EP1621254B1 - Gun with manual shut off comprising a pressure-balanced hand lever - Google Patents

Description

The invention relates to a manual shut-off pistol with pressure-relieved hand lever, in particular for high-pressure cleaning devices, according to the preamble of patent claim 1.

Such Handabschaltpistolen for high-pressure cleaning devices with pressure-relieved lever are already out of the DE 101 59 680 C1 , of the WO 03/045572 A1 , as well as the DE 102 37 428 B3 and the EP 1 389 495 A1 known.

The DE 101 59 680 C1 and the WO 03 / 045572A1 show a closing device for the liquid discharge line of a high-pressure cleaner with a arranged in the liquid discharge line closing body, which is pressed with a closing force against a valve seat and thereby closes the liquid discharge line and by a mechanical, sealed from the liquid discharge line exiting and displaceable by means of a hand lever actuator of the valve seat can be lifted when the hand lever is moved in the direction of an open position. In order to reduce the holding forces when the spray gun is open, it is proposed that in the liquid discharge line downstream of the valve seat a displaceably mounted piston emerges sealed from the liquid discharge line and when pushing out of the liquid discharge line in operative connection with the hand lever that this moves in the direction of its open position becomes.

The DE 102 37 428 B3 and the parallel EP 1 389 495 A1 show a very similar closing device for the liquid discharge line of a high-pressure cleaner, but the displaceably mounted piston flow is stored on ward of the valve seat.

Disadvantage of DE 101 59 680 C1 , of the WO 03/045572 A1 , as well as the DE 102 37 428 B3 and the EP 1 389 495 A1 is that an additional control element for the Relief of the hand lever is required, in the form of a sealed in an additional bore movable separate piston 17, which leads to increased manufacturing, maintenance and repair costs. In addition, the piston 17 has only a small area as an attack surface for the fluid pressure, so that the force is limited to the hand lever.

Object of the present invention is, starting from the above-described prior art, to provide a Handabschaltpistole with pressure-relieved lever, which is designed much simpler and thus cheaper and more reliable and also can cause a greater force on the hand lever.

To solve the problem serve the features of claim 1.

It is characteristic that the actuating rod has at least one stage of greater radial dimension than its base body, so that within the actuating bore results in a high-pressure chamber and a low-pressure space, and that downstream of the valve, between the liquid discharge line and the high-pressure chamber extends a pressure-conducting control bore.

Advantage of the present invention is that the control bore located downstream of the valve between the liquid discharge line and the high-pressure chamber of the actuating bore directs the media pressure on the back of the trained as a stepped piston actuating rod of the valve. There must therefore be no additional moving and sealed control piston as in the prior art, but only a media pressure-conducting control bore and the formation of the already existing sealed operating rod between the hand lever and valve as a stepped piston. As a result, the manual force required by the user for the hand lever for operating the high-pressure cleaner is better supported, since a larger attack surface for the medium by the radial step collar of the actuating rod is present.

Advantageous embodiments of the present invention are the subject of the dependent claims.

Due to the at least one radially extending step on the main body of the axially movable actuating rod, the actuating bore for the actuating rod is divided into a first and a second space. Since the control bore forms a pressure-conducting connection between the media delivery line and one of the spaces of the actuating bore for the actuating rod, this space is referred to as the high-pressure chamber, since the medium pressure is present in this high-pressure chamber when the valve is opened. Separated from this high-pressure chamber via the at least one radially extending step, the second chamber, which has a lower pressure, than the high-pressure chamber, when the media pressure prevails there after opening the valve. Therefore, the second space is referred to as a low pressure chamber, which is either hermetically sealed or connected via a vent hole with the environment, so that there is always ambient pressure of about 1 bar in the low pressure space.

However, if the low-pressure chamber is hermetically sealed, then the air trapped there is displaced as the valve is opened until the compressed air enclosed there corresponds to the medium pressure prevailing in the high-pressure chamber. Thus, a damping and limitation of the axial travel of the actuating rod is created in the direction of valve spring.

However, it is preferred that the low pressure space is connected via a vent hole with the environment, in which case the manual force of the user during opening and keeping the valve open by the force difference is supported on the step collar of the actuating rod between the high pressure chamber and low pressure space, against the force of the valve spring ,

wobei $$\mathrm{\Delta F}(\mathrm{Hoch}-/\mathrm{Niederdruckraum})=\mathrm{\Delta p}(\mathrm{Hoch}-/\mathrm{Niederdruckraum})\times \mathrm{A}$$

mit A = Fläche Ringstufe der Betätigungsstange in der Betätigungsbohrung und Δp = p(Medium) - p(Umgebung) bei Entlüftung
oder Δp = p(Medium) - p(komprimierte Luft in Niederdruckraum) bei geschlossenem NiederdruckraumThe hand force to be expended by the user is thus: $$\mathrm{F}\left(\mathrm{hand}\right)=\mathrm{F}\left(\mathrm{feather}\right)-\mathrm{.DELTA.F}\left(\mathrm{High-pressure\; chamber}/\mathrm{Low-pressure\; chamber}\right)$$

