JP4415354B2 - Pump for dredging - Google Patents

Description

  The present invention relates to a pump device for dredging sediment at the bottom of the water, and more particularly to a dredge pump device for sucking up and discharging sediment using negative pressure and compressed air.

As this type of pump device, there is one described in Patent Document 1. As shown in FIG. 6, a suction valve 4 is disposed in a pipe line 3 that connects a sealed pump body 1 and a suction device 2 that collects sediment at the bottom of the water. A discharge valve 6 is disposed in the discharge pipe 5 extended to the outside, and the suction valve 4 and the discharge valve 6 are alternately opened by repeating the introduction of the negative pressure A and the introduction of the compressed air B into the pump body 1. The pump is configured to suck up earth and sand from the suction device 2 through the pipe line 3 into the pump main body 1 and discharge the sucked up earth and sand through the discharge pipe 5 to the outside. According to such a pump device, since dredging can be performed without diffusing earth and sand around the surroundings, generation of secondary pollution is prevented and it is useful for high-concentration dredging of soft mud soil. Normally, two pump bodies 1 are arranged in parallel in front and rear of the saddle direction for one suction device 2, and switching between introduction of negative pressure and introduction of compressed air to the front and rear pump bodies 1 is performed. In addition, it is possible to continue dredging. Further, switching between introduction of negative pressure and introduction of compressed air to each pump body 1 is performed according to liquid level detection by the upper limit detection rod 7 and the lower limit detection rod 8 disposed in the pump body 1.
Japanese Patent Publication No.49-45500

  By the way, in the conventional pump device described above, the pipe 3 connecting the pump body 1 and the suction device 2 is piped from the bottom of the pump body 1, so that the pump body 1 is connected to the bottom surface of the suction device 2. The height to the upper surface (total height) was quite large (for example, more than 5 m). Therefore, when the water depth in the basin is shallow, as shown in FIG. 6, the upper portion of the pump body 1 protrudes above the water surface, whereby the upper liquid level in the pump body 1 and the surrounding water surface level The so-called water head difference ΔH increases, and the efficiency of sucking mud into the pump body 1 is reduced. In order to cope with this problem, the pump main body 1 may be reduced in size and the overall height may be lowered, but in this case, the dredging ability is inevitably lowered.

  The present invention has been made in view of the above-described conventional problems, and the object of the present invention is to reduce the water head difference as much as possible without reducing dredging ability, and thus to achieve a desired mud absorption even in dredged areas where the water depth is shallow. An object of the present invention is to provide a dredge pump device that can ensure efficiency.

In order to solve the above-described problems, the present invention provides a discharge valve in which a suction valve is disposed in a pipe line connecting a sealed pump body and a suction device that collects sediment at the bottom of the water, and extends from the inside of the pump body to the outside. A discharge valve is provided in the pipe, and the suction valve and the discharge valve are alternately opened by repeating negative pressure introduction and compressed air introduction into the pump body, and from the suction device through the pipe line. In the dredging pump device that sucks up the earth and sand into the pump body and discharges the sucked up earth to the outside through the discharge pipe, the pipe is arranged in a box arranged in parallel with the body of the pump body. The suction valve is disposed in a valve box detachably attached to the main body of the box, the main body of the box is connected to the body of the pump main body through the valve box , and the The inhaler is directly connected to a box.

In the soot pump device configured as described above, a pipe line connecting the pump main body and the suction device is disposed in a box disposed in parallel with the body of the pump main body, and the suction valve is disposed in the main body portion of the box body. Since the main body of the box is connected to the body of the pump main body through the valve box and the suction device is directly connected to the box , the pump main body The relative positional relationship between the inhaler and the inhaler approaches, and the total height decreases and the head difference decreases.

  According to the dredging pump device according to the present invention, the overall height is reduced without changing the size of the pump body, so that the water head difference can be reduced without lowering the dredging ability, and the dredged area having a shallow water depth. However, the desired mud absorption efficiency can be ensured and its utility value is increased.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 and FIG. 2 show the overall structure of a bag pump device that is one embodiment of the present invention. Similar to the conventional pump device shown in FIG. 6, the present pump device includes two pump bodies 10A, 10B arranged in parallel and one suction device 30, and includes two pump bodies. 10A, 10B and one suction device 30 are connected via a box 50, which will be described in detail later, disposed between the two pump bodies 10A, 10B. Each pump body 10A, 10B has a sealed structure in which the upper and lower openings of the cylindrical body 11 are covered with cover plates 12, 13, and the two pump bodies 10A, 10B are the upper part of each body 11. It is rigidly connected and integrated by a pair of main connection frames 14 bridged between them. A pair of sub-connecting frames 15 are bridged between the lower portions of the body 11 of the two pump bodies 10 </ b> A and 10 </ b> B, and the box 50 is supported by the pair of sub-connecting frames 15.

