CN212273407U - Be applied to exhaust apparatus on sealed internal expanding ring of pipeline - Google Patents

Abstract

The utility model discloses an exhaust apparatus who is applied to sealed inner expanding ring of pipeline belongs to exhaust apparatus technical field. The exhaust device of the utility model comprises an exhaust mechanism, wherein the exhaust mechanism comprises a first baffle and a second baffle, a through hole is arranged in the first baffle, and a round hole is arranged on the second baffle; the first baffle and the second baffle are detachably connected; the through hole is internally and detachably provided with an ejector rod, and the shape of the through hole is matched with that of the ejector rod. The utility model discloses an application method is comparatively simple, accomplishes the back at the installation, when needing to exhaust, only needs to dismantle the ejector pin from the through-hole, can discharge the gas between inner piston ring and the pipeline to because there is gas and the inner piston ring that leads to between inner piston ring and the pipeline is outstanding when having avoided the water delivery, has reduced the resistance, makes it can not obstruct the flow of rivers, has strengthened the efficiency of water delivery.

Description

Be applied to exhaust apparatus on sealed internal expanding ring of pipeline

Technical Field

The utility model belongs to the technical field of the exhaust apparatus technique and specifically relates to an exhaust apparatus who is applied to sealed internal expanding ring of pipeline that says so.

Background

With the increasing urbanization level of the national cities, the water supply pipeline reaches 79.7 kilometers in the end of 2017 years, and the water discharge pipeline reaches 60 kilometers. When the pipeline is used for drainage or water supply, the efficiency of the water conveying equipment needs to be ensured, the pipeline is protected from deformation and breakage, and the pipeline is prevented from being damaged, and an exhaust device is generally arranged on the pipeline.

The exhaust equipment is usually used for exhausting gas in the pipeline to prevent the pipeline from being damaged to influence the water delivery efficiency. In order to improve the sealing performance of the pipeline and the water delivery efficiency, an in-layer expansion ring is usually attached to the inner wall of the pipeline to play a role in sealing and prevent the pipeline from leaking water. But when the installation, can have gas between internal expanding ring and the pipeline inner wall to it is protruding to make internal expanding ring when rivers transportation, and the internal expanding ring of bellied part can obstruct rivers, thereby reduces rivers exhaust efficiency, and when serious, still can lead to internal expanding ring to lose sealed effect, leads to the pipeline to leak, seriously reduces water delivery efficiency.

Through retrieval, related patents are disclosed at present for solving the problem that the water delivery efficiency is affected due to the fact that gas exists in the water delivery pipeline and the pipeline is easily damaged. For example, chinese patent application, application number: CN201911232153.8, published date: the utility model discloses a patent application of 21 days in 4 months in 2020, a water supply line exhaust apparatus is disclosed, include the standpipe and fix the casing at the standpipe top, the bottom of casing runs through fixedly connected with and has bottom open-ended body, one side of body has two at least outlet ducts with the same interval intercommunication along vertical, the one end that the body was kept away from to two outlet ducts runs through the outside to the casing, the inner wall of body and the bottom position fixedly connected with valve body that corresponds every outlet duct, the below of every valve body all is provided with the valve block, the middle part of valve body seted up with valve block matched with slot, through elastic connection spare fixed connection between two adjacent valve blocks, the length that elastic connection spare is in under the normal condition is greater than the distance of two adjacent valve bodies. The disadvantages of the scheme are that: this exhaust apparatus structure is great relatively, is applicable to the inside exhaust of drain pipe, but can't be used for the exhaust pipe and the internal expanding ring between gaseous, consequently can't solve the protruding problem that hinders rivers transportation of internal expanding ring.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

The utility model provides a gas that can exist between internal expanding ring and the pipeline inner wall can make the internal expanding ring protruding and hinder the problem of rivers transportation, the utility model discloses an be applied to the exhaust apparatus who circles that rises in the pipe-sealing, the utility model provides an exhaust apparatus installs on the internal expanding ring, and the outer wall of internal expanding ring and the inner wall laminating of pipeline, when the production gas leads to the internal expanding ring protruding between pipeline and the internal expanding ring, inside exhaust apparatus can emit into the pipeline with gas to can effectively solve the protruding problem that hinders rivers transportation of internal expanding ring, and exhaust apparatus's mounting method is comparatively simple, and easy operation is convenient.

