WO2014079494A1

WO2014079494A1 - High-pressure spray gun

Info

Publication number: WO2014079494A1
Application number: PCT/EP2012/073281
Authority: WO
Inventors: Vitali Fischer
Original assignee: Alfred Kärcher Gmbh & Co. Kg
Priority date: 2012-11-21
Filing date: 2012-11-21
Publication date: 2014-05-30
Also published as: EP2922637B1; CN104797345B; EP2922637A1; CN104797345A

Abstract

The invention relates to a high-pressure spray gun (10) for a high-pressure cleaning device, comprising a valve (20), which has a valve housing (22) with an inlet duct (48) and an outlet duct (34) and which also has a movable closing body (24), which interacts with a hand lever (40) to open and close the flow connection thereof between the inlet and outlet ducts (48, 34), and comprising a connecting part (50) for producing a detachable mechanical connection to a liquid delivery member (82) and a connection nipple (36), which is aligned colinearly to said connecting part (50), for producing a detachable flow-tight connection to said liquid delivery member (82). In order to develop the high-pressure spray gun (10) such that it can be produced, assembled and connected to a liquid delivery member in a more cost-effective manner, the invention proposes that the connecting part (50) and the connection nipple (36) be moulded onto the valve housing (22), wherein the connection nipple (36) has on its exterior an annular groove (68), in which a sealing ring (70) is arranged.

Description

HIGH PRESSURE SPRAY GUN

The invention relates to a high-pressure spray gun for a high-pressure cleaning device, comprising a valve, which has a valve housing with an inlet channel and an outlet channel and a movable closing body, which cooperates with a hand lever for releasing and closing a flow connection between the inlet and the outlet channel, and a connector for providing a releasable mechanical connection to a fluid delivery member and a colinear nipple aligned with the connector for establishing a fluid-tight connection with the fluid delivery member.

Such a high-pressure spray gun is known from publication WO

2007/107230 AI known. It is used in high-pressure cleaning devices and makes it possible to direct a high pressure cleaning device pressurized cleaning liquid, preferably water, on a surface to be cleaned, the delivery of the cleaning liquid can be controlled by the user by means of the hand lever. The hand lever cooperates with a closing body, which releases and closes a flow connection between an inlet channel and an outlet channel of the valve housing depending on the position of the hand lever.

To the high-pressure spray gun usually a liquid discharge member is connected. The latter may, for example, be a spray lance or a spray lance. Depending on the purpose of the high pressure spray gun different liquid delivery organs can be connected to the high pressure spray gun. The liquid delivery member is mechanically connected to a connection part of the high-pressure spray gun, and at the same time, a fluid-tight connection is established between the liquid delivery member and a connection nipple of the high-pressure spray gun. In the case of the high-pressure spray gun known from WO 2007/107230 A1, the connection nipple is designed as the end region of a pipe section which is connected as a separate component to the outlet channel during the assembly of the high-pressure spray gun. This increases the manufacturing and assembly costs of the high pressure spray gun. To produce a fluid-tight connection with the known hand-held spray gun, the liquid delivery member requires a connecting sleeve, which on the inside identifies an annular groove in which a sealing ring is arranged. The connection sleeve can then be plugged with the interposition of the sealing ring on the connection nipple of the high-pressure spray gun. The production of the inside annular groove and the mounting of the sealing ring in the annular groove is also associated with not inconsiderable costs.

Object of the present invention is to develop a high-pressure spray gun of the type mentioned in such a way that it can be produced and mounted more cost-effectively and mechanically in a cost-effective manner and fluid-tight manner with a liquid delivery member.

This object is achieved in a high pressure spray gun of the generic type according to the invention that the connecting part and the connection nipple are integrally formed on the valve housing, wherein the connection nipple on the outside has an annular groove in which a sealing ring is arranged.

