EP2960483B1 - Device for separating dust in a dirty air area of a motor air intake of a vehicle, in particular a commercial vehicle - Google Patents

Description

The invention relates to a device for dust separation in the Rohluftbereich an engine air intake of a vehicle, in particular a commercial vehicle, according to the preamble of claim 1. Furthermore, the invention relates to a method for actuating a device for dust separation in the raw air region of an engine air intake of a vehicle, in particular a commercial vehicle according to the preamble of claim 8 and a vehicle, in particular a commercial vehicle, according to claim 9.

The sucked for operating an internal combustion engine of a vehicle fresh air is usually cleaned with a dust filter. In particular, in commercial vehicles for a dust-intensive use complex devices are used as so-called Grobstaubvorabscheider. Such a well-known coarse dust pre-separator as a multi-cyclone has at its input a plurality of swirl elements which set incoming fresh air into rotation. Due to the resulting centrifugal forces dust particles are deposited on surrounding walls. The separated dust particles fall down into a dust bin, which has a dust discharge valve on its underside. After the swirl elements, the pre-cleaned engine fresh air is passed through dip tubes in a common intake and fed as pre-cleaned, dedusted fresh engine air via the dust or main filter of the engine.

Depending on the circumstances and vehicle applications, the fresh air sucked in by the dust pre-separator can also contain water in addition to the dust, which is separated together with the dust. This can lead to sticking of the separated water-dust mixture, whereby the dust discharge valve is bonded and deactivated. This leads to a steady filling of the dust bunker and after reaching the full capacity, the degree of separation is reduced inadmissibly to zero.

It is therefore necessary to follow the instruction of the vehicle manufacturer and to open the dust discharge valve at appropriate intervals, for example, in a dusty use once a day, manually by pressing a closing element, whereby the dust discharge valve is activated again in its function in any gluing and clumping , Such manual operation of the dust discharge valve is often omitted by vehicle drivers partly for forgetfulness, partly for convenience or too late carried out so that the dust separation is practically ineffective. As a result, non-dedusted fresh air can get into the dust or main filter and thereby significantly reduce the dust or main filter life.

From the EP 1 223 333 A2 a dry air filter is known, is formed at a dust outlet through a pipe socket, at the end of a tapered outlet valve made of a rubber-like material connects, which has a need-openable outlet slot. Into the interior of the valve directed towards the outlet slit air duct is guided, which has a funnel-shaped widening nozzle attachment, so that when a supply of compressed air from a pressure accumulator, a suction pressure is generated, the dust sucks away from the air filter towards the outlet slot and also the Outlet slot for a dust discharge opens.

Next is from the DE 42 40 048 A1 a Staubaustragsventil known, which is employed at an angle to the vertical and in the region of a vertical end edge has a rubber-elastic cover, which is sealingly secured with its upper portion at the end edge.

From the Youtube video Th Glä: "parking brake truck animation", youtube, January 22, 2013 (2013-01-22), XP054977120, Found on the Internet: URL: https://www.youtube.com/watch?v=VkOgajl6zvE found on 2017-01-30 ] is a parking brake known, with the insertion of the same venting takes place.

The object of the invention is in contrast to ensure the function of the device for dust separation in the raw air of the engine air intake with simple and inexpensive measures.

This object is achieved with the features of the independent claims. Advantageous embodiments are the subject of the dependent claims.

According to claim 1 it is provided that the dust discharge valve has an outlet opening and the operationally separated dust is at least partially collected in a dust collecting area in front of the outlet opening. Furthermore, the dust discharge valve has a closing element, which is arranged in the outlet direction openable at the outlet opening and keeps it closed during engine operation by a closing force. The dust discharge valve is also controlled by means of an opening and / or free-blowing device and / or opened and / or freely-blown, so that no cumbersome manual operation the dust discharge valve is more necessary. The dust discharge valve is further equipped with a directed towards the outlet opening controllable blow-out as opening and / or blow-out device, with their blow-out pressure, the closure member can be opened and dust collected in the dust collection area dust from the dust discharge at appropriate intervals is blown.

