WO2021134991A1

WO2021134991A1 - Water acting piston-type sealing device for side suction port of trailing suction hopper dredger

Info

Publication number: WO2021134991A1
Application number: PCT/CN2020/086381
Authority: WO
Inventors: 彭陵生; 殷宝峰; 鄢栋梁; 徐雪鸿; 芦安平; 杨涛; 倪嘉伟; 芮迪文; 李小波; 张海波; 毕宗兵; 李二伟; 田道森; 朱文博; 王坤; 邵新; 余学渊; 李柯华; 孙超; 王雯婷
Original assignee: 长江南京航道工程局
Priority date: 2019-12-30
Filing date: 2020-04-23
Publication date: 2021-07-08
Also published as: CN111120739A

Abstract

A water acting piston-type sealing device for a side suction port of a trailing suction hopper dredger, comprising a slider (11) body, a water pressure chamber (21), a sealing ring (31), a gland, a return spring, a water inlet pipe (15), and a throttle pipe (23); the water pressure chamber (21) is provided on the side of the slider (11) body facing a hull (17); the water pressure chamber (21) is connected to a high-pressure flush pipe (14) by means of the water inlet pipe (15); the sealing ring (31) is located in the water pressure chamber (21), and a protrusion at the top of the sealing ring (31) faces the hull (17); and an elastic ring (32) is fixed on the protrusion, the gland is fixed to a slider (11) and presses two sides of the protrusion of the sealing ring (31), and the return spring is located between the inner side of the gland and the sealing ring (31). The water pressure in the high-pressure flush pipe (14) is used as the power to drive the sealing ring (31) to move without additional power; the water pressure chamber (21) and the seal ring (31) are used to replace an air bag, and the service life of the sealing device is prolonged; and the polymer elastic ring (32) at the top of the sealing ring (31) can be used for effectively reducing friction and can adapt to the relative movement between the slider (11) and a suction port, and a good seal is maintained.

Description

Piston type sealing device for sucking water on side of trailing suction dredger

Technical field

The invention belongs to the technical field of dredging engineering machinery, and in particular relates to a piston type sealing device for sucking water on the side of a trailing suction dredger.

Background technique

The existing trailing suction dredger is a large self-propelled trailing suction dredger equipped with drag head excavators and hydraulic suction devices. When dredging, move the trailing suction pipe along the side of the ship, and move the sliding block installed on the upper end of the trailing suction pipe to the side of the suction pipe to connect with the suction port of the hull, and at the same time, a high-pressure flushing pipe is connected. The drag head is equipped with a set of high-pressure nozzles, and the lower end of the raking suction pipe falls on the river/sea bed. During the towing of the ship, the high-pressure nozzles of the drag head impact the river/sea bed to stir up the sand and form a sealed space inside the drag head. The mud is mixed, using the vacuum effect of the mud pump in the cabin to absorb the mud from the river/seabed through the drag head and the mud suction pipe into the mud bunker of the dredger. However, this kind of mud suction method of the mud pump in the cabin has problems such as excessively long pipelines, high-power mud pumps, large equipment investment, high operating costs, and limited suction depth.

In order to solve the above problems, the current plan is to shorten the distance between the mud pump and the drag head by placing the mud pump in the middle of the trailing suction pipe, which can improve the construction efficiency and increase the working depth of the dredger. But then came new problems. When the mud pump in the cabin is used, the negative pressure between the trailing suction pipe slider and the suction port of the hull is always in a negative pressure state, and there is no problem of mud water leakage; but after the mud pump is placed in front of the trailing suction pipe, the interface between the trailing suction pipe and the suction pipe is at In a positive pressure state, if there is no good sealing device to seal the interface, a muddy water leakage problem will occur, which will cause water pollution in the channel. Since the interface is deep underwater and needs to be sealed after docking, the engineering is difficult and the control requirements are high. Due to the impact of the assembly gap between the slider and the side suction buckle, the moment the drag head hits the ground, there is an instant relative movement between the slider and the suction buckle, and when the ship is dragging the rake suction pipe, the river/seabed fluctuates. The degree of softness and hardness of different areas are also inconsistent. When the trailing straw passes by, there is a swing in the up and down and left and right directions, which makes the sliding block and the hull suction port move relative to each other. At present, the slider sealing devices designed both internationally and domestically are of airbag type. The device is equipped with an annular airbag on the slider, and the airbag is inflated after docking, and the airbag is inflated and sealed. However, it was found in actual use that the airbag is extremely 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. Due to the relative movement between the slider and the mud suction port, it will rub against the inflated airbag; if the airbag inflation pressure is too small, the airbag will not have a sealing effect. If the pressure is too high, the airbag will be fatigued for a long time and shorten the life span, regardless of excessive air pressure. If it is too small, it will accelerate the wear of the airbag; because the airbag is an elastic part and lacks support, when it is installed in the slider, if it is installed improperly, it is easy to cause a small part of the airbag to protrude from the slider, which will cause damage when it is launched into the water. At present, many design units and shipyards in the industry are dealing with the issue of public relations, which has not been resolved.