2. Technical scheme

In order to achieve the above purpose, the utility model provides a technical scheme does:

an exhaust device applied to an inner expansion ring for sealing a pipeline is characterized in that the inner expansion ring is attached and fixed on the inner wall of the pipeline in an annular band shape when in use and comprises an exhaust mechanism, the exhaust mechanism comprises a first baffle and a second baffle, a through hole is formed in the first baffle, and a round hole is formed in the center of the second baffle; the first baffle and the second baffle are detachably connected to the inner wall surface and the outer wall surface of the inner piston ring, and after the first baffle and the second baffle are connected, the round hole in the second baffle is communicated with the through hole in the first baffle; the through hole is internally and detachably provided with an ejector rod, and the shape of the through hole is matched with that of the ejector rod; the round hole is communicated with the through hole.

Because the round hole on the second baffle communicates with each other with the through-hole in the first baffle, consequently, the round hole on the second baffle communicates the inboard and the outside of inner piston ring with the through-hole in the first baffle, when having gas between the outer wall of pipeline inner wall and inner piston ring, dismantles the ejector pin, and in the round hole that gas can set up on the second baffle entered into the through-hole in the first baffle to can follow the through-hole discharge in the first baffle, get into in the pipeline.

According to the technical scheme, the first baffle comprises a bottom plate and a fixing column, and the second baffle is detachably mounted on the fixing column.

According to the technical scheme, the inner diameter of the round hole is the same as the outer diameter of the fixed column, external threads are arranged on the outer wall of the fixed column, internal threads are arranged on the inner side of the round hole, the internal threads on the inner side of the round hole are matched with the external threads on the fixed column, and the installation and the disassembly in a threaded connection mode are simple.

According to the further technical scheme, the corrugated groove is formed in the side, abutted to the inner wall of the inner expansion ring, of the first baffle plate, and the corrugated groove can be further fixed, so that the first baffle plate and the inner expansion ring are connected more stably.

According to the further technical scheme, the top of the fixing column is provided with an elongated slot, so that gas between the inner piston ring and the pipeline can conveniently enter the through hole through the elongated slot and be discharged.

According to the technical scheme, the inner wall of the through hole is provided with an internal thread, the outer wall of the ejector rod is provided with an external thread matched with the internal thread on the inner wall of the through hole, and the ejector rod is simple to mount and dismount in a threaded connection mode.

According to a further technical scheme, the ejector rod comprises a connecting and fixing section, a contraction section, a transition section and a sealing section which are sequentially connected; the connection fixing section is externally provided with an external thread, the sealing section is externally provided with an annular sealing gasket, the sealing performance is enhanced, and new gas is prevented from entering.

According to the further technical scheme, the second baffle is provided with a small hole, so that the air can flow conveniently.

The use method of the exhaust device applied to the inner expansion ring for pipeline sealing comprises the following steps of:

the first baffle is installed on the inner wall of the inner piston ring, a fixing column on the first baffle is installed in an installation hole of the inner piston ring, and the diameter of the installation hole is the same as that of the fixing column; the second baffle is arranged on the outer wall of the inner piston ring and is in threaded connection with the fixed column; the ejector rod is in threaded connection with the through hole, and the ejector rod is screwed out of the through hole when exhaust is needed.

According to the further technical scheme, the hexagonal hole is formed in the bottom end of the ejector rod, so that the ejector rod is convenient to rotate in a screwing mode.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:

(1) the utility model discloses an exhaust apparatus, when using exhaust mechanism, dismantle the ejector pin, the gas that lies in between internal expanding circle outer wall and the pipeline inner wall can be discharged into the pipeline through the inside through-hole of first baffle in, the problem of the hindrance rivers transportation that the internal expanding circle protrusion that has caused when having more gas between internal expanding circle outer wall and the pipeline inner wall when having avoided water delivery, after gaseous the row, install the ejector pin, thereby can stop up the gas passage between pipeline inner wall and the internal expanding circle outer wall, the gas circulation has been avoided, when not influencing internal expanding circle leakproofness, can also strengthen water delivery efficiency.

