SE530297C2 - Screening and suction device for suctioning liquid from a liquid collection, on whose surface it is kept liquid - Google Patents

Description

25 30 530 29? a suction nozzle having a vertical center plane CI-CI, which coincides with the vertical center plane CC of the screen and suction device, and which is arranged in said space and fixedly connected to the first horizontal wall adjacent to its opening, which suction nozzle piece comprises - a suction cup, which has a suction chamber, an inlet opening and an outlet opening, which inlet opening faces and is in direct communication with the flow hole of the screen element, which suction cup comprises a first wall part facing the screen element and a second , downstream wall part having said outlet opening, and - an outlet pipe extending from the second, downstream wall part to the outside of the floating body, and communicating with the suction chamber via said outlet opening in the second wall part, that the first wall part slopes in the flow direction in the direction from the screen element so that the distance between the screen element and the inclined wall part increases in the direction of the second wall the suction cup, and the suction cup is designed so that the cross-sectional area of the suction chamber increases in the direction of the second wall part, the largest cross-sectional area being larger than the cross-sectional area of the outlet pipe, and that the outlet pipe is obliquely aligned with the screen element.

The strainer and suction device according to the invention are thus designed so that an optimal liquid flow is obtained through its suction chamber by no harmful turbulence occurring in the suction chamber and that the walls of the suction chamber withstand the forces created by the negative pressure prevailing in the suction chamber even at full power. in order thereby to avoid leakage in the suction chamber, which can otherwise lead to a negative pressure arising in the floating body itself, which can thereby be deformed and / or filled with water. Because no harmful turbulence occurs in the suction chamber, the floating body will float calmly in the water collection, ie. without being pulled in different directions in an anxious manner due to the shocking effects created by more or less powerful turbulences inside the suction chamber.

The invention is described in more detail in the following with reference to the drawings, where Figure 1 is a perspective view of a screen and suction device according to the invention; Figure 2 shows the device according to Figure 1 from the first side of its two larger sides, which face each other; Figure 3 shows the device according to Figure 1 from the other side of its two larger sides; Figure 4 is a view from one end of the device; Figure 5 is a view from the other end of the device; Figure 6 is a view from one long side of the device, a view not shown from the other long side being mirror-inverted; Figure 7 is a longitudinal sectional view of the device along the line A-A in Figure 2, showing the hollow floating body of the device and two nozzles of different dimensions; 10 15 20 25 30 35 530 29? Figure 8 is a perspective view of a first nozzle of the device of Figure 7; Figures 9, 10, and 11 show the nozzle according to Figure 8 in plan views from different directions; Figure 12 is a perspective view of a second nozzle of the device of Figure 7; Figure 13 shows the nozzle according to Figure 12 in a plan view from its pipe end; The terms "horizontal" and "vertical" refer to the position occupied by the screen and suction device when it is placed on a horizontal surface, e.g. floats on a water surface 'without being affected by any external forces.

A preferred embodiment of a combined screen and suction device according to the invention is shown in Figures 1-7.

The screen and suction device comprises a stable, hermetically sealed floating body 1 of a suitable plastic material, such as for instance polyester, vinyl ester or various types of thermoplastic.

The floating body 1 has a first horizontal wall 2, a second horizontal wall 3, two side walls 4, 5, a first end wall 6 and a second end wall 7. All adjacent walls 2-7 merge into each other via curved wall portions, whereby the floating body 1 thus lacks sharp edges along their sides. The floating body 1 is symmetrical about a vertical center plane C-C, which intersects the end walls 6, 7 and with which the side walls are parallel. The six walls 2-7 define an inner space 8, which comprises a gas-filled, usually air-filled volume. The first end wall 6 has a central wall portion 6a, which is retracted to 10 15 20 25 30 530 29? outside it form an easily accessible connection space 9, when a hose is to be connected to a screen and suction device by means of a connector of a predetermined dimension. The recessed wall portion 6a is provided with a central, circular opening 10 with a predetermined diameter. In the embodiment shown, the second end wall 7 also has a similar central wall portion 7a, which is retracted to form an easily accessible connection space 11, when a hose is to be connected to the screen and suction device, by means of a connector of a predetermined dimension, which differs from the dimension of the first connector. The recessed wall portion 7a of the second end wall 7 is likewise provided with a central, circular opening 12 with a predetermined diameter, which differs from the diameter of the opening in the first-mentioned wall portion 6a. Furthermore, a handle 13, 14 is formed at the center of each side wall 4, 5 to facilitate the handling of the screen and suction device, when it is to be carried from one place to another, for example. The first horizontal wall 2 has a central, recessed wall portion 2a, which extends between the end walls 6, 7 to form two outer wall portions 2b, 2c, which are similar to slides and which are intended to have a supporting function against the bottom surface of a water collection to maintain good suction power even in low water bodies. In the embodiment shown, the wall portion 2a is recessed 12 mm.

