DE102009008204A1 - Suction device for polluted gaseous medium, particularly for air, comprises low pressure pump, and separator inserted between low pressure pump and suction connection - Google Patents

Abstract

The suction device (22) comprises a low pressure pump (10), and a separator (14) inserted between the low pressure pump and a suction connection (16). The separator comprises a drain valve (18) for emptying. The drain valve flows into a receiver storage (24), which is provided with another drain valve (26).

Description

The The invention relates to a suction device for contaminated gaseous media, with a vacuum pump and between the vacuum pump and the suction port intermediate separator for the impurities, wherein the separator has a drain valve for draining.

suction devices for gaseous media, especially for Air, are well known. Normally, these suction devices need no special precautions are taken. Are the gaseous media However, contaminated, interspersed with liquids, for example, needs it is a separator with which the fluids are taken from the air so that the subsequent vacuum pump will not be damaged. Particularly in the wet machining of workpieces, the sucked air contains liquids, z. As emulsions, and optionally also solid residues from Machining operation. If these liquids and / or residues in the Vacuum pump, it is damaged and falls out after a short time.

Around To prevent this, the prior art provides that a memory before the pump is switched, in which the liquid and accumulate residues. However, the tank must be emptied before the maximum fill quantity is reached. In time long machining operations There is a risk that the memory while editing his maximum capacity or capacity limit achieved, and then inevitably the machining process must be interrupted. To interrupt to avoid the machining process, becomes a second parallel Built system, which then takes over the suction task, while the first system emptied becomes.

Of the Invention is based on the object, a suction device ready to provide, whose structure is less expensive. In particular, should no interruption of the suction must take place.

These Task is in a suction device of the aforementioned Type according to the invention thereby solved, that the drain valve opens into a collecting tank and the collecting tank is provided with a second drain valve.

The has suction device according to the invention the significant advantage that the separator during the machining process can be emptied without the suction process being interrupted got to. Furthermore can be completely dispensed with a second system. To the Emptying the separator is provided a catcher, wherein between the separator and catcher, the first drain valve located. When this is open is, the separator emptied into the collection memory. Becomes the first drain valve closed, then the second drain valve open at the collecting tank and the catcher can go outside or another container be emptied.

at a development of the invention is provided that only each one of the two drain valves openable is. The two drain valves are switched so that either one or the other drain valve is open or both valves are closed. At the transition from the closed position in the open position are the drain valves in one embodiment switched so that they do not overlap, that is a drain valve its closed position occupies when the other drain valve is in an intermediate positions located. The separator is therefore never connected directly to the outdoors, or open to the outside.

at a development is provided that the separator as a vacuum reservoir is formed or contains a vacuum reservoir. On this way can when opening of the first drain valve and connecting the separator to the trap a small vacuum loss can be easily compensated. there The collection memory can have a storage capacity of 1% to 50%, in particular from 2% to 20% of the vacuum accumulator. In addition, can the catcher has a capacity to absorb contaminants from 1% to 50%, in particular from 2% to 20%, of the separator. To a filled up to the maximum limit separator Completely To empty, therefore, the emptying process in the collection memory several times perform. Therefor can set a certain, in particular adjustable number of drains be done one after the other.

Around the degree of filling of the separator, this invention has a first level sensor up, over which the drain valve is controlled. This will be the opportunity created, the separator on time and in particular automatically to empty it so that this only in exceptional cases its capacity limit reached. In this case, the first level sensor a float switch, an initiator or a measuring system, wherein the level sensor connected to a suitable control device for the drain valves is.

According to a preferred embodiment, the first fill level sensor opens the first bleed valve and at the same time closes the second bleed valve when the capacity limit or a predetermined and optionally adjustable fill level Ke is reached in the separator. This level mark is dimensioned so that the separator can be completely emptied during emptying completely into the collection memory. This level mark is below the capacity limit.

at a development of the invention, the collection memory has a second level sensor on. It concludes the second level sensor the first drain valve and opens the second drain valve when the capacity limit in the trap is reached. The now complete stuffed Collection tank can be emptied into the open air.

Preferably superimposed the signal of the second level sensor the signal of the first level sensor, so always for that it is ensured that the catch memory is in the empty state becomes.

Further Advantages, features and details of the invention will become apparent the dependent claims as well as the following description, with reference to FIG the drawing is a particularly preferred embodiment of the invention is described in detail. The illustrated in the drawing as well as in the description and in the claims mentioned features individually for themselves or be essential to the invention in any combination.

In show the drawing:

1 a particularly preferred embodiment of the invention; and

2 an embodiment according to the prior art.

