阅读说明：本技术 一种全压高速排气阀 (Full-pressure high-speed exhaust valve ) 是由 刘永 龚高石 张雪 刘庆 于 2021-01-11 设计创作，主要内容包括：本发明涉及管道领域,公开一种全压高速排气阀。管道内的气体被水挤入第一腔室中,大部分气体由第一排气口排出,少部分气体经由第三排气口进入上腔室,由于导向套与触发杆间隙配合,仅有微量气体从上腔室溢出,随着上腔室的气体变多,膜片在上腔室内气体的气压作用下带动空心杆向下滑动,以使密封板保持打开第一排气口的状态,保证管道充水阶段大量气体经由第一排气口排出,避免爆管影响正常供水、流量计失准等情况。本发明提供的全压高速排气阀,实现了在管道充水全过程既能大量排气又能持续微量排气,并且无需配置旁通控制管路。(The invention relates to the field of pipelines and discloses a full-pressure high-speed exhaust valve. The gaseous by water in the pipeline is crowded into first cavity, most of gas is discharged by first gas vent, cavity on the entering of few part gas via the third gas vent, because uide bushing and trigger bar clearance fit, only trace gas spills over from the last cavity, along with the gas of last cavity becomes many, the diaphragm drives hollow rod lapse under the atmospheric pressure effect of last cavity internal gas, so that the state of first gas vent is kept opening to the closing plate, guarantee that a large amount of gas of pipeline water filling stage are discharged via first gas vent, avoid the pipe explosion to influence normal water supply, the condition such as the flowmeter is out of alignment. The full-pressure high-speed exhaust valve provided by the invention realizes that a large amount of exhaust and continuous trace amount of exhaust can be realized in the whole process of water filling of a pipeline, and a bypass control pipeline is not required to be configured.)

1. A full pressure high speed exhaust valve, comprising:

a valve body (1);

the valve cover (2) is connected with the valve body (1), the valve cover (2) and the valve body (1) form a first cavity (21), and a first exhaust port (22) communicated with the outside is formed in the valve cover (2);

the gland (3) is connected with the valve cover (2), the gland (3) and the valve cover (2) form a second chamber (31), a guide sleeve (32) is arranged in the gland (3), and a second exhaust port (33) communicated with the outside is arranged on the gland (3);

the switching assembly (4) comprises a hollow rod (41), a sealing plate (42) and a diaphragm (43), the sealing plate (42) is arranged in the first cavity (21) and used for blocking the first exhaust port (22), the diaphragm (43) is arranged in the second cavity (31) and divides the second cavity (31) into an upper cavity (311) and a lower cavity (312) communicated with the outside, the hollow rod (41) is arranged on the valve cover (2) in a sliding mode, one end of the hollow rod (41) is connected with the sealing plate (42), the other end of the hollow rod (41) is connected with the diaphragm (43), and a third exhaust port (411) communicated with the upper cavity (311) is arranged at the end, extending into the first cavity (21), of the hollow rod (41);

the trigger assembly (5) comprises a floating body (51) and a trigger rod (52) which are connected, the floating body (51) is arranged in the first chamber (21), the trigger rod (52) movably penetrates through the hollow rod (41) and is in sliding connection with the guide sleeve (32), the floating body (51) can float up to block the third exhaust port (411) and drive the trigger rod (52) to slide in the guide sleeve (32) so as to conduct the upper chamber (311) and the second exhaust port (33).

2. The full-pressure high-speed exhaust valve according to claim 1, wherein a first channel (321), a central hole (322) and a second channel (323) are provided on the guide sleeve (32), one end of the first channel (321) communicates with the upper chamber (311), the other end of the first channel (321) communicates with the central hole (322), one end of the second channel (323) communicates with the central hole (322), the other end of the second channel (323) communicates with the second exhaust port (33), the trigger rod (52) movably penetrates through the central hole (322), a conducting groove (521) is provided on the trigger rod (52), when the trigger rod (52) slides in the central hole (322) to a preset position, the conducting groove (521) can conduct the first channel (321) and the second channel (323), to communicate the upper chamber (311) and the second exhaust port (33).

3. The full pressure high speed exhaust valve according to claim 2 wherein the first passage (321) includes a first axial hole (3211) and a first radial hole (3212) in communication, the second passage (323) includes a second radial hole (3231) and a second axial hole (3232) in communication, the first axial hole (3211) communicates with the upper chamber (311), the first radial hole (3212) and the second radial hole (3231) open oppositely on a sidewall of the central hole (322), and the second axial hole (3232) communicates with the second exhaust port (33).