Summary of the invention

In order to overcome the above technical problems, the present invention provides a trailing suction dredger's side suction water piston type sealing device.

In order to achieve the above objective, the present invention is achieved through the following technical solutions.

A trailing suction dredger's side-side suction-action piston type sealing device, which includes a slider body, a water pressure chamber, 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, and the water inlet pipe is connected with a high-pressure flushing pipe on the slider body, and a throttle pipe is provided at the lower end of the water ballast tank bottom. The diameter of the inlet pipe is greater than the diameter of the throttle pipe;

The cross section of the sealing ring is convex; the bottom of the sealing ring is located in the water pressure tank, the top of the sealing ring is convex and facing the hull, and an elastic ring is fixed on the protrusion, and the bottom of the sealing ring is matched with the groove of the water pressure tank ；

The gland is divided into an inner gland and an outer gland. The inner and outer glands are both circular, the inner side of the inner gland and the outer side of the outer gland are both connected to the slider body, and the outer side of the inner gland presses the sealing ring convex The inner part of the outer gland presses the outer part of the sealing ring protrusion, and the gap between the inner and outer glands matches the width of the sealing ring protrusion;

The inner side of the inner gland is provided with an annular water seal chamber, the outlet of the throttle tube is connected with the water seal chamber, and the water seal chamber is provided with an annular groove or several water outlets on the side facing the hull;

There are multiple groups of the return springs evenly distributed along the circumference of the gland, and the number of groups of the return springs matches the diameter of the suction nozzle of the hull; there are two return springs in each group, which are located on the inner side of the inner and outer glands respectively. Between the bottom of the sealing ring;

Wear-bearing rings are provided on the friction surfaces between the water ballast chamber and the sealing ring, and between the gland and the sealing ring.

The principle is: after the trailing straw slider is docked with the suction port of the hull, the high-pressure water with a pressure of 7-18 kg in the high-pressure flushing pipe is introduced into the water pressure tank through the inlet pipe, and the water pressure pushes the sealing ring out, and the sealing ring The elastic ring on the top protrusion squeezes the mouth of the mud suction pipe to form a seal. The high-pressure water comes from the high-pressure flushing pipe of the drag head, which may contain some fine sand. In order to avoid the accumulation of sand in the water ballast tank and possible blockage, a throttle pipe is connected to the inner wall of the water ballast tank, and the diameter of the inlet pipe is larger than the throttle The diameter of the tube, the throttle tube is connected with the water seal chamber, so that 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 water from entering. When the operation is over, 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 is used as the force point of the return spring and the stopper of the sealing ring. No matter how the water inlet pressure increases, the stroke 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 abutting surface of the suction buckle ring and the slider is not completely parallel, a complete seal can be achieved by squeezing the elastic ring, and even if the elastic ring is worn to the limit thickness, it can still maintain a good seal. The wear-bearing ring can reduce the wear of the friction surface of the seal ring and prolong the service life.

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 area of all throttling pipes is smaller than the cross-sectional area of the water inlet pipe. Ensure that the water curtain formed by the water seal chamber is uniform.

Further, the slider body and the outer surface of the gland are in the same plane, and the extending distance of the sealing ring is greater than the distance between the slider body and the mud suction nozzle of the ship hull. Ensure the smoothness of the surface of the slider and keep it smooth during the sliding process.

Further, there are two symmetric stop steps 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 width of the bottom of the seal ring. Avoid the reverse movement of the sealing ring to block the water inlet pipe, and the next time the water from the water inlet pipe cannot pass into the water ballast tank, the sealing ring cannot move forward.

