A water-acting piston sealing device for the side suction port of a trailing suction dredger

Abstract

The present invention relates to the technical field of dredging engineering machinery, and discloses a water-acting piston sealing device for the side suction port of a trailing suction dredger, comprising a slider body, a water ballast tank, a sealing ring, a gland, a return spring, a water inlet pipe, and a throttle pipe; the water ballast tank is arranged on the side of the slider body facing the hull, the water ballast tank is connected to the high-pressure flushing pipe through the water inlet pipe, the sealing ring is located in the water ballast tank, the top of the sealing ring protrudes toward the hull, an elastic ring is fixed on the protrusion, the gland is fixed to the slider and presses both sides of the sealing ring protrusion, and the return spring is located between the inner side of the gland and the sealing ring. The advantages of the present invention are: the water pressure in the high-pressure flushing pipe is used as power to drive the sealing ring to move, and no additional power is required; the water ballast tank and the sealing ring are used instead of the airbag to extend the service life of the sealing device; the self-lubricating polymer elastic ring on the top of the sealing ring can effectively reduce wear and tear, and can adapt to the relative movement between the slider and the dredger, and maintain a good seal.

Description

Technical Field

[0001] The invention belongs to the technical field of dredging engineering machinery, and in particular relates to a water-acting piston sealing device for a side suction port of a trailing suction dredger. Background Art

[0002] The existing trailing suction dredger is a large self-propelled trailing suction dredger equipped with a trailing head excavation tool and a hydraulic mud suction device. During dredging, the trailing suction pipe is lowered along the ship's side, and the slider installed on the upper end of the trailing suction pipe is moved to the side mud suction pipe port to dock with the hull suction port, and at the same time docked with a high-pressure flushing pipe, which is connected to the trailing head. A group of high-pressure nozzles are set on the trailing head, and the lower end of the trailing suction pipe falls on the river / seabed. During the towing of the ship, the river / seabed is impacted by the trailing head high-pressure nozzle to stir up the mud and sand, and a sealed space is formed inside the trailing head for mud mixing. The vacuum effect of the mud pump in the cabin is used to absorb mud from the river / seabed through the trailing head and the mud suction pipe into the mud bin of the dredger. However, this mud suction method of the mud pump in the cabin has problems such as too long pipelines, the need to set up a high-power mud pump, large equipment investment, high operating costs, and limited mud suction depth.

[0003] To solve the above problems, the current solution is: by placing the mud pump in front of the middle section of the suction pipe, shortening the distance between the mud pump and the drag head, the construction efficiency can be improved and the operating depth of the dredger can be increased. However, new problems have arisen. When the original cabin mud pump was used, the drag suction pipe slider and the hull suction port were always in a negative pressure state, and there was no mud and water leakage problem; but after the mud pump was placed in front of the drag suction pipe, the interface between the drag suction pipe and the mud suction pipe was in a positive pressure state. If there is no good sealing device to seal the interface, mud and water leakage will occur, causing water pollution in the waterway. Since the docking interface is deep underwater and needs to be sealed after docking, the engineering difficulty is high and the control requirements are high. Due to the influence of the assembly gap between the slider and the side suction buckle ring, there is an instantaneous relative movement between the slider and the suction buckle ring at the moment the drag head lands, and when the ship is dragging the drag suction pipe, due to the undulating river / seabed, the hardness of different areas is also inconsistent, and the drag suction pipe swings up and down and left and right when passing, causing relative movement between the slider and the hull suction port. At present, the slider sealing devices designed internationally and domestically are all of the airbag type. This device sets an annular airbag on the slider, inflates the airbag after docking, and seals after the airbag expands. However, it was found in actual use that the airbag is very easy to damage, has a short service life, and is frequently replaced. The main causes of damage are friction damage, improper inflation pressure, and improper installation. Since there is relative movement between the slider and the mud suction port, the inflated airbag will rub; if the inflation pressure of the airbag is too low, it will not play a sealing role. When the pressure is too high, the airbag will fatigue for a long time and shorten its life. Moreover, whether the air pressure is too high or too low, it will accelerate the wear of the airbag; because the airbag is an elastic part and lacks support, when it is installed into the slider, if it is improperly installed, it is very easy for a small part of the airbag to protrude from the slider, so that it will break when launched into the water. At present, many design units and shipyards in the industry are working on this problem, but they have never been able to solve it. Summary of the invention

[0004] In order to overcome the above technical problems, the present invention provides a water-acting piston sealing device for the side suction port of a trailing suction dredger.