4. The full pressure high speed exhaust valve according to claim 1 characterized in that the valve cover (2) is provided with a third chamber (23), the first exhaust port (22) communicates the first chamber (21) and the third chamber (23), and the third chamber (23) communicates with the outside.

5. The full-pressure high-speed exhaust valve according to claim 1, wherein an upper pressure plate (44) and a lower pressure plate (45) are arranged on the hollow rod (41), and the diaphragm (43) is clamped between the upper pressure plate (44) and the lower pressure plate (45).

6. The full pressure high speed exhaust valve according to claim 1 wherein the side of the sealing plate (42) facing the first exhaust port (22) is provided with an annular rubber ring (421).

7. The full-pressure high-speed exhaust valve according to claim 1, characterized in that a blocking part (511) is arranged on the floating body (51), and a sealing ring (412) is arranged between the blocking part (511) and the third exhaust port (411).

8. Full-pressure high-speed exhaust valve according to claim 1, characterized in that a bracket (11) is arranged in the valve body (1), the float (51) being capable of abutting against the bracket (11).

9. The full-pressure high-speed exhaust valve according to claim 1, characterized in that an inlet (12) is arranged on the valve body (1), the inlet (12) is communicated with the first chamber (21), and a filter cover (13) is arranged between the inlet (12) and the first chamber (21).

10. The full-pressure high-speed exhaust valve according to any one of claims 1 to 9, characterized in that the valve body (1) is provided with a water outlet and a plug (14), and the plug (14) is used for plugging the water outlet.

Technical Field

The invention relates to the field of pipelines, in particular to a full-pressure high-speed exhaust valve.

Background

The exhaust valve is mainly used for exhausting gas in the pipeline and supplementing gas when the pipeline forms negative pressure, so that the safety of a pipe network is protected. The existing exhaust valve mostly has closing pressure difference, namely, when the pipeline pressure is large, large pressure difference is formed at the exhaust port, so that the floating body rises to close the main exhaust port, gas in the pipeline cannot be completely removed, and hidden dangers such as normal water supply is influenced by pipe explosion, and inaccurate metering of a flowmeter is caused. There is also a full pressure vent valve, but there is an external bypass line that can be disabled once the bypass line is damaged.

Disclosure of Invention

Based on the above problems, the present invention provides a full-pressure high-speed exhaust valve, which can exhaust a large amount of air and continuously exhaust a small amount of air in the whole process of water filling in a pipeline, and does not need to be provided with a bypass control pipeline.

In order to achieve the purpose, the invention adopts the following technical scheme:

a full pressure high speed vent valve comprising:

a valve body;

the valve cover is connected with the valve body, a first cavity is formed by the valve cover and the valve body, and a first exhaust port communicated with the outside is formed in the valve cover;

the gland is connected with the valve cover, a second cavity is formed by the gland and the valve cover, a guide sleeve is arranged in the gland, and a second exhaust port communicated with the outside is arranged on the gland;

the switching assembly comprises a hollow rod, a sealing plate and a diaphragm, the sealing plate is arranged in the first cavity and used for blocking the first exhaust port, the diaphragm is arranged in the second cavity and divides the second cavity into an upper cavity and a lower cavity communicated with the outside, the hollow rod is arranged on the valve cover in a sliding mode, one end of the hollow rod is connected with the sealing plate, the other end of the hollow rod is connected with the diaphragm, and a third exhaust port communicated with the upper cavity is formed in the end, extending into the first cavity, of the hollow rod;

the trigger assembly comprises a floating body and a trigger rod which are connected, the floating body is arranged in the first cavity, the trigger rod movably penetrates through the hollow rod and is in sliding connection with the guide sleeve, the floating body can float to block the third exhaust port and drive the trigger rod to slide in the guide sleeve so as to conduct the upper cavity and the second exhaust port.

As a preferable scheme of the full-pressure high-speed exhaust valve of the invention, the guide sleeve is provided with a first channel, a central hole and a second channel, one end of the first channel is communicated with the upper chamber, the other end of the first channel is communicated with the central hole, one end of the second channel is communicated with the central hole, the other end of the second channel is communicated with the second exhaust port, the trigger rod movably penetrates through the central hole, the trigger rod is provided with a conduction groove, and when the trigger rod slides to a preset position in the central hole, the conduction groove can conduct the first channel and the second channel to conduct the upper chamber and the second exhaust port.

As a preferable aspect of the full-pressure high-speed exhaust valve of the present invention, the first passage includes a first axial hole and a first radial hole that are communicated with each other, the second passage includes a second radial hole and a second axial hole that are communicated with each other, the first axial hole is communicated with the upper chamber, the first radial hole and the second radial hole are oppositely opened on a side wall of the central hole, and the second axial hole is communicated with the second exhaust port.

