 122 mit seinem freien Ende 140 am Auslösehebel 122 an und hindert diesen an einer Schwenkbewegung . Mittels einer zweiten Rückstellfeder 142 wird das erste Arretierungsglied 132 in seine in Figur 1 dargestellte Arretierungsstellung gedrückt. Umgreift der Benutzer mit seiner Hand den Griff 44, so verschwenkt er mit seinen Fingern intuitiv das erste Arretierungsglied 132 entgegen der Federkraft der zweiten Rückstellfeder 142 in eine Stellung, in der der zweite Schenkel 136 in eine Ausnehmung 144 des Auslösehebels 122 eintauchen kann und dadurch der Auslösehebel 122 vom ersten Arretierungsglied 132 ungehindert um die Schwenkachse 124 schwenkt. Gibt der Benutzer den Griff 44 wieder frei, so wird der Auslösehebel 122 von der ersten Rückstellfeder 130 selbsttätig in seine Ruhestellung verschwenkt und das erste Arretierungsglied 132 wird von der zweiten Rückstellfeder 142 in die Arretierungsstellung verschwenkt, in der es den Auslösehebel 122 arretiert. Eine Schwenkbewegung des Auslösehebels 122 in Richtung des vorderen Gehäusebereichs 18 wird über einen im zentralen Gehäusebereich 16 angeordneten Kopplungshebel 146 auf den Ventilstößel 106 übertragen. Der Kopplungshebel 146 ist am Ventilgehäuse 24 um eine Kopplungsachse 148 verschwenkbar gelagert. Die Kopplungsachse 148 ist parallel zur Schwenkachse 124 ausgerichtet. In geringem Abstand zur Kopplungsachse 148 weist der Kopplungshebel 146 ein justierbares Kraftbeaufschlagungselement 150 auf, das am freien Ende des Ventilstößels 106 anliegt. An seinem dem Auslösehebel 122 zugewandten hinteren Ende 152 weist der Kopplungshebel 146 im Abstand zueinander eine erste Kopplungsrolle 154 und eine zweite Kopplungsrolle 156 auf, die beim Verschwenken des Auslösehebels 122 in Richtung des vorderen Gehäusebereichs 18 nacheinander jeweils an einem Abschnitt einer Führungsbahn 158 entlanggleiten, die von einer dem Kopplungshebel 146 zugewandten Stirnseite 160 des Auslösehebels 122 gebildet wird . Wird der Auslösehebel 122 in Richtung des vorderen Gehäusebereichs 18 verschwenkt, so gleitet zunächst die erste Kopplungsrolle 154 an einem hinteren Endbereich der Führungsbahn 158 entlang und der Kopplungshebel 146 wird derart verschwenkt, dass das Kraftbeaufschlagungselement 150 den Ventilstößel 106 in Richtung des Einlasses 26 des Ventilgehäuses 24 verschiebt. Beim weiteren Verschwenken des Auslösehebels 122 in Richtung des vorderen Gehäusebereichs 18 hebt die erste Kopplungsrolle 154 von der Führungsbahn 158 ab und die zweite Kopplungsrolle 156 bewegt sich an einem vorderen Abschnitt der Führungsbahn 158 entlang, so dass der Kopplungshebel 146 weiter verschwenkt wird und dadurch der Ventilstößel 106 weiter verschoben wird, bis der Schließkörper 86 seine Offenstellung erreicht. In its rest position, the release lever 122 is automatically locked by means of a first locking member 132. For this purpose, the substantially L-shaped first locking member 132 is pivotally mounted in the handle 44. A first leg 134 of the first locking member 132 protrudes in the rest position of the trigger lever 122 out of the front housing portion 18 facing front of the handle 44 out. A the trigger lever 122 facing the second leg 136 of the first locking member 132 is in the rest position of the trigger lever 122 with its free end 140 on the trigger lever 122 and prevents it from pivoting movement. By means of a second return spring 142, the first locking member 132 is pressed into its locking position shown in Figure 1. When the user grasps the handle 44 with his hand, he intuitively pivots the first locking member 132 counter to the spring force of the second return spring 142 into a position in which the second leg 136 can dip into a recess 144 of the release lever 122 and thereby the finger Release lever 122 from the first locking member 132 freely pivots about the pivot axis 124. If the user releases the handle 44 again, the trigger lever 122 is automatically pivoted by the first return spring 130 into its rest position and the first locking member 132 is pivoted by the second return spring 142 in the locking position in which it locks the release lever 122. A pivoting movement of the trigger lever 122 in the direction of the front housing portion 18 is transmitted to the valve tappet 106 via a coupling lever 146 arranged in the central housing region 16. The coupling lever 146 is pivotably mounted on the valve housing 24 about a coupling axis 148. The coupling axis 148 is aligned parallel to the pivot axis 124. At a small distance from the coupling axis 148, the coupling lever 146 has an adjustable force-applying element 150, which rests against the free end of the valve tappet 106. At its rear end 152, which faces the release lever 122, the coupling lever 146 has a first coupling roller 154 and a second coupling roller 156, which, when the release lever 122 pivots in the direction of the front housing section 18, successively slide along a section of a guide track 158 is formed by a the coupling lever 146 facing end face 160 of the trigger lever 122. When the trigger lever 122 is pivoted in the direction of the front housing portion 18, first the first coupling roller 154 slides along a rear end region of the guide track 158 and the coupling lever 146 is pivoted such that the force application element 150 moves the valve lifter 106 in the direction of the inlet 26 of the valve housing 24 shifts. Upon further pivoting of the trigger lever 122 in the direction of the front housing portion 18, the first coupling roller 154 lifts from the guide track 158 and the second coupling roller 156 moves along a front portion of the guide track 158, so that the coupling lever 146 is further pivoted and thereby the valve lifter 106 is further shifted until the closing body 86 reaches its open position.