  A shaft (trunnion shaft) 16 is attached at an intermediate position between the pair of main connection frames 14 so as to be orthogonal to the main connection frame 14. The shafts 16 are extended from a hull (not shown) at both ends. The tip of the ladder 17 (FIG. 2) is connected via a bearing 18. An auxiliary frame 19 is bridged between the upper cover plates 12 of the two pump bodies 10A and 10B, and a link bar (in parallel with the ladder 17) extends from the hull at an intermediate position of the auxiliary frame 19. A hinge bracket 20 is provided in a protruding manner for pivotally attaching the front end portion (not shown). That is, the entire pump device is supported by the hull via the parallelogram link including the ladder 17 and the link bar, and moves vertically and horizontally (swings) in a fixed posture according to the movement of the ladder 17. It has become.

  Further, compressed air / negative pressure supply pipes 21A and 21B are connected to the upper lid plate 12 of each pump body 10A and 10B. Each of the compressed air / negative pressure supply pipes 21A and 21B is supported by a pedestal 22 fixed on the pair of main connection frames 14, and is switched to an air compressor and a vacuum pump (not shown). A pipe connected through a valve is routed. Each pump main body 10A, 10B is connected to an external discharge pipe 24 having a discharge port (a mud discharge port) 23 in the middle part. Both ends of the external discharge pipe 24 communicate with an internal discharge pipe 70 (FIG. 3) disposed inside each pump body 10A, 10B. The internal discharge pipe 70 will be described in detail later. Moreover, although the upper limit detection rod 25 and the lower limit detection rod 26 are attached to the upper cover plate 12 of each pump body 10A, 10B, these will also be described in detail later.

  The suction device 30 includes a device main body 32 having two suction passages 31 therein, and a pipe joint member 33 integrated with the upper end of the device main body 32 and having a discharge passage in which the two suction passages 31 are gathered. The collection surrounded by the pair of collection plates 34 suspended from both sides of the device main body 32 in the direction crossing the swing direction FF ′ (FIG. 2), and the device main body 32 and the collection plates 34. Front and rear shutters 35 and 36 for opening and closing the front and rear entrances of the path S, and a rotary cutter 37 disposed in the collection path S and supported at both ends by the pair of collection plates 34 so as to be rotatable. And a motor (hydraulic motor) 38 that rotationally drives the rotary cutter 37.

  Here, the front and rear shutters 35, 36 are L-shaped, and the respective bent portions are rotatably supported by the apparatus main body 32 by pins 39. In addition, operation levers 40 project from the centers of the upper ends of the front and rear shutters 35 and 36, respectively, and each operation lever 40 bypasses a pulley 41 attached to the collecting plate 34 and is driven on the ship. Both ends of the operation wire 42 extended from the means (not shown) are connected. Further, a pair of synchronizing levers 43 (FIG. 1) are provided at both ends of the upper ends of the front and rear shutters 35 and 36, and the synchronizing lever 43 is mutually connected between the front and rear shutters 35 and 36. A synchronous wire 44 is stretched between them. The front and rear shutters 35 and 36 are opened and closed in synchronization with the movement of the operation wire 42. For example, when the front shutter 35 is positioned at an open position where the collection path S is opened as shown in FIG. Is positioned at a closed position where the rear shutter 36 closes the collection path S.

  The box 50 is placed between the two pump bodies 10A and 10B and fixed to the sub-connecting frame 15 on the upper surface of the front and rear ends of the box body 51. It consists of two valve boxes 52A and 52B provided in series and connecting pipes 53A and 53B that connect the valve boxes 52A and 52B to the body 11 of the pump bodies 10A and 10B. A suction port 54 (FIG. 3) is provided at the center of the lower surface of the box body 51, and the suction device 30 is connected (directly connected) to the box 50 by fitting the pipe joint member 33 to the suction port 54. Yes.

