CN212664423U

CN212664423U - Pipeline dredging device

Info

Publication number: CN212664423U
Application number: CN202020541315.8U
Authority: CN
Inventors: 龚文; 韩杰; 王进旭
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2021-03-09
Anticipated expiration: 2030-04-14

Abstract

The utility model provides a pipeline dredger, including dredging assembly and seal assembly, the seal assembly is connected with the end seal of the pipeline, and the seal assembly has the intercommunicating pore, the dredging assembly includes the body of rod and at least one scraping part arranged on the body of rod, the body of rod is worn to be arranged in the intercommunicating pore, the both ends of the body of rod are respectively located the inside and outside of the pipeline; the scraping part is positioned in the pipeline, and the rod body can drive the scraping part to rotate and move in the pipeline, so that the pipeline dredging effect is achieved. The utility model discloses a medium splash to the staff in the pipeline has been avoided to the pipeline dredge on one's body, has eliminated the potential safety hazard of dredging pipeline in-process.

Description

Pipeline dredging device

Technical Field

The utility model relates to a pipeline engineering field especially relates to a pipeline dredge.

Background

In petrochemical enterprises, a pressure pipeline is a special device, and compared with other special devices, the pressure pipeline has the advantages of large length-diameter ratio, high instability, complex fluid flowing state in the pipeline, small buffer space and high working condition change frequency. Because chemical enterprises' equipment operating cycle is longer, and guide shower valve or atmospheric valve most are located the low point of piping installation, and are in the closed condition usually, and equipment long-time operation back impurity can deposit pipeline or valve port before the valve, causes the pipeline to block up, consequently need regularly open guide shower valve or atmospheric valve, clears away the deposit impurity in the equipment.

Among the prior art, when the atmospheric valve is blockked up appearing, the mediation mode of taking is for opening the valve after, and the pipeline that blocks up is stretched into to artifical instrument such as iron wire or drill rod and is dredged, stirs accumulational impurity in the valve pipe of atmospheric valve repeatedly through instruments such as iron wire or drill rod, drives impurity and slowly flows from the valve opening.

However, for some pipelines carrying high-temperature, high-pressure, corrosive or toxic media, if the pipelines are dredged in the above manner, the media in the pipelines can easily splash onto operators during the dredging process, and the personal safety can be seriously threatened.

SUMMERY OF THE UTILITY MODEL

The utility model provides a pipeline dredge has avoided the medium in the pipeline to splash the staff on one's body, has eliminated the potential safety hazard of dredging pipe in-process.

The utility model provides a pair of pipeline dredge, including mediation subassembly and seal assembly, the seal assembly is connected with the tip sealing of pipeline, and seal assembly has the intercommunicating pore.

The dredging component comprises a rod body and at least one scraping part arranged on the rod body, the rod body is arranged in the communicating hole in a penetrating mode, and two ends of the rod body are located inside and outside the pipeline respectively; the scraping part is positioned in the pipeline, and the rod body can drive the scraping part to rotate and move in the pipeline so as to dredge the pipeline.

As an optional mode, the utility model provides a pair of pipeline dredge, scraping portion are a plurality of, and set up the different positions of body of rod upwards week.

As an optional mode, the utility model provides a pair of pipeline dredge, scraping portion are the scraper blade of arranging in body of rod outer wall.

As an optional mode, the utility model provides a pair of pipeline dredge, the face direction perpendicular to body of rod outer wall of scraper blade.

As an optional mode, the utility model provides a pair of pipeline dredge, the distance that the scraper blade is located between the inside tip of pipeline with the body of rod is less than the distance that the scraper blade is located between the outside tip of pipeline with the body of rod.

As an optional mode, the utility model provides a pair of pipeline dredge, the one end that the mediation subassembly deviates from the pipeline still is provided with the hand wheel.

As an optional mode, the utility model provides a pair of pipeline dredge, seal assembly include flange and seal shell, the end connection of flange and pipeline, and seal shell sets up on the flange, and seal shell has first through-hole, and the centre bore of first through-hole and flange link up mutually and form the intercommunicating pore.

As an optional mode, the utility model provides a pair of pipeline dredge has the convex spacing arch to first through-hole center on the inner wall of first through-hole, and the body of rod supports on spacing arch.

As an optional mode, the utility model provides a pair of pipeline dredge, the one end that sealed casing deviates from the pipeline has the holding chamber, and holding chamber and first through-hole link up, and the holding intracavity packing has the filler that is used for clearance between the sealed body of rod and the intercommunicating pore.