[0005] To achieve the above object, the present invention is implemented by the following technical solutions: A water-acting piston sealing device for the side suction port of a trailing suction dredger, comprising a slider body, a water ballast tank, a sealing ring, a gland, a return spring, a water inlet pipe, and a throttle pipe;

[0006] The water ballast tank is an annular groove with a rectangular cross section. A water inlet pipe is provided at the upper end of the bottom of the water ballast tank, and the water inlet pipe is connected to the high-pressure flushing pipe on the slider body. A throttle pipe is provided at the lower end of the bottom of the water ballast tank, and the diameter of the water inlet pipe is larger than the diameter of the throttle pipe. The cross section of the sealing ring is a convex shape. The bottom of the sealing ring is located in the water ballast tank, and the top of the sealing ring is a convex and faces the hull. An elastic ring is fixed on the convex, and the bottom of the sealing ring is adapted to the groove of the water ballast tank.

[0007] The gland is divided into an inner gland and an outer gland, both of which are annular, the inner side of the inner gland and the outer side of the outer gland are connected to the slider body, the outer side of the inner gland presses the inner side of the sealing ring protrusion, and the inner side of the outer gland presses the outer side of the sealing ring protrusion, and the gap between the inner and outer glands matches the width of the sealing ring protrusion;

[0008] An annular water seal chamber is provided inside the inner gland, the outlet of the throttle pipe is connected to the water seal chamber, and the water seal chamber is provided with an annular groove or a plurality of water outlets on the side facing the hull;

[0009] There are multiple groups of return springs evenly distributed along the circumference of the gland, and the number of groups of return springs matches the diameter of the hull mud suction pipe; each group of return springs has two, which are respectively located between the inner side of the inner and outer glands and the bottom of the sealing ring;

[0010] Wear rings are arranged on the friction surfaces between the water ballast chamber and the sealing ring and between the gland and the sealing ring.

[0011] The principle is as follows: after the drag suction pipe slider is docked with the hull suction port, high-pressure water with a pressure of 7 to 18 kg in the high-pressure flushing pipe is introduced into the water ballast tank through the water inlet pipe. The water pressure pushes the sealing ring out, and the elastic ring on the top protrusion of the sealing ring squeezes the mud suction pipe mouth to form a seal. The high-pressure water comes from the drag head high-pressure flushing pipe, which may contain some fine mud and sand. In order to avoid the accumulation of mud and sand in the water ballast tank and possible blockage, a throttle pipe is connected to the inner wall of the water ballast tank. The diameter of the water inlet pipe is larger than the diameter of the throttle pipe. The throttle pipe is connected to the water seal chamber. In this way, while ensuring the formation of positive pressure in the water ballast tank, a water curtain is formed by the annular groove or water outlet of the water seal chamber to prevent mud and water from entering. When the operation is completed, the high-pressure flushing pipe stops passing water, the pressure in the water ballast tank decreases, and the sealing ring returns to the water ballast tank under the action of the return spring to release the seal. The gland serves as both the force point of the return spring and the limiter of the sealing ring. No matter how the water inlet pressure increases, the travel of the sealing ring remains unchanged, reducing the transitional extrusion wear of the elastic ring. The elastic ring has a certain thickness. Even if the suction ring and the slider joint surface are not completely parallel, the elastic ring can be completely sealed by squeezing it, and even if the elastic ring is worn to the limit thickness, it can still maintain a good seal. The wear ring can reduce the wear of the friction surface of the sealing ring and extend its service life.

[0012] Furthermore, there are 2 to 3 throttling pipes, which are evenly distributed at the bottom of the water ballast tank, and the sum of the cross-sectional areas of all throttling pipes is smaller than the cross-sectional area of ​​the water inlet pipe, so as to ensure that the water curtain formed in the water seal chamber is uniform.

[0013] Furthermore, the outer surface of the slider body and the gland are in the same plane, and the extended distance of the sealing ring is greater than the distance between the slider body and the hull sludge suction pipe opening, thereby ensuring the flatness of the slider surface and keeping it smooth during the sliding process.