  As shown in FIG. 3, a suction valve 55 is disposed in each of the valve boxes 52A, 52B constituting the box 50. The intake valve 55 is formed on a ring-shaped valve seat plate 57 superimposed on the upper surface of a ring-shaped base plate 56 fixed to the upper plate of the box body 51, and on the inner peripheral edge on the upper surface side of the valve seat plate 57. It consists of a ball (valve element) 58 that is separated from and seated on a seating surface (slope). A ring stopper 59 for restricting the movement of the ball 58 in the seating direction is also provided in each valve box 52A, 52B.

  In the present embodiment, the valve seat plate 57 has an outer diameter sufficiently larger than the diameter of the valve box 52A (52B), while the valve seat 52A is aligned with the valve seat plate 57 at the open end. A flange 60 is provided. The valve seat plate 57 and the flange 60 of the valve box 52 </ b> A are stacked on each other and placed on the base plate 56, and in this state, are fastened and fixed to the base plate 56 using a plurality of bolts 61. Note that the ring stopper 59 is disposed at an inclination, but this smoothly moves the ball 58 moving obliquely toward the opening of each connection pipe 53A, 53B connected to the side wall of each valve box 52A, 52B. This is to stop it. Further, a guide member 62 is provided on the upper surface of the valve seat plate 57 so as to prevent the ball 58 from inadvertently moving laterally.

  As shown in FIG. 3, the internal discharge pipe 70 disposed inside each pump main body 10A, 10B is fixed to the upper cover plate 12 of each pump main body 10A, 10B, and the upper end portion is connected to the cover plate 12. The main pipe portion 71 is slightly protruded to the outside, and the extension pipe portion 72 is extended from the main pipe portion 71 to the vicinity of the lower cover plate 13. The main pipe portion 71 and the extension pipe portion 72 are integrated by tightening and fixing a joint portion of a flange 73 provided at the lower end of the main pipe portion 71 and a flange 74 provided at the upper end of the extension pipe portion 72 with a plurality of bolts 75. Has been. The lower limit detection rod 26 is inserted to the vicinity of the lower end opening of the extension pipe portion 72, while the upper limit detection rod 25 is inserted to an intermediate portion of the main pipe portion 71.

  In the internal discharge pipe 70 described above, the end of the external discharge pipe 24 is connected to the side wall of the main pipe portion 71, and a discharge valve 76 is disposed between the main pipe portion 71 and the extension pipe portion 72. ing. The discharge valve 76 is attached to and detached from a ring-shaped valve seat plate 77 fixed to the flange 74 of the extension pipe portion 72 and a seat surface (slope) formed on the inner peripheral edge of the upper side of the valve seat plate 77. It consists of a ball (valve element) 78. Further, in the main pipe portion 71, two types of stopper plates 79a and 79b for restricting the movement of the ball 78 in the separating direction are disposed. Among the stopper plates, one stopper plate 79 a is fixed to the inner surface of the main pipe portion 71, and the other stopper plate 79 b is a lid that closes the upper end opening of the main pipe portion 71 extending outside the upper lid plate 14. It is fixed to the plate 71 '. By fixing the other stopper plate 79b to the cover plate 71 ′ in this way, the ball 78 can be extracted to the outside through the main pipe portion 71 by removing the cover plate 71 ′ and extracting the other stopper plate 79b. it can.

The operation of the soot pump device configured as described above will be described below.
In dredging, the pump device is submerged in the water by operating the ladder 17 from the ship, and the bottom of the suction device 30 is immersed in the sediment layer of the water bottom. At this time, the front shutter 35 in the saddle direction (here, the F direction in FIG. 2) is positioned in the open position, and the rear shutter 36 is positioned in the closed position. For example, negative pressure is supplied to one pump body 10A through one compressed air / negative pressure supply pipe 21A, and compressed air is supplied to the other pump body 10B through the other compressed air / negative pressure supply pipe 21B. The ladder 17 is swung while maintaining the state, and the entire pump device is horizontally moved in the saddle direction F. Then, the suction valve 55 in the valve box 52A connected to the pump body 10A on the side to which negative pressure is supplied receives the negative pressure and opens, and the collection path S at the bottom of the suction device 30 according to the swing. The earth and sand continuously taken in (scratched) is sucked into the pump body 10A through the suction passage 31, the box body 51, the valve box 52A and the connection pipe 53A in the suction device 30. Here, when the sediment layer at the bottom of the water is relatively hard, the motor 38 is activated in advance to rotate the rotary cutter 37. As a result, the hard earth and sand layer is dissolved by the rotary cutter 37, and the earth and sand are efficiently sucked up by the pump body 10A. The rotary cutter 37 may be rotated only when it hits the hard layer during the swing.

