WO2021134988A1 - Bidirectional sealing apparatus for shipside suction port of trailing suction hopper dredger - Google Patents

Abstract

The present invention relates to the field of dredging engineering machinery. Disclosed is a bidirectional sealing apparatus for a shipside suction port of a trailing suction hopper dredger. A set of sealing apparatus is separately provided on a connection surface of a sliding block and a suction port retaining ring, and that of the sliding block and a trailing suction pipe; the sealing apparatus comprises an air cylinder, a sealing ring, a press cover, a reverse thrust spring, and an air seal; the air cylinder faces the outer side of the sliding block; an air inlet is formed on the bottom of the air cylinder; the cross section of the sealing ring is in the shape of a Chinese character "凸"; the bottom of the sealing ring is located in the air cylinder; an air inlet is formed on the bottom of the air cylinder; the top of the sealing ring protrudes out of the outer side of the air cylinder; an elastic ring is fixed on a protrusion; the press cover is fixed to the sliding block and presses the two sides of the protrusion of the sealing ring; the reverse thrust spring is located between the inner side of the press cover and the sealing ring; the air seal is located between the sealing ring and the air cylinder; and a communication pipe is provided between the air cylinders of two sets of sealing apparatuses. The present invention has the advantages of using an air cylinder sealing ring to replace an air bag, prolonging the service life of the sealing apparatus, and using bidirectional sealing to simultaneously seal the docking ports of the two sides of the sliding block.

Description

Two-way sealing device for side suction port of trailing suction dredger Technical field

The invention belongs to the technical field of dredging engineering machinery, and specifically relates to a two-way sealing device for a side suction port 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 sliding block and the trailing suction pipe and the sliding block and the hull suction are always in a negative pressure state, and there is no mud water leakage problem; but the mud pump is placed in front of the trailing suction pipe, the sliding block and the trailing suction pipe And the sliding block and the hull suction port are in a positive pressure state. If there is no good sealing device to seal the interface, it will cause mud water leakage and cause water pollution in the channel. Due to the impact of the assembly gap between the slider and the side slide, 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 straw, there is a fluctuating river/seabed. In the hard and soft areas, there is a swing in the up and down and left and right directions when the raking suction tube passes, so that there is a non-planar twist between the slider and the mud suction port, and there is in-plane rotation between the sliding block and the raking suction tube. Due to these relative movements, the contact surface needs to be sealed to avoid leakage.

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. When the pressure is too high, the airbag will be fatigued for a long time and shorten the service life, and no matter the air pressure is too high Or too small 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 the installation is improper, it is easy to make a small part of the airbag protrude from the slider. High demands. 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 two-way sealing device for the side suction port of a trailing suction dredger.

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

A two-way sealing device for the side suction port of a trailing suction dredger. A set of sealing devices are respectively provided on the butting surface of the sliding block and the suction pipe and the connecting surface of the sliding block and the trailing suction pipe. The sealing device includes a cylinder, a sealing ring, and a gland , Reverse thrust spring, air seal;

The cylinder faces the outside of the slider, and the bottom of the cylinder is provided with an air inlet; the sealing ring has a convex cross section, the bottom of the sealing ring is located in the cylinder, and an air inlet is provided at the bottom of the cylinder, and the top of the sealing ring protrudes from the outside of the cylinder. An elastic ring is fixed on the boss, the gland and the slider are fixed and press the two sides of the sealing ring boss, the reverse thrust spring is located between the inner side of the gland and the sealing ring, and the air seal is between the sealing ring and the cylinder;

A communication pipe is arranged between the cylinders of the two sets of sealing devices.

The principle is: after the trailing suction pipe is connected to the suction pipe, compressed air is introduced through the air inlet to push the sealing rings in the cylinders on both sides to extend, and the elastic ring on the boss on the top of the sealing ring squeezes the suction pipe mouth and Harrow the mouth of the suction pipe to form a seal. Since the sealing ring is pushed by compressed gas, the extended state of the sealing ring is dynamic, and the suction pipe mouth can always be attached to the suction pipe to seal during the shaking of the trailing suction pipe. When the operation is over, the air inlet stops passing compressed air, and the sealing ring retracts to the cylinder under the action of the reverse thrust spring to release the seal.

Further, the cross section of the cylinder is a rectangular annular groove, which is arranged on the side of the slider, the opening direction of the annular groove faces the outside of the slider, and the diameter of the cylinder matches the diameter of the connected pipeline.