(2) The utility model discloses an exhaust apparatus, the elongated slot at fixed column top portion is convenient for guide gas between inner piston ring and the pipeline and passes through the elongated slot and enter into the through-hole and discharge.

(3) The utility model discloses an exhaust apparatus, the seal section is provided with sealed the pad outward, and the position that matches with the seal section in the through-hole also is provided with sealed the pad, when not using exhaust mechanism, will push rod revolve twist seal into in the through-hole and seal, consequently can make sealed pad in the through-hole and the sealed pad pressfitting each other on the push rod seal section, and the pressfitting can strengthen exhaust mechanism's leakproofness between the double-deck sealed pad, can avoid having between new gas admission pipeline inner wall and the internal expanding circle outer wall.

(4) The utility model discloses an exhaust apparatus, second baffle twist soon back on the fixed column, can increase the interaction force between first baffle, second baffle and the internal expanding circle, and the setting of ripple groove can further strengthen exhaust mechanism's steadiness on the bottom of first baffle, makes first baffle more firm with being connected of internal expanding circle.

(5) The utility model discloses an exhaust apparatus, the aperture of seting up on the outer wall of second baffle makes things convenient for the gas flow.

(6) The utility model discloses an exhaust apparatus, because ejector pin and through-hole threaded connection, the hexagonal hole that the bottom surface of ejector pin was seted up, the dismantlement and the installation of the ejector pin of being convenient for.

Drawings

Fig. 1 is a schematic top view of the inner expanding ring of the present invention;

fig. 2 is a schematic bottom view of the inner piston ring of the present invention;

FIG. 3 is a schematic sectional view of the exhaust apparatus of the present invention;

fig. 4 is a schematic three-dimensional structure of the exhaust device of the present invention;

fig. 5 is a schematic structural view of the exhaust apparatus of the present invention;

fig. 6 is a schematic exploded view of the exhaust apparatus of the present invention;

fig. 7 is a schematic exploded view of the exhaust apparatus of the present invention;

fig. 8 is a sectional view of the ejector pin of the present invention.

In the figure:

1. an inner piston ring; 101. a protrusion; 102. concave holes;

2. an exhaust mechanism; 201. a first baffle plate; 2011. a base plate; 2012. fixing a column; 202. a second baffle; 2021. a circular hole; 203. a through hole; 204. a top rod; 2041. connecting the fixed sections; 2042. a contraction section; 2043. a transition section; 2044. a sealing section; 2045. a gasket; 205. a hexagonal hole; 206. a long groove; 207. a small hole;

3. a corrugated groove.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings.

Example 1

In the exhaust device applied to the inner expansion ring for sealing the pipeline, when in use, the inner expansion ring 1 is in an annular shape and is fixed on the inner wall of the pipeline in an attaching manner, as shown in fig. 1 to 7, the exhaust device comprises an exhaust mechanism 2, the exhaust mechanism 2 comprises a first baffle plate 201 and a second baffle plate 202, a through hole 203 is formed in the first baffle plate 201, and a round hole 2021 is formed in the center of the second baffle plate 202; the first baffle plate 201 and the second baffle plate 202 are detachably connected to the inner wall surface and the outer wall surface of the inner piston ring 1, and after the connection is completed, the round hole 2021 on the second baffle plate 202 is communicated with the through hole 203 in the first baffle plate 201; a top rod 204 is movably arranged in the through hole 203, and the shape of the through hole 203 is matched with that of the top rod 204; the round hole 2021 communicates with the through hole 203.

With the increasing level of urbanization of the national cities, the water delivery pipeline reaches all around, so that higher requirements are provided for the sealing property of the pipeline and the water delivery efficiency of the pipeline. In order to enhance the sealing performance of the water pipeline and prevent the water leakage of the pipeline, an inner piston ring 1 is usually attached to the inner wall of the pipeline, wherein the outer wall of the inner piston ring 1 is attached to the inner wall of the pipeline, and in order to enhance the adsorbability and the sealing performance, the outer wall of the inner piston ring 1 is provided with a protrusion 101 and a concave hole 102. But when piston ring 1 in the pipeline installation, gas can exist between the outer wall of pipeline inner wall and piston ring 1 in the difficult exemption, because the rivers that flow have pressure, can produce an extruded effect to the gas that exists between the outer wall of pipeline inner wall and piston ring 1 during consequently rivers transportation, will lead to piston ring 1 to the inside arch of pipeline, can obstruct the transportation of rivers, and in the serious time, can lead to piston ring 1 to lose the leakproofness, leads to the pipeline leakproofness to reduce.