As an optional mode, the utility model provides a pipeline dredger, the sealing assembly further comprises a sealing cover, the sealing cover is provided with a second through hole; the end of the accommodating cavity, which is away from the pipeline, is provided with an opening, the sealing cover is covered on the opening, and the first through hole and the second through hole are communicated with each other.

The utility model provides a pipeline dredger, including dredging assembly and seal assembly, the seal assembly is connected with the end seal of the pipeline, and the seal assembly has the intercommunicating pore, the dredging assembly includes the body of rod and at least one scraping part arranged on the body of rod, the body of rod is worn to be arranged in the intercommunicating pore, the both ends of the body of rod are respectively located the inside and outside of the pipeline; the scraping part is positioned in the pipeline, and the rod body can drive the scraping part to rotate and move in the pipeline, so that the pipeline dredging effect is achieved. Will the utility model discloses a pipeline dredge installs the valve port at the atmospheric valve of pipeline or lead the shower valve, dredges the operation to the valve pipe under the condition of sealing the valve port, has avoided the medium splash in the pipeline to the staff on one's body, has eliminated the potential safety hazard of dredging the pipeline in-process.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required to be used in the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is an external view schematically illustrating a pipe dredger according to an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of a pipeline dredger according to an embodiment of the present application;

FIG. 3 is an exploded view of a pipe dredger according to an embodiment of the present application;

FIG. 4 is a schematic cross-sectional view of a flange of a pipe dredger according to an embodiment of the present application;

FIG. 5 is a schematic cross-sectional view of a seal housing of a pipe dredger according to an embodiment of the present application;

fig. 6 is an appearance schematic diagram of a sealing cover of a pipeline dredger according to an embodiment of the application.

Description of reference numerals:

1-pipeline dredge;

10-a dredging component;

101-a rod body;

102-a scraping section;

103-hand wheel;

11-a sealing assembly;

111-communicating holes;

112-a flange;

1121-central hole;

113-a sealed housing;

1131 — a first via;

1132-limit projection;

1133, a containing cavity;

114-a sealing cover;

1141-a second via;

115-a filler;

116-a first bolt;

117-a nut;

118-a second bolt;

2-pipeline.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.

First of all, it should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications.

Next, it should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "inside", "outside", and the like are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that a device or member must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In petrochemical enterprises, a pressure pipeline is a special device, and compared with other special devices, the pressure pipeline has the advantages of large length-diameter ratio, high instability, complex fluid flowing state in the pipeline, small buffer space and high working condition change frequency. The pressure pipeline components and the supporting parts are various in types, large in quantity, long in service time, and multiple in links such as design, manufacture, installation, inspection, maintenance and the like, and a guide shower valve and an air release valve are arranged on the pipeline and used for discharging media in the pipeline during inspection and maintenance. The medium in the pipeline of the petrochemical enterprise is often inflammable, explosive or toxic, and once leakage occurs, accidents such as explosion, poisoning and the like can be caused. Because chemical enterprises' equipment operating cycle is longer, and the lead shower valve or atmospheric valve most are located the low point of equipment, and are in the closed condition usually, and equipment long-time operation back impurity can deposit pipeline or valve port before the valve, causes the pipeline to block up, consequently need regularly open lead shower valve or atmospheric valve, clears away the deposit impurity in the equipment. Among the prior art, when the atmospheric valve is blockked up appearing, the mediation mode of taking is for opening the valve after, and the pipeline that blocks up is stretched into to artifical instrument such as iron wire or drill rod and is dredged, stirs accumulational impurity in the valve pipe of atmospheric valve repeatedly through instruments such as iron wire or drill rod, drives impurity and slowly flows from the valve opening. However, for some pipelines carrying high-temperature, high-pressure, corrosive or toxic media, if the pipelines are dredged in the above manner, the media in the pipelines can easily splash onto operators during the dredging process, and the personal safety can be seriously threatened.

In order to solve the problem, the embodiment of the utility model provides a pipeline dredge to avoid the medium in the pipeline to splash to the staff on one's body, thereby eliminate the potential safety hazard of dredging pipeline in-process. The structure of the pipe dredger according to the embodiment of the present invention will be described in detail below.

Fig. 1 is an external view schematically illustrating a pipeline dredger according to an embodiment of the present application; FIG. 2 is a schematic cross-sectional view of a pipeline dredger according to an embodiment of the present application; FIG. 3 is an exploded view of a pipe dredger according to an embodiment of the present application; FIG. 4 is a schematic cross-sectional view of a flange of a pipe dredger according to an embodiment of the present application; FIG. 5 is a schematic cross-sectional view of a seal housing of a pipe dredger according to an embodiment of the present application; fig. 6 is an appearance schematic diagram of a sealing cover of a pipeline dredger according to an embodiment of the application. As shown in fig. 1 to 6, the present embodiment provides a pipeline dredger 1, which comprises a dredging assembly 10 and a sealing assembly 11, wherein the sealing assembly 11 is connected with the end of a pipeline 2 in a sealing way, and the sealing assembly 11 is provided with a communication hole 111.

