CN215053372U - Elbow slide block sealing device for underwater pump of trailing suction dredger - Google Patents

Abstract

The utility model relates to the field of dredging engineering machinery, and discloses a bent pipe slider sealing device of an underwater pump of a trailing suction hopper dredger, which comprises a slider, a bent pipe, a half gland, a half pressing plate and sealing filler, wherein the slider is provided with a wear-resistant bush, the end part of the bent pipe is provided with a flange, and the flange of the bent pipe is sleeved in the wear-resistant bush of the slider; the half pressing covers are in a semi-circular shape, two half pressing covers form a ring shape and are fixed with the sliding block through bolts, the bent pipe flange and the wear-resistant lining are pressed tightly, and sealing filler is filled in a gap between the half pressing covers and the outer diameter of the bent pipe; the semi-pressing plate is in a semi-circular ring shape and covers a gap between the semi-pressing cover and the outer diameter of the bent pipe, the semi-pressing plate is provided with a ring-mounted boss along the inner arc, the width of the boss is matched with the gap between the semi-pressing cover and the outer diameter of the bent pipe, the two semi-pressing plates are combined into a ring shape and fixed with the semi-pressing cover through bolts, and the sealing filler is pressed by the boss. The utility model has the advantages that: the service life of the bent pipe is prolonged; the sealing effect is good, and the sealing filler is convenient to replace.

Description

Elbow slide block sealing device for underwater pump of trailing suction dredger

Technical Field

The utility model belongs to the field of dredging engineering machinery, concretely relates to trailing suction hopper dredger underwater pump return bend slider sealing device.

Background

With the development of dredging engineering towards large engineering and deep water in ports in recent years, the development of dredging ships is also large in size and large in digging depth, and all trailing suction dredgers with the digging depth of more than 35 meters are required to be provided with underwater pumps. In a ship for dredging by an underwater pump, a suction inlet bent pipe and a sliding block are combined and positioned in a discharge pipeline of the underwater dredge pump, the pressure is converted into positive pressure, if the pressure is not tightly sealed and leaks, dredged sediment causes water pollution around the ship, and simultaneously, water flow containing the sediment erodes the joint of the bent pipe and the sliding block at high speed, so that the bent pipe and the sliding block are damaged, and the dredging yield and efficiency are also greatly influenced. At present, a sealing structure for preventing mud leakage is not designed at the position of the underwater pump dredging and trailing suction ship designed in China, mud leaks out from the joint of the elbow and the sliding block in actual work, the elbow is damaged by serious scouring wear for a long time to cause the perforation of the position where the elbow is scoured, so that the function of the elbow is failed in advance, economic loss is caused, and meanwhile, serious potential safety and environmental protection hazards are brought. At present, the normal service cycle of the elbow is about half a year, and when the elbow is damaged and replaced, the number of accessories is large, and the time is about 4 days. One bent pipe weighs about 3 tons, and multiple persons are needed for cooperation during hoisting operation, so that safety risks exist in the whole hoisting operation process. Therefore, with the development of the trailing suction dredger showing a great digging depth trend, the sealing design work for the position is urgent, and the design and manufacture of the underwater pump elbow sliding block sealing device which is compact in structure and does not change the original basic structure is urgent.

SUMMERY OF THE UTILITY MODEL

In order to overcome the technical problem, the utility model provides a trailing suction hopper dredger underwater pump return bend slider sealing device.

In order to achieve the above object, the present invention is achieved by the following technical solutions.

The slide block sealing device for the bent pipe of the underwater pump of the trailing suction hopper dredger comprises a slide block, a bent pipe, a half gland, a half pressure plate and sealing packing, wherein the slide block is provided with a wear-resistant lining, the end part of the bent pipe is provided with a flange, and the flange of the bent pipe is sleeved in the wear-resistant lining of the slide block; the half gland is in a semicircular ring shape, the inner diameter of the half gland is larger than the outer diameter of the elbow and smaller than the outer diameter of the elbow flange, the two half glands form a ring shape and are fixed with the sliding block through bolts, the elbow flange and the wear-resistant lining are tightly pressed, and sealing filler is filled in a gap between the half gland and the outer diameter of the elbow; the semi-pressing plate is in a semi-circular ring shape and covers a gap between the semi-pressing cover and the outer diameter of the bent pipe, the semi-pressing plate is provided with a ring-mounted boss along the inner arc, the width of the boss is matched with the gap between the semi-pressing cover and the outer diameter of the bent pipe, the two semi-pressing plates are combined into a ring shape and fixed with the semi-pressing cover through bolts, and the sealing filler is pressed by the boss. On the premise of not changing the basic structure of the slide block of the bent pipe, a circular structural space formed by assembling the bent pipe and the half gland is used as a packing cavity, 3-4 packing elements of F25 multiplied by 25 can be placed in the cavity according to the size of the formed packing cavity, and the packing elements are tightly pressed by a half pressing plate after being arranged. The packing is to the packing of outer pipe outer wall through screwing up half clamp plate bolt and producing. Because the packing is an elastic plastic body, after the packing is compressed axially, friction force is generated to gradually reduce the packing force along the axial direction, and meanwhile, the produced radial packing force enables the packing to be tightly attached to the surface of the elbow pipe to prevent silt from leaking outwards. When the pressure of silt is decreased gradually from inner end to outer end, the medium pressure is equal to ambient pressure, so preventing leakage.