In general, this retraction can be in the range 5-20 mm, preferably 10-15 mm. Since the screen plate 15 with its inlet formed by the holes 16 is located in the retracted wall portion 2a, and the retraction creates a space 47 which is open to the sides in both directions, it is possible to suck water from a collection of water which is very shallow, such as 15 mm deep, when the indentation is 12 mm. 10 15 20 25 30 530 29? In the manufacture of the floating body, an opening 14 is formed in the recessed wall portion 2a of the first horizontal wall, which opening 14 has the shape of a segment of an oval, the larger part of the opening being located within the distal half of the recessed wall portion 2a in relation to the first end wall 6a, and with the curvature of the oval segment facing away from the first end wall.

A screen plate 15 is mounted on the first wall 2 to completely cover the opening 14. The screen plate 15 also has the shape of a segment of an oval, but thus has a slightly larger surface than the opening 14 so that the screen plate 15 has circumferential edge portions 15a, which is connected to the first wall 2 around its opening 14 to form a durable joint. The screen plate 15 is provided with a large number of small, uniform, circular holes 16 with a predetermined diameter. The holes 16 provide a total of a predetermined flow area. The screen plate 15 has a curvature 17, the ends of which are connected by a straight edge 18, which is perpendicular to said center plane C-C, and which is located within the front half of the recessed wall portion 2a in relation to the first end wall 6a. In the preferred embodiment shown, the second horizontal wall 3 is also provided with a similar screen plate 19, which likewise completely covers a similar opening 20 in the wall 3 and which is provided with a large number of small, uniform, circular holes 21 with a predetermined diameter. The holes provide a total of a predetermined flow area. The screen plate 19 has a curvature 22, the ends of which are connected by a straight edge 23, which is perpendicular to said center plane C-C.

Inside the float body 1, on the inside of the first horizontal wall 2, there is an elongate, first suction nozzle 25, which is symmetrical about a vertical center plane CI-CU which coincides with the vertical center plane C-C of the float body 1. The suction nozzle 25 comprises a suction cup 26, a mounting flange 27 and an outlet pipe 28. The suction cup 26 has a curved wall part 29 and a transverse wall part 30 relative to the center plane C, which is located downstream and merges into the curved wall part 29. A central outlet opening 31 is formed in the transverse wall part 30. The suction cup 26 delimits a suction chamber 32, which comprises an inlet opening 33, which has a curvature 34 in the form of a segment of an oval and a straight part, which connects the ends with each other. The mounting flange 27 has a planar shape and is arranged to enclose said inlet opening 33 in that it extends around and horizontally out from the upper part of the suction cup 26 in connection with the delimiting curvature 34 and straight part 39 of the inlet opening 33. The suction nozzle 25 is arranged to be fixed with its flat mounting flange 27 to the underside of the first, horizontal wall 2 by means of a suitable glue to obtain a strong joint. In this fixed assembly, the inlet opening 33 of the suction cup 26 will be directed towards the opening 14 of the wall 2 and the screen plate 15 to communicate with all the heels 16 in the screen plate 15. The outlet pipe 28 is connected to the straight wall part 30 of the suction cup 26 adjacent to its central outlet opening. 31 to communicate directly with the outside of the float body 1 via the suction chamber 32 and the flow hole 16 of the suction plate 15. The outlet tube 28 extends from the suction cup 26 towards the retracted wall portion 6a of the first horizontal wall 2.