In the case of the high-pressure spray gun according to the invention, the valve housing is connected in one piece with the connecting part and with the connecting nipple aligned colinearly with respect to the connecting part. With the help of the connecting part, a releasable mechanical connection with a liquid delivery member, for example with a spray lance, are produced, and by means of the connection nipple, which carries an annular groove on the outside, in which a sealing ring is arranged, a fluid-tight connection with the liquid discharge member can be produced. The high pressure spray gun according to the invention is characterized by a smaller number of components, which allow a more cost-effective production and assembly. The provision of an annular groove with a sealing ring on the outside of the connecting nipple has the advantage that in a simple manner, a sleeve-shaped part of the liquid delivery member can be plugged onto the connecting nipple with the interposition of the sealing ring. The production of a flow-tight connection between the high-pressure spray gun and the liquid delivery member is therefore very simple. It is not necessary in this case to introduce into the inside of the connecting sleeve of the liquid delivery member a relatively large cost a groove in which the sealing ring can be positioned. Instead, an annular groove is introduced with little effort into the outside of the connection nipple. To produce a fluid-tight connection, a cylindrical connecting sleeve, for example, can be plugged onto the connecting nipple having an annular groove on the outside, wherein at the same time a mechanical connection with the liquid-dispensing member can be achieved by means of the connecting part.

The connecting part conveniently has a receptacle for insertion of a complementary designed plug-in part of the liquid delivery member.

It is advantageous if the connection nipple dips into the receptacle. This makes it possible, for example, to insert a connection sleeve of the liquid delivery member into the receptacle, wherein an outside of the annular groove with the sealing ring exhibiting end portion of the connection nipple can dip into the connection sleeve.

It is advantageous if the connection nipple is aligned co-linear with the outlet channel of the valve housing. The collinear arrangement reduces flow losses for a cleaning liquid flowing from the inlet channel via the outlet channel to the connection nipple.

The connecting part is configured in a preferred embodiment of the invention as a bayonet coupling part. Such bayonet coupling parts are known per se to those skilled in the art. The bayonet coupling part can form a receptacle into which a complementarily formed bayonet coupling part of the Liquid dispensing member can be used in a known manner in a certain rotational position and then rotated to lock relative to the recording.

In order to be able to produce the annular groove of the connection nipple particularly inexpensively in an injection molding process, it is advantageous if the annular groove is arranged in a space between the valve housing and connecting part, wherein the intermediate space is accessible via two opposite access openings. The access openings allow removal from the surrounding the nipple in the circumferential direction annular groove. By providing the two opposing access openings, the valve housing can thus be produced together with the connection nipple, the annular groove and the connecting part in a simple manner in an injection molding process.

The annular groove arranged on the outside of the connection nipple accommodates a sealing ring, for example an O-ring. The sealing ring is made of an elastic material. In order to avoid damage to the sealing ring by ultraviolet solar radiation and also a mechanical damage of the sealing ring, the annular groove having region of the connecting nipple is arranged in an advantageous embodiment of the invention in a housing of the high-pressure spray gun. The housing may for example be formed by two half-shells, which receive the annular groove with the sealing ring having region of the connecting nipple and preferably also the valve housing between them. As a result, the sealing ring is protected against mechanical damage and damage from ultraviolet solar radiation.

The connecting part is rigidly connected in a preferred embodiment of the invention via two holding members with the valve housing, wherein an annular groove having the region of the connecting nipple is arranged between the two holding members. The two holding members have in the annular groove having region of the connecting nipple a distance from each other, so that suitable molds can be positioned between the two holding members in the production of the annular groove.

The holding members are preferably rigidly connected to each other via a support ring. The support ring gives the two support members a high mechanical strength.

The connection nipple is conveniently formed on the support ring. This makes it possible to support a spring element, for example compression spring, which surrounds the connection nipple in the circumferential direction, in the axial direction on the support ring. Such a support of a spring element is particularly advantageous if the connecting part is designed as a bayonet coupling part, because by means of the spring element, a complementary bayonet coupling part of the liquid discharge member can be acted upon by a spring force, which counteracts an unintentional release of the connection between the two coupling parts.

It is advantageous if the connection nipple carries in its adjoining the support ring end portion radially outwardly projecting clamping ribs. At the clamping ribs a compression nipple surrounding the nipple in the circumferential direction, which is supported on the support ring, are clamped.

It is advantageous if not only the connection nipple but also the outlet channel is arranged between the holding members.