Further, the bottom of the sealing ring is located in the cylinder, the top of the sealing ring is convex and facing the outside of the cylinder, an elastic ring is fixed on the protrusion, and the bottom of the sealing ring is matched with the groove of the cylinder; the elastic ring adopts self-lubricating high Molecular elastic ring. Due to the irregular shaking of the raking suction pipe, the elastic ring and the suction nozzle are in slight sliding friction, and the wear of the elastic ring is very serious. Therefore, the use of a self-lubricating polymer elastic ring greatly reduces the degree of wear and extends the maintenance cycle . The elastic ring has a certain thickness, which can keep the seal even with a small amount of wear. The polymer elastic material is selected from one of ultra-high molecular weight polyethylene, polytetrafluoroethylene, and nylon.

Further, the gland is divided into an inner gland and an outer gland, the inner and outer glands are both circular ring, the inner side of the inner gland and the outer side of the outer gland are both connected with the slider, and the outer side of the inner gland presses the sealing ring The inner part of the protrusion, the inner side 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.

Further, there are multiple sets of reverse thrust springs evenly distributed along the circumference of the gland, and the number of reverse thrust springs matches the diameter of the docking pipeline; there are two reverse thrust springs in each group, which are located on the inner side of the inner and outer glands. Between the end faces on both sides of the sealing ring boss.

Further, the gas seal is divided into an inner gas seal and an outer gas seal. The inner gas seal is located between the inner side of the bottom of the seal ring and the cylinder, and the outer gas seal is located between the outer side of the bottom of the seal ring and the cylinder. Preferably, there are two inner air seals; and two outer air seals. Since air pressure is used to push the seal ring, effective gas sealing is very necessary. In order to better seal the gas, double gas seals are used.

Further, an inner frame seal is provided between the inner gland and the sealing ring boss, an inner annular groove is provided on the inner gland, and an inner stop baffle is installed in the inner annular groove, and the inner stop baffle is in close contact with The inner frame seals the outside; an outer frame seal is provided between the outer gland and the sealing ring boss, 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 stopper The board is close to the outside of the outer frame seal. The muddy water needs to withstand the impact of the inner gland and the sealing ring boss. The pressure of the muddy water is relatively high, and it must rush into the gap between the inner gland and the sealing ring boss, which will adversely affect the reset disc spring. Therefore, a skeleton seal is arranged between the inner gland and the sealing ring boss to prevent muddy water from entering, and to fix the skeleton seal, an annular groove is arranged on the gland, and a retaining 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 sealing ring boss, only the water pressure where the suction pipe is located. In order to protect the disc spring assembly from seawater corrosion, a line is also set between the outer gland and the sealing ring boss The skeleton is sealed.

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

1) The use of cylinder sealing ring instead of airbags prolongs the service life of the sealing device;

2) 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 between the slider and the mud suction port to maintain a good seal;

3) Two-way sealing is adopted, and the opposite interfaces on both sides of the slider are simultaneously sealed.

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 a schematic diagram of the relative position of the sealing device, the suction pipe and the trailing suction pipe;

Fig. 4 A partial enlarged schematic view of the cross section of the sealing device;

Figure 5 is a partial enlarged schematic view of the gland in the sealing device;

Figure 6 is a partial enlarged schematic diagram of the outer gland of the sealing device;

Among them, 11. Slider, 12. Sealing device, 13. Suction pipe, 14. Harrow suction pipe, 15. Hull, 21. Cylinder, 22. Stop step, 23. Air inlet, 24. Connecting pipe, 31. Seal Ring, 32. Elastic ring, 41. Inner gland, 42. Outer gland, 51. Top pin, 52. Disc spring, 53. Circlip, 54. Seal plate, 61. Inner air seal, 62. Outer air seal , 71. Wear ring, 81. Inner frame seal, 82. Inner stop baffle, 83. Outer frame seal, 84. Outer stop baffle.