Further, an inner frame seal is provided between the inner pressure cover and the protrusions, an inner annular groove is provided on the inner pressure cover, an inner stop baffle is installed in the inner ring groove, and the inner stop baffle is close to the inner frame The outer side of the seal; an outer frame seal is provided between the outer gland and the protrusions, an outer annular groove is provided on the outer gland, and an outer stop baffle is installed in the outer annular groove, and the outer stop baffle is close to the outside The frame seals the outside. The muddy water needs to withstand the impact between the inner gland and the protrusion. The muddy water has a high pressure and must rush into the gap between the inner gland and the protrusion, which will adversely affect the return spring. Therefore, a skeleton seal is arranged between the inner gland and the protrusion to prevent muddy water from entering, and to fix the skeleton seal, an annular groove is arranged on the gland, and a stop baffle similar to a circlip is installed in the annular groove. Although there is no high-pressure muddy water between the outer gland and the protrusion, only the water pressure at the location of the mud suction pipe. In order to protect the disc spring assembly from seawater corrosion, a skeleton seal is also set between the outer gland and the protrusion.

Furthermore, an inner water seal is provided between the inner side of the bottom of the sealing ring and the water pressure cabin, and an outer water seal is provided between the outer side of the bottom of the seal ring and the water pressure cabin.

Further, 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. Since the sealing ring is driven by hydraulic pressure, effective sealing is very necessary. In view of the fact that in order to better seal the water pressure tank, double water seals are used, and in order to prevent the double water seals from interfering with each other, a distance ring is arranged between the two water seals.

Further, the pressure cover is provided with a through hole at the place where the return spring is provided, the bottom of the through hole is provided with a step, the top of the through hole is provided with a cover, and the cover is connected with the pressure cover by bolts; the return spring includes a top pin, Disc spring, circlip, the top pin is "T" shaped and divided into a pin and a pin seat, the diameter of the pin matches the through hole, the diameter of the pin seat matches the step, the pin passes through the through hole, and the top of the pin is provided with a circlip , The pin seat is close to the sealing ring, and the disc spring is sleeved on the pin rod and located between the pin seat and the step. Disc springs can withstand extremely large loads in a small space. Compared with springs, the deformation per unit volume is larger, and it has good cushioning and shock absorption capabilities. The number of return springs is related to the diameter of the suction nozzle. Generally, when the diameter of the suction nozzle is 500～800mm, it is matched with 8 groups of return springs, and when the diameter is 900～1200mm, it is matched with 12 groups of return springs.

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

1) The high-pressure water flow in the upper high-pressure flushing pipe is used as the driving force to drive the seal ring to move, without additional power;

2) The use of water ballast and sealing ring instead of airbags completely avoids the risk of airbag bursting, airbag aging, and airbag being cut and damaged by the side structure, and reduces the incidence of failure;

3) The self-lubricating polymer elastic ring on the top of the seal ring can effectively reduce the 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;

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

5) The size and quantity of the orifice can not only take away a small amount of sand and sand, but also form a water seal on the sealing surface, but can also avoid excessive pressure in the water ballast tank, resulting in excessive wear of the elastic ring.

Description of the drawings

Figure 1 is a schematic diagram of the position of the sealing device in the slider;

Figure 2 is a schematic diagram of the sealing device when the slider is docked with the mud suction port;

Figure 3 is an enlarged schematic view of the upper part of the cross section of the sealing device;

Figure 4 is an enlarged schematic view of the lower part of the cross section of the sealing device;

Figure 5 is a partial enlarged schematic view of the inner gland of the upper part of the sealing device;

Figure 6 is a partial enlarged schematic view of the outer gland of the upper part of the sealing device;

Among them, 11. Slider, 12. Upper part of the sealing device, 13. Lower part of the sealing device, 14. High pressure flushing pipe, 15. Water inlet pipe, 16. Mud suction pipe, 17. Hull, 18. Filter net, 21. Water ballast, 22. Stop step, 23. Throttle tube, 24. Water seal chamber, 31. Seal ring, 32. Elastic ring, 41. Inner gland, 42. Outer gland, 43. Seal, 51. Inner frame seal , 52. inner stop baffle, 53. outer frame seal, 54. outer stop baffle, 61. inner water seal, 62. outer water seal, 63. inner distance ring, 64. outer distance ring, 71. Top pin, 72. Disc spring, 73. Circlip, 81. Bearing ring.

Detailed ways

The present invention will be further described in detail below in conjunction with examples. The raw materials used in the present invention are all commercially available products.

Example 1

A trailing suction dredger's side-side suction-action piston type sealing device includes a slider 11 body, a water ballast chamber 21, a sealing ring, a gland, a return spring, a water inlet pipe 15, and a throttle pipe 23.