  As described above, the earth and sand sucked up in the one pump body 10A gradually increases in volume, and finally reaches a level where it comes into contact with the upper limit detection rod 25. Then, a switching valve (not shown) is switched, and the compressed air is negatively supplied to one pump body 10A through one compressed air / negative pressure supply pipe 21A and negatively supplied to the other pump body 10B through the other compressed air / negative pressure supply pipe 21B. Each is supplied with pressure. Then, the suction valve 55 in the valve box 52A connected to the one pump main body 10A is closed, while the discharge valve 76 in the internal discharge pipe 70 is opened, and the earth and sand in the pump main body 10A becomes an extension pipe. It is extruded from the section 72 and the main pipe section 71 to the external discharge pipe 24 and discharged from the discharge port 23 of the external discharge pipe 24 to the outside (for example, a mud tank on a ship). On the other hand, the suction valve 55 in the valve box 52B connected to the pump body 10B to which negative pressure is supplied is opened by receiving the negative pressure, and is thereby taken into the collection passage S at the bottom of the suction device 30. The earth and sand are sucked into the pump body 10B through the suction passage 31, the box body 51, the valve box 52B, and the connection pipe 53B in the suction device 30. In this way, the discharge process of earth and sand is performed on the side of one pump body 10A, and the suction process of earth and sand is performed on the side of the other pump body 10B. These processes are performed according to the detection of earth and sand by the upper limit detection rod 25. And 10B alternately, and earth and sand are continuously discharged from the discharge port 23 of the external discharge pipe 24.

  Therefore, when the water depth of the dredged area is shallow, as shown in FIG. 6, the upper parts of the pump bodies 10A and 10B protrude above the water surface. However, in this embodiment, the box 50 is arranged between the two pump bodies 10A, 10B arranged in parallel, and the suction device 30 is directly connected to the box 50, so that the overall height of the pump body is Is lower than the conventional pump device (FIG. 6) in which the pipe line 3 connecting the pump main body 1 and the suction device 2 is piped from the bottom of the pump main body 1. As a result, the difference between the upper limit liquid level in the pump bodies 10A and 10B and the surrounding water level, the so-called water head difference ΔH, is reduced, and the efficiency of sucking mud into the pump bodies 10A and 10B is improved.

  In this embodiment, in particular, the valve seat plate 57 constituting the intake valve 55 is attached to the base plate 56 of the box body 51 together with the flange 60 of the valve boxes 52A and 52B by bolts 61 outside the valve boxes 52A and 52B. Since the bolts 61 are removed, the valve seat plate 57 can be easily replaced.

  In the above embodiment, the structure is such that two pump bodies 10A, 10B are arranged for one inhaler 30. However, in the present invention, one pump is provided for one inhaler 30. Of course, the main body may be arranged, and in this case, the suction device 30 is directly connected to the other end of the box 50.

  Here, in the above embodiment, the discharge valve 76 has a ball valve structure in which the ball 78 is separated from the valve seat plate 77. The discharge valve 76 is a poppet valve 80 as shown in FIGS. It can be. 4 and 5, the same parts as those shown in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted. The poppet valve 80 includes a ring-shaped valve seat member 81 fixed to the upper peripheral edge of the flange 74 at the upper end of the extension pipe portion 72, and a plate-shaped valve body (separately seated on the upper surface of the valve seat member 81). Assembly) 82. Above the flange 74, a plurality of guide members 83 for guiding the valve body 82 and a plate-like stopper (assembly) 84 for restricting the movement of the valve body 82 in the seating direction are arranged. It is installed.