in which $$\mathrm{.DELTA.F}(\mathrm{High}-/\mathrm{Low-pressure\; chamber})=\mathrm{Ap}(\mathrm{High}-/\mathrm{Low-pressure\; chamber})\times \mathrm{A}$$

with A = surface Ring stage of the actuator rod in the actuation bore and Δp = p (medium) - p (ambient) with venting
or Δp = p (medium) - p (compressed air in low-pressure space) with the low-pressure space closed

When venting the low-pressure space, it is by the user expended hand force so: $$\mathrm{F}\left(\mathrm{hand}\right)=\mathrm{F}\left(\mathrm{feather}\right)-\left(\mathrm{p}\left(\mathrm{medium}\right)-\mathrm{p}\left(\mathrm{Surroundings}\right)\right)\times \mathrm{A}$$

Wherein the surface of the ring stage of the operating rod is always chosen so that the hand force never zero, so that when you release the hand lever, the valve always reliably automatically closes.

In a preferred embodiment of the invention, the low-pressure chamber is arranged closer to the valve spring than the high-pressure chamber and therefore the valve is opened by pushing the actuating rod on the valve body against the force of the valve spring as a compression spring.

In another embodiment of the invention, the high-pressure chamber is arranged closer to the valve spring than the low-pressure chamber and therefore the valve is opened by pulling the actuating rod together with the valve body against the force of the valve spring as a compression spring.

Furthermore, the invention can be very reasonably priced integrate into existing designs of Handabschaltpistole, so that a simple retrofitting of old models of Handabschaltpistole is easily possible.

Furthermore, it is also possible to provide the complete stepped piston as a replacement set in the form of a cartridge solution, so that not only the stepped piston is replaceable, but also a surrounding this cartridge, which is then interchangeable arranged in the gun body. This allows a simple adaptation to different media pressures done, as well as to different valve inserts with differently biased valve spring.

In the following, the invention will be explained in more detail with reference to a drawing, which represents only one embodiment. Here are the drawings and their description further features and advantages of the invention.

Figur 1:

die erfindungsgemäße Handabschaltpistole in geschnittener Teilansicht;

Figur 2:

Prinzipskizze der Ausführung der Figur 1;

Figur 3:

Prinzipskizze einer alternativen Ausführung zur Figur 1.

Show it:

FIG. 1:

the Handabschaltpistole invention in a sectional partial view;

FIG. 2:

Schematic diagram of the execution of FIG. 1 ;

FIG. 3:

Schematic diagram of an alternative embodiment to FIG. 1 ,

In FIG. 1 the Handabschaltpistole invention is shown in a sectional partial view, with the main components gun housing 1, lever 2 and valve. 5

The hand lever 2 is arranged in the upper region on the gun housing 1 and there in pivoting directions 4 and 4 'pivotally mounted on a pivot axis 3. If the hand lever 2 in the pivoting direction 4 (counterclockwise) operated by a user, the valve 5 is opened, wherein the retrieval of the hand lever 2 in the pivoting direction 4 '(clockwise) by means of the spring 15 of the valve via the actuating rod 16.

The valve 5 locks in the idle state, the liquid discharge line 6 and separates them into an upper part 7, in which the operating pressure of the liquid prevails, and an upper part 7 angled, lower part 8, which is depressurized at rest. The separation of the upper 7 and lower part 8 of the liquid discharge line 6 is accomplished by a located in the upper part 8 valve ball 14 which is pressed by means of the compression coil spring 15 (also located in the upper part 8) on a valve seat 13. The valve seat 13 is located on the transition edge of a stepped bore 11 a with a first smaller 11 b and second larger diameter 11 c in a valve housing 11 which is releasably inserted via a seal 12 in the gun body 1, depending on the medium and operating pressure different valves. 5 to be able to use.

Top in the FIG. 1 , So downstream of the valve ball 14 of the valve 5 is located on the valve ball 14, the one free end of the actuating rod 16, wherein on the other free end of the actuating rod 16 of the hand lever 2 rests with its reinforcement 2a. By pivoting the hand lever 2 in the pivoting direction 4, the actuating rod 16 is axially in the direction of movement 24 down in FIG. 1 displaceable and thereby the valve 5 can be opened.

The actuating rod 16 is in this case received in an actuating bore 18 sealed by seals 20, wherein the actuating bore 18 has a lower annular collar 19 which serves as an end stop for the axial movement of the actuating rod 16, which by an upper screwed and sealed end cap 23 from falling out is secured. The actuating rod 16 itself is stepped and has two annular steps 17 of larger diameter than the rod-shaped base 16 a of the actuating rod 16.