The dredging component comprises a rod body 101 and at least one scraping part 102 arranged on the rod body 101, the rod body 101 penetrates through the communicating hole 111, and two ends of the rod body 101 are respectively positioned inside and outside the pipeline 2; the scraping portion 102 is located in the pipe 2, and the rod 101 can drive the scraping portion 102 to rotate and move in the pipe 2, so as to dredge the pipe 2.

Specifically, seal assembly 11 can dismantle with pipeline 2 and be connected to realize dismantling of pipeline dredge 1 and pipeline 2 and be connected, when needs dredge pipeline 2, open pipeline 2's opening, install pipeline dredge 2 on pipeline 2's opening, the installation is accomplished the back, and pipeline 2's opening is sealed by seal assembly 11, and the one end of the body of rod 101 is located pipeline 2's inside, and the other end is located pipeline 2's outside simultaneously.

Alternatively, the seal assembly 11 and the pipe 2 may be bolted or otherwise attached using threaded fasteners.

Optionally, the rod 101 is driven by external power to be located at one end outside the pipeline 2, so that the rotation and movement of the part of the rod 101 inside the pipeline 2 can be realized, and the external power can be manual power or a power source capable of realizing directional linear motion or rotational motion, such as a motor, a cylinder and the like.

Alternatively, the rod 101 is engaged with the sealing assembly 11 by passing through the communication hole 111, that is, the sealing assembly 11 is sleeved on the rod 101, the sealing assembly 11 is fixed relative to the pipe 2, and the rod 101 moves and rotates relative to the pipe 2 and the sealing assembly 11.

Alternatively, the bottom of the end of the rod 101 facing the pipe 2 may be designed to be a cone-shaped structure, so that the rod 101 can be pushed open and pass through impurities more smoothly when being inserted into the pipe 2.

Optionally, the material of the rod body 101 is selected from metal materials, including but not limited to iron, aluminum, copper, and the like, or alloys of the above metals, and the surface of the rod body 101 may be subjected to corrosion protection treatment, such as electroplating, blackening, and the like, so as to improve the corrosion resistance of the rod body 101.

As an alternative mode, the present invention provides a pipe dredger, wherein the scraping portion 102 is plural and is disposed at different positions in the circumferential direction of the rod body 101.

Optionally, after the scraping portion 102 is connected to the rod 101, the width of the whole body perpendicular to the axial direction of the rod 101 is smaller than the inner diameter of the pipe 2, so as to ensure that the end of the rod 101 provided with the scraping portion 102 can extend into the pipe 2.

It should be noted that, in order to ensure that the scraping portion 102 can scrape off as much impurities on the inner wall of the pipe 2 as possible, the width of the scraping portion 102 perpendicular to the axial direction of the rod 101 should be as large as possible while ensuring that the scraping portion 102 can enter the pipe 2.

Optionally, the scraping portion 102 is a scraper disposed on the outer wall of the rod body 101, the surface direction of the scraper is perpendicular to the outer wall of the rod body 101, and the scraper may be welded on the rod body 101, or the scraper may be detachably connected to the rod body 101.

Alternatively, the material of the scraper blade can be metal or plastic, the metal includes but is not limited to iron, aluminum and other metals or alloys thereof which are subjected to corrosion-resistant surface treatment, and the plastic includes engineering plastics with strong corrosion resistance, such as polytetrafluoroethylene.

Optionally, the scraping portion 102 may also be a brush disposed on an outer wall of the rod 101, a bristle direction of the brush is perpendicular to the outer wall of the rod 101, the bristles may be disposed on a brush base, and the brush base may be welded to the rod 101 or detachably connected to the rod. In addition, the scraping portion 102 may have other structures or forms, such as various flexible or rigid scraping structures or scraping members, which are not described herein.

It should be noted that, according to the type of the impurities or media to be removed inside the pipe 2, different design schemes of the scraping portion 102 may be selected, for example, if the thickness of the deposited impurities is large or the viscosity of the impurities is large, a scraper may be selected as the scraping portion 102, so that a good cleaning effect is achieved; if the impurity deposition amount is less, only when changing the pipeline medium, need accomplish the cleaning work, can select other structures or form to scrape off portion 102, more laborsaving smooth and easy when using.