In order to overcome the defects, the applicant of the present application improves the defects, and adds the exhaust mechanism 2 on the inner expansion ring 1, so that when gas is accumulated between the inner wall of the pipeline and the outer wall of the inner expansion ring 1, the gas can be rapidly exhausted by using the exhaust mechanism 2, and the water delivery efficiency is improved.

A plurality of circular mounting holes are formed in the smooth rubber layer between the protrusions 101 and the concave holes 102 in the inner piston ring 1, the exhaust mechanism 2 is mounted on the inner piston ring 1, and the mounting steps are as follows:

the first baffle 201 of the exhaust mechanism 2 comprises a bottom plate 2011 and fixing columns 2012, the bottom plate 2011 is a circular bottom plate 2011, the fixing columns 2012 are cylindrical, and the outer diameters of the fixing columns 2012 are the same as the inner diameters of the mounting holes. Firstly, the fixing column 2012 is inserted into the mounting hole, and an external thread is arranged on the outer wall of the fixing column 2012, so that the friction force between the fixing column 2012 and the inner expansion ring 1 can be increased, the mounting is more stable, and meanwhile, the surface of the bottom plate 2011 connected with the fixing column 2012 is abutted against the inner wall of the inner expansion ring 1; next, the length of the fixing post 2012 is slightly longer than the width of the inner expanding ring 1 at the smooth glue line, so that the second baffle 202 is detachably mounted on the fixing post 2012 from the outer wall side of the inner expanding ring 1. The installation mode is as follows: the inner diameter of the round hole 2021 is the same as the outer diameter of the fixing column 2012, and the inner side of the round hole 2021 on the second baffle 202 is provided with an internal thread matched with the external thread on the fixing column 2012, and the second baffle 202 is in threaded connection with the fixing column 2012. After the installation, the bottom plate 2011 of the first baffle 201 and the second baffle 202 are respectively tightly attached to the inner wall and the outer wall of the inner piston ring 1. Moreover, because the through hole 203 is formed inside the first baffle 201, after the installation is completed, the central axis of the through hole 203 is perpendicular to the plane where the inner expansion ring 1 is located, and the central axis of the through hole 203 and the central axis of the round hole 2021 on the second baffle 202 are located on the same straight line, because the top rod 204 is detachably installed in the through hole 203 in the fixed column 2012, when the exhaust is needed, the top rod 204 does not need to be installed, and the gas between the inner wall of the pipeline and the outer wall of the inner expansion ring 1 can be discharged into the pipeline through the round hole 2021 and the through hole 203, so that the gas can be discharged; when the exhaust is not needed, the ejector rod 204 needs to be installed in the through hole 203 of the fixing column 2012, so that the gas channel between the inner side and the outer side of the inner piston ring 1 can be blocked, the gas circulation is avoided, and when the exhaust is needed, the ejector rod 204 is detached again.

Wherein, the connected mode of ejector pin 204 and through-hole 203 also is threaded connection: the inner wall of the through hole 203 is provided with internal threads, and the outer wall of the ejector rod 204 is provided with external threads matched with the internal threads on the inner wall of the through hole 203. The shape of the lift pin 204 is matched with the shape of the through hole 203.

In summary, usually, one exhaust mechanism 2 is installed on the inner piston ring 1, and as shown in fig. 1 and fig. 2, the exhaust mechanism 2 has a small volume, so that the gas between the outer wall of the inner piston ring 1 and the inner wall of the pipeline can be rapidly discharged without hindering the water flow transportation, and a plurality of exhaust mechanisms 2 can be installed, and can be installed according to actual needs. Simultaneously, mutually supporting between the first baffle 201 of exhaust mechanism 2 self, second baffle 202 and the ejector pin 204, when not influencing the leakproofness of inner piston ring 1, not only can discharge the gas that is located between inner piston ring 1 outer wall and the pipeline inner wall fast, exhaust effect is better, moreover, can also hinder new gas to enter into between inner piston ring 1 outer wall and the pipeline inner wall, and sealed effect is better. The arrangement of the exhaust mechanism 2 avoids the problem that the inner expanding ring 1 protrudes to cause water flow transportation blockage when more gas exists between the outer wall of the inner expanding ring 1 and the inner wall of the pipeline during water delivery, reduces water delivery resistance, and prevents the water flow from being blocked, thereby enhancing the water delivery efficiency.

