FI90829C - A filtering device - Google Patents

Description

90829 i

FILTER DEVICE

The invention relates to a filter device as defined in the preamble of claim 1.

Filter devices are already known on a watercraft for filtering engine seawater or freshwater cooling water in an open cooling water circuit. A typical filter device includes a filter housing with an inlet space and an outlet space inside. The filter device 10 further includes an inlet connection for conducting cooling water to the inlet space, an outlet connection for conducting cooling water out of the outlet space, a filter, e.g. a sieve, an orifice plate or the like arranged inside the filter housing between the inlet space and the outlet space. a cleaning connection with an orifice in the vicinity of the filter. The cooling water circuit further includes a water pump to provide a flow of cooling water through the filter device. In the open cooling water circuit, the cooling water is taken directly from the water element, sea, river, lake / where the vessel is operated by sucking the water through the strainer at the bottom of the vessel and passing it back to the engine condensing water.

A problem with the previously known filter devices is that they tend to easily become clogged when frost, sludge, municipal waste, seaweed and the like floating on the surface of the water enter the filter device. Repeated clogging generally occurs, especially when the filter device is installed in a shallow vessel, where water intake occurs from the vicinity of the water surface.

A further problem with the known filter device is that after clogging has occurred, the filter device 35 has to be cleaned by hand, which is cumbersome and time-consuming.

The object of the invention is to eliminate the above-mentioned drawbacks.

In particular, it is an object of the invention to provide a filter device which is automatically cleaned in a clogging situation without having to be opened and cleaned by hand.

The filter device according to the invention is characterized by what is stated in claim 1.

According to the invention, a vacuum is arranged inside the cleaning connection, and means with which the flow connection from the inlet to the cleaning connection can be substantially closed when water flows unobstructed through the filter and with which the flow connection can be substantially opened in the the substance exits the filter into the cleaning connection by means of the vacuum prevailing therein.

The advantage of the invention is that the filter device is automatically cleaned in the event of a blockage, if necessary, without having to be opened and cleaned by hand.

In one embodiment of the filter device, the filter comprises a screen plate which is pivoted at its edge so as to pivot relative to the filter housing and in which a closing member is arranged at the free edge of the screen plate for closing the cleaning connection; the filter device includes a spring device for holding the screen plate in a predetermined position with the screen plate in a transparent t-30; and means for closing and opening the flow connection to the cleaning connection consist of said articulated screen plate, a spring device and a closing member.

In one embodiment of the filter device, the screen plate 35 is in a substantially horizontal plane in the normal filtration position and in the cleaning position the screen plate is deflected at its articulation point around an angle.

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90829 From 3 straight levels down.

In one embodiment of the filter device, the upper edge of the mouth of the cleaning connection is substantially flush with the lower edge of the mouth of the inlet connection; and the sul-5 ball member is rigidly connected to the free edge of the screen plate to extend downward from the plane of the screen plate.

In one embodiment of the filter device, the filter includes a screen plate releasably mounted within the filter housing; means for opening and closing the flow connection from the inlet to the cleaning connection include a pressure detector arranged to indicate a change in outlet pressure when the screen plate becomes clogged, a shut-off valve arranged to close and open the flow connection to and from the cleaning connection, to close the shut-off valve on the basis of the information provided by the pressure sensor.

In one embodiment of the filter device, the filter device includes a suction device for applying a vacuum to the cleaning connection.

In one embodiment of the filter device, the suction device comprises a suction pipe, the first end of which is connected to the cleaning connection and the other end of which is inside the exhaust gas duct, the end of the suction pipe being directed in the flow direction of the exhaust gases.

The invention will now be described in detail with reference to the accompanying drawing, in which Figure 1 schematically shows an embodiment of a filter device according to the invention with a device 30 in normal use, Figures 1a and 1b show sections of Figure 1 / Figure 2 schematically shows a suction device belonging to another embodiment of the device according to the invention for creating a vacuum in the cleaning connection, and Fig. 4 schematically shows a third embodiment of a filter device according to the invention.

