Apparatus for cleaning filters.

The invention relates to an apparatus for cleaning filters with at least one above the filter displaceably arranged openings such as nozzles having beams, originating from a pressurizable with a fluid such as compressed air cylinder, which is displaceable along a the end faces of the cylinder passing through the piston rod, the a stationary arranged the cylinder interior into two chambers dividing partition having.

When filter systems with z. B. Schwebstoffilterkörpern it is required that the filter body from time to time be cleaned. So called nozzle beam on the to be cleaned Schwebstoffilterkörper be moved to allow flow out of existing in the nozzle bar nozzle pressure air against the flow path of the gas to be purified. Thus, the required compressed air can be discharged from the nozzle beam and simultaneously a process of the nozzle beam holding cylinder is possible, flexible supply lines to the nozzle bar and separate supply lines are provided for cylinders that are supplied with the necessary compressed air. However, flexible leads require a susceptibility to interference, in particular when having the higher temperature gases to be purified. Further, it is necessary that the cylinder is moved along a guide, to ensure a security against rotation. Otherwise, the guide has no further function.

Object of the present invention is a device of the type described above so that no flexible leads an easy actuation of the nozzle beam having cylinder is possible, at the same time an anti-rotation should be guaranteed with functionally simple means.

The object is erf indungsgemäß achieved that is hollow to supply the chambers WITH THE fluid the piston rod for passage of the fluid, wherein each chamber is associated with a hollow portion formed in the piston rod and having to the chamber leading compounds.

According to the invention, consequently, the fluid such as pressure air supply via the piston rod will be made flexible so that leads are not required. Rather the compressed air is introduced from the end portions of the piston rod into it, so as to shift and to provide the nozzle bar with compressed air the cylinder. The drive of the cylinder and the cleaning of the filter takes place on one and the same compressed air. In each case a nozzle bar is basically positioned at each end of the cylinder in order to clean off each filter half along the entire path of displacement of the cylinder in the flow and return to (or in double-arrangement respectively a filter). Preferably, therefore, corresponds to the stroke of the cylinder to half the filter width or for double-arrangement of an entire filter width.

After an outstanding types standalone solution of the invention, a hollow cylinder designed to rotationally leading element is parallel to the piston rod is arranged, the acted upon with the fluid cavity is connected to one of the hollow portions of the piston rod. By this proposal, the supply of compressed air only needs to be done from one side of the device, ie, for. Example, via a holding element, which is arranged in an end region of the piston rod. Thereby, the supply of the fluid is particularly simple. The retaining member can be formed so that the required for controlling the pneumatic valve is connected directly z. B.. In the opposite end region of the piston rod a connection between the hollow guide member such as pipe and the corresponding hollow piston rod section is then placed in a correspondingly provided support means. Depending on the direction of movement of the cylinder, either one of the hollow portions of the piston rod will be directly supplied with compressed air or the other portion after the compressed air flows through the hollow design guide member.

According to one embodiment of the invention the piston rod of two pipe sections which are connected by a solid cylinder section, which merges into the interacting with the inner wall of the cylinder dividing wall. A particularly simple construction of the device is given which ensures high functionality and ease of maintenance.

According to another embodiment of the invention is in the connection between the cylinder chamber and nozzle bars each have a connection releasing or blocking element such. B. plunger valve, arranged. The tappet valves cooperate with limiting elements together such that the one cylinder chamber which is supplied with compressed air, is then shut off, when the cylinder has reached the respective end position of the stroke direction, at the same time the other tappet valve is opened. The tappets are expediently mechanically coupled.

By this arrangement, two is achieved:<ul><li>First, the flow of compressed air is shut off when the end position is reached without additional limit switches are needed and without the compressed air must be switched off from the outside.</li></ul>

Second, the connection must be shut off from the non-pressurized air cylinder chamber for nozzle bar during the lifting movement so that a speed control is possible by restricting exhaust air. The air still contained the previous stroke in the cylinder chamber is thereby displaced via the supply lines and a throttle valve.

Furthermore -as already known in the prior art additionally given actual the ability to control the movement of the cylinder by oil pressure damper or throttle valves to thus set or adjust the speed to the desired screen.

Through the inventive teaching a device for cleaning particularly filtering is first provided, which requires no flexible supply line, which are connected to moving elements such as the cylinder or the nozzle bar, as in the prior art such. B. DE -PS 22 62 084 is the case.

Further details, advantages and features of the invention result not only from the claims, the -for this in the features and / or in combination-but also from the following description of a shown in the drawings preferred embodiment.