The outlet pipe 28 has an inner pipe part 35, which is located closest to the suction cup 26, and an outer pipe part 36, which extends through said opening 10 in the retracted wall portion 6a to the connection space 9, where the outer end of the outlet pipe 28 is provided with a predetermined connector 37 for receiving the connector of the current hose (not shown). While the outer pipe part 36 10 15 20 25 30 530 297 extends horizontally and thus parallel to the first, horizontal wall 2, the inner pipe part 35 extends obliquely upwards from a first point located at a distance from the first wall 2 to a second point located immediately next to this wall 2 so that the center line of the inner pipe part 35 in its extension cuts the sieve plate 15 at an acute angle d. In the embodiment shown, this angle is α 22 °. In general, this angle α can be in the range 15 ° -40 °, preferably in the range 20 ° -30 °. The inner pipe portion 35 approaches the transverse wall portion 30 with a shape-changing cross-sectional area from circular to horizontal oval cross-sectional area with increasing ovality up to the outlet opening having the same shape and area as the nearest cross-sectional area of the outlet pipe. . The major axis of the oval is consequently horizontal and the minor axis vertical. The laterally expanding shape of the outlet pipe 28 facilitates the flow of liquid through the suction chamber from the holes 16 of the screen plate 15, which are located at its outer portions at a distance from the center plane C-C, to the oval outlet opening.

The largest cross-section of the suction chamber suction chamber 32, i.e. across the center plane CI-CI, is adjacent to the straight wall portion 30. The cross-sectional area is a circular segment of varying size in that it decreases continuously from the straight wall portion 30 toward the opposite end 38 of the suction cup 26, where the cross-sectional area approaches zero.

The suction cup 26, the mounting flange 27 and the outlet pipe 28 are made in one piece so that no joints are present between them which could be broken by external forces. Because the majority of the suction cup 26 is formed by the curved wall part 29, the suction cup 26 effectively resists large pressure differences between the outside and the inside of the curved wall part 29 through the curved shape.

In the embodiment shown, a similar, elongate, second suction nozzle 40 is also arranged on the inside of the second horizontal wall 3. This second nozzle 40 has a slightly smaller dimension than the first described nozzle 25, but is otherwise designed in the same way.

The nozzle 40 has a smaller connector 41 on the outer end of its outlet pipe 42. The nozzle 40 is thereby intended to be used for a pump with a lower capacity than the pump which is connected to the first described nozzle 25.

After a pump has been connected to its associated nozzle 25; 40, the floating body 1 is placed in a body of water with the side facing downwards, which has the screen plate 15; 19 which belongs to the connected nozzle 25; 40. When the pump is switched on, a negative pressure is created in the suction chamber 32; 44, whereby water is sucked in through the screen plate l5; l9 and the floating body is sucked or pulled down a small distance below the water surface so that the screen plate l5;

In addition, the floating body 1 becomes less sensitive to waves.

Due to the fact that the suction cup 26; 45 has a curved wall part in the middle of the suction plate l5; l9 and that its outlet pipe 28; 42 is directed towards the well-provided area of the sieve plate l1; l9, seen in a projection no harmful turbulence occurs in the suction chamber 15 20 25 30 530 297 10 maren 32; 44, which can give rise to shocks or twitches in the floating body 1, and instead an optimum liquid flow is obtained through the suction chamber 32; 44 and the outlet pipe 28; 43. Thus, water is sucked in through the screen plate 15; 19 and flows the nearest way through the suction chamber 32; 44 and out through the outlet pipe 28; 43 without being forced against any turbulence-generating flat surfaces which are located opposite the screen plate 15; The curved wall part 29; 46 also means that greater resistance to the negative pressure prevailing in the suction chamber is obtained even at full pump power than is the case with flat walls of a box-shaped suction cup. This avoids leakage in the suction chamber 32; 44 with consequent deformation and water filling of the floating body 1 itself.