In a preferred embodiment of the invention, the outlet channel is connected via two diametrically opposed connecting ribs rigidly connected to the support members. This increases the mechanical load capacity of the holding members and the connection part fixed to these.

It is advantageous if the high-pressure gun has at least one metallic spring element and / or at least one spring element, which is formed on the connecting part and made of a plastic material, for loading and unloading. supply of the liquid delivery member with a spring force. The spring force is preferably axially aligned. The spring force allows a particularly resilient mechanical connection between the high pressure spray gun and the liquid delivery member.

When using a connecting part in the form of a made of a plastic material bayonet coupling part, it is advantageous if two spring elements in the form of elastically deformable spring arms are formed on the bayonet coupling part, which are each arranged in a recess of the bayonet coupling part. By means of the spring arms, in each case a bayonet wing of a complementarily designed bayonet coupling part of the liquid delivery member can be subjected to an axial spring force.

A particularly cost-effective production and assembly of the high pressure spray gun is achieved in an advantageous embodiment, characterized in that the valve housing is formed in combination with the connecting part and the connecting nipple as a one-piece plastic molded part.

To the plastic molding of the hand lever may be hinged, which can be pivoted about a pivot axis by the user, thereby to move the closing member between a release position and a closed position back and forth.

The closing part may be designed as a valve tappet, which bears in a closed position in a flow-tight manner against a sealing surface of the valve housing and which occupies a distance from the sealing surface in a release position.

The following description of an advantageous embodiment of the invention is used in conjunction with the drawings for further explanation. Show it :

FIG. 1: a perspective view of a high-pressure spray gun according to the invention; FIG. 2 shows a side view of the high-pressure spray gun of FIG. 1, with a housing half shell removed;

Figure 3 is a perspective view of a valve housing of the high-pressure spray gun of Figure 1, wherein the valve housing in combination with a connection nipple and a connecting part forms a one-piece plastic molding, and

Figure 4 is a longitudinal sectional view of the high-pressure spray gun of Figure 1, wherein the high-pressure spray gun only partially shown liquid discharge member is connected.

In the drawing, an advantageous embodiment of an inventive high-pressure spray gun is shown schematically, which is generally occupied by the reference numeral 10. It has a housing 12, which is formed by a first housing half shell 14 and a second housing half shell 16. The housing 12 has a handle 18 in the manner of a pistol. In the housing 12, a valve 20 is arranged with a valve housing 22 and with a closing part in the form of a valve tappet 24. The valve housing 22 comprises a central part 26, which is penetrated by a through-passage 28 and from the side facing away from each other, a first leg 30th and a second leg 32 protrude. The first leg 30 forms an outlet channel 34, to which a connection nipple 36 connects in an aligned manner. The second leg 32 forms a support for a arranged at the free end of the second leg 32 pivot bearing 38. On the pivot bearing 38, a lever 40 is pivotally mounted. The hand lever 40 comprises a first lever arm 42 and a second lever arm 44. Starting from the pivot bearing 38, the first lever arm 42 extends substantially parallel to the handle 18, so that it can be grasped by the user together with the handle 18 with his fingers. The second lever arm 44 is considerably shorter than the first lever arm 42. At the free end of the second lever arm 44 of the valve stem 24 is located, which dips into the passageway 28 and in his in Figure 4 illustrated closed position fluid-tight against a sealing surface 46 of the passage channel 28. On the side of the sealing surface 46 facing away from the second lever arm 44, the through-channel 28 forms an inlet channel 48 of the valve housing 22. On the second lever arm 44 facing side of the sealing surface 46 branches off from the passageway 28 of the outlet channel 34. This becomes clear in particular from FIG.

By pivoting the first lever arm 42, the valve lifter 24 can be moved back and forth between a closed position and a release position. In its closed position, the valve plunger 24 abuts against the sealing surface 46 and interrupts the flow connection between the inlet channel 48 and the outlet channel 34, and in its release position, the valve stem 24 is spaced from the sealing surface 46 and releases the flow connection.

To the inlet channel 48 can be connected in a known manner, a supply line, for example a pressure hose, via which the high-pressure spray gun 10 can be supplied with cleaning liquid, which was set by a high-pressure cleaner under pressure.