[0014] Furthermore, two symmetrical stop steps are provided in the water ballast tank, the distance between the edge of the stop step and the bottom of the water ballast tank is greater than the diameter of the water inlet, and the distance between the two stop steps is less than the bottom width of the sealing ring, so as to prevent the sealing ring from blocking the water inlet pipe by reverse movement, and the next time the water inlet pipe cannot flow into the water ballast tank, causing the sealing ring to be unable to move forward.

[0015] Furthermore, an inner frame seal is provided between the inner gland and the protrusion, an inner annular groove is provided on the inner gland, an inner stop baffle is installed in the inner annular groove, and the inner stop baffle is close to the outer side of the inner frame seal; an outer frame seal is provided between the outer gland and the protrusion, an outer annular groove is provided on the outer gland, an outer stop baffle is installed in the outer annular groove, and the outer stop baffle is close to the outer side of the outer frame seal. The inner gland and the protrusion need to withstand the impact of muddy water. The pressure of muddy water is relatively large, and it will definitely rush into the gap between the inner gland and the protrusion, thereby causing an adverse effect on the return spring. Therefore, a frame seal is provided between the inner gland and the protrusion to prevent muddy water from entering. In order to fix the frame seal, an annular groove is provided on the gland, and a stop baffle similar to a retaining spring is installed in the annular groove. Although there is no high-pressure muddy water between the outer gland and the protrusion, there is only the water pressure at the position of the mud suction pipe. In order to protect the disc spring assembly from seawater corrosion, a frame seal is also provided between the outer gland and the protrusion.

[0016] Furthermore, an inner water seal is provided between the inner side of the bottom of the sealing ring and the water ballast tank, and an outer water seal is provided between the outer side of the bottom of the sealing ring and the water ballast tank.

[0017] Furthermore, there are two inner water seals, and an inner distance ring is provided between the two inner water seals; there are two outer water seals, and an outer distance ring is provided between the two outer water seals. Since the sealing rings are driven by hydraulic pressure, effective sealing is very necessary. In order to better seal the water ballast tank, double water seals are used, and in order to make the double water seals work together without interfering with each other, a distance ring is provided between the two water seals.

[0018] Furthermore, the gland has a through hole at the location where the return spring is provided, a step is provided at the bottom of the through hole, a cover is provided at the top of the through hole, and the cover is bolted to the gland; the return spring includes a top pin, a disc spring, and a retaining spring, the top pin is "T" shaped and is divided into a pin rod and a pin seat, the pin rod diameter matches the through hole, the pin seat diameter matches the step, the pin rod passes through the through hole, a retaining spring is provided at the top of the pin rod, the pin seat is close to the sealing ring, and the disc spring is sleeved on the pin rod and is located between the pin seat and the step. Disc springs can withstand extremely large loads in a relatively small space, and compared with springs, the deformation energy per unit volume is larger, and they have good buffering and shock absorption capabilities. The number of return spring groups is related to the diameter of the mud suction pipe mouth. Generally, when the diameter of the mud suction pipe mouth is 500~800mm, 8 groups of return springs are matched, and when the diameter is 900~1200mm, 12 groups of return springs are matched.

[0019] Beneficial effects: Compared with the prior art, the advantages of the present invention are:

[0020] 1) The high-pressure water flow in the upper high-pressure flushing pipe is used as the power to drive the sealing ring to move, without the need for additional power;

[0021] 2) Using water ballast tanks and sealing rings instead of airbags completely avoids the risks of airbag bursting, airbag aging, and airbag being cut and damaged by the side structure, reducing the occurrence rate of failures;

[0022] 3) The self-lubricating polymer elastic ring on the top of the sealing ring can effectively reduce wear and tear, and can adapt to the relative movement and slight tilt between the slider and the suction ring to maintain a good seal;

[0023] 4) The piston stroke is much larger than the gap between the slider and the suction ring, and the elastic ring has a certain thickness, with sufficient compensation margin, which greatly extends the service life of the sealing device;

[0024] 5) The size and number of the throttle holes can not only carry away a small amount of sediment and form a water seal on the sealing surface, but also prevent the water ballast tank from being over-pressured, which may lead to excessive wear of the elastic ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a schematic diagram showing the position of the sealing device in the slider;

[0026] Figure 2 is a schematic diagram of the sealing device when the slider is connected to the mud suction port;

[0027] FIG3 is an enlarged schematic diagram of the upper cross section of the sealing device;

[0028] FIG4 is an enlarged schematic diagram of the lower cross section of the sealing device;