Gibt der Benutzer den Auslösehebel 122 wieder frei, so wird der Auslösehebel 122, wie bereits erwähnt, von der ersten Rückstellfeder 130 in seine Ruhestellung zurück verschwenkt und gleichzeitig wird der Kopplungshebel 146 vom Ventilstößel 106 in seine Ausgangsstellung zurück geschwenkt, da der Ventilstößel 106 über den Schließkörper 86 von der Schließfeder 88 mit einer Rückstellkraft beaufschlagt wird. Der Schließkörper 86 nimmt hierbei seine Schließstellung ein, in der er wieder am Ventilsitz 82 anliegt. Soll die Ventilpistole 10 außer Betrieb genommen werden, dann kann der Benutzer den Kopplungshebel 146 und über diesen auch den Auslösehebel 122 mittels eines zweiten Arretierungsglieds 162 arretieren. Das zweite Arretierungsglied 162 ist als Schiebekörper 164 ausgestaltet, der oberhalb des Kopplungshebels 146 am Pistolengehäuse 12 zwischen einer in Figur 1 dargestellten Sperrstellung und einer in der Zeichnung nicht dargestellten Parkstellung hin und her verschoben werden kann. Der Schiebekörper 164 weist einen Arretierungsnocken 166 auf, der in der Sperrstellung an der dem Auslösehebel 122 abgewandten Oberseite des Kopplungshebels 146 unmittelbar anliegt oder in geringem Abstand zur Oberseite des Kopplungshebels 146 angeordnet ist und den Kopplungshebel 146 an einer Schwenkbewegung hindert. Aus der Sperrstellung kann der Schiebekörper 164 in die dem vorderen Gehäusebereich 18 abgewandte Richtung nach hinten verschoben werden, in der der Arretierungsnocken 166 den Kopplungshebel 146 freigibt. Mittels an sich bekannter Rastelemente kann der Schiebekörper 164 in der Sperrstellung und in der Parkstellung mit dem Pistolengehäuse 12 verrastet werden. If the user releases the release lever 122 again, the release lever 122 is, as already mentioned, pivoted back by the first return spring 130 in its rest position and simultaneously the coupling lever 146 is pivoted back from the valve stem 106 to its original position, since the valve stem 106 on the Closing member 86 is acted upon by the closing spring 88 with a restoring force. The closing body 86 in this case assumes its closed position, in which it bears against the valve seat 82 again. If the valve gun 10 is to be taken out of service, then the user can lock the coupling lever 146 and via this also the trigger lever 122 by means of a second locking member 162. The second locking member 162 is configured as a sliding body 164, which can be moved back and forth above the coupling lever 146 on the gun housing 12 between a blocking position shown in Figure 1 and a parking position, not shown in the drawing. The sliding body 164 has a locking cam 166, which abuts directly in the blocking position on the upper side of the coupling lever 146 facing away from the trigger lever 122 or is arranged at a small distance to the top of the coupling lever 146 and prevents the coupling lever 146 from pivoting. From the blocking position, the sliding body 164 can be moved backwards in the direction away from the front housing region 18, in which the locking cam 166 releases the coupling lever 146. By means of locking elements known per se, the sliding body 164 can be locked in the blocking position and in the parking position with the gun housing 12.
Beim Öffnen und Schließen des Ventils 22 hat die hin und her gehende Bewegung des Ventilstößels 106 zur Folge, dass Kalkpartikel und sonstige abrasive Partikel, beispielsweise Rostpartikel, die sich am Ventilstößel 106 ablagern, mit Hilfe des Abstreifrings 112 vom Ventilstößel 106 abgestreift werden. Der Ventilstößel 106 weist daher in seinem abgestreiften Bereich auch nach langer Einsatzzeit nur eine geringe Rauigkeit auf. Im abgestreiften Bereich liegt der Dichtring 114 dicht am Ventilstößel 106 an und die Dichtwirkung des Dichtrings 114 wird durch Kalkpartikel und sonstige abrasive Partikel nicht beeinträchtigt. Auch eine Beschädigung des Dichtrings 114 durch Kalkpartikel oder sonstige abrasive Partikel kann durch den Einsatz des im Stößelkanal 72 gehaltenen Abstreifrings 112 vermieden werden. When opening and closing the valve 22, the reciprocating movement of the valve tappet 106 has the consequence that lime particles and other abrasive particles, for example rust particles, which deposit on the valve tappet 106 are stripped off by the valve tappet 106 with the aid of the wiper ring 112. The valve stem 106 therefore has only a small roughness in its stripped area even after a long period of use. In the stripped area of the sealing ring 114 is close to the valve stem 106 and the sealing effect of the sealing ring 114 is not affected by lime particles and other abrasive particles. A damage of the sealing ring 114 by lime particles or other abrasive particles can be avoided by the use of the scraper ring 112 held in the ram channel 72.
Der Durchgangskanal 30 weist einen verhältnismäßig großen Durchmesser auf und bildet daher für die Reinigungsflüssigkeit nur einen geringen Strömungswiderstand . Insbesondere weist der freie Endbereich 60 des ersten Kanal- abschnitts 52 einen beträchtlichen Durchmesser auf. Der Bereich mit geringstem Strömungsquerschnitt wird von der Durchgangsbohrung 80 des Einsatz- teils 76 gebildet. Die Durchgangsbohrung 80 kann allerdings verhältnismäßig kurz ausgestaltet werden, so dass die Reinigungsflüssigkeit auch im Bereich des Einsatzteils 76 nur geringe Strömungsverluste erleidet. The passage 30 has a relatively large diameter and therefore forms only a small flow resistance for the cleaning liquid. In particular, the free end region 60 of the first channel section 52 a considerable diameter. The region with the smallest flow cross-section is formed by the through-bore 80 of the insert part 76. However, the through-bore 80 can be made relatively short, so that the cleaning fluid suffers only small flow losses in the region of the insert 76.