The unique design of the suction nozzles according to the invention contributes to a reliable and efficient screening and suction device, where the specificity of the design lies partly in the outlet pipe's connection to the suction chamber so that the outlet pipe is obliquely directed towards the screen plate, and the first wall part of the suction chamber facing the screen plate , is inclined in the direction of flow so that the distance between the screen plate and the inclined wall part increases in the direction of the outlet and the suction cup in general, ie. its side walls, are designed so that the cross-sectional area of the suction chamber increases in the direction of the outlet. Thereby an optimal flow of water through the suction chamber is achieved in that the occurrence of such turbulences in the suction chamber is eliminated which adversely affects the flow of water from the screen plate to the outlet and which can also give rise to irregular twitches in the screen and suction device, which thereby behave restless on the water surface. The same negative pressure is present in the entire suction chamber and the risk of the walls being sucked in with the accompanying leakage is eliminated, which leakage can lead to the floating body being destroyed so that the entire screen and suction device must be discarded. The oblique orientation of the outlet pipe also means that the water will to a large extent flow obliquely towards the screen plate on its outside, which means that a favorable traction force is created in the screen and suction device so that it strives to be drawn in the direction from the end where the pump hose is connected to the strainer and suction device, whereby the hose will be stretched so that loops, twists, folds and the like disappear without manual action, which in turn facilitates and accelerates a rescue and extinguishing work.

The screen and suction device according to the invention can advantageously be produced by so-called vacuum injection of the plastic material into two molds for the floating body and one mold for each suction nozzle with two mold halves. The resulting joint surfaces are coated with glue, after which the joint surfaces are brought together to obtain strong, permanent glue joints, which are not destroyed at the current pressures. The nozzle is thereby produced in a single, coherent piece by molding and gluing. Vacuum injection enables the screen and suction device to obtain a desired low weight.

A screen and suction device according to the invention with the dimensions length 810 mm, width 600 mm and depth 258 mm has a weight of about 10 kg, which is produced by vacuum injection with the required wall thickness. In the described embodiment, the material thickness of the floating body is 3 mm, except for the wall portions which comprise adhesive joints, where the thickness is 9 mm, while the material thickness of the suction nozzles is 4 mm. The strainer and suction devices according to the invention are designed to suit the pump systems available on the market.

Thus, there are classified pumps, where the classes are divided according to the Swedish standard SS 3496 as follows: Class I, 400 liters / minute and 6 bar Class II, 1200 liters / minute and 10 bar Class III, 2400 liters / minute and 10 bar Sil- and the suction device with e.g. double suction nozzles according to the invention are equipped with replaceable connectors that fit the connectors of these different pump hoses, but it can also be equipped with connectors that suit individual needs.

A strainer and suction device according to the invention, which is suitable for the needs of the rescue services, has a floating body with an internal free volume of about 135 liters, while the largest nozzle has a suction chamber which is about 3 liters and the smallest nozzle has a suction chamber which is approx. 2 liters, which gives a volume ratio of 67.5 and 45, respectively.

The strainer and suction device according to the invention can be used in most occasions where water is needed for fire fighting, such as forest fires, and where some form of water collection is available, such as lakes, rivers and smaller watercourses as well as bogs and marshes. The strainer and suction device according to the invention enables the recovery of water from relatively shallow bodies of water, which e.g. arises during the actual extinguishing work and which has previously not been possible to use for the ongoing extinguishing work. Liquid debris and muddy bottoms do not pose a problem for the strainer and suction device due to its construction. The screen and suction device is also useful for evacuating water that has penetrated into spaces, such as rooms, basements, etc., in connection with precipitation.

The suction nozzle has been shown and described with reference to a preferred embodiment. For the same or other applications than the one mentioned above, the suction cup can of course be designed in many different ways within the scope of the patent claims. The cross section of the suction cup and thus the suction chamber may have a rectangular shape, the area of which increases towards the outlet, the said inclined wall part may be straight or curved, seen in a longitudinal section, and the two side walls may be straight and parallel to each other or angled in relationship to each other. They can also be curved. The transitions between adjacent wall portions are suitably curved to avoid sharp corners and thereby increase the strength of the suction cup at prevailing pressure differences. Even if the cross section of the suction cup is curved, as shown, the inclined wall part can be straight, seen in a longitudinal section.