[0029] FIG5 is a partial enlarged schematic diagram of the upper inner gland of the sealing device;

[0030] FIG6 is a partial enlarged schematic diagram of the upper outer gland of the sealing device;

[0031] Among them, 11. slider, 12. upper part of sealing device, 13. lower part of sealing device, 14. high-pressure flushing pipe, 15. water inlet pipe, 16. mud suction pipe, 17. hull, 18. filter screen, 21. water ballast tank, 22. stop step, 23. throttle pipe, 24. water seal chamber, 31. sealing ring, 32. elastic ring, 41. inner pressure cover, 42. outer pressure cover, 43. sealing cover, 51. inner skeleton seal, 52. inner stop baffle, 53. outer skeleton seal, 54. outer stop baffle, 61. inner water seal, 62. outer water seal, 63. inner distance ring, 64. outer distance ring, 71. ejector pin, 72. disc spring, 73. retaining ring, 81. wear ring. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below with reference to examples. The raw materials used in the present invention are all commercially available products.

[0033] Example 1

[0034] A water-acting piston sealing device for the side suction port of a trailing suction dredger comprises a slider 11 body, a water ballast tank 21, a sealing ring, a gland, a return spring, a water inlet pipe 15, and a throttle pipe 23.

[0035] The water ballast tank 21 is an annular groove with a rectangular cross section, which is arranged on the side of the slider 11 body facing the hull 17. The opening direction of the annular groove faces the hull 17, and its diameter matches the port of the sludge suction pipe 16 of the hull 17. A water inlet pipe 15 is arranged at the upper end of the bottom of the water ballast tank 21, and the water inlet pipe 15 is connected to the high-pressure flushing pipe 14 on the slider 11 body. Two throttle pipes 23 are evenly arranged at the lower end of the bottom of the water ballast tank 21. The diameter of the water inlet pipe 15 is 25mm, and the diameter of the throttle pipe 23 is 6mm. The outlet of the throttle pipe 23 is connected to the water seal chamber 24. The water seal chamber is arranged on the inner side of the inner pressure cover in an annular shape. The water seal chamber has an annular groove on the side facing the hull, and the groove width is 2mm. Or several water outlets.

[0036] The sealing ring 31 is annular, with a wide bottom and a convex top, forming a "convex" shape; the bottom of the sealing ring 31 is located in the water ballast tank 21, and the top of the sealing ring 31 convexly faces the hull 17. An elastic ring 32 made of ultra-high molecular weight polyethylene is fixed on the convex, and the inner diameter, outer diameter and thickness of the bottom of the sealing ring 31 are matched with the groove of the water ballast tank 21; two symmetrical stop steps 22 are arranged in the water ballast tank 21, and the distance between the edge of the stop step 22 and the bottom of the water ballast tank 21 is greater than the diameter of the water inlet pipe 15, and the distance between the two stop steps 22 is less than the bottom width of the sealing ring 31. Due to the irregular shaking of the rake suction pipe, the elastic ring 32 and the mouth of the sludge suction pipe 16 are in a slight sliding friction, and the wear of the elastic ring 32 is very serious. Therefore, the elastic ring 32 made of ultra-high molecular weight polyethylene that can self-lubricate greatly reduces the degree of wear and prolongs the maintenance cycle. The elastic ring 32 has a certain thickness and sufficient compensation margin, so that the sealing can be maintained even with a small amount of wear.

[0037] The gland is divided into an inner gland 41 and an outer gland 42. Both the inner and outer glands 42 are annular. The inner side of the inner gland 41 and the outer side of the outer gland 42 are connected to the slider 11 body. The outer side of the inner gland 41 presses the inner side of the raised portion of the sealing ring 31, and the inner side of the outer gland 42 presses the outer side of the raised portion of the sealing ring 31. The gap between the inner and outer glands 42 matches the raised width of the sealing ring 31.

[0038] There are multiple groups of return springs evenly distributed along the circumference of the gland, and the number of return spring groups matches the diameter of the hull 17 mud suction pipe 16; each group of return springs has two, which are respectively located between the inner side of the inner and outer glands 42 and the bottom of the sealing ring 31.

[0039] Wear rings 81 are provided on the friction surfaces between the water ballast chamber 21 and the sealing ring 31 and between the gland and the sealing ring 31 .

[0040] The outer surface of the slider 11 body and the gland are in the same plane, and the extended distance of the sealing ring 31 is greater than the distance between the slider 11 body and the mud suction pipe 16 opening of the hull 17 .