In the single figure a between two boundaries like walls (12) and (14) is shown sliding device (10) for cleaning in particular filters, comprises a along a piston rod (16) movable cylinder (18). Of the cylinder openings or nozzles (20), (22) are of nozzle beams (21) and (23) supplied with compressed air. The compressed air is delivered through one of the nozzle bar (21) or (23) on a not-shown filter in order to clean this. The openings (20) and (22) of the nozzle bar (21) and (23), whose longitudinal axes extend perpendicular to the said piston rod (16) are arranged in the region of the end faces (58) and (60) of the cylinder (18), compressed air to be able to emit over the entire movement path. The inner cylinder chamber (24) by a partition (26) into two chambers (28) and (30) is divided, so as to enable a function of the compressed air supplied to a movement to the left or right along the piston rod (16). The compressed air itself is in the chambers (28) and (30) guided over the hollow formed piston rod (16), each chamber (28) or (30) is associated with a hollow-formed piston portion (32) or (34). In this case (16), the piston rod preferably consists of two pipe sections (36) and (38) to be assembled, over a full cylinder portion (40) are connected, which merges in turn in the partition (26) which is sealed against the inner wall (41) , In this way is given an effective separation between the hollow piston sections (32) and (34). In the region of the partition (26) has openings (42) or (44) in the wall of the piston rod (16) are recessed to provide a connection between the hollow section (34) and the chamber (30) or the section (32 ) and the chamber (28) to allow.

Parallel to the piston rod (16) a guide tube (46) according to the invention is also formed hollow and can flow through the compressed air. The connection between the guide tube (46) and the hollow portion (32) of the piston rod (16) now takes place via a channel (48) extending in a retaining element (50) in the exemplary embodiment, the right ends of the piston rod (16) or the guide tube (46) receives. The holding member (50) starts from the wall (14). The opposite end areas are picked up by a further holding element (52) in which bores (54) and (56) are recessed, which are selectively connected to a compressed air source not shown.

In the area of ​​the end faces (58) and (60) of the cylinder (18) go connections (62) or (64), which open into the nozzle beam (21) and (23). The terminals (62) and (64) are preferably designed as tappet valves to allow passage of compressed air either the nozzle (20) or (22) or not. This depends on, which takes the direction of movement of the cylinder (18). The nozzle (20) or (22) releasing or blocking tappet (66) and (68) act in the exemplary embodiment, together with the boundary walls (14) and (12) and to each other so as a function of the position of the cylinder ( 18) to bias the openings (20) and (22) associated with the nozzle bar with compressed air or not, and to control, on the opposite cylinder chamber to the exhaust air can.

The apparatus (10) according to the invention now operates as follows. In the embodiment, the cylinder (18) is in its right end position. In this way, the plunger (66) is conditionally shifted to the left so that the of the chamber (24) outgoing opening (70) is closed. Accordingly, applied pressure air can not reach the opening (20) of the nozzle beam (21) in said chamber (28). At the same time the opening (72) extending from the chamber (30) is released from the plunger (68), so that the chamber (30) is completely vented.

To start the cleaning operation, compressed air is passed over the opening (54) in the hollow portion (34) of the piston rod (16) and then flows via the opening (44) into the chamber (30) to the inner end wall (74) to apply. At the same time compressed air escapes from the chamber (28) via opening (42), conduit section (32), channel (48), guide tube (46), bore (56) and a throttle valve not shown here. Result of this, the cylinder (18) moves to the left. At the same time, compressed air flows via the opening (72) and the valve tappet (64) to the opening (22) of the nozzle beam (23). That the through chamber (30) compressed air flowing at the same time causes the movement of the cylinder (18) to the left, is based on the fact that the outlets (72) and (22) form a flow resistance so that a pressure build-up in the chamber (30) is carried out of the cylinder (18). Once the cylinder (18) reaches the left end position, acts an outer portion (76) of the plunger (68) with the wall (12) together. Result of this, the plunger (68) moves to the right, so that the opening (72) is closed. At the same time, the ram (66) of the tappet valve (62) shifted to the right, whereby the opening (70) is released. The cylinder can now be switched over by the compressed air is no longer led through the bore (54) but through the bore (56) to the cylinder portion (28).

In the exemplary embodiment, the supply of compressed air from the left side through the bores (54) and (56) of the device (10), so can of course also take place from the opposite side, ie from the holder (50) from the compressed air supply. Correspondingly, should a connection between the bores (54) and (56) are made, whereas the channel (48) is prevented. There is also the possibility that the compressed air does not flow over the guide tube (46), rather the sections hollow (32) and (34) are of the piston rod (16) are each acted upon by their ends with compressed air. Also in a corresponding construction, no flexible supply lines are required, which are connected to the moving cylinder (18).

Finally, it is noted that the compressed air used may have a pressure of 6 bar, with a partial pressure of 2-3 bar can be used to move the cylinder (18).