Claims

P A T E N T A N S P R Ü C H E PATENT APPLICATIONS
1. Ventilpistole für ein Hochdruckreinigungsgerät, mit einem Ventil (22), das ein Ventilgehäuse (24) aufweist mit einem sich von einem Einlass (26) zu einem Auslass (28) erstreckenden Durchgangskanal (30), der einen ersten Kanalabschnitt (52) aufweist, in dem ein Ventilsitz (82) und ein in einer Schließstellung unter der Wirkung einer Schließfeder (88) am Ventilsitz (82) anliegender Schließkörper (86) angeordnet sind, wobei der Schließkörper (86) durch Verschieben eines Ventilstößels (106) in eine zum Ventilsitz (82) beabstandete Offenstellung bewegbar ist und der Ventilstößel (106) von einem Dichtring (114) umgeben einen in den ersten Kanalabschnitt (52) einmündenden Stößelkanal (72) durchgreift und außerhalb des Ventilgehäuses (24) mechanisch mit einem um eine A valve gun for a high pressure cleaner comprising a valve (22) having a valve housing (24) with a passageway (30) extending from an inlet (26) to an outlet (28) having a first passageway portion (52) in which a valve seat (82) and a in a closed position under the action of a closing spring (88) on the valve seat (82) abutting the closing body (86) are arranged, wherein the closing body (86) by moving a valve stem (106) in one of Valve seat (82) spaced open position is movable and the valve stem (106) surrounded by a sealing ring (114) engages in the first channel portion (52) opening plunger channel (72) and outside of the valve housing (24) mechanically with a to a
Schwenkachse (124) verschwenkbaren Auslösehebel (122) gekoppelt ist, dadurch gekennzeichnet, dass der Ventilstößel (106) von einem benachbart zum Dichtring (114) angeordneten Abstreifring (112) umgeben ist, der am Ventilstößel (106) anliegt und zusammen mit dem Dichtring (114) von einem im Abstand zum Ventilsitz (82) angeordneten Halteelement (116) im Stößelkanal (72) gehalten ist.  Pivot axis (124) pivotable release lever (122) is coupled, characterized in that the valve stem (106) of a adjacent to the sealing ring (114) arranged scraper ring (112) which bears against the valve stem (106) and together with the sealing ring ( 114) by a spaced from the valve seat (82) arranged holding element (116) in the plunger channel (72) is held.
2. Ventilpistole nach Anspruch 1, dadurch gekennzeichnet, dass im ersten Kanalabschnitt (52) ein Einsatzteil (76) angeordnet ist, das den Ventilsitz (82) ausbildet, wobei das Halteelement (116) im Abstand zum Einsatzteil (76) angeordnet ist. 2. Valve gun according to claim 1, characterized in that in the first channel section (52) an insert part (76) is arranged, which forms the valve seat (82), wherein the holding element (116) at a distance from the insert part (76) is arranged.
3. Ventilpistole nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Halteelement (116) im Stößelkanal (72) festgelegt ist. 3. Valve gun according to claim 1 or 2, characterized in that the holding element (116) in the tappet channel (72) is fixed.
4. Ventilpistole nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass das Halteelement (116) scheibenförmig ausgestaltet ist. 4. Valve gun according to claim 1, 2 or 3, characterized in that the holding element (116) is designed disc-shaped.
5. Ventilpistole nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass das Halteelement (116) in den Stößelkanal (72) einpressbar ist. 5. Valve gun according to one of the preceding claims, characterized in that the holding element (116) in the plunger channel (72) can be pressed.
6. Ventilpistole nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass das Halteelement (116) ein Stanzteil oder ein Drehteil ausbildet. 6. Valve gun according to one of the preceding claims, characterized in that the holding element (116) forms a stamped part or a rotating part.