Pl996SE TOl 060906

Claims (26)

10 15 20 25 30 530 29? 14 PATENT REQUIREMENTS Sieve and suction device for sucking up liquid from a liquid collection, on the surface of which it is kept liquid, and arranged to be driven by a liquid pump, characterized in that it comprises - a floating body (1) formed by walls (1-7) , WHICH comprises a first, horizontal wall (2) and a first end wall (6) and which delimits an inner space (8) with a gas-filled volume, an opening (10) being arranged within the central region of the first, horizontal path - gene (2), - a screen element (15), which is arranged to completely cover said opening (10) and which has a flow-through heel (16) with a predetermined total area, and - a suction nozzle (25), which has a vertical center plane CI-CI, which coincides with the vertical center plane CC of the screen and suction device, and which is arranged in said space (8) and fixedly connected to the first horizontal wall (2) adjacent to its opening (10), which suction nozzle comprises - a suction cup (26), which has a suction chamber (32), an inlet opening (33) and an outlet opening (31), which inlet opening (33) faces and is in direct communication with the flow hole (16) of the screen element (15), said suction cup (26) comprising a first wall part (29) facing the screen element ( 15) and a second, downstream wall part (30), having said outlet opening (31), and - an outlet pipe (28) extending from the second, downstream wall part (30) to the outside of the floating body (1). ), and which communicates with the suction chamber (32) via said outlet opening (31) in the second wall part (30), that the first wall part (29) slopes in the direction of flow in the direction from the screen element (15) so that the distance between the screen element (15) and the inclined wall part (29) increases in the direction of the second wall part (30), and the suction cup (26) is designed so that the cross-sectional area of the suction chamber (32) increases in the direction of the second wall part ( 30), the largest cross-sectional area being larger than the cross-sectional area of the outlet pipe (28), and that the outlet the ps tube (28) is oriented obliquely towards the screen element (15). Strainer and suction device according to claim 1, characterized in that the suction cup (26) comprises two side wall parts, which define a larger part of the inlet opening (33) of the suction cup (26) and are connected to the first and second wall parts (29 ), (30), which second wall part (30) defines the remaining part of said inlet opening (33). Strainer and suction device according to Claim 1 or 2, characterized in that the center line of the outlet pipe (28) forms an acute angle d with the strainer element (15). Strain and suction device according to claim 3, characterized in that said angle α is in the range 15 ° -40 °, preferably in the range 20 ° -30 °. Strain and suction device according to any one of claims 1-4, characterized in that the first wall part (29) is curved in a vertical section located in said center plane C4; and in each vertical section parallel to this plane. Screen and suction device according to any one of claims 1-5, characterized in that the first wall part (29) is curved in each vertical cross-section, which intersects said center plane C¿4; at right angles. Screen and suction device according to claim 6, characterized in that said cross section has the shape of a segment of a circle or oval. Strainer and suction device according to any one of claims 1-7, characterized in that said outlet opening (31) is arranged immediately next to the strainer element (15). Strainer and suction device according to one of Claims 1 to 8, characterized in that the outlet pipe (28) comprises an inner pipe part (35) directed towards the strainer element (15) located closest to the suction cup (26) and an outer, horizontal pipe part (36) , which passes into the inner pipe part (35) at an obtuse angle. Screen and suction device according to one of Claims 1 to 9, characterized in that the total area of the flow-through hole (16) is equal to or substantially equal to the cross-sectional area of the outlet pipe (28). 10 15 20 25 30 530 297 17 Strain and suction device according to one of Claims 1 to 10, characterized in that the flow-through holes (16) are circular with a diameter in the range 6-10 mm, preferably 8 mm. Strain and suction device according to one of Claims 1 to 11, characterized in that the outlet pipe (28) is provided with a connector (37) for connection to a corresponding connector of a hose which is connected to the liquid pump. Sieve and suction device according to any one of claims 1-12, characterized in that said first end wall (6) comprises a central, retracted wall portion (6a), which is arranged to delimit a protected space (9) for said connector ( 37) and through which the outlet pipe (28) extends. A screen and suction