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 two-way sealing device for the side suction port of a trailing suction dredger. A set of sealing devices 12 are respectively provided on the butting surface of the sliding block 11 and the suction pipe 13 and the connection surface of the sliding block 11 and the trailing suction pipe 14. The sealing device 12 includes an air cylinder 21. Seal ring 31, gland, reverse thrust spring, air seal; the cylinder 21 faces the outside of the slider 11, and the bottom of the cylinder 21 is provided with an air inlet 23; the cross section of the seal ring 31 is convex, and the seal ring 31 The bottom is located in the cylinder 21, the bottom of the cylinder 21 is provided with an air inlet 23, the top of the sealing ring 31 protrudes outside the cylinder 21, an elastic ring 32 is fixed on the protrusion, and the gland is fixed with the slider 11 and presses the sealing ring 31 On both sides of the protrusion, the reverse thrust spring is located between the inner side of the gland and the sealing ring 31, and the air seal is located between the sealing ring 31 and the cylinder 21; a connecting pipe 24 is provided between the cylinders 21 of the two sets of sealing devices 12.

The cross section of the cylinder 21 is a rectangular annular groove, which is arranged on the side of the slider 11, the opening direction of the annular groove faces the outside of the slider 11, and the diameter of the cylinder 21 matches the diameter of the connected pipeline.

The bottom of the sealing ring 31 is located in the cylinder 21, the top of the sealing ring 31 is convex and facing the outside of the cylinder 21, and an elastic ring 32 is fixed on the protrusion, and the bottom of the sealing ring 31 matches the groove of the cylinder 21; The ring 32 is an elastic ring 32 made of nylon.

A wear ring 71 is provided on the friction surfaces of the cylinder 21 and the sealing ring 31 and the gland and the sealing ring 31.

The pressure cover is divided into an inner pressure cover 41 and an outer pressure cover 42. The inner and outer pressure covers 42 are both in a circular ring shape. The inner side of the inner pressure cover 41 and the outer side of the outer pressure cover 42 are both connected to the slider 11, and the inner pressure cover 41 The outside presses the convex inner part of the sealing ring 31, the inside of the outer gland 42 presses the convex outside part of the seal ring 31, and the gap between the inner and outer glands 42 matches the convex width of the seal ring 31.

There are multiple sets of reverse thrust springs evenly distributed along the circumference of the gland, and the number of reverse thrust springs matches the diameter of the docking pipeline; there are two reverse thrust springs in each group, located on the inner side of the inner and outer gland 42 and the seal Between the bottom of the ring 31.

The air seal is divided into an inner air seal 61 and an outer air seal 62. The inner air seal 61 is located between the inner side of the bottom of the sealing ring 31 and the cylinder 21, and the outer air seal 62 is located between the outer side of the bottom of the sealing ring 31 and the cylinder 21.

There are two inner air seals 61; there are two outer air seals 62.

Example 2

A two-way sealing device for the side suction port of a trailing suction dredger. A set of sealing devices 12 are respectively provided on the butting surface of the sliding block 11 and the suction pipe 13 and the connection surface of the sliding block 11 and the trailing suction pipe 14. The sealing device 12 includes an air cylinder 21. Seal ring 31, gland, reverse thrust spring, air seal; the cylinder 21 faces the outside of the slider 11, and the bottom of the cylinder 21 is provided with an air inlet 23; the cross section of the seal ring 31 is convex, and the seal ring 31 The bottom is located in the cylinder 21, the bottom of the cylinder 21 is provided with an air inlet 23, the top of the sealing ring 31 protrudes outside the cylinder 21, an elastic ring 32 is fixed on the protrusion, and the gland is fixed with the slider 11 and presses the sealing ring 31 On both sides of the protrusion, the reverse thrust spring is located between the inner side of the gland and the sealing ring 31, and the air seal is located between the sealing ring 31 and the cylinder 21; a connecting pipe 24 is provided between the cylinders 21 of the two sets of sealing devices 12.

The cross section of the cylinder 21 is a rectangular annular groove, which is arranged on the side of the slider 11, the opening direction of the annular groove faces the outside of the slider 11, and the diameter of the cylinder 21 matches the diameter of the connected pipeline. Two symmetrical stop steps 22 are provided in the cylinder 21. The distance between the edge of the stop step 22 and the bottom of the cylinder 21 is greater than the diameter of the air inlet 23, and the distance between the two stop steps 22 is less than the width of the bottom of the seal ring 31.

The bottom of the sealing ring 31 is located in the cylinder 21, the top of the sealing ring 31 is convex and facing the outside of the cylinder 21, and an elastic ring 32 is fixed on the protrusion, and the bottom of the sealing ring 31 matches the groove of the cylinder 21; The ring 32 is an elastic ring 32 made of polytetrafluoroethylene.

A wear ring 71 is provided on the friction surfaces of the cylinder 21 and the sealing ring 31 and the gland and the sealing ring 31.