Optionally, the distance between the scraping part 102 and the end of the rod 101 inside the pipe 2 is smaller than the distance between the scraping part 102 and the end of the rod 101 outside the pipe 2, so that the dredging assembly 10 has a certain movement space, and the scraping part 102 is always inside the pipe 2, so that the scraping part 102 can clean impurities at different positions inside the pipe 2 as much as possible.

Optionally, one end of the dredging component 10, which is away from the pipeline 2, is further provided with a hand wheel 103, and when the pipeline dredging device 1 is manually operated, the hand wheel 103 can be held to control the movement of the dredging component 10, so that the dredging component 10 is more labor-saving when being rotated, and the hand wheel 103 can be welded on the rod body 101 or connected with the rod body 101 in a detachable manner.

Optionally, an L-shaped rod may be further disposed at an end of the dredging assembly 10 away from the pipeline 2, and the end of the dredging assembly 10 held by a hand may also be rotated. It should be noted that, the hand wheel 103 and the L-shaped rod both reduce the force required for holding the end by the hand by extending the arm of force, so that different structural manners adopting the above principle can be applied to the present embodiment, which are not illustrated here.

As an optional mode, the utility model provides a pair of pipeline dredge, seal assembly 11 includes flange 112 and sealed casing 113, flange 112 and the end connection of pipeline 2, sealed casing 113 sets up on flange 112, and sealed casing 113 has first through-hole 1131, and first through-hole 1131 and the centre bore 1121 of flange 112 link up mutually and form intercommunicating pore 111.

Specifically, when the flange 112 is connected with the end of the pipeline 2, the opening of the pipeline 2 is sealed, so that impurities are prevented from being sprayed out of the pipeline 2 in the dredging process, and the sealing assembly 11 is connected with the pipeline 2 through the sealing connection of the flange 112 and the port of the pipeline 2; the rod 101 passes through the communication hole 111, that is, the rod 101 passes through the first through hole 1131 and the central hole 1121 of the flange 112 in turn, by passing through the communication hole 111, the end of the dredging assembly 10 having the scraping part 102 enters the inside of the pipe 2, and the end of the dredging assembly 10 having the hand wheel 103 remains outside the pipe 2.

Alternatively, the axes of the first through hole 1131, the center hole 1121, and the communication hole 111 are all collinear.

Optionally, the flange 112 may be connected to the end of the pipeline 2 by bolts, a protruding structure may be provided towards one end of the pipeline 2, a plurality of through holes may be circumferentially and uniformly distributed on the protruding structure, and the flange 112 is fixed to the end of the pipeline 2 by bolts passing through the through holes and being screwed to the mounting holes on the pipeline 2.

Optionally, a limiting protrusion 1132 protruding toward the center of the first through hole 1131 is arranged on the inner wall of the first through hole 1131, the rod body 101 is supported on the limiting protrusion 1132, the rod body 101 is in clearance fit with the sealing shell 113 at the position of the limiting protrusion 1132, and the nominal diameter of the hole part formed by the limiting protrusion 1132 is equal to the nominal diameter of the rod body 101. While the rod body 101 can pass through the first through hole 1131, the linear motion of the rod body 101 in the axial direction is relatively stable, and the rod body is prevented from moving in the direction perpendicular to the axial line.

Optionally, the flange 112 and the sealing shell 113 may be connected by a first bolt 116 and a nut 117, a circumferential boss may be disposed at an end of the flange 112 facing away from the pipe 2, a through hole into which the first bolt 116 may be inserted may be disposed on a surface of the circumferential boss, and the through hole may be multiple and axially distributed on the surface of the boss; similarly, a circumferential boss may be provided at an end of the seal housing 113 facing the pipe 2, and a surface of the circumferential boss is provided with a through hole for inserting the first bolt 116, and the through hole may be plural and axially distributed on the boss surface. The through holes on the flange 112 at the end departing from the pipeline 2 correspond to the through holes on the sealing shell 113 at the end facing the pipeline 2 one by one, and have the same diameter, and the first bolts 116 sequentially pass through the through holes on the flange 112 at the end departing from the pipeline 2 and the through holes on the sealing shell 113 at the end facing the pipeline 2, and are screwed and matched with the nuts 117, so that the flange 112 is fixedly connected with the sealing shell 113.

Specifically, one end of the sealing shell 113 facing away from the pipe 2 has an accommodating cavity 1133, the accommodating cavity 1133 is communicated with the first through hole 1131, and the accommodating cavity 1133 is filled with a filler 115 for sealing a gap between the rod body 101 and the through hole 111.