On the side facing away from the handle 18 front of the housing 12 projects from the housing 12, a connecting part, which is configured in the illustrated embodiment as a bayonet coupling part 50. The bayonet coupling part 50 is integrally connected to the valve housing 22 via two holding members. The two holding members are designed in the illustrated embodiment as a straight, spaced-apart holding ribs 52, 54. The outlet channel 34 projecting from the middle part 26 of the valve housing 22 and the connection nipple 36 aligned with the outlet channel 34 are arranged between the two retaining ribs 52, 54, wherein the free end of the connecting nipple 36 dips into a receptacle 56 of the bayonet coupling part 50 aligned colinear with the connecting nipple 36. The outlet channel 34 is integrally formed with the retaining ribs 52, 54 via diametrically opposed connecting ribs 58, 60 projecting radially from the outlet channel 34 connected. At its free end, the outlet channel 34 is surrounded by a support ring 62, on which the two retaining ribs 52, 54 are supported. The connecting ribs 58 and 60 extend from the support ring 62 to the central part 26 of the valve housing 22.

The connection nipple 36 carries on its outer side the support ring 62 immediately adjacent a plurality of clamping ribs 64 which are arranged distributed uniformly over the circumference of the connecting nipple 36 and on which a compression spring 66 shown in Figure 4 is clamped. The compression spring 66 surrounds the adjoining the support ring 62 end portion of the connecting nipple in the circumferential direction and is supported in the axial direction on the support ring 62 from.

In the area between the clamping ribs 64 and the bayonet coupling part 50, the connecting nipple 36 has on its outer side an annular groove 68 which receives a sealing ring 70 shown schematically in FIGS. 2 and 4. The annular groove 68 is arranged in a gap 72 between the valve housing 22 and the bayonet coupling part 50, which is accessible via two lateral access openings. The two access openings are opposite each other and are limited in the longitudinal direction of the connecting nipple 36 from the support ring 62 and the bayonet coupling part 50 and transversely to the longitudinal direction of the connecting nipple 36 of the two retaining ribs 52 and 54. The two access openings make it possible to remove the annular groove 68. This will be discussed in more detail below.

The bayonet coupling part 50 has, in addition to the receptacle 56 two diametrically opposed recesses 78, 80, which are formed as openings of the bayonet coupling part. In the recesses 78, 80 protrude elastically deformable spring arms 79 and 81, which are integrally formed on the bayonet coupling part 50.

To the high-pressure spray gun 12, a liquid discharge member, such as a spray lance, are connected. FIG. 4 partially shows a fluid delivery device in the form of a tubular piece 82. The pipe piece With its end region facing the high-pressure spray gun 10, 82 forms a bayonet coupling part 84 which is complementary to the bayonet coupling part 50 and has a connection sleeve 86 from which two bayonet wings 88, 90 protrude radially outward on opposite sides of the connection sleeve 86. The connecting sleeve 86 forms a complementary to the receptacle 56 ausgestaltetes male part and can be inserted into the receptacle 56 and attached with an end portion on the connecting nipple 36. When attaching the connection sleeve 86 to the connection nipple 36, the sealing ring 70 assumes a position between the connection nipple 36 and the connection sleeve 86 and thereby ensures a flow-tight connection between the connection nipple 36 and the connection sleeve 86.

The receptacle 56 of the bayonet coupling part 50 of the high-pressure spray gun 10 is designed such that the connecting sleeve 86 with the two bayonet wings 88, 90 in a first rotational position against the action of the compression spring 66 can be inserted axially into the receptacle 56, wherein the connecting nipple 36 with the annular groove 68 and the sealing ring 70 positioned therein dips into the connecting sleeve 86, and then the connecting sleeve 86 can be rotated about its longitudinal axis by 90 °, so that the two bayonet wings 88, 90 dive into the recesses 78, 80 and the spring arms 79, 81 be subjected to an axially directed spring force. By such a plug-in rotary movement, a mechanically load-bearing and flow-tight connection between the high-pressure spray gun 10 and the pipe section 82 can be produced. If the pipe section 82 is to be released again from the high-pressure spray gun 10, then it is only necessary to turn the connecting sleeve 86 back into the original rotational position with the two bayonet wings 88, 90 and then to pull it out of the receptacle 56.