And a compression ring is arranged between the sealing filler and the half pressing plate, and an elastomer is arranged between the compression ring and the half pressing plate. Because the packing is arranged and is compressed tightly through the bolt with half clamp plate back, the packing wearing and tearing after a period of time, the cavity can appear in the packing chamber to lead to the leakproofness to descend, need the bolt on the half clamp plate of periodic fastening, delay the activity duration, personnel can't learn the packing wearing and tearing condition in addition, fastening bolt's degree is not good to be held, the wrong tension is that the packing pressurized too big can accelerated wear, the wrong pine can not reach sealed requirement again, need detect repeatedly, it is time-consuming to take a lot of work. After the compression ring and the elastic body are added, the elastic body presses the compression ring, pressure is uniformly applied to the packing, the compression ring is always compressed along with the abrasion of the packing, and therefore the purpose of one-time replacement and long-term use is achieved.

Furthermore, the pressure ring is composed of two semicircular rings, and the section of the pressure ring is in a right trapezoid shape. Because the inboard and outer tube outer wall of packing are in sliding friction all the time, and other positions are in static friction, therefore the inboard wearing and tearing speed of packing is very fast, and the clamping ring only compresses tightly the effect axially, treats that the packing outside wearing and tearing are sealed the inefficacy after the certain degree, and the packing still has most not wearing and tearing also must be changed this moment, causes the waste. And after the section of the compression ring is in a right trapezoid shape, the compression ring is continuously pressed down along with the abrasion of the packing, and the packing is forced to be tightly pressed towards the bent pipe, so that the period of packing replacement is prolonged.

Further, the elastic body is a hard spring or a spring sheet.

Furthermore, the half gland is composed of 4-8 equal arc sections. Because half gland size is great, and the external diameter reaches more than 1.6 meters, it is very inconvenient to carry hoist and mount, and the bolt hole is more difficult once only to aim at moreover, and after half gland decomposes into the segmental arc of equidimension, not only self weight descends and the bolt hole also easily aims at, very big shortening change time.

Further, the half pressing plate is composed of 4 arc segments with equal size. Because half clamp plate size is great, and the external diameter reaches more than 1.2 meters, the bolt hole is more difficult once only to aim at, and after half clamp plate decomposes into equidimension arc section, not only self weight descends but also the bolt hole is easy to aim at, very big shortening change time.

Has the advantages that: compared with the prior art, the utility model has the advantages of:

1) the structure is compact, safe and reliable, and the use is convenient;

2) the service life of the bent pipe is prolonged, and the service life of the bent pipe is prolonged from half a year to 3-5 years under the normal wear condition;

3) the sealing effect is good, the sealing filler is convenient to replace, the half gland can be directly disassembled, the bent pipe sliding block device does not need to be disassembled, the time and the labor are saved, and the dredging efficiency of the dredger is improved.

Drawings

FIG. 1 is a schematic view of a bent pipe;

FIG. 2 is a schematic view of a half-gland structure;

FIG. 3 is a schematic view of a half-platen configuration;

FIG. 4 is a schematic structural view of a slider sealing device for an elbow;

FIG. 5 is a partial enlarged view of the structure of the slider sealing device at the elbow pipe at A;

FIG. 6 is an enlarged view of a portion of the structure of the slider-bent tube sealing device according to embodiment 2A;

FIG. 7 is a schematic view of a structure of a pressure ring according to embodiment 2;

FIG. 8 is a schematic view of a half-gland structure according to embodiment 2;

FIG. 9 is an enlarged view of a portion of the structure of the slider seal of the elbow according to example 3A;

FIG. 10 is a schematic view of a half-gland structure according to embodiment 3;

FIG. 11 is a schematic view showing a structure of a half-platen according to example 3;

the structure comprises a sliding block 1, a wear-resistant bushing 2, a bent pipe 3, a bent pipe flange 4, a half gland 5, a sealing filler 6, a half pressing plate 7, a pressing ring 8, a spring 9 and a spring plate 10.