  More specifically, the valve body 82 constituting the poppet valve 80 is an assembly structure in which a valve body 85 made of an elastic body such as a rubber plate is sandwiched between a back plate 86 and an auxiliary plate 87 and these are fastened by a plurality of bolts 88. It has become. The guide member 83 is disposed on a support plate 90 fixed to the valve seat member 81 using a recess 89 provided on the outer peripheral surface of the valve seat member 81. Here, four guide members 83 are provided at intervals of 90 degrees in the circumferential direction, and the valve body 82 moves in the vertical direction from the valve seat member 81 while being guided by the guide member 83, and the valve body 85. Is in surface contact with the valve seat member 81. On the other hand, the stopper 84 also has an assembled structure in which a plate 91 made of an elastic body such as a rubber plate is sandwiched between a back plate 92 and an auxiliary plate 93 and is fastened by a plurality of bolts 94 in the same manner as the valve body 82. Yes. The stopper 84 is supported by the guide member 83 by press-fitting the guide member 83 into a radial groove 95 (FIG. 4) formed on the outer peripheral side thereof. On the other hand, a claw piece 96 protruding radially inward is provided at the upper end of the guide member 83, and the stopper 84 is restricted from coming off from the guide member 83 by the claw piece 96. Here, the discharge pipe 70 has a structure in which a short seam pipe 99 is interposed between the main pipe portion 71 and the extension pipe portion 72 by using bolts 97 and 98, and the poppet valve 80 has the structure shown in FIG. It is disposed in the joint pipe 99.

  In the poppet valve (discharge valve) 80 configured as described above, the valve body 82 is guided in a fixed posture while being guided by the guide member 83 when being opened in response to the supply of compressed air into the pump body 10A or 10B. When the valve body 82 moves upward and then closes in response to the supply of negative pressure into the pump body 10A or 10B, the valve body 82 smoothly seats on the upper surface of the valve seat member 81. As a result, the discharge valve Operation is stable. When the valve is closed, the valve body 85 made of an elastic body is seated on the valve seat member 81. On the other hand, when the valve is opened, the valve body 82 collides with a stopper 84 on which a plate 91 made of an elastic body is arranged in a sandwich shape. Therefore, the impact at the time of valve closing and valve opening is relieved, and the life of the valve body 82 is greatly extended.

  The suction valve 55 (FIG. 3) disposed in the valve box 52A, 52B of the box 50 may also be a poppet valve similar to the poppet 80 described above, and in this case as well, the suction valve is the same as the discharge valve. The operation of the valve is stable and its life is extended.

1 is a side view showing a part of the entire structure of a bag pump device as an embodiment of the present invention. FIG. 2 is a front view showing a part of the entire structure of the pump device shown in FIG. It is sectional drawing which shows the built-in structure of the pump main body and the box which comprise this pump apparatus. It is a top view which shows other embodiment of the discharge valve used by this invention as a partial cross section. It is sectional drawing which shows the structure of the discharge valve (poppet valve) shown in FIG. It is a schematic diagram which shows the general | schematic structure of a conventional pump apparatus, and the example of malfunction occurrence.

Explanation of symbols

10A, 10B Pump body 11 Body of pump body 14 Main connection frame 17 Ladder 21A, 21B Compressed air / negative pressure supply pipe 24 External discharge pipe 30 Suction device 37 Rotating cutter 50 Box 51 Box body (main body)
52A, 52B Valve box 53A, 53B Connection pipe 55 Suction valve 70 Internal discharge pipe 76 Discharge valve 80 Poppet valve (discharge valve)
81 Valve seat member (valve seat)
82 Valve body 83 Guide member 85 Valve body made of elastic body

Claims (2)

A suction valve is disposed in a pipe line connecting a sealed pump body and a suction device for collecting sediment at the bottom of the water, and a discharge valve is disposed in a discharge pipe extending from the inside of the pump body to the outside. The suction valve and the discharge valve are alternately opened by repeating negative pressure introduction and compressed air introduction into the main body, and the soil is sucked into the pump body from the suction device through the pipe line. In the dredge pump device for discharging the sucked earth and sand to the outside through the discharge pipe, the pipe line is arranged in a box arranged in parallel with the body of the pump main body, and a suction valve is arranged in the main body of the box The valve body is detachably attached to the body, and the box body is connected to the body of the pump body via the valve box, and the suction device is directly connected to the box. Characteristic pump device for dredging. The discharge valve is composed of a poppet valve that separates and seats the valve body on the valve seat, and a guide that guides the valve body and restricts movement of the valve body in the seating direction is disposed in the valve box. The dredge pump device according to claim 1 .

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