The high pressure spray gun 10 can be manufactured inexpensively. The valve housing 22, in combination with the two holding ribs 52, 54, the connecting nipple 36 and the bayonet coupling part 50, forms a one-piece plastic molded part, which are manufactured in an injection molding process can. The side access openings between the valve housing 22 and the bayonet coupling part 50 make it possible in this case in a simple manner to demould the annular groove 86.

The housing 12 surrounds not only the valve housing 22 but also the retaining ribs 52, 54 and in particular the region of the connecting nipple 36, in which the annular groove 68 is arranged with the sealing ring 70. As a result, the sealing ring 70 is protected against mechanical damage and also against ultraviolet solar radiation, which could affect the elasticity of the sealing ring 70 and thus its sealing effect. The high-pressure spray gun 10 is therefore not only characterized by cost-effective production and assembly but also by a long service life.

Claims

P A T E N T A N S P R E C H E

High-pressure spray gun for a high-pressure cleaning device, comprising a valve (20) having a valve housing (22) with an inlet channel (48) and an outlet channel (34) and a movable closing body (24), which is used to release and close a flow connection between the inlet and exhaust passage (48, 34) cooperating with a hand lever (40), and having a connection member (50) for providing a releasable mechanical connection to a liquid delivery member (82) and a colinear nipple (36) aligned co - linear with the connection member (50) detachable fluid-tight connection with the liquid delivery member (82), characterized in that the connecting part (50) and the connecting nipple (36) are integrally formed on the valve housing (22), wherein the connecting nipple (36) on the outside an annular groove (68), in the a sealing ring (70) is arranged.

High-pressure spray gun according to claim 1, characterized in that the connecting part (50) has a receptacle (56) for insertion of a complementary designed plug-in part (86) of the liquid discharge member (82).

High-pressure spray gun according to claim 2, characterized in that the connection nipple (36) is immersed in the receptacle (56).

High-pressure spray gun according to one of the preceding claims, characterized in that the connecting nipple (36) is aligned colinearly to the outlet channel (34).

5. High-pressure spray gun according to one of the preceding claims, characterized in that the connecting part is designed as a bayonet coupling part (50).

6. High-pressure spray gun according to one of the preceding claims,

characterized in that the annular groove (68) is disposed in a clearance (72) between the valve housing (22) and the connector (50), the space (72) being accessible via two opposing access ports.

7. High-pressure spray gun according to claim 6, characterized in that an annular groove (68) exhibiting region of the connecting nipple (36) in a housing (12) of the high pressure spray gun (10) is arranged.

8. High-pressure spray gun according to one of the preceding claims,

characterized in that the connecting part (50) is rigidly connected via two retaining members (52, 54) to the valve housing (22), wherein an area of the connecting nipple (36) having the annular groove (68) is interposed between the two retaining members (52, 54). is arranged.

9. High-pressure spray gun according to claim 8, characterized in that the two holding members (52, 54) via a support ring (62) are rigidly interconnected.

10. High-pressure cleaning device according to claim 9, characterized in that the connection nipple (36) is integrally formed on the support ring (62).

11. High-pressure spray gun according to claim 10, characterized in that the connection nipple (36) in a subsequent to the support ring (62) end portion radially outwardly projecting clamping ribs (64).

12. High-pressure spray gun according to one of claims 8 to 11, characterized in that the outlet channel (34) between the two holding members (52, 54) is arranged.

13. High-pressure spray gun according to claim 12, characterized in that the outlet channel (34) via two diametrically opposed connecting ribs (58, 60) with the holding members (52, 54) is rigidly connected.

14. High-pressure spray gun according to one of the preceding claims,

characterized in that the high pressure spray gun (10) at least one metallic spring element (66) and / or at least one of the connecting part (50) integrally formed, made of a plastic material spring element (79, 81) for acting on the liquid discharge member (82) with a spring force ,

15. High-pressure spray gun according to one of the preceding claims,

characterized in that the valve housing (22) in combination with the connecting part (50) and the connecting nipple (36) forms a one-piece plastic molded part.