Detailed Description

The present invention will be described in further detail with reference to examples. The raw materials used by the utility model are commercially available products.

Example 1

As shown in fig. 1, 2, 3, 4 and 5, the slide block sealing device for the bent pipe of the underwater pump of the trailing suction hopper dredger comprises a slide block, a bent pipe 3, a half gland 5, a half pressure plate 7 and a sealing filler 6. The slider is equipped with wear-resisting bush 2, and 3 tip of return bend are equipped with the flange, and return bend flange 4 covers is in slider wear-resisting bush 2. Half gland 5 is that half annular internal diameter 1080mm, external diameter 1650mm, and half gland 5 internal diameter is greater than 3 external diameters 20mm of return bend, is less than return bend flange 4 external diameter 110mm, and two half glands 5 make up the annular and pass through 32M 66 bolts with the slider and fix, compress tightly return bend flange 4 and wear-resisting bush 2, are filled with 3-4 packing of F25 x 25 as gland packing 6 in the gap between half gland 5 and the return bend 3 external diameter. Half clamp plate 7 is half annular internal diameter 1072mm, external diameter 1230mm, covers on the gap between half gland 5 and return bend 3 external diameter, and half clamp plate 7 is equipped with ring installation boss along the inner circular arc, and the boss width matches with the gap between half gland 5 and the return bend 3 external diameter, and two half clamp plates 7 make up and encircle and pass through 18M 20 bolt fixings with half gland 5, compress tightly sealed filler 6 by the boss.

Example 2

As shown in fig. 6, 7, and 8, basically the same as in embodiment 1, except that a pressing ring 8 is provided between the sealing packing 6 and the half pressing plate 7, the pressing ring 8 is composed of two semicircular rings, the section of the pressing ring 8 is a right trapezoid, and a spring 9 is provided between the pressing ring 8 and the half pressing plate 7. The half gland 5 consists of 4 equal-sized arc sections, and a gap of 2-4 mm is formed between every two arc sections.

Example 3

As shown in fig. 9, 10, and 11, basically the same as in embodiment 1, except that a pressing ring 8 is provided between the sealing packing 6 and the half pressing plate 7, the pressing ring 8 is composed of two semicircular rings, the section of the pressing ring 8 is a right trapezoid, and the pressing ring 8 is pressed by an elastic piece 10. Half gland 5 comprises 8 equidimension segmental arcs, has 2~4 mm's clearance between every segmental arc, and half clamp plate 7 comprises 4 equidimension segmental arcs.

The present invention has been described in terms of the above embodiments, it should be understood that the above embodiments are not limited in any way, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation modes fall within the protection scope of the present invention.

Claims (6)

1. The sealing device for the bent pipe sliding block of the underwater pump of the trailing suction hopper dredger is characterized by comprising a sliding block, a bent pipe, a half pressing cover, a half pressing plate and sealing filler, wherein the sliding block is provided with a wear-resistant lining, the end part of the bent pipe is provided with a flange, and the bent pipe flange is sleeved in the wear-resistant lining of the sliding block; the half pressing covers are in a semi-circular shape, two half pressing covers form a ring shape and are fixed with the sliding block through bolts, the bent pipe flange and the wear-resistant lining are pressed tightly, and sealing filler is filled in a gap between the half pressing covers and the outer diameter of the bent pipe; the semi-pressing plate is in a semi-circular ring shape and covers a gap between the semi-pressing cover and the outer diameter of the bent pipe, the semi-pressing plate is provided with a ring-mounted boss along the inner arc, the width of the boss is matched with the gap between the semi-pressing cover and the outer diameter of the bent pipe, the two semi-pressing plates are combined into a ring shape and fixed with the semi-pressing cover through bolts, and the sealing filler is pressed by the boss.

2. The device for sealing the elbow slide block of the underwater pump of the trailing suction hopper dredger according to claim 1, wherein a pressure ring is arranged between the sealing filler and the half pressure plate, and an elastic body is arranged between the pressure ring and the half pressure plate.

3. The device for sealing the elbow slide block of the underwater pump of the trailing suction hopper dredger according to claim 2, wherein the pressure ring is composed of two semicircular rings, and the section of the pressure ring is in a right trapezoid shape.

4. The trailing suction hopper dredger underwater pump elbow slide block sealing device according to claim 2, wherein the elastic body is a hard spring or a spring plate.

5. The elbow sliding block sealing device for the underwater pump of the trailing suction hopper dredger according to claim 1, wherein the half gland is composed of 4-8 arc segments with equal size.

6. The trailing suction hopper dredger underwater pump elbow slide block sealing device according to claim 1, wherein the half pressure plate is composed of 4 equal-sized arc segments.

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