Figure 1 shows a filter device for installation in an open sea, water or fresh water cooling cooling water circuit of a watercraft engine to filter cooling water taken through a strainer 18 mounted on the bottom of the ship directly from the sea or further through the filter device. more precisely). The flow of cooling water through the filter device is provided by a water pump 7 arranged in the flow direction after the filter device. The filter device comprises a filter housing 1, in which there is an inlet-15 space 2 and an outlet space 3. The filter housing is preferably a box-shaped rectangular parallelepiped, as shown in the reduced sectional views 1a and 1b in Figure 1.

Cooling water enters inlet space 2 via inlet connection 4 20. The cooling water, in turn, leaves the filter device via the outlet connection 5. The filter 6 is arranged inside the filter housing between the inlet space 2 and the outlet space 3. Solids in the water, such as ice, sludge, municipal waste, algae, etc., remain in the filter. The filter device further comprises a cleaning connection 8, the mouth of which is in the vicinity of the filter 6. A continuous vacuum is arranged inside the cleaning connection 8 in some suitable manner, an example of which is shown in Fig. 3. The filter device further comprises an opening and closing closure member 10 with which the flow connection from the inlet space 2 to the cleaning connection 8 can be opened and closed. The filter device further comprises means for closing and, if necessary, opening the closing member 8 whenever the filter is clogged. Said means 35 open the closing member 10 to open the flow connection to the cleaning connection 8 when the negative pressure provided by the water pump 7 increases in the discharge space 3.

li 90829 5

In this example, the filter 6 is a planar screen plate 9, which is articulated at its edge so as to pivot relative to the filter housing 1. The screen plate 9 is e.g. a plate with numerous small openings. The inlet space 2 is the space above the screen plate 9 and the outlet space 3 is the space below the sieve plate 9. The filter device further comprises a spring device 11 for holding the screen plate 9 in a predetermined position, in a substantially horizontal position. The screen 9 is in a substantially horizontal position when it is 10 in a water permeable state, i.e. not clogged. The suction side of the water pump 7 is connected to an outlet connection 5 for sucking cooling water through a screen plate 9. Therefore, when the screen plate 9 is partially or completely blocked by the action of ice, sludge or the like, the vacuum generated in the discharge space 3 turns the screen plate 9 articulated around the spring force of the spring 11 downwards. The closure member 10 is a closure plate at the free edge of the screen plate, i.e. at the edge opposite the hinge point, which is arranged to partially close the flow connection from the inlet-20 child 2 to the cleaning connection 8 when the screen plate 9 is in a flattened state. A small current flows continuously from the inlet space 2 to the cleaning connection 8, which helps to keep the screen plate 9 25 clean. To control this small flow, the filter device comprises a conveying member 19, e.g. a convex screw or the like, arranged to keep a small gap between the closing member 10 and the opening of the cleaning connection 8 so that the closing member 10 does not completely close the opening 30 of the spring device 11.

In this example, the means for closing and, if necessary, opening the closing member 10 in the event of a filter clogging thus comprise the joint of the screen plate 9 and the spring device 11, By means of the closing member 9, the means open the screen plate downwards as shown in Fig. 2 and thus open the flow connection to the cleaning connection when the vacuum provided by the water pump 7 increases in the discharge space 3, whereby the accumulated material, such as water, is discharged. 5 are brought into the cleaning connection 8 by means of a vacuum arranged from the filter device. This cleaning function is repeated automatically whenever the pressure in discharge mode 3 falls below a predetermined limit.

The vacuum in the cleaning connection 8 is advantageously and simply provided by a suction device 16 according to Fig. 3, a so-called exhaust injector, which produces a vacuum by means of the suction effect produced by the flow of exhaust gases. The suction device comprises a suction pipe 17 arranged in the exhaust gas connection, the orifice of which is in the flow direction 15, whereby the exhaust gases flow past the pipe opening they suck air out of the suction pipe 17. The suction pipe 17 is connected to the cleaning connection 8, so that the material removed .