As a preferable scheme of the full-pressure high-speed exhaust valve of the present invention, the valve cover is provided with a third chamber, the first exhaust port communicates the first chamber and the third chamber, and the third chamber communicates with the outside.

As a preferred scheme of the full-pressure high-speed exhaust valve, an upper pressure plate and a lower pressure plate are arranged on the hollow rod, and the diaphragm is clamped between the upper pressure plate and the lower pressure plate.

In a preferred embodiment of the full-pressure high-speed exhaust valve according to the present invention, an annular rubber ring is provided on a side of the sealing plate facing the first exhaust port.

In a preferred embodiment of the full-pressure high-speed exhaust valve according to the present invention, the floating body is provided with a stopper, and a seal ring is provided between the stopper and the third exhaust port.

In a preferred embodiment of the full-pressure high-speed exhaust valve according to the present invention, a support is disposed in the valve body, and the floating body can abut against the support.

As a preferable scheme of the full-pressure high-speed exhaust valve, an inlet is arranged on the valve body, the inlet is communicated with the first chamber, and a filter cover is arranged between the inlet and the first chamber.

As a preferred scheme of the full-pressure high-speed exhaust valve, a water outlet and a plug are arranged on the valve body, and the plug is used for plugging the water outlet.

The invention has the beneficial effects that:

according to the full-pressure high-speed exhaust valve provided by the invention, in the stage of water filling of a pipeline, the sealing plate and the first exhaust port are in a separated state, the floating body sinks to be separated from the third exhaust port due to the self gravity, gas in the pipeline is squeezed into the first chamber by water, most of the gas is exhausted by the first exhaust port, and a small part of the gas enters the upper chamber through the third exhaust port; when the gas in the pipeline is exhausted, the water in the pipeline gradually enters the first cavity, the floating body floats upwards under the buoyancy action of the water to block the third exhaust port and drives the trigger rod to slide in the guide sleeve to conduct the upper cavity and the second exhaust port, the gas in the upper cavity is exhausted through the second exhaust port, the air pressure applied to the diaphragm is reduced, and meanwhile, the sealing plate moves upwards to block the first exhaust port under the buoyancy action of the water in the first cavity and the air pressure action of the gas and pushes the diaphragm to exhaust the gas from the upper cavity through the second exhaust port through the hollow rod; along with the aquatic gas is appeared gradually, gas gathers in the top of first cavity gradually, the liquid level of first cavity internal water descends gradually, when the liquid level of first cavity internal water descends to the buoyancy that the body received is less than self gravity, the body sinks to and breaks away from with the third gas vent, a little air at first cavity top gets into the upper chamber via the third gas vent and discharges via the second gas vent, after the gas discharge, the liquid level of first cavity internal water rises, the body floats to shutoff third gas vent under the buoyancy of water once more, go round and go round again, until the unnecessary gas in the pipeline exhausts, realized can continuously the trace exhaust again in the pipeline water filling overall process in a large number, and need not to dispose the bypass control pipeline.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a schematic structural view of a full pressure high speed exhaust valve (with both the first and third exhaust ports open) according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a full pressure high speed exhaust valve (with both the first and third exhaust ports closed) according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a full pressure high speed exhaust valve (with the first exhaust port closed and the third exhaust port open) according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a guide sleeve in a full-pressure high-speed exhaust valve according to an embodiment of the invention.

In the figure:

1-a valve body; 2-valve cover; 3-pressing the cover; 4-a switching component; 5-a trigger component;

11-a scaffold; 12-an inlet; 13-a filter mantle; 14-plug;

21-a first chamber; 22-first exhaust port; 23-a third chamber;

31-a second chamber; 32-a guide sleeve; 33-a second exhaust port;

311-upper chamber; 312-a lower chamber;

321-a first channel; 3211-a first axial bore; 3212-a first radial hole; 322-a central bore; 323-second

A second channel; 3231-a second radial bore; 3232-second axial bore;

41-hollow bar; 411-a third vent; 412-a sealing ring; 42-a sealing plate; 421-annular rubber ring;

43-a membrane; 44-an upper platen; 45-pressing plate; 46-a lock nut; 47-a mounting seat;