Thus, the dust discharge valve is automatically opened and blown open at defined times and / or at defined time intervals. The blow-off pressure, the blow-out time and the amount of air used must be adapted to the prevailing circumstances to ensure safe opening and blowing out of accumulated dust from the dust discharge valve even in critical conditions of high dust and water.

With such an automated dust discharge valve, manual operation with the possibility of omissions and incorrect operation is no longer required and a good function of dust separation is ensured.

Furthermore, the blow-out device has an outlet nozzle, which is arranged in front of the outlet opening in front of the dust-collecting area and directed towards the latter. The exhaust nozzle can be arranged approximately centrally in a tubular valve body. Such a blow-off nozzle is preferably connected to a blow-out or pneumatic line with a controllable, preferably pneumatic, pressure source. In particular pneumatic pressure sources as pressure accumulators are regularly present anyway in vehicles, and in particular in commercial vehicles, so that such a blow-off device can be realized simply and inexpensively.

Suitably, such a blow-out or pneumatic line is connected via a control valve to the, for example pneumatic, pressure source of the vehicle. Depending on the circumstances and as required, such a control valve can be actuated for a blow-out process for predetermined time cycles and / or given operating conditions and opened briefly. For example, the control valve can be opened for a short time once or several times a day or with ignition lock control for each start-up procedure for the blow-out function.

A particularly simple and inexpensive to implement embodiment is inventively achieved in that the blow-off or pneumatic line is a vent line of a handbrake control valve, which blows off each time you insert a pneumatic parking brake air.

The above Staubaustragventil with the automated dust discharge function can be advantageously used in conjunction with known, built-in dust collectors, without that changes must be made there. In particular, such a dust discharge valve can still be seen vertically below the dust bin as seen in the vertical axis direction, in which case preferably the dust body connected to the bunker body region merges with a defined predetermined curvature in the discharge opening having dust collection area. For example, the tubular valve body can here run obliquely downward, in particular at an angle of approximately 120 °, towards the outlet opening. With such a sloping area, the dust accumulation for the blow-out function can be promoted there. Depending on the specific configurations and circumstances, dust from the upstream dust bin can also fall behind during the blow-out process and be blown out with it.

As a closing element different, known per se elements, such as lips made of elastomeric material can be used. As a well-suited and simple closing element is proposed hingedly hinged at an edge of the outlet opening and openable in the outlet direction flap. For the function of dust separation during engine operation, it is necessary that the dust discharge valve and thus the openable flap is securely closed. The closing force for this flap can be given, for example, by an operational negative pressure in the dust separation before the dust discharge valve. In addition, or alternatively, a biasing force, for example by a film hinge, can be applied to the flap for an airtight closure during engine operation. In any case, such a closing force is to be set in conjunction with the dimensioning of the blow-out device that the closing force can be over-pushed by the blow-off pressure and the flap can be opened.

The resulting with the inventive method and the vehicle according to the invention advantages are identical to the advantages mentioned above; insofar reference is made to avoid repetition of the above statements.

Reference to a drawing, the invention will be explained in more detail by way of example.

Fig. 1

einen vertikalen Schnitt durch einen Teil eines Grobstaubabscheiders mit einem erfindungsgemäßen Staubaustragventil,

Fig. 2

eine vergrößerte Darstellung des unteren Bereichs aus Fig. 1 mit einem Teil-Querschnitt durch das Staubaustragventil,

Fig. 3

eine vergrößerte, perspektivische Darstellung des Staubaustragventils, und

Fig. 4

das Staubaustragventil nach Fig. 3 in einer gedrehten Ansicht.

Show it:

Fig. 1

a vertical section through a portion of a coarse dust with a dust discharge valve according to the invention,

Fig. 2

an enlarged view of the lower area Fig. 1 with a partial cross section through the dust discharge valve,

Fig. 3

an enlarged perspective view of the Staubaustragventils, and

Fig. 4

the dust discharge valve after Fig. 3 in a rotated view.