The pressure cover is divided into an inner pressure cover 41 and an outer pressure cover 42. The inner and outer pressure covers 42 are both in a circular ring shape. The inner side of the inner pressure cover 41 and the outer side of the outer pressure cover 42 are both connected to the slider 11, and the inner pressure cover 41 The outside presses the convex inner part of the sealing ring 31, the inside of the outer gland 42 presses the convex outside part of the seal ring 31, and the gap between the inner and outer glands 42 matches the convex width of the seal ring 31.

There are multiple sets of reverse thrust springs evenly distributed along the circumference of the gland, and the number of reverse thrust springs matches the diameter of the docking pipeline; there are two reverse thrust springs in each group, located on the inner side of the inner and outer gland 42 and the seal Between the bottom of the ring 31. The gland is provided with a through hole where a reverse thrust spring is provided, the bottom of the through hole is provided with a step, and the top of the through hole is provided with a sealing plate 54 which is connected with the gland bolt; the reverse thrust spring includes a top pin 51, a disc The spring 52, the circlip 53, and the top pin 51 are in a "T" shape and are 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 the top of the pin rod is set The circlip 53 and the pin seat are close to the sealing ring 31, and the four disc springs 52 are sleeved on the pin rod in a face-to-face installation manner and are located between the pin seat and the step.

The air seal is divided into an inner air seal 61 and an outer air seal 62. The inner air seal 61 is located between the inner side of the bottom of the sealing ring 31 and the cylinder 21, and the outer air seal 62 is located between the outer side of the bottom of the sealing ring 31 and the cylinder 21.

There are two inner air seals 61; there are two outer air seals 62.

Example 3

As shown in Figures 1 to 6, a two-way sealing device for the side suction port of a trailing suction dredger is provided with a set of sealing devices 12 on the butting surface of the sliding block 11 and the suction pipe 13 and the connection surface of the sliding block 11 and the trailing suction pipe 14 respectively. The sealing device 12 includes a cylinder 21, a sealing ring 31, a gland, a reverse thrust spring, and an air seal; the cylinder 21 faces the outside of the slider 11, and the bottom of the cylinder 21 is provided with an air inlet 23; The cross section is convex, the bottom of the sealing ring 31 is located in the cylinder 21, the bottom of the cylinder 21 is provided with an air inlet 23, the top of the sealing ring 31 protrudes outside the cylinder 21, and an elastic ring 32 is fixed on the boss, the gland and the slider 11 Fix and press the two protruding sides of the sealing ring 31, the reverse thrust spring is located between the inner side of the gland and the sealing ring 31, and the air seal is located between the sealing ring 31 and the cylinder 21; between the cylinders 21 of the two sets of sealing devices 12 With a connecting pipe 24.

The cross section of the cylinder 21 is a rectangular annular groove, which is arranged on the side of the slider 11, the opening direction of the annular groove faces the outside of the slider 11, and the diameter of the cylinder 21 matches the diameter of the connected pipeline. Two symmetrical stop steps 22 are provided in the cylinder 21. The distance between the edge of the stop step 22 and the bottom of the cylinder 21 is greater than the diameter of the air inlet 23, and the distance between the two stop steps 22 is less than the width of the bottom of the seal ring 31.

The bottom of the sealing ring 31 is located in the cylinder 21, the top of the sealing ring 31 is convex and facing the outside of the cylinder 21, and an elastic ring 32 is fixed on the protrusion, and the bottom of the sealing ring 31 matches the groove of the cylinder 21; The ring 32 is an elastic ring 32 made of ultra-high molecular weight polyethylene.

A wear ring 71 is provided on the friction surfaces of the cylinder 21 and the sealing ring 31 and the gland and the sealing ring 31.

The pressure cover is divided into an inner pressure cover 41 and an outer pressure cover 42. The inner and outer pressure covers 42 are both in a circular ring shape. The inner side of the inner pressure cover 41 and the outer side of the outer pressure cover 42 are both connected to the slider 11, and the inner pressure cover 41 The outside presses the convex inner part of the sealing ring 31, the inside of the outer gland 42 presses the convex outside part of the seal ring 31, and the gap between the inner and outer glands 42 matches the convex width of the seal ring 31.