Optionally, the space formed by the accommodating cavity 1133 is cylindrical, and the inner diameter of the accommodating cavity 1133 is greater than the diameter of the rod 101, so as to ensure that when the rod 101 passes through the accommodating cavity 1133, a certain distance is formed between the inner wall of the accommodating cavity 1133 and the outer wall of the rod 101, and thus a certain accommodating space is generated to place the filler 115.

Optionally, the filler 115 fills the accommodating space between the accommodating cavity 1133 and the rod 101, the filler 115 plays a role of expanding the rod 101 to generate a certain pressure on the outer wall of the rod 101, and the rod 101 generates sliding friction with the filler 115 when moving along the axis and rotating around the axis, so that when the rod 101 is pulled in a direction away from the pipeline 2, the filler 115 can scrape out impurities on the outer wall of the end of the rod 101 in the pipeline, and the rod 101 is prevented from bringing out the impurities to cause damage.

Alternatively, the filler 115 may be a single-piece or granular filler, the material of the filler 115 may be rubber, sponge, elastic plastic, or the like, any one of the above materials may be used if the filler 115 is a single-piece, or a mixture of any one or more of the above materials may be used if the filler 115 is a granular filler.

Optionally, the flange 112 and the sealing housing 113 may also be manufactured as an integral component, but the specific structural features are the same as those of the two manufactured components, and are not described herein again.

As an optional mode, in the pipe dredger 1 provided by the present invention, the sealing assembly 11 further includes a sealing cover 114, and the sealing cover 114 has a second through hole 1141; the end of the accommodating cavity 1133 away from the pipe 2 has an opening, the sealing cover 114 covers the opening, and the first through hole 1131 and the second through hole 1141 are communicated with each other.

Specifically, the sealing cover 114 is detachably connected to an end of the sealing housing 113 away from the pipe 2, and axes of the first through hole 1131, the second through hole 1141, and the central hole 1121 are on the same straight line. In order to prevent impurities in the pipeline from flowing out from the clearance between the parts inside the pipeline dredger 1, the nominal diameter of the second through hole 1141 may be equal to the nominal diameter of the rod body 101, and the sealing cover 114 is in clearance fit with the rod body 101.

Optionally, the sealing cover 114 and the sealing shell 113 may be connected by bolts, a plurality of circumferentially uniformly distributed threaded holes are formed in the abutting end surfaces of the sealing shell 113 and the sealing cover 114, a plurality of circumferentially uniformly distributed through holes are formed in the surface of the sealing cover 114, the threaded holes and the through holes correspond to each other one to one, and the second bolt 118 penetrates through the through hole in the surface of the sealing cover 114 and is screwed with the threaded hole in the end of the sealing shell 113 away from the pipeline 2, so that the sealing cover 114 and the sealing shell 113 are hermetically connected.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. The pipeline dredger is characterized by comprising a dredging component and a sealing component, wherein the sealing component is connected with the end part of a pipeline in a sealing way and is provided with a communication hole;

2. The pipeline dredger according to claim 1, wherein the scraping portion is provided in plurality and at different positions in a circumferential direction of the rod body.

3. The pipeline dredger according to claim 2, wherein the scraping portion is a scraper arranged on an outer wall of the rod body.

4. The pipeline dredger according to claim 3, wherein the plate surface direction of the scraper is perpendicular to the outer wall of the rod body.

5. A pipeline dredge according to claim 3 or 4, wherein the distance between the scraper and the end of the rod inside the pipeline is less than the distance between the scraper and the end of the rod outside the pipeline.

6. A pipeline dredger according to any one of claims 1-4, wherein the end of the dredging assembly facing away from the pipeline is further provided with a hand wheel.

7. A pipeline dredger according to any one of claims 1-4, wherein the sealing assembly comprises a flange connected to an end of the pipeline, and a sealing housing provided on the flange and having a first through hole communicating with the central hole of the flange and forming the communication hole.

8. The pipeline dredger according to claim 7, wherein the inner wall of the first through hole is provided with a limiting protrusion protruding towards the center of the first through hole, and the rod body is supported on the limiting protrusion.

9. The pipeline dredger according to claim 7, wherein an end of the sealing housing facing away from the pipeline is provided with an accommodating cavity, the accommodating cavity is communicated with the first through hole, and a filler for sealing a gap between the rod body and the communication hole is filled in the accommodating cavity.

10. The dredger of claim 9, wherein the sealing assembly further comprises a sealing cap, the sealing cap having a second through hole; the end, deviating from the pipeline, of the accommodating cavity is provided with an opening, the sealing cover covers the opening, and the first through hole is communicated with the second through hole.