First, the state of the art according to 2 Referenced. There is by means of a vacuum pump 10 the vacuum required for a suction generated, being directly to the vacuum pump 10 a first and a second shut-off valve 12 and 12 connected. In these shut-off valves 12 and 12 ' the exits of two separators open 14 and 14 ' , where the inputs of these two separators 14 and 14 ' via a third and a fourth shut-off valve 13 and 13 ' with a suction connection 16 are connected. About this suction connection 16 Air is sucked in, which is contaminated with liquids or solids. About the shut-off valves 12 . 12 ' 13 and 13 ' can the separator 14 and 14 ' be vented again after emptying, so that they are ready for use immediately, ie can be switched from one separator to the other separator without the negative pressure collapses.

With open shut-off valves 12 ' and 13 ' is over the separator 14 ' contaminated, z. B. aspirated with liquids displaced air. Is the separator 14 ' so far filled with contaminants that this has reached its capacity limit, the shut-off valves 12 ' and 13 ' closed, and the shut-off valves 12 and 13 open, allowing the air over the second separator 14 is sucked. Subsequently, a drain valve 18 ' opened and the contents of the separator 14 ' can, for example, in a drip tray 20 ' be drained. Subsequently, the drain valve 18 ' closed again. Is the separator 14 filled with contaminants, the shut-off valves 12 and 13 closed again and the shut-off valves 12 ' and 13 ' opened and the separator 14 , as before at the separator 14 ' described, emptied. It can be clearly seen that two complete separation systems are required for the continuous operation of the device.

In the suction device according to the invention 22 which in the 1 is shown, is only a single separator 14 required, so on the shut-off valves 12 . 12 ' . 13 and 13 ' can be waived. To the first drain valve 18 closes a catcher 24 on, which via a second drain valve 26 in the tub 20 opens.

The two drain valves 18 and 26 are switched so that only one of these two valves 18 and 26 can be open and the other is closed with certainty. In this way it is ensured that the in the separator 14 located negative pressure does not collapse, since the separator 14 at the same time as vacuum reservoir 28 is working.

Furthermore, in the separator 14 a first level sensor 30 provided, with which the filling height can be determined. This level sensor is via a suitable control device 32 both with the first drain valve 18 as well as with the second drain valve 26 connected.

Also the catcher 24 has a level sensor 34 on, over a control device 36 both with the second drain valve 26 as well as with the first drain valve 18 connected is. Finally, both are control devices 32 and 36 connected with each other.

With the suction device according to the invention 22 Air can be sucked in and out permanently, ie the suction connection 16 can be permanently supplied with negative pressure, regardless of whether the separator 14 is emptied or not, as permanently one of the two drain valves 18 and 26 closed is.

Claims (11)

Suction device ( 22 ) for contaminated gaseous media, in particular for air, with a vacuum pump ( 10 ) and one between the vacuum pump ( 10 ) and the suction connection ( 16 ) interposed separator ( 14 ) for the impurities, the separator ( 14 ) a drain valve ( 18 ) for emptying, characterized in that the drain valve ( 18 ) into a catcher ( 24 ) and the catcher ( 24 ) with a second drain valve ( 26 ) is provided. Suction device according to claim 1, characterized in that in each case only one of the two drain valves ( 18 and 26 ) is openable. Suction device according to one of the preceding claims, characterized in that the separator ( 14 ) as vacuum reservoir ( 28 ) is formed or a vacuum reservoir ( 28 ) contains. Suction device according to claim 3, characterized in that the collecting memory ( 24 ) a storage capacity of 1% to 50%, in particular from 2% to 20%, of the vacuum reservoir ( 28 ) having. Suction device according to one of the preceding claims, characterized in that the collecting memory ( 24 ) has an uptake capacity for impurities of 1% to 50%, in particular 2% to 20%, of the precipitator ( 14 ) having. Suction device according to one of the preceding claims, characterized in that the separator ( 14 ) a first level sensor ( 30 ) over which the drain valve ( 18 and or 26 ) is controllable. Suction device according to claim 6, characterized in that the first level sensor ( 30 ) is a float switch, initiator or a measuring system. Suction device according to claim 6 or 7, characterized in that the first level sensor ( 30 ) the first drain valve ( 18 ) and the second drain valve ( 26 ) closes when the capacity limit in the separator ( 14 ) is reached. Suction device according to one of the preceding claims, characterized in that the collecting memory ( 24 ) a second level sensor ( 34 ) having. Suction device according to claim 9, characterized in that the second level sensor ( 34 ) the first drain valve ( 18 ) and the second drain valve ( 26 ) opens when the capacity limit in the buffer memory ( 24 ) is reached. Suction device according to claim 8 and 10, characterized in that the signal of the second level sensor ( 34 ) the signal of the first level sensor ( 30 ) superimposed.