The water ballast tank 21 is an annular groove with a rectangular cross section. It is arranged on the side of the slider 11 facing the hull 17. The opening direction of the annular groove faces the hull 17, and its diameter matches the suction pipe 16 of the hull 17. A water inlet pipe 15 is provided at the upper end of the bottom of the ballast chamber 21. The inlet pipe 15 is connected to the high-pressure flushing pipe 14 on the body of the slider 11. At the bottom of the water ballast chamber 21, two throttle pipes 23 are evenly arranged. The inlet pipe 15 has a diameter of 25mm, The diameter of the throttle tube 23 is 6mm, and the outlet of the throttle tube 23 is connected with the water seal chamber 24. The water seal chamber is arranged inside the inner gland and has a ring shape. The water seal chamber has an annular groove on the side facing the hull, and the slot width is 2 mm. Or several water outlets.

The sealing ring 31 is ring-shaped, with a wide cross-section at the bottom and protrusions on the top, forming a "convex" shape; the bottom of the sealing ring 31 is located in the water ballast chamber 21, and the top of the sealing ring 31 is protruding toward the hull 17, and is fixed on the protrusion. The elastic ring 32 is made of ultra-high molecular weight polyethylene. The inner diameter, outer diameter and thickness of the bottom of the sealing ring 31 are adapted to the groove of the water ballast chamber 21; there are two symmetrical stop steps 22 in the water ballast chamber 21 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. Due to the irregular shaking of the raking suction pipe, the elastic ring 32 and the mouth of the suction pipe 16 are in slight sliding friction, and the abrasion of the elastic ring 32 is very serious. Therefore, the elastic ring 32 made of self-lubricating ultra-high molecular weight polyethylene is used. The degree of wear is greatly reduced, and the maintenance cycle is prolonged. The elastic ring 32 has a certain thickness, and the compensation margin is sufficient, and the seal can be maintained even with a small amount of wear.

The gland is divided into an inner gland 41 and an outer gland 42. The inner and outer glands 42 are both circular rings. The inner side of the inner gland 41 and the outer side of the outer gland 42 are both connected to the body of the slider 11, and the outer side of the inner gland 41 Press the inner part of the protrusion of the seal ring 31, the inner side of the outer gland 42 presses the outer part of the protrusion of the seal ring 31, and the gap between the inner and outer gland 42 matches the width of the protrusion of the seal ring 31;

There are multiple sets of return springs evenly distributed along the circumference of the gland. The number of return springs matches the diameter of the 16 port of the suction pipe of the hull 17; there are two return springs in each group, which are located inside the inner and outer glands 42 and seals. Between the bottom of the ring 31.

A wear-bearing ring 81 is provided on the friction surfaces of the water ballast chamber 21 and the sealing ring 31 and the gland and the sealing ring 31.

The body of the slider 11 and the outer surface of the gland are in the same plane, and the extending distance of the sealing ring 31 is greater than the distance between the body of the slider 11 and the mouth of the suction pipe 16 of the hull 17.

Example 2

A trailing suction dredger's side-side suction suction piston type sealing device includes a slider 11 body, a water ballast chamber 21, a sealing ring 31, a gland, a return spring, a water inlet pipe 15, and a throttle pipe 23.

The water ballast tank 21 is an annular groove with a rectangular cross section. It is arranged on the side of the slider 11 facing the hull 17. The opening direction of the annular groove faces the hull 17, and its diameter matches the suction pipe 16 of the hull 17. There is a water inlet pipe 15 at the upper end of the bottom of the ballast tank 21, which is connected to the high-pressure flushing pipe 14 on the body of the slider 11, and two throttle pipes 23 are evenly arranged at the lower end of the bottom of the water ballast tank 21. The diameter of the inlet pipe 15 is 25mm. , The throttle tube 23 has a diameter of 5mm, and the outlet of the throttle tube 23 is connected to the water seal chamber 24. The water seal chamber is arranged inside the inner gland in a ring shape, and the water seal chamber is opened on the side facing the hull along the circumference of the inner gland. Several water outlets, the center distance of two adjacent water outlets is 20mm, and the diameter of the water outlet is 2mm.