Example 2

The basic structure of the exhaust device applied to the inner expanding ring of the pipeline seal is the same as that of the exhaust device in the embodiment 1, and the differences and the improvements are that: as shown in fig. 8, the ejector rod 204 includes a connecting fixing section 2041, a contracting section 2042, a transition section 2043 and a sealing section 2044 which are connected in sequence; and an external thread is arranged outside the connecting and fixing section 2041 and is matched with an internal thread arranged in the through hole 203.

Since the stem 204 is fitted in the through hole 203, the shape of the through hole 203 conforms to the shape of the stem 204 in order to enhance the sealing property of the exhaust mechanism 2. The connecting and fixing section 2041 is cylindrical and plays a role in connecting and fixing; the contracting section 2042 is in a truncated cone shape and plays a role in changing a gas flow channel, the diameter of the lower bottom surface of the contracting section is the same as that of the connecting and fixing section 2041, and the diameter of the upper bottom surface of the contracting section is smaller than that of the connecting and fixing section 2041; the transition section 2043 is a cylinder with the diameter the same as that of the upper bottom surface of the contraction section 2042, and plays a role in changing a gas flow channel; the sealing section 2044 is also in the shape of a truncated cone, the diameter of the lower bottom surface of the sealing section is the same as that of the transition section 2043, the diameter of the upper bottom surface of the sealing section is smaller than that of the lower bottom surface, and the diameter of the upper bottom surface of the transition section 2043 is larger than that of the gas inlet of the through hole 203. This kind of structural design is for columniform ejector pin 204 structural design, when not using, can directly block up the gas passage of the inside and outside both sides of internal piston ring 1, sealed effect is better relatively to connect fixedly through the great connection canned paragraph 2041 of diameter, make the ejector pin installation back more firm not rock, adopt two round platforms and a cylinder section to pass through simultaneously, change gaseous circulation passageway many times, thereby reduced the possibility of gas circulation, sealing performance is stronger.

In order to further enhance the sealing performance of the exhaust mechanism 2, an annular sealing gasket 2045 is arranged outside the sealing section 2044, correspondingly, an annular sealing gasket 2045 is also arranged at a position, matched with the sealing section 2044, in the through hole 203, and when the exhaust mechanism 2 is not used, the ejector rod 204 is screwed into the through hole 203 for sealing, so that the annular sealing gasket 2045 in the through hole 203 and the annular sealing gasket 2045 on the sealing section 2044 of the ejector rod 204 can be mutually pressed, the sealing performance of the exhaust mechanism 2 can be further enhanced by pressing the double-layer sealing gasket 2045, the possibility of gas circulation is reduced, and new gas can be prevented from entering between the inner wall of the pipeline and the outer wall of the internal expansion ring 1.

Example 3

The basic structure of the exhaust device applied to the inner expanding ring of the pipeline seal is the same as that of the exhaust device in the embodiment 2, and the differences and the improvements are that: as shown in fig. 3 and 6, a corrugated groove 3 is formed in a surface of the first baffle 201, which abuts against an inner wall of the inner piston ring 1, after the installation is completed, the second baffle 202 is screwed on the fixing column 2012, so that mutual force among the first baffle 201, the second baffle 202 and the inner piston ring 1 is increased, and meanwhile, the corrugated groove 3 can further enhance the stability of the exhaust mechanism 2, so that the connection between the first baffle 201 and the inner piston ring 1 is more stable.

Example 4

The basic structure of the exhaust device applied to the inner expanding ring of the pipeline seal is the same as that of the exhaust device in the embodiment 3, and the differences and the improvements are that: as shown in fig. 3, 4 and 6, a long groove 206 is formed at the top of the fixing column 2012, so that the gas between the inner piston ring 1 and the pipeline is guided to enter the through hole 203 through the long groove 206 and then is discharged.