Fig. 4 shows an embodiment which differs from the embodiment of Fig. 1 in that the screen plate 12 is fixed inside the filter housing 1 in such a way that it is fixedly in place on the supports, but can still be removed if necessary. In this application 25, the means for opening and closing the flow connection from the inlet space 2 to the cleaning connection 8 include a pressure detector 13, e.g. a differential pressure sensor, an electrically controlled shut-off valve 14 in the cleaning connection 8 and a control device 15 for opening and closing the shut-off valve 14 30. The screen plate 12 is in an inclined position at the level of the lower edges of the inlet connection 4 and the cleaning connection 8, forming an inclined plane which leads to the cleaning connection 8. Normally, the shut-off valve is closed, whereby the flow of water 35 normally takes place from the inlet connection 4 through the screen plate 12 to the outlet connection 5. When the screen plate 12 becomes blocked in the outlet space 3, a vacuum starts and the flow takes place from the inlet connection 4 through the inlet space 2 by rinsing off the screening means 8 and the sieve-5 by means of a vacuum (e.g. provided by the arrangement of Fig. 3). After the screen 12 has been cleaned, the water pump 7 again receives water from the inlet connection, whereby the vacuum ceases in the discharge space 3. The sensor 13 detects this and instructs the control device 15 to close the shut-off valve 14, whereby normal circulation begins.

The invention is not limited solely to the application examples presented above, but many modifications are possible while remaining within the scope of the inventive idea defined by the claims.

Claims (7)

A filter device in a watercraft for filtering the engine cooling water in an open cooling water circulation, to which the filter device has a filter capsule (1), inside which is an inlet space (2) and an outlet space (3); an inlet connection (4) for conducting the cooling water to the inlet space; an outlet connection (5) for conducting the cooling water out of the outlet space; a filter (6) disposed within the filter capsule between the inlet compartment and the outlet compartment for filtering the cooling water; and a purge connection (8), the orifice of which is in the proximity of the filter (6), to which cooling water circulation causes a water pump (7) to effect the flow of cooling water through the filter device, a negative pressure is provided in the purge connection (8), and that the filter device thereto means with which the flow connection flow from the inlet space (2) to the purge connection can be substantially closed while the water is prevented from flowing through the filter by means of which the flow connection can be increased. at the occlusion of the filter when the negative pressure in the outlet space (3) increases under the action of the water pump (7), the filter occluding the material from the filter to the purification connection (8) with the aid of the present negative pressure. 2. A filter device according to claim 1, characterized in that a screening plate (9), which in its edge is pivotally guided in relation to the filter capsule (1) and in which the free edge of the screening plate, has a closure means, is provided for the filter (6). (10) before closing the purge connection; that the filter device has a spring device (11) for holding the screen plate in a predetermined position when the screen plate is in a permeable state; and l! 90829 11 that the means for closing and opening the flow connection to the purge connection consist of said guided screen, spring device and closure means. 3. A filter device according to claim 1 or 2, characterized in that the screen plate (9) in a normal filter position is in a substantially horizontal plane and in the purge lid the screen plate is pivoted about its point of contact at an angle from the horizontal layer 10 downwards. 4. A filter device according to claim 2 or 3, characterized in that the lower edge of the orifice of the cleaning connection (8) lies in substantially the same plane as the lower edge of the inlet connection (4); and that the closure means (10) is rigidly joined to the free edge of the screen plate extending from the face of the screen plate downwards. 5. A filter device according to claim 1, characterized in that a screen plate (12) is detachable for the filter (6), which is detachably obtained inside the filter capsule (1); that, to the means by which the flow connection from the inlet space (2) to the purge connection (8) can be opened and closed, a pressure detector (13) arranged to detect the change of the outlet space (3) is pressed when the sight plate is closed, a closing valve (14), which is arranged to close and open the flow connection from the inlet space to the purge connection, and a control device (15), which is arranged to open and close the closing valve on the basis of information given by the pressure detector. Filter device according to any one of claims 1 to 5, characterized in that a filter device (16) is provided for the filter device for generating a negative pressure in the cleaning connection (8). 7. A filter device according to claim 6, characterized in that, to the suction device 12 (16), a sucker (17), spring's first breath is connected to the purge connection (8) and second breath inside the exhaust duct so that the suction pipe's spirit is directed into the exhaust gas. flow direction. II