WO2007107169A1

WO2007107169A1 - High-pressure spray gun for a high-pressure cleaning device

Info

Publication number: WO2007107169A1
Application number: PCT/EP2006/002621
Authority: WO
Inventors: Jürgen Binder; Vitali Fischer; Rolf Lindauer; Jörg SCHMID.
Original assignee: Alfred Kärcher Gmbh & Co. Kg
Priority date: 2006-03-22
Filing date: 2006-03-22
Publication date: 2007-09-27
Also published as: CN101400450A; EP1996337A1

Abstract

The application relates to a high-pressure spray gun for a high-pressure cleaning device with a housing (11) in which there is arranged a valve (20) which can be opened by means of a movably held actuating element (35) and to which a liquid supply line (73) can be connected, wherein the valve (20) has a valve housing (21) in which a closing body, which can be placed in a sealing manner against a sealing surface and interacts with the actuating element (35), is held in a movable manner. In order to develop the high-pressure spray gun in such a manner that it can be produced cost-effectively and nevertheless can be exposed to a high degree of pressure loading, it is proposed according to the invention that the valve housing (21) is manufactured from synthetic material and that an insert part (22) is held on the valve housing (21), wherein the insert part (22) is manufactured from a material resistant to water under pressure and forms the sealing surface and an inlet duct which is arranged upstream of the sealing surface and can be connected to the liquid supply line (73).

Description

Hochdruckspritzpϊstole for a high-pressure cleaning device

The invention relates to a high-pressure spray gun for a high-pressure cleaner with a housing in which a valve is arranged, which is openable by means of a movably held actuator and to which a liquid supply line is connected, wherein the valve has a valve housing, in which a sealing applied to a sealing surface and is held movably with the actuating element cooperating closing body.

Such high-pressure spray guns are used for high-pressure cleaning devices and make it possible to direct the cleaning fluid pressurized by the high-pressure cleaning device onto a surface to be cleaned, wherein the discharge quantity of the cleaning fluid can be regulated by means of the high-pressure spray gun. In particular, the flow of the cleaning liquid can be interrupted by means of the high-pressure spray gun. The cleaning fluid is pressurized by the high pressure cleaner and directed to the high pressure spray gun via a high pressure hose.

The high-pressure spray gun has a valve which can be opened by the user by means of an actuating element. If the actuating element, usually a pivoting lever, is released by the user, the closing body automatically moves into its closed position, in which the flow of the cleaning fluid is interrupted. When the valve is closed, a very high pressure forms briefly during operation of the high-pressure cleaning device upstream of the valve. This has the consequence that the valve is exposed to a considerable pressure load. The valve is therefore usually made of metal, for example in the form of a cast or turned part. This is stated in the European disclosure EP 0 261 320 A2. High pressure spray guns of the type mentioned are known from the patent DE 10 2004 006 592 B3.

Object of the present invention is to develop a high pressure spray gun of the type mentioned in such a way that it is inexpensive to produce and yet can be exposed to high pressure load.

This object is achieved in a high-pressure spray gun of the generic type according to the invention that the valve housing is made of plastic material and that an insert part is held on the valve housing, wherein the insert is made of a pressurized water-resistant material and the sealing surface and an upstream of the sealing surface arranged inlet channel is formed, which is connectable to the liquid supply line.

For cost-effective production of the high pressure spray gun according to the invention a valve housing made of plastic material is used. In contrast to a metal part, a valve housing made of plastic can be manufactured at a relatively low cost. Cost-effective plastic material, however, has only limited resistance to liquids that are under pressure. In many cases, the plastic material will become brittle in a relatively short time. According to the invention therefore the sealing surface and an upstream of the sealing surface arranged inlet channel of the valve are formed by an insert which is made of a pressurized water resistant material and which is held on the valve housing. The insert gives the valve the required strength against the pressurized cleaning liquid, so preferably pressurized water to which a cleaning chemical may be added. The mechanical forces that the insert part in operation of the high-pressure spray gun can be accommodated by the valve housing to which the insert is held, but the insert ensures the required pressure water resistance of the valve, in particular, the insert ensures the tightness of the valve. The insert is designed watertight, is held on the valve body and can be connected to the liquid supply line.

The insert part forms a pressurized water-resistant inlet channel upstream of the sealing surface. The area downstream of the sealing surface may be formed by the valve housing made of plastic material, since this area is exposed during operation of the high pressure spray gun to a lower pressure than the area upstream of the sealing surface.

The valve housing may for example be made of polyamide material or polypropylene material. This allows a particularly cost-effective production.

Preferably, the valve housing is made of a fiber-reinforced plastic material, in particular of a glass fiber reinforced plastic material. It can be provided, for example, that the valve housing is made of glass fiber reinforced polyamide or polypropylene material.

The insert is characterized by a high pressure water resistance. It is preferably made of metal, in particular of brass.