[0041] Example 2

[0042] A water-acting piston sealing device for a side suction port of a trailing suction dredger comprises a slider 11 body, a water ballast tank 21, a sealing ring 31, a gland, a return spring, a water inlet pipe 15, and a throttle pipe 23.

[0043] The water ballast tank 21 is an annular groove with a rectangular cross section, which is arranged on the side of the slider 11 body facing the hull 17. The opening direction of the annular groove faces the hull 17, and its diameter matches the mouth of the sludge suction pipe 16 of the hull 17. A water inlet pipe 15 is provided at the upper end of the bottom of the water ballast tank 21, and the water inlet pipe 15 is connected to the high-pressure flushing pipe 14 on the slider 11 body. Two throttle pipes 23 are evenly arranged at the lower end of the bottom of the water ballast tank 21. The diameter of the water inlet pipe 15 is 25mm, the diameter of the throttle pipe 23 is 5mm, and the outlet of the throttle pipe 23 is connected to the water seal chamber 24. The water seal chamber is arranged on the inner side of the inner pressure cover in an annular shape. The water seal chamber is provided with a plurality of water outlets distributed along the circumference of the inner pressure cover on the side facing the hull. The center distance between two adjacent water outlets is 20mm, and the diameter of the water outlet is 2mm.

[0044] The sealing ring 31 is annular, with a wider bottom and a convex top in the cross section, forming a "convex" shape; the bottom of the sealing ring 31 is located in the water ballast tank 21, and the top of the sealing ring 31 convexly faces the hull 17, and an elastic ring 32 made of polytetrafluoroethylene is fixed on the convex, and the inner diameter, outer diameter and thickness of the bottom of the sealing ring 31 are adapted to the groove of the water ballast tank 21; two symmetrical stop steps 22 are arranged in the water ballast tank 21, and the distance between the edge of the stop step 22 and the bottom of the water ballast tank 21 is greater than the diameter of the water inlet pipe 15, and the distance between the two stop steps 22 is less than the bottom width of the sealing ring 31.

[0045] The gland is divided into an inner gland 41 and an outer gland 42. Both the inner and outer glands 42 are in the shape of a circular ring. The inner side of the inner gland 41 and the outer side of the outer gland 42 are connected to the body of the slider 11. The outer side of the inner gland 41 presses the inner side of the protrusion of the sealing ring 31, and the inner side of the outer gland 42 presses the outer side of the protrusion of the sealing ring 31. The gap between the inner and outer glands 42 matches the width of the protrusion of the sealing ring 31; an inner skeleton seal 51 is provided between the inner gland 41 and the protrusions, an inner annular groove is provided on the inner gland 41, an inner stop baffle 52 is installed in the inner annular groove, and the inner stop baffle 52 is closely attached to the outer side of the inner skeleton seal 51; an outer skeleton seal 53 is provided between the outer gland 42 and the protrusions, an outer annular groove is provided on the outer gland 42, an outer stop baffle 54 is installed in the outer annular groove, and the outer stop baffle 54 is closely attached to the outer side of the outer skeleton seal 53.

[0046] There are multiple groups of return springs evenly distributed along the circumference of the gland, and the number of return spring groups matches the diameter of the hull 17 mud suction pipe 16; each group of return springs has two, which are respectively located between the inner side of the inner and outer glands 42 and the bottom of the sealing ring 31.

[0047] Wear rings 81 are provided on the friction surfaces between the water ballast chamber 21 and the sealing ring 31 and between the gland and the sealing ring 31 .

[0048] The outer surface of the slider 11 body and the gland are in the same plane, and the extended distance of the sealing ring 31 is greater than the distance between the slider 11 body and the mud suction pipe 16 opening of the hull 17 .

[0049] Example 3

[0050] like Figures 1 to 6 As shown, a water-acting piston sealing device for the side suction port of a trailing suction dredger comprises a slider 11 body, a water ballast tank 21, a sealing ring 31, a gland, a return spring, a water inlet pipe 15, and a throttle pipe 23.