7. Ventilpistole nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass das Halteelement (116) einen Haltering (117; 119) ausbildet, der den Ventilstößel (106) umgibt. 7. Valve gun according to one of the preceding claims, characterized in that the holding element (116) forms a retaining ring (117, 119) which surrounds the valve tappet (106).
8. Ventilpistole nach Anspruch 7, dadurch gekennzeichnet, dass der Haltering (117) über seinen Umfang verteilt mehrere radiale Erweiterungen (120) aufweist. 8. Valve gun according to claim 7, characterized in that the retaining ring (117) distributed over its circumference has a plurality of radial extensions (120).
9. Ventilpistole nach Anspruch 7, dadurch gekennzeichnet, dass der Haltering (119) eine Umrisslinie in Form eins Polygons mit abgerundeten Ecken (121) aufweist. 9. Valve gun according to claim 7, characterized in that the retaining ring (119) has an outline in the form of a polygon with rounded corners (121).
10. Ventilpistole nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass das Halteelement (116) an einer Querschnittsverengung (102) des Stößelkanals (72) anliegt. 10. Valve gun according to one of the preceding claims, characterized in that the holding element (116) bears against a cross-sectional constriction (102) of the plunger channel (72).
11. Ventilpistole nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass der Dichtring (114) zwischen dem Abstreifring (112) und einem den Ventilstößel (106) umgebenden Stützring (110) angeordnet ist, der am Ventilstößel (106) anliegt, wobei der Abstreifring (112) an der dem Durchgangskanal (30) zugewandten Seite des Dichtrings (114) und der Stützring (110) an der dem Durchgangskanal (30) abgewandten Seite des Dichtrings (114) angeordnet ist. 11. Valve gun according to one of the preceding claims, characterized in that the sealing ring (114) between the scraper ring (112) and a valve plunger (106) surrounding the support ring (110) is arranged, which rests against the valve stem (106), wherein the scraper ring (112) on the said passageway (30) facing side of the sealing ring (114) and the support ring (110) on the said passageway (30) facing away from the sealing ring (114) is arranged.
12. Ventilpistole nach Anspruch 11, dadurch gekennzeichnet, dass der Stützring (110) an einer nach innen gerichteten Stufe (98) des Stößelkanals (72) anliegt. 12. Valve gun according to claim 11, characterized in that the support ring (110) rests against an inwardly directed step (98) of the tappet channel (72).
13. Ventilpistole nach Anspruch 11 oder 12, dadurch gekennzeichnet, dass sich das Halteelement (116) in Richtung des Durchgangskanals (30) an den Abstreifring (112) anschließt. 13. Valve gun according to claim 11 or 12, characterized in that the holding element (116) in the direction of the passage channel (30) to the scraper ring (112) connects.
14. Ventilpistole nach einem der Ansprüche 2 bis 13, dadurch gekennzeichnet, dass der erste Kanalabschnitt (52) zwischen dem Einsatzteil (76) und dem Halteelement (116) einen Endbereich (60) ausbildet, dessen Durchmesser größer ist als der Durchmesser einer Durchgangsbohrung (80) des Einsatzteils (76). 14. Valve gun according to one of claims 2 to 13, characterized in that the first channel portion (52) between the insert part (76) and the holding element (116) forms an end region (60) whose diameter is larger than the diameter of a through-bore ( 80) of the insert (76).
15. Ventilpistole nach Anspruch 14, dadurch gekennzeichnet, dass sich die Durchgangsbohrung (80) in Richtung auf den Endbereich (60) kontinuierlich erweitert. 15. Valve gun according to claim 14, characterized in that the through-bore (80) continuously widens in the direction of the end region (60).
EP16716870.7A 2016-04-15 2016-04-15 Valve pistol for a high-pressure cleaning device Active EP3442722B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2016/058419 WO2017178073A1 (en) 2016-04-15 2016-04-15 Valve pistol for a high-pressure cleaning device