It can also be provided that the insert is made using polyoxymethylene (POM), polyethylene (PE) and / or polyurethane (PU). These materials are also characterized by a high pressure water durability, so that the high pressure spray gun according to the invention satisfies all safety requirements despite the use of inexpensive plastic material for the valve housing.

Preferably, the valve housing has a chamber into which the insert part is immersed at least with a front end region in the flow direction. This allows a structurally simple mounting of the insert part on the valve housing. The insert part can be fixed for example in its dipping into the chamber area by means of a retaining clip on the valve housing.

It is particularly advantageous if the chamber of the valve housing completely accommodates the insert part. Such a configuration is particularly favorable when the insert is made of plastic material, because by inserting the insert into the chamber optimal power transmission from the insert to the valve body can be achieved in a simple manner. The insert part can be designed with a low material thickness and lining the chamber of the valve housing on the inside. The insert ensures the pressure water resistance of the valve, occurring forces are transferred from the insert to the valve body.

A particularly preferred embodiment of the high-pressure spray gun according to the invention is characterized in that the valve housing forms a jacket, which encloses the insert part. This allows a flat contact of the insert part in the entire circumferential region, so that acting on the insert pressure forces can be absorbed evenly from the valve housing. The wall thickness of the insert part can thereby be kept relatively low, since it does not have to have a very high mechanical stability. The insert only has to take over the function, the valve design pressure water resistant, so that even a permanent load on the valve with pressurized cleaning fluid to no damage, especially to no leakage.

It is advantageous if at least one sealing element is arranged between the insert part and the valve housing. It can be provided, for example, that the insert part is surrounded by at least one sealing ring in the circumferential direction.

In a particularly preferred embodiment of the high-pressure spray gun according to the invention, the insert part forms an insertion section for insertion of a plug-in nipple. This gives the possibility to connect the insert easily with a high pressure hose. For this purpose, the high-pressure hose can carry at its free end a connection fitting with a plug-in nipple, which can be inserted into the insertion section of the insert part. An additional liquid supply line of the high-pressure spray gun, for example a pipe section arranged in the housing of the high-pressure spray gun, can thereby be dispensed with.

A particularly simple determination of the high-pressure hose on the insert part is achieved in a preferred embodiment in that the insert part and the valve housing at the level of the insertion section aligned with each other have lateral openings for receiving a cooperating with the plug-nipple securing bracket. The insert part, like the valve housing, may have two diametrically opposite lateral openings, into each of which a section of a securing bracket enclosing the valve housing can be inserted. The safety bar can in the usual way a circumferential collar of the plug nipple engage behind, so that it is held by the securing bracket in the axial direction immovably in the insertion of the insert part.

The following description of a preferred embodiment of the invention serves in conjunction with the drawings for further explanation. Show it:

FIG. 1 shows a schematic sectional view of a high-pressure spray gun according to the invention;

FIG. 2 shows an enlarged sectional view of the valve of the high-pressure spray nozzle from FIG. 1 and FIG

FIG. 3 shows a perspective view of the valve from FIG. 2.

Shown schematically in the drawing is a high-pressure spray gun, designated overall by the reference numeral 10, with a plastic housing 11 formed from two half-shells, which forms a grip region 12 with a handle 13 and a protective bow 14 and an outlet region 15 with an outlet 16. The housing 11 receives a valve 20 with a made of plastic material, in particular made of glass fiber reinforced polyamide or polypropylene material valve housing 21 and made of pressurized water resistant material, in particular made of brass insert 22 which is held on the valve housing 21 by placing it in a Chamber 23 of the valve housing 21 is inserted.

The valve housing 21 is substantially Y-shaped, wherein the insert part 22 is arranged in a base part 25 of the valve housing 21, from facing away from each other, a first housing leg 26 and a second housing leg 27 protrude. The first housing leg 26 forms an outlet line 29. At the free end of the first housing leg 26, a pipe section 30 is connected, which extends to the outlet 16 of the housing 11. In the region of the outlet 16, a per se known spray lance can be connected to the pipe section 30 via a bayonet coupling 32.

The free end of the second housing leg 27 forms a bearing 34, on which an actuating element in the form of a hand lever 35 is pivotably mounted. The hand lever 35 extends from the bearing 34 into the area between the handle 13 and the guard 14 and can be encompassed in this area by the user by hand.

The insert part 22 is designed in the form of a bush which is completely surrounded in the circumferential direction by the base part 25 of the valve housing 21. On the outside, the insert member 22 carries at a distance from each other two annular grooves 37, 38. The annular groove 38 receives a sealing ring 40. In the annular groove 37, a retaining clip 39 is inserted, which engages around the base part 25 laterally and determines the insert 22 immovable.