[0051] The water ballast tank 21 is an annular groove with a rectangular cross section, which is arranged on the side of the slider 11 body facing the hull 17. The opening direction of the annular groove faces the hull 17, and its diameter matches the port of the sludge suction pipe 16 of the hull 17. A water inlet pipe 15 is arranged at the upper end of the bottom of the water ballast tank 21. The water inlet pipe 15 is connected to the high-pressure flushing pipe 14 on the slider 11 body. A filter screen 18 made of stainless steel is arranged at the connection. Two throttle pipes 23 are evenly arranged at the lower end of the bottom of the water ballast tank 21. The diameter of the water inlet pipe 15 is 25mm, and the diameter of the throttle pipe 23 is 6mm. The outlet of the throttle pipe 23 is connected to the water seal chamber 24. The water seal chamber is arranged on the inner side of the inner pressure cover in an annular shape. The water seal chamber has an annular groove on the side facing the hull, and the groove width is 2mm. Or several water outlets.

[0052] The sealing ring 31 is annular, with a wider bottom and a convex top, forming a "convex" shape; the bottom of the sealing ring 31 is located in the water ballast tank 21, and the top of the sealing ring 31 convexly faces the hull 17. An elastic ring 32 made of nylon is fixed on the convex, and the inner diameter, outer diameter and thickness of the bottom of the sealing ring 31 are matched with the groove of the water ballast tank 21; two symmetrical stop steps 22 are provided in the water ballast tank 21, and the distance between the edge of the stop step 22 and the bottom of the water ballast tank 21 is greater than the diameter of the water inlet pipe 15, and the distance between the two stop steps 22 is less than the width of the bottom of the sealing ring 31. An inner water seal 61 is provided between the inner side of the bottom of the sealing ring 31 and the water ballast tank 21, and an outer water seal 62 is provided between the outer side of the bottom of the sealing ring 31 and the water ballast tank 21. There are two inner water seals 61 , and an inner distance ring 63 is provided between the two inner water seals 61 ; there are two outer water seals 62 , and an outer distance ring 64 is provided between the two outer water seals 62 .

[0053] The gland is divided into an inner gland 41 and an outer gland 42. Both the inner and outer glands 42 are annular. The inner side of the inner gland 41 and the outer side of the outer gland 42 are connected to the body of the slider 11. The outer side of the inner gland 41 presses the inner side of the protrusion of the sealing ring 31, and the inner side of the outer gland 42 presses the outer side of the protrusion of the sealing ring 31. The gap between the inner and outer glands 42 matches the width of the protrusion of the sealing ring 31. An inner skeleton seal 51 is provided between the inner gland 41 and the protrusion of the sealing ring 31. An inner annular groove is provided on the inner gland 41. An inner stop baffle 52 is installed in the inner annular groove. The inner stop baffle 52 is close to the outer side of the inner skeleton seal 51. An outer skeleton seal 53 is provided between the outer gland 42 and the protrusion of the sealing ring 31. An outer annular groove is provided on the outer gland 42. An outer stop baffle 54 is installed in the outer annular groove. The outer stop baffle 54 is close to the outer skeleton seal 53. Outside.

[0054] There are multiple groups of return springs evenly distributed along the circumference of the gland, and the number of return spring groups matches the diameter of the hull 17 mud suction pipe 16; each group of return springs has two, which are respectively located between the inner side of the inner and outer glands 42 and the bottom of the sealing ring 31. The gland is provided with a through hole at the position where the return spring is provided, a step is provided at the bottom of the through hole, and a cover 43 is provided at the top of the through hole, and the cover 43 is bolted to the gland; the return spring includes a top pin 71, a disc spring 72, and a retaining spring 73. The top pin 71 is "T" shaped and is divided into a pin rod and a pin seat. The diameter of the pin rod matches the through hole, and the diameter of the pin seat matches the step. The pin rod passes through the through hole, and a retaining spring 73 is provided on the top of the pin rod. The pin seat is close to the sealing ring 31, and the four disc springs 72 are mounted on the pin rod in a face-to-face installation manner and are located between the pin seat and the step.

[0055] Wear rings 81 are provided on the friction surfaces between the water ballast chamber 21 and the sealing ring 31 and between the gland and the sealing ring 31 .

[0056] The outer surface of the slider 11 body and the gland are in the same plane, and the extended distance of the sealing ring 31 is greater than the distance between the slider 11 body and the mud suction pipe 16 opening of the hull 17 .

[0057] The present invention has been described according to the above embodiments. It should be understood that the above embodiments do not limit the present invention in any form. Any technical solutions obtained by equivalent replacement or equivalent transformation shall fall within the protection scope of the present invention.