Publications (2)

Publication Number Publication Date
EP3442722A1 true EP3442722A1 (en) 2019-02-20
EP3442722B1 EP3442722B1 (en) 2021-06-09

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Country Status (4)

Country Link
EP (1) EP3442722B1 (en)
CN (1) CN109070106B (en)
DK (1) DK3442722T3 (en)
WO (1) WO2017178073A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108006223A (en) * 2017-11-08 2018-05-08 中国航空工业集团公司金城南京机电液压工程研究中心 A kind of plunger valve cast with sealing compensation
CN113266063B (en) * 2021-04-25 2022-06-14 厦门水乐卫浴有限公司 Body cleaning device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3720241C2 (en) * 1986-09-26 1994-09-22 Wolfgang Suttner Valve gun for a high pressure cleaning device
DE10159680C1 (en) 2001-11-30 2003-05-08 Kaercher Gmbh & Co Alfred Closing device, for liquid delivery line of high pressure cleaning device, comprises piston arranged upstream of valve seat and exiting the delivery line in sealed manner to interact with hand lever to support its opening movement
DE102004037316A1 (en) * 2004-07-31 2006-03-23 Alto Deutschland Gmbh Manual shut-off pistol with pressure-relieved hand lever
ES1064341Y (en) * 2006-11-24 2007-06-01 Grupo Sagola Soc De Promocion PRESS-STAPS FOR AIR GUNS
FR2933961B1 (en) * 2008-07-16 2013-06-21 Valois Sas FLUID PRODUCT APPLICATOR DEVICE.
DE102013108421A1 (en) * 2013-08-05 2015-02-05 Dr. Walter Hunger Beteiligungs GmbH & Co. Besitz KG Wiper unit and hydraulic working device with a wiper unit
WO2015086085A1 (en) * 2013-12-12 2015-06-18 Alfred Kärcher Gmbh & Co. Kg Valve gun for a high-pressure cleaning device

Also Published As

Publication number Publication date
EP3442722B1 (en) 2021-06-09
CN109070106A (en) 2018-12-21
WO2017178073A1 (en) 2017-10-19
CN109070106B (en) 2021-05-14
DK3442722T3 (en) 2021-07-26

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