The sealing ring 31 is ring-shaped, with a wide cross-section at the bottom and protrusions on the top, forming a "convex" shape; the bottom of the sealing ring 31 is located in the water ballast chamber 21, and the top of the sealing ring 31 is protruding toward the hull 17, and is fixed on the protrusion. The elastic ring 32 is made of polytetrafluoroethylene. The inner diameter, outer diameter and thickness of the bottom of the sealing ring 31 are adapted to the groove of the water ballast chamber 21; the water ballast chamber 21 is provided with two symmetrical stop steps 22, 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 inlet pipe 15, and the distance between the two stop steps 22 is less than the width of the bottom of the seal ring 31.

The gland is divided into an inner gland 41 and an outer gland 42. The inner and outer glands 42 are both circular rings. The inner side of the inner gland 41 and the outer side of the outer gland 42 are both connected to the body of the slider 11, and the outer side of the inner gland 41 Press the inner part of the protrusion of the sealing ring 31, the inner side of the outer gland 42 presses the outer part of the protrusion of the seal ring 31, and the gap between the inner and outer gland 42 matches the width of the protrusion of the seal ring 31; the inner gland 41 is provided with an inner frame seal 51 between the protrusions, an inner ring groove is provided on the inner pressure cover 41, an inner stop baffle 52 is installed in the inner ring groove, and the inner stop baffle 52 is close to the outer side of the inner frame seal 51 The outer frame seal 53 is provided between the outer gland 42 and the protrusions, the outer gland 42 is provided with an outer annular groove, and the outer stop baffle 54 is installed in the outer annular groove, and the outer stop baffle 54 is close to the outer The frame seal 53 outside.

A wear-bearing ring 81 is provided on the friction surfaces of the water ballast chamber 21 and the sealing ring 31 and the gland and the sealing ring 31. The body of the slider 11 and the outer surface of the gland are in the same plane, and the extending distance of the sealing ring 31 is greater than the distance between the body of the slider 11 and the mouth of the suction pipe 16 of the hull 17.

Example 3

As shown in Figures 1 to 6, a trailing suction dredger's side suction water-acting piston type sealing device includes a slider 11 body, a water ballast chamber 21, a sealing ring 31, a gland, a return spring, and a water inlet pipe 15 , Throttle 23.

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

The sealing ring 31 is ring-shaped, with a wide cross-section at the bottom and protrusions on the top, forming a "convex" shape; the bottom of the sealing ring 31 is located in the water ballast chamber 21, and the top of the sealing ring 31 is protruding toward the hull 17, and is fixed on the protrusion. The elastic ring 32 is made of nylon. The inner diameter, outer diameter and thickness of the bottom of the sealing ring 31 are adapted to the groove of the water ballast chamber 21; there are two symmetrical stop steps 22 in the water ballast chamber 21. The stop steps The distance between the edge of 22 and the bottom of the water ballast tank 21 is greater than the diameter of the 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 seal 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 seal ring 31 and the water ballast chamber 21. There are two inner water seals 61, and an inner distance ring 63 is arranged between the two inner water seals 61; there are two outer water seals 62, and an outer distance ring 64 is arranged between the two outer water seals 62.

The gland is divided into an inner gland 41 and an outer gland 42. The inner and outer glands 42 are both circular rings. The inner side of the inner gland 41 and the outer side of the outer gland 42 are both connected to the body of the slider 11, and the outer side of the inner gland 41 Press the inner part of the protrusion of the sealing ring 31, the inner side of the outer gland 42 presses the outer part of the protrusion of the seal ring 31, and the gap between the inner and outer gland 42 matches the width of the protrusion of the seal ring 31; the inner gland An inner frame seal 51 is provided between 41 and the protrusion of the sealing ring 31, an inner ring groove is provided on the inner pressure cover 41, an inner stop baffle 52 is installed in the inner ring groove, and the inner stop baffle 52 is close to the inner frame The outer side of the seal 51; an outer frame 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, and an outer stop baffle 54 is installed in the outer annular groove, and the outer stop The baffle 54 is close to the outside of the outer frame seal 53.

There are multiple sets of return springs evenly distributed along the circumference of the gland. The number of return springs matches the diameter of the 16 port of the suction pipe of the hull 17; there are two return springs in each group, which are located inside the inner and outer glands 42 and seals. Between the bottom of the ring 31. The pressure cover has a through hole at the place where the return spring is provided, the bottom of the through hole is provided with a step, the top of the through hole is provided with a cover 43, and the cover 43 is connected with the pressure cover bolt; the return spring includes a top pin 71 and a disc spring 72 , Circlip 73, the top pin 71 is "T" shaped 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, and the top of the pin rod is provided with a circlip 73. The pin seat is close to the sealing ring 31, and the four disc springs 72 are sleeved on the pin rod in a face-to-face installation manner and are located between the pin seat and the step.