device according to claim 1, characterized in that the walls (1-7) of the floating body comprise a similar second, horizontal wall (3) and a second end wall (7). that a similar second nozzle (40) is arranged in said space (8) and fixedly connected to the second horizontal wall (3) in connection with its opening, and that the suction chambers of the two suction nozzles have different volumes. A suction nozzle suitable for a screen and suction device for sucking up liquid from a liquid collection, on the surface of which it is kept liquid, and arranged to be driven by a liquid pump, which screen and suction device comprises a floating body ( 1), which is formed by walls (1-7), which comprises a first, horizontal wall (2) and a first end wall (6) and which delimits an inner space (8) with a gas-filled volume, wherein a opening (10) is arranged within the central area of the first, horizontal wall (2), and a screen element (15), which is arranged to completely cover said opening (10) and which has flow holes (16) with a predetermined total area , characterized in that the suction nozzle (25), which has a vertical center plane CI-CI, which coincides with the vertical center plane CC of the screen and suction device, is arranged in said space (8) and fixedly connected to the first horizontal wall ( 2) adjacent to its opening (10), and that the suction nozzle comprises a suction opp (26), which has a suction chamber (32), an inlet opening (33) and an outlet opening (31), which inlet opening (33) faces and is in direct communication with the flow hole (16) of the screen element (15). , which suction cup (26) comprises a first wall part (29) facing the screen element (15) and a second, downstream wall part (30) having said outlet opening (31), and - an outlet pipe (28) extending from the second, downstream wall part (30) to the outside of the floating body (1), and which communicates with the suction chamber (32) via said outlet opening (31) in the second wall part (30), 10 15 20 25 30 530 297 19 that the first wall part (29) is inclined in the direction of flow in the direction of the screen element (15) so that the distance between the screen element (15) and the inclined wall part (29) increases in the direction of the second wall part (30), and the suction cup (26) is designed so that the cross-sectional area of the suction chamber (32) increases in the direction of the second wall part (30), the largest cross-sectional area n is larger than the cross-sectional area of the outlet pipe (28), and that the outlet pipe (28) is inclined towards the screen element (15). Suction nozzle according to claim 15, characterized in that the suction cup (26) comprises two side wall parts, which define a larger part of the inlet opening (33) of the suction cup (26) and are connected to the first and second wall parts (29). , (30), which second wall part (30) defines the remaining part of said inlet opening (33). Suction nozzle according to Claim 15 or 16, characterized in that the center line of the outlet pipe (28) forms an acute angle d with the screen element (15). Suction nozzle according to claim 17, characterized in that said angle α is in the range 15 ° -40 °, preferably in the range 20 ° -30 °. Suction nozzle according to any one of claims 15-18, characterized in that the first wall part (29) is curved in a vertical section located in said center plane CI-CI and in each vertical section parallel to this plane. 10 15 20 25 530 29? 20 Suction nozzle according to any one of claims 15-19, characterized in that the first wall part (29) is curved seen in each vertical cross-section, which intersects said center plane C¿4; at right angles. Suction nozzle according to claim 20, characterized in that said cross section has the shape of a segment of a circle or oval. Suction nozzle according to any one of claims 15-21, characterized in that said outlet opening (31) is arranged immediately next to the screen element (15). Suction nozzle according to one of Claims 15 to 22, characterized in that the outlet pipe (28) comprises an inner pipe part (35) located closest to the suction element (15) located closest to the suction cup (26) and an outer, horizontal pipe part (36) which passes over in the inner tube part (35) at an obtuse angle. Suction nozzle according to one of Claims 15 to 23, characterized in that the total area of the flow holes (16) is equal to or substantially equal to the cross-sectional area of the outlet pipe (28). 10 15 20 25 30 530 297 21 Suction nozzle according to one of Claims 15 to 24, characterized in that the flow-through holes (16) are circular with a diameter in the range from 6 to 10 mm, preferably 8 mm. Suction nozzle according to one of Claims 15 to 25, characterized in that the outlet pipe (28) is provided with a connector (37) for connection to a corresponding connector of a hose which is connected to the liquid pump. Pl996SE KSl 070308