Claims

1. A water-acting piston sealing device for the side suction port of a trailing suction dredger, characterized in that: It includes a slider body, a water ballast tank, a sealing ring, a gland, a return spring, a water inlet pipe, and a throttle pipe; The water ballast tank is an annular groove with a rectangular cross section. A water inlet pipe is provided at the upper end of the bottom of the water ballast tank. The water inlet pipe is connected to the high-pressure flushing pipe on the slider body. A throttle pipe is provided at the lower end of the bottom of the water ballast tank. The diameter of the water inlet pipe is larger than the diameter of the throttle pipe. The cross section of the sealing ring is in a convex shape; the bottom of the sealing ring is located in the water ballast tank, the top of the sealing ring is a convex and faces the hull, an elastic ring is fixed on the convex, and the bottom of the sealing ring is adapted to the groove of the water ballast tank; The gland is divided into an inner gland and an outer gland, both of which are annular, the inner side of the inner gland and the outer side of the outer gland are connected to the slider body, the outer side of the inner gland presses the inner side of the sealing ring protrusion, and the inner side of the outer gland presses the outer side of the sealing ring protrusion, and the gap between the inner and outer glands matches the width of the sealing ring protrusion; An annular water seal chamber is provided inside the inner gland, the outlet of the throttle pipe is connected to the water seal chamber, and the water seal chamber is provided with an annular groove or a plurality of water outlets on the side facing the hull; There are multiple groups of return springs evenly distributed along the circumference of the gland, and the number of groups of return springs matches the diameter of the hull mud suction pipe; each group of return springs has two, which are respectively located between the inner side of the inner and outer glands and the bottom of the sealing ring; Wear rings are arranged on the friction surfaces between the water ballast chamber and the sealing ring and between the gland and the sealing ring.

2. The water-acting piston sealing device for the side suction port of a trailing suction dredger according to claim 1, characterized in that: There are 2 to 3 throttling pipes, which are evenly distributed at the bottom of the water ballast tank, and the sum of the cross-sectional areas of all the throttling pipes is smaller than the cross-sectional area of ​​the water inlet pipe.

3. The water-acting piston sealing device for the side suction port of a trailing suction dredger according to claim 1, characterized in that: Two symmetrical stop steps are arranged in the water ballast chamber, the distance between the edge of the stop step and the bottom of the water ballast chamber is greater than the diameter of the water inlet pipe, and the distance between the two stop steps is less than the bottom width of the sealing ring.

4. The water-acting piston sealing device for the side suction port of a trailing suction dredger according to claim 1, characterized in that: An inner skeleton seal is provided between the inner pressure cover and the sealing ring protrusion, an inner annular groove is provided on the inner pressure cover, an inner stop baffle is installed in the inner annular groove, and the inner stop baffle is tightly against the outer side of the inner skeleton seal; an outer skeleton seal is provided between the outer pressure cover and the sealing ring protrusion, an outer annular groove is provided on the outer pressure cover, an outer stop baffle is installed in the outer annular groove, and the outer stop baffle is tightly against the outer side of the outer skeleton seal.

5. The water-acting piston sealing device for the side suction port of a trailing suction dredger according to claim 1, characterized in that: An inner water seal is provided between the inner side of the bottom of the sealing ring and the water ballast tank, and an outer water seal is provided between the outer side of the bottom of the sealing ring and the water ballast tank.

6. The water-acting piston sealing device for the side suction port of a trailing suction dredger according to claim 5, characterized in that: There are two inner water seals, and an inner distance ring is arranged between the two inner water seals; there are two outer water seals, and an outer distance ring is arranged between the two outer water seals.

7. The water-acting piston sealing device for the side suction port of a trailing suction dredger according to claim 1, characterized in that: The gland is provided with a through hole at the location where the return spring is provided, a step is provided at the bottom of the through hole, a sealing cover is provided at the top of the through hole, and the sealing cover is bolted to the gland; the return spring comprises a top pin, a disc spring, and a retaining spring, the top pin is in a "T" shape, and is divided into a pin rod and a pin seat; the diameter of the pin rod matches the through hole, the diameter of the pin seat matches the step, the pin rod passes through the through hole, a retaining spring is provided at the top of the pin rod, the pin seat is tightly against the sealing ring, and four disc springs are mounted on the pin rod in a face-to-face manner and are located between the pin seat and the step.

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