Example 5

The basic structure of the exhaust device applied to the inner expanding ring of the pipeline seal is the same as that of the exhaust device in the embodiment 4, and the differences and the improvements are that: as shown in fig. 4, 6 and 7, the second baffle 202 is provided with a plurality of small holes 207, and the small holes 207 are provided, because the air exhaust mode adopts manual extrusion air exhaust, a small amount of air remained between the inner wall of the pipeline and the outer wall of the inner expansion ring 1 is inevitably not exhausted, and therefore, the small holes 207 can play a certain air storage function.

During water flow transportation, the plurality of small holes 207 are formed in the second baffle 202 of the exhaust mechanism 2, so that residual gas between the inner wall of the pipeline and the outer wall of the inner expansion ring 1 can be completely extruded into the small holes 207 for storage during water flow transportation, and the inner expansion ring 1 is prevented from protruding towards the inside of the pipeline due to the residual gas between the inner wall of the pipeline and the outer wall of the inner expansion ring 1.

Example 6

The basic structure of the exhaust device applied to the inner expanding ring of the pipeline seal is the same as that of the exhaust device in the embodiment 5, and the differences and the improvements are that: as shown in fig. 3, 5, 7 and 8, the lower end of the ejector rod 204 is provided with a hexagonal hole 205, and the hexagonal hole 205 can facilitate the detachment and installation of the ejector rod 204 due to the threaded connection between the ejector rod 204 and the through hole 203.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims (8)

1. The utility model provides an exhaust apparatus who is applied to on sealed inner expanding ring of pipeline, inner expanding ring (1) are the attached pipeline inner wall that is fixed in of girdle shape when using, its characterized in that: the exhaust device comprises an exhaust mechanism (2), wherein the exhaust mechanism (2) comprises a first baffle plate (201) and a second baffle plate (202), a through hole (203) is formed in the first baffle plate (201), and a round hole (2021) is formed in the center of the second baffle plate (202); the first baffle (201) and the second baffle (202) are detachably connected to the inner wall surface and the outer wall surface of the inner piston ring (1); a top rod (204) is detachably mounted in the through hole (203), and the shape of the through hole (203) is matched with that of the top rod (204); the round hole (2021) is communicated with the through hole (203).

2. The exhaust device applied to the inner expanding ring of the pipeline seal, as claimed in claim 1, wherein: the first baffle (201) comprises a bottom plate (2011) and fixing columns (2012), and the second baffle (202) is detachably mounted on the fixing columns (2012).

3. The exhaust device applied to the inner expanding ring of the pipeline seal, as claimed in claim 2, wherein: the inner diameter of the round hole (2021) is the same as the outer diameter of the fixing column (2012), an external thread is arranged on the outer wall of the fixing column (2012), an internal thread is arranged on the inner side of the round hole (2021), and the internal thread on the inner side of the round hole (2021) is matched with the external thread on the fixing column (2012).

4. The exhaust device applied to the inner expanding ring of the pipeline seal, which is characterized in that: one surface of the first baffle (201) which is abutted against the inner wall of the inner piston ring (1) is provided with a corrugated groove (3).

5. The exhaust device applied to the inner expanding ring of the pipeline seal, as claimed in claim 4, wherein: the top of the fixing column (2012) is provided with an elongated slot (206).

6. The exhaust device applied to the inner expanding ring of the pipeline seal, as claimed in claim 1, wherein: the inner wall of the through hole (203) is provided with internal threads, and the outer wall of the ejector rod (204) is provided with external threads matched with the internal threads on the inner wall of the through hole (203).

7. The exhaust device applied to the inner expanding ring of the pipeline seal as claimed in claim 6, wherein: the ejector rod (204) comprises a connecting fixed section (2041), a contraction section (2042), a transition section (2043) and a sealing section (2044) which are connected in sequence; external threads are arranged outside the connecting and fixing section (2041), and an annular sealing gasket (2045) is arranged outside the sealing section (2044).

8. The exhaust apparatus applied to the inner expanding ring of the pipeline sealing as claimed in any one of claims 1 to 7, wherein: the second baffle (202) is provided with a small hole (207).

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