Starting from the free end of the base part 25, the insert part 22 has an insertion section 44, which merges into a cylindrical central section 47 via a contact section 46 conically tapering in the flow direction 45. A shoulder 48, which tapers conically in the flow direction 45 and adjoins an outlet section, adjoins the middle section 47 in the flow direction 45. The outlet section forms a sealing surface 49. The outlet section is followed within the valve housing 21 by a coaxially aligned with the longitudinal axis of the insert part 22 Through hole 51, from which the outlet line 29, which passes through the first housing leg 26 of the valve housing 21, branches off.

The insert member 22 receives a closing body 54, which is surrounded by a sealing ring 55 and sealingly against the sealing surface 49 can be applied. It is held at one end of a valve stem 57, which passes through the through hole 51. With its over the valve housing 21 projecting other end 48 of the valve stem 57 is located on a curved pressure plate 56 on the hand lever 35 at. The pressure plate 56 made of metal is clipped or cast in the hand lever 35. In a projecting beyond the valve housing 21 end portion of the valve stem 57 carries a support ring 59. Between the support ring 59 and the valve housing 21, a compression spring 60 is clamped, which acts on the valve stem 57 and the closing body 54 with a compressive force, that the closing body 54 under the Effect of the compression spring 60 automatically assumes its closed position. By pivoting the hand lever 35, the user can move the closing body 54 in the direction away from the sealing surface 49 for opening the valve 20.

At the level of the insertion portion 44, the insert 20 has two diametrically opposite openings in the form of two insertion slots 62, 63, each with a corresponding insertion slot of the valve housing

21 are aligned. As is clear from Figure 3, take the insertion slots 62, 63 each have a plug-in portion 66 and 67 of a securing bracket 68, with the aid of a plug-in nipple 70, which dips into the insertion portion 44 and rests with an annular shoulder on the abutment portion 46, in the axial direction is held immovable. The plug-in nipple 70 forms part of a connection fitting 71, via which a high-pressure hose 73 with the insert part

22 is releasably connectable. As already explained, by means of the high-pressure hose 73, pressurized cleaning liquid, preferably water, can be supplied to the high-pressure spray gun 10. The high-pressure hose 73 is connected directly to the insert part 22 via the connection fitting 71. The insert is made of a pressurized water-resistant material, namely made of brass or a high-quality plastic material, and thus has a high resistance, in particular tightness, compared to the pressurized cleaning fluid. It forms the sealing surface 49 and receives the closing body 54, which dips into the central portion 47. The insert 22 thus gives the valve 20 the required pressure water resistance, without requiring the entire valve housing 21 must be made of a high-quality plastic material or metal. The valve housing 21 is rather made of a very inexpensive plastic material, for example of polyamide or polypropylene material.

Claims

PATENT APPLICATIONS

1. High-pressure spray gun for a high-pressure cleaning device with a housing (11) in which a valve (20) is arranged, which by means of a movably held actuating element (35) can be opened and to which a liquid supply line (73) can be connected, wherein the valve (20 ) has a valve housing (21) in which a sealable to a sealing surface (48) and with the actuating element (35) cooperating closing body (54) is movably held, characterized in that the valve housing (21) is made of plastic material and that on the valve housing (21) an insert part (22) is held, wherein the insert part (22) is made of a pressurized water resistant material and the sealing surface (49) and an upstream of the sealing surface (49) arranged inlet channel (44) formed with the liquid supply line (73) is connectable.

2. High-pressure spray gun according to claim 1, characterized in that the valve housing (21) is made of a polyamide or polypropylene material.

3. High-pressure spray gun according to claim 1 or 2, characterized in that the valve housing (21) is made of a fiber-reinforced plastic material.

4. High-pressure spray gun according to claim 1, 2 or 3, characterized in that the insert part (22) made of metal, in particular made of brass.

5. High-pressure spray gun according to one of the preceding claims, characterized in that the insert part is made using polyoxymethylene, polyethylene and / or polyurethane.

6. High-pressure spray gun according to one of the preceding claims, characterized in that the valve housing (21) has a chamber (23) into which the insert part (22) dips at least with a front end portion.

7. High-pressure spray gun according to one of the preceding claims, characterized in that the insert part (22) by means of a retaining clip (39) is fixed to the valve housing.

8. High-pressure spray gun according to one of the preceding claims, characterized in that the valve housing (21) has a chamber (23) which completely accommodates the insert part (22).

9. High-pressure spray gun according to one of the preceding claims, characterized in that the valve housing (21) forms a jacket (25) which surrounds the insert part (22).

10. High-pressure spray gun according to one of the preceding claims, characterized in that the insert part (22) forms an insertion section (44) for insertion of a plug-in nipple (70).

11. High-pressure spray gun according to claim 10, characterized in that the insert part (22) and the valve housing (21) at the level of the introduction have cut (44) aligned with each other lateral openings (62, 63) for receiving a cooperating with the plug-in nipple (70) securing bracket (68).