The actuating rod 16 is guided in its axial movement 24 on the one hand to its base 16 a through the annular collar 19 of the bore 18, on the other hand by means of the steps 17 of the actuating rod 16, the radially invest against the inner wall of the bore 18 slidably and further by radial abutment of the Main body 16a at a through hole 23b of the end cover 23, so that tilting of the actuating rod 16 in the bore 18 is thereby prevented.

Between the two stages 17 of the actuating rod 16, a seal 20 is present, as well as above the upper stage 17 in the region of the lid 23 and below the annular collar 19 of the bore 18. All seals 20 have the purpose of the under operating pressure medium (eg water ) not to let escape undesirably through the bore 18 from the gun body 1, but through the discharge line 6 in the flow direction 9 out of the outlet 10, which is designed as a nozzle (not shown).

According to the invention, a control bore 22 in the gun housing 1 is now introduced in the lower part 8, downstream of the valve 5, which forms a pressure-conducting connection between the discharge line 6 and the high-pressure chamber 25 in the actuating bore 18. The control bore 22 thus extends from the downstream of the valve 5 located lower part 8 of the discharge line 6 to behind the outer annular end face 17a of the last stage 17 of the actuating rod 16, which outer end face 17a of the spring 15 of the valve 5 faces away. The high-pressure chamber 25 is thus formed by the outer annular end face 17a of the last, outermost step 17 (farthest from the spring 15) and by the main body 16a in this end region, and by the inner wall of the actuating bore 18 in this outer end region and the inner recess 23a of the end cover 23 and, if necessary, a seal 20a introduced between the last, outermost step 17 and the end cover 23.

Between the inner annular end face 17b of the innermost step 17 (at least far from the spring 15) and the annular collar 19 of the bore 18, a low pressure space 26 is formed, which is connected through a vent hole 21 to the environment, so that in the low-pressure chamber 26 always Ambient pressure prevails in order not to undesirably damp the axial movement of the actuating rod 16 in the bore 18.

Incidentally, the end cap 23, the operating rod 16 having steps 17, the associated bore 18, the valve body 11 and the discharge conduit 6 are preferably circular in cross-section, but may be of any other shapes, e.g. polygonal, square, rectangular, triangular, ellipsoidal, oval, etc. Also, the term "bore" is to be understood very broadly and is not bound to any particular machining process so that the holes can be made by other manufacturing techniques, e.g. EDM process, injection molding, etc.

If the hand-trigger gun is now to be operated, then the user moves the hand lever 2 in the direction 4 downwards in FIG FIG. 1 pivoted so that the hand lever 2 presses on the outermost free end of the actuating rod 16 and this moves axially downwards in the direction 24, whereby the valve ball 14 is pressed down against the spring force of the spring 15 and lifts off the valve seat 13. Now located in the upper part 7 of the discharge line 6 upstream of the valve 5 located under high pressure medium (eg water + additives) via the valve seat 13 in the downstream of the valve 5 located lower part 8 of the discharge line 6 in the flow direction 9 and at the outlet 10th emerge from the gun body 1. A very small part of the pressure medium flows in this case initially through the control bore 22 in the high-pressure chamber 25 in the bore 18 and builds here on the operating pressure to hold the operating rod 16 in the pressed down in the direction 24 operating position and to support the holding force of the user , From the low pressure chamber 26, the air escapes through the vent hole 21 in the open.

If the manual shut-off pistol is subsequently switched off again, the hand lever 2 is released and this then pivots upwardly in the pivoting direction 4 'due to the force of the spring 15 FIG. 1 so that the actuating rod 16 moves axially upwards against the direction 24, whereby the valve ball 14 is pushed upward by the spring force of the spring 15 and is pressed sealingly onto the valve seat 13. Now, in the upper part 7 of the discharge line 6 located upstream of the valve 5 under high pressure medium again from the downstream of the valve fifth located lower part 8 of the discharge line 6 hermetically separated. The operating pressure located in the lower part 8 of the discharge line 6 and in the control bore 22 in the high-pressure chamber 25 is discharged via the discharge nozzle 10 into the atmosphere, in order to bring the actuating rod 16 counter to the direction 24 in the upper rest position. Through the vent hole 21, air is sucked from the environment in the low-pressure chamber 26.

The control bore 22 according to the invention thus fulfills the purpose, after actuation of the hand lever 2, to hold this in its depressed operating position and thereby to support the holding force of the user. However, the control bore 22 does not fulfill the purpose of keeping the operating position without manual force of the user, so that after releasing the hand lever 2, this returns to its original position and thereby closes the valve 5.