The present invention has been described in accordance with the above-mentioned embodiments. It should be understood that the above-mentioned embodiments do not limit the present invention in any form, and all technical solutions obtained by equivalent substitutions or equivalent transformations fall within the protection scope of the present invention.

Claims

A trailing suction dredger's side-side suction action piston type sealing device, which is characterized in that it comprises a slider body, a water ballast chamber, 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, and the water inlet pipe is connected with a high-pressure flushing pipe on the slider body, and a throttle pipe is provided at the lower end of the water ballast tank bottom. The diameter of the inlet pipe is greater than the diameter of the throttle pipe;

The cross section of the sealing ring is convex; the bottom of the sealing ring is located in the water pressure tank, the top of the sealing ring is convex and facing the hull, and an elastic ring is fixed on the protrusion, and the bottom of the sealing ring is matched with the groove of the water pressure tank ；

The gland is divided into an inner gland and an outer gland. The inner and outer glands are both in a circular ring shape. The inner side of the inner gland and the outer side of the outer gland are both connected to the slider body, and the outer side of the inner gland presses the sealing ring convex The inner part of the outer gland presses the outer part of the sealing ring protrusion, and the gap between the inner and outer glands matches the width of the sealing ring protrusion;

The inner side of the inner gland is provided with an annular water seal chamber, the outlet of the throttle tube is connected with the water seal chamber, and the water seal chamber is provided with an annular groove or several water outlets on the side facing the hull;

There are multiple groups of the return springs evenly distributed along the circumference of the gland, and the number of groups of the return springs matches the diameter of the suction nozzle of the hull; there are two return springs in each group, which are located on the inner side of the inner and outer glands respectively. Between the bottom of the sealing ring;

Wear-bearing rings are provided on the friction surfaces between the water ballast chamber and the sealing ring, and between the gland and the sealing ring.
The trailing suction dredger's side suction water-acting piston type sealing device according to claim 1, characterized in that there are 2 to 3 throttling pipes, which are evenly distributed on the bottom of the water ballast tank, and all throttling The sum of the cross-sectional area of the pipe is smaller than the cross-sectional area of the inlet pipe.
The trailing suction dredger's side suction water-acting piston type sealing device according to claim 1, wherein two symmetrical stop steps are provided in the water ballast tank, and the distance between the edges of the stop steps is The distance between the bottom of the water ballast tank is greater than the diameter of the inlet pipe, and the distance between the two stop steps is less than the width of the bottom of the seal ring.
The trailing suction dredger's side suction water-acting piston type sealing device according to claim 1, wherein an inner frame seal is provided between the inner gland and the sealing ring protrusion, and the inner gland An inner annular groove is provided on the inner annular groove, and an inner stop baffle is installed in the inner annular groove, and the inner stop baffle is close to the outside of the inner frame seal; an outer frame seal is provided between the outer gland and the sealing ring protrusion, The outer gland is provided with an outer annular groove, and an outer stop baffle is installed in the outer annular groove, and the outer stop baffle is tightly attached to the outside of the outer frame seal.
The trailing suction dredger according to claim 1, characterized in that an internal water seal is provided between the inner side of the bottom of the sealing ring and the water ballast tank, and an internal water seal is provided between the inner side of the bottom of the sealing ring and the water ballast, and the An external water seal is provided between the outer side of the bottom of the sealing ring and the water pressure cabin.
According to claim 5, a trailing suction dredger's side suction water action piston type sealing device, characterized in that there are two internal water seals, and an internal distance ring is arranged between the two internal water seals There are two external water seals, and an external distance ring is arranged between the two external water seals.
The trailing suction dredger according to claim 1, characterized in that the pressure cover is provided with a through hole at the place where the return spring is provided, and the bottom of the through hole is provided with a step , The top of the through hole is provided with a cover, and the cover is connected with the gland by bolts; the return spring includes an ejector pin, a disc spring, and a circlip. The ejector pin is in a "T" shape and is divided into a pin rod and a pin seat; The diameter matches the through hole, the pin seat diameter matches the step, the pin rod passes through the through hole, the top of the pin rod is provided with a circlip, the pin seat is close to the sealing ring, and the four disc springs are mounted on the pin rod in a face-to-face installation manner. Located between the pin seat and the step.