In Fig. 1 a Grobstaubvorabscheider 1 is shown in a vertical section, as used in commercial vehicles for dust-intensive operations. This coarse dust pre-separator 1 is equipped with an automatic dust discharge valve 2 according to the invention.

The coarse dust pre-separator 1 has at inlet openings 3 for the intake dust-laden fresh air (arrows 4) each swirl elements 5, which in the stacked intake pipes 6, the dust-displaced incoming fresh air in rotation offset (shown by arrows 7). Due to the centrifugal force thus generated, the dust particles contained in the fresh air 8 are deposited on the inner wall of the intake 6 and from there down into a dust bunker 9. The pre-cleaned dedusted fresh engine air (arrows 10) passes through the rear with smaller outer diameter in the intake 6th inserted immersion tubes 11 in a common fresh air duct 12, where a common pre-cleaned and dedusted engine fresh air flow (arrow 13) is sucked by the internal combustion engine.

Below the dust bunker 9, the dust discharge valve 2 is connected, which is further in detail with reference to Fig. 2 to 4 explains:
Like from the 3 and 4 it can be seen, the dust discharge valve 2 is formed in the manner of a pipe bend with a sleeve portion 14 for a vertical tight connection to the bottom of the dust bunker 9. From the sleeve member 14 of the tubular valve body 15 extends arcuately obliquely downward toward an outlet opening 16. The slope points here for example, an angle 17 of 120 °. By this arbitrarily specifiable inclination is here in the lower region in the valve body 15 in front of the outlet opening 16, a dust collection area 18 is formed, as in particular FIG. 2 from the partial cross section of the dust discharge valve 2 can be seen.

The outlet opening 16 is here formed by a horizontally extending flat, firmly connected to the valve body 15 lip portion 19 and a folding axis 20 hinged (arrow 21) flap 22, wherein the flap 22 also has a flat front lip portion 23. In the illustrated closed state of the dust discharge valve 2 are the two Lip parts 19 and 23 close together, wherein the closed state is kept operationally by a Ansaugunterdruck in Grobstaubvorabscheider 1.

As from the sectional view in Fig. 2 can be seen, the dust discharge valve 2 also centrally on a discharge nozzle 24 which is arranged centrally in the valve body 15 in front of the dust collection area 18 and the outlet opening 16 and directed with its nozzle opening to the outlet opening 16. The exhaust nozzle 24 is connected to a pneumatic line 25 as a vent line to a (not shown) hand brake control valve of a pneumatic parking brake on each of the engagement of the parking brake briefly bleed air for venting and pressure reduction in the spring accumulator of the control valve. In the 3 and 4 connecting nipple 26 are shown for the pneumatic line 25.

The illustrated device for dust separation has the following function: each time the parking brake is engaged, a short burst of air is generated in the pneumatic line 25 and the discharge nozzle 24, through which the flap 22 is opened and dust is blown out of the dust collection area 18. The so-designed blower works safely and easily without additional solenoid valves and controls.

LIST OF REFERENCE NUMBERS

1

Coarse dust pre-separator

2

Dust discharge valve

3

entry ports

4

arrows

5

swirl elements

6

Induction

7

arrows

8th

dust particles

9

dust bunker

10

arrows

11

dip tubes

12

Fresh air duct

13

arrow

14

female member

15

valve body

16

outlet

17

angle

18

Dust collection area

19

lip portion

20

folding axis

21

arrow

22

flap

23

lip portion

24

Ausblasdüse

25

pneumatic line

26

nipple

Claims (9)