FIG. 2 shows a schematic diagram of Handabschaltpistole after FIG. 1 , wherein like reference numerals represent like components. It can be seen that the low-pressure chamber 26 is arranged closer to the valve spring 15, as the high-pressure chamber 25 and therefore the valve 5 is lifted by thrust of the actuating rod 16 against the valve body 14 against the force of the valve spring 15 from the seat 13 and opens.

FIG. 3 shows a schematic diagram of the Handabschaltpistole in an alternative to FIG. 1 , wherein like reference numerals again represent like components. It can be seen that the high-pressure chamber 25 is arranged closer to the valve spring 15 than the low-pressure chamber 26 and therefore the valve 5 is lifted by train of the actuating rod 16 together with the valve body 14 against the force of the valve spring 15 from the seat 13 and opened.

Figure Legend

1.

gun housing

Second

Hand lever, 2a reinforcement

Third

Swivel axle of 2

4th

Swing direction of 2 (open valve 5)

5th

Valve

6th

Fluid delivery line

7th

Upper part of 1

8th.

Lower part of 1

9th

flow direction

10th

Liquid outlet (nozzle)

11th

Valve housing; 11 a stepped bore, 11 b, 11 c diameter

12th

poetry

13th

valve seat

14th

Valve body (ball)

15th

feather

16th

Actuating rod; 16a basic body

17th

Stages of 16; 17a outermost end annular surface of 17; 17b innermost annular surface of 17

18th

Operation bore for 16

19th

Ringbund in 18

20th

seals

21st

vent hole

22nd

control bore

23rd

End cover for 16 in 18; 23a inner recess; 23b through hole

24th

Movement direction from 16 to 18

25th

High pressure room in 18

26th

Low pressure room in 18

Claims (12)

1. Hand-gun with shut-off, with pressure-relieved hand-lever (2), in particular for high-pressure cleaning appliances, wherein a valve (5) inside a housing (1) of the hand-gun shuts off a liquid discharge line (6) when a valve-closing component (14) is pressed against a valve seat (13) by the force of a spring (15), and wherein the valve-closing component (14) is liftable off the valve seat (13) against the force of the spring (15) by means of the hand-lever (2) via an actuating rod (16) axially displaceably guided inside an actuating bore (18), and the holding force of the hand-lever (2) when the valve (5) is opened and held open is indirectly assisted by the pressure of the medium, characterized in that the actuating rod (16) possesses at least one step (17) with a larger radial dimension than its shank (16a) so that a high-pressure space (25) and a low-pressure space (26) are created within the actuating bore (18), and in that a pressure-conducting control bore (22) downstream of the valve (5) extends between the liquid discharge line (6) and the high-pressure space (25).
2. Hand-gun with shut-off according to Claim 1, characterized in that the low-pressure space (26) is located nearer to the valve spring (15) than the high-pressure space (25) and the valve (5) is opened by a push of the actuating rod (16) on the valve-closing component (14) against the force of the valve spring (15), or contrariwise in that the high-pressure space (25) is located nearer to the valve spring (15) than the low-pressure space (26) and the valve (5) is opened by a pull of the actuating rod (16) together with the valve-closing component (14) against the force of the valve spring (15).
3. Hand-gun with shut-off according to Claim 1 or Claim 2, characterized in that the low-pressure space (26) is sealed off or is pressure-conductingly connected to atmosphere either directly or indirectly via an air vent (21).
4. Hand-gun with shut-off according to Claims 1 to 3, characterized in that the shank (16a) of the actuating rod (16) is guided by a radial shoulder (19) of the actuating bore (18) of smaller diameter, sealed with a sealing ring (20).
5. Hand-gun with shut-off according to Claims 1 to 4, characterized in that at least two steps (17) are present on the actuating rod (16).
6. Hand-gun with shut-off according to Claim 5, characterized in that sealing rings (20) are fitted between the steps (17) on the actuating rod (16).
7. Hand-gun with shut-off according to Claims 1 to 6, characterized in that the at least one step (17) is formed integrally with the shank (16a) of the actuating rod (16), as one piece.
8. Hand-gun with shut-off according to Claims 1 to 7, characterized in that the actuating rod (16) and the associated actuating bore (18) are circular in cross-section.
9. Hand-gun with shut-off according to Claims 1 to 8, characterized in that the control bore (22) is circular in cross-section and/or forms a passage of uniform cross-section.
10. Hand-gun with shut-off according to Claims 1 to 9, characterized in that the control bore (22) branches off the liquid discharge line (6) at an angle of approximately 90°.
11. Hand-gun with shut-off according to Claims 1 to 10, characterized in that the control bore (22) branches off the actuating bore (18) at an angle of approximately 45°.
12. Hand-gun with shut-off according to Claims 1 to 11, characterized in that at its narrowest point the control bore (22) possesses approximately 1-5% of the cross-sectional area and/or 10-30% of the diameter of a lower part (8) of the liquid discharge line (6) in the region of the control bore (22).

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