An inner frame seal 81 is provided between the inner pressure cover 41 and the bosses, an inner annular groove is provided on the inner pressure cover 41, an inner stop baffle 82 is installed in the inner ring groove, and the inner stop baffle 82 is tight. Attached to the outside of the inner frame seal 81; an outer frame seal 83 is provided between the outer gland 42 and the bosses, an outer annular groove is provided on the outer gland 42, and an outer stop baffle 84 is installed in the outer annular groove, The outer stop baffle 84 is close to the outside of the outer frame seal 83.

There are multiple sets of reverse thrust springs evenly distributed along the circumference of the gland, and the number of reverse thrust springs matches the diameter of the docking pipeline; there are two reverse thrust springs in each group, located on the inner side of the inner and outer gland 42 and the seal Between the bottom of the ring 31. The gland is provided with a through hole where a reverse thrust spring is provided, the bottom of the through hole is provided with a step, and the top of the through hole is provided with a sealing plate 54 which is connected with the gland bolt; the reverse thrust spring includes a top pin 51, a disc The spring 52, the circlip 53, and the top pin 51 are in a "T" shape and are 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 the top of the pin rod is set The circlip 53 and the pin seat are close to the sealing ring 31, and the four disc springs 52 are sleeved on the pin rod in a face-to-face installation manner and are located between the pin seat and the step.

The air seal is divided into an inner air seal 61 and an outer air seal 62. The inner air seal 61 is located between the inner side of the bottom of the sealing ring 31 and the cylinder 21, and the outer air seal 62 is located between the outer side of the bottom of the sealing ring 31 and the cylinder 21.

There are two inner air seals 61; there are two outer air seals 62.

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 (7)

A two-way sealing device for the side suction port of a trailing suction dredger is characterized in that a set of sealing devices are respectively provided on the butting surface of the sliding block and the suction pipe and the connecting surface of the sliding block and the trailing suction pipe. The sealing device includes a cylinder and a sealing device. Ring, gland, reverse thrust spring, air seal; The cylinder faces the outside of the slider, and the bottom of the cylinder is provided with an air inlet; the sealing ring has a convex cross section, the bottom of the sealing ring is located in the cylinder, and an air inlet is provided at the bottom of the cylinder, and the top of the sealing ring protrudes from the outside of the cylinder. An elastic ring is fixed on the boss, the gland and the slider are fixed and press the two sides of the sealing ring boss, the reverse thrust spring is located between the inner side of the gland and the sealing ring, and the air seal is between the sealing ring and the cylinder; A communication pipe is arranged between the cylinders of the two sets of sealing devices. The trailing suction dredger's side suction port two-way sealing device according to claim 1, wherein the cross section of the cylinder is an irregular rectangular annular groove, which is arranged on the side of the sliding block, and the opening of the annular groove The direction is toward the outside of the slider, and the diameter of the cylinder matches the diameter of the pipe to be connected. The trailing suction dredger's side suction port two-way sealing device according to claim 1, wherein the bottom of the sealing ring is located in the cylinder, and the top of the sealing ring is convex and faces the outside of the cylinder, and is fixed on the convex There is an elastic ring, and the bottom of the sealing ring is matched with the groove of the cylinder; the elastic ring adopts a self-lubricating polymer elastic ring. The trailing suction dredger's side suction port two-way sealing device according to claim 1, wherein the gland is divided into an inner gland and an outer gland, and the inner and outer glands are both annular, The inner side of the inner gland and the outer side of the outer gland are connected with the slider, the outer side of the inner gland presses the inner part of the sealing ring protrusion, the inner side of the outer gland presses the outer part of the sealing ring protrusion, between the inner and outer glands The gap is matched with the convex width of the sealing ring. The trailing suction dredger's side suction port two-way sealing device according to claim 1, characterized in that there are multiple sets of reverse thrust springs evenly distributed along the circumference of the gland, and the number of reverse thrust springs and the docking pipeline The caliber is matched; there are two reverse thrust springs in each group, which are respectively located between the inner side of the inner and outer glands and the end faces on both sides of the sealing ring boss. The trailing suction dredger side suction port bidirectional sealing device according to claim 1, wherein the gas seal is divided into an inner gas seal and an outer gas seal, and the inner gas seal is located between the inner side of the bottom of the seal ring and the cylinder The outer air seal is located between the outside of the bottom of the sealing ring and the cylinder. The trailing suction dredger's side suction port two-way sealing device according to claim 1, wherein an inner frame seal is provided between the inner gland and the sealing ring boss, and the inner gland is provided with In the inner annular groove, 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 and an outer gland are provided between the outer gland and the sealing ring boss An outer annular groove is arranged on the 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.

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