1. Device for dust separation in the untreated air area of an engine air intake of a vehicle, in particular a commercial vehicle, the device comprising a dust discharge valve (2) on the outlet side,
   wherein the dust discharge valve (2) comprises an outlet aperture (16) and the dust separated in operation is at least partially collected in a dust collection area (18) upstream of the outlet aperture (16),
   wherein the dust discharge valve (2) comprises a closing element (22), which is arranged on the outlet aperture (16) so as to open outwards in the outlet direction and which is closed by a closing force when the engine is in operation, and
   wherein the dust discharge valve (2) is controlled and/or can be automatically opened and/or blown free by means of an opening and/or blow-free device,
   wherein the dust discharge valve (2) in the inner area comprises a blow-off device (24, 25) directed towards the outlet aperture (16), the blow-off pressure of which serves to open the closing element (22) and to blow off the dust collected in the dust collection area (18) from the dust discharge valve (2),
   wherein the blow-off device comprises a blow-off nozzle (24), which is arranged upstream of the outlet aperture (16) upstream of the dust collection area (18) and is directed towards the outlet aperture (16), and
   wherein the blow-off nozzle (24) is connected by means of a blow-off line (25) to a controllable pressure source, characterized in that
   the blow-off line (25) is a venting line of a handbrake control valve of the vehicle, which blows off air each time a pneumatic parking brake is engaged.
2. Device according to Claim 1, characterized in that
   the blow-off line (25) is connected via a control valve to the pressure source of the vehicle, and
   the control valve can be actuated and opened for a blow-off sequence after predefined cycle times and/or in predefined operating conditions.
3. Device according to one of the preceding claims, characterized in that
   the dust discharge valve (2) is arranged on an upstream dust trap (9) at the bottom of the dust separation device (1), viewed in the direction of the vertical axis.
4. Device according to Claim 3, characterized in that
   the dust discharge valve (2) is connected to a valve body area of a tubular valve body (15), preferably oriented approximately vertically, at the bottom of the dust trap (9), viewed in the direction of the vertical axis, and
   the valve body area connected to the dust trap (9) merges with a predefined curvature into the dust collection area (18) comprising the blow-off aperture (16).
5. Device according to Claim 4, characterized in that the dust collection area (18) and hence the blow-off aperture (16) is inclined at an angle downwards, viewed in the direction of the vertical axis.
6. Device according to one of the preceding claims, characterized in that
   the closing element is a hinge-like flap (22) articulated on an edge of the outlet aperture and opening in the outlet direction, which with a defined closing force, preferably produced by an operating vacuum upstream of the dust discharge valve (2) and/or by a biasing force, keeps the outlet aperture (16) closed air-tight whilst the engine is in operation, and
   the flap (22) is designed so that an existing closing force can be suppressed by the blow-off pressure and the flap (22) thereby opened.
7. Device according to one of the preceding claims, characterized in that the device for dust separation upstream of the dust discharge valve (2) and/or in front of any upstream dust trap (9) comprises a coarse dust pre-separator (1) in the form of a multicyclone operating on a swirl-generation principle.
8. Method for the operation of a device for dust separation in the untreated air area of an engine air intake of a vehicle, in particular a commercial vehicle, the device comprising a dust discharge valve (2) on the outlet side,
   wherein the dust discharge valve (2) comprises an outlet aperture (16) and the dust separated in operation is at least partially collected in a dust collection area (18) upstream of the outlet aperture (16),
   wherein the dust discharge valve (2) comprises a closing element (22), which is arranged on the outlet aperture (16) so as to open outwards in the outlet direction and is closed by a closing force when the engine is in operation,
   wherein the dust discharge valve (2) is controlled and/or automatically opened and/or blown free by means of an opening and/or blow-free device at defined times and/or at defined time intervals and
   wherein a blow-off device (24, 25) directed towards the outlet aperture (16) is provided in the inner area, the blow-off pressure of which serves to open the closing element (22) and to blow off dust collected in the dust collection area (18) from the dust discharge valve (2) at defined times and/or at defined time intervals,
   wherein the blow-off device comprises a blow-off nozzle (24), which is arranged upstream of the outlet aperture (16) upstream of the dust collection area (18) and is directed towards the outlet aperture (16), and
   wherein the blow-off nozzle (24) is connected by means of a blow-off line (25) to a controllable pressure source, characterized in that
   the blow-off line (25) is a venting line of a handbrake control valve of the vehicle, which blows off air each time a pneumatic parking brake is engaged.
9. Vehicle, in particular commercial vehicle, having a device for dust separation according to one of Claims 1 to 7.

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