51-a float; 511-a blocking part; 52-a trigger lever; 521-a conduction groove.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 4, the present embodiment provides a full-pressure high-speed exhaust valve including a valve body 1, a valve cap 2, a gland 3, a switching assembly 4, and a trigger assembly 5. Wherein, valve gap 2 is connected with valve body 1, and valve gap 2 forms first cavity 21 with valve body 1, is provided with the first exhaust port 22 with external intercommunication on the valve gap 2. The gland 3 is connected with the valve cover 2, the gland 3 and the valve cover 2 form a second chamber 31, a guide sleeve 32 is arranged in the gland 3, and a second exhaust port 33 communicated with the outside is arranged on the gland 3. The switching assembly 4 comprises a hollow rod 41, a sealing plate 42 and a diaphragm 43, the sealing plate 42 is disposed in the first chamber 21 and is used for sealing the first exhaust port 22, the diaphragm 43 is disposed in the second chamber 31 and divides the second chamber 31 into an upper chamber 311 and a lower chamber 312 communicated with the outside, the hollow rod 41 is slidably disposed on the valve cover 2, one end of the hollow rod 41 is connected with the sealing plate 42, the other end of the hollow rod 41 is connected with the diaphragm 43, and a third exhaust port 411 communicated with the upper chamber 311 is disposed at the end of the hollow rod 41 extending into the first chamber 21. The trigger assembly 5 comprises a floating body 51 and a trigger rod 52 which are connected, the floating body 51 is arranged in the first chamber 21, the trigger rod 52 movably penetrates through the hollow rod 41 and is in sliding connection with the guide sleeve 32, the floating body 51 can float up to block the third exhaust port 411 and drive the trigger rod 52 to slide in the guide sleeve 32 so as to conduct the upper chamber 311 and the second exhaust port 33.

As shown in fig. 1, in the stage of filling water into the pipeline, the sealing plate 42 is in a disengaged state from the first exhaust port 22, the floating body 51 sinks to disengage from the third exhaust port 411 due to its own gravity, the gas in the pipeline is squeezed into the first chamber 21 by the water, most of the gas is exhausted from the first exhaust port 22, and a small part of the gas enters the upper chamber 311 through the third exhaust port 411, because the guide sleeve 32 is in clearance fit with the trigger rod 52, only a small amount of gas overflows from the upper chamber 311, and as the gas in the upper chamber 311 becomes more, the diaphragm 43 drives the hollow rod 41 to slide downward under the action of the gas pressure of the gas in the upper chamber 311, so that the sealing plate 42 maintains the state of opening the first exhaust port 22, and ensures that a large amount of gas is exhausted through the first exhaust port 22 in the stage of filling water into the pipeline, thereby avoiding.

As shown in fig. 2, after the gas in the pipeline is exhausted, the water in the pipeline gradually enters the first chamber 21, the floating body 51 floats up to block the third exhaust port 411 under the buoyancy of the water and drives the trigger rod 52 to slide in the guide sleeve 32 to conduct the upper chamber 311 and the second exhaust port 33, the gas in the upper chamber 311 is exhausted through the second exhaust port 33, the air pressure applied to the diaphragm 43 is reduced, meanwhile, the sealing plate 42 moves up to block the first exhaust port 22 under the buoyancy of the water in the first chamber 21 and the air pressure of the gas, and the hollow rod 41 pushes the diaphragm 43 to exhaust the gas from the upper chamber 311 through the second exhaust port 33.

As shown in fig. 3, as the gas in the water gradually separates out, the gas gradually gathers at the top of the first chamber 21, the liquid level of the water in the first chamber 21 gradually decreases, when the liquid level of the water in the first chamber 21 decreases to the point that the buoyancy force applied to the floating body 51 is smaller than the self gravity, the floating body 51 sinks to be separated from the third exhaust port 411, a little air at the top of the first chamber 21 enters the upper chamber 311 through the third exhaust port 411 and is exhausted through the second exhaust port 33, after the gas is exhausted, the liquid level of the water in the first chamber 21 rises, the floating body 51 floats upwards again under the buoyancy force of the water to block the third exhaust port 411, and the process is repeated until the redundant gas in the pipeline is exhausted, so that the purposes of exhausting a large amount of exhaust gas and continuously exhausting a small amount of exhaust gas in the whole process of pipeline water filling are achieved.

In order to facilitate selective conduction between the upper chamber 311 and the second exhaust port 33, optionally, a first passage 321, a central hole 322, and a second passage 323 are provided on the guide sleeve 32, one end of the first passage 321 is communicated with the upper chamber 311, the other end of the first passage 321 is communicated with the central hole 322, one end of the second passage 323 is communicated with the central hole 322, the other end of the second passage 323 is communicated with the second exhaust port 33, the trigger rod 52 movably penetrates through the central hole 322, a conduction groove 521 is provided on the trigger rod 52, and when the trigger rod 52 slides in the central hole 322 to a preset position, the conduction groove 521 can conduct the first passage 321 and the second passage 323 to conduct the upper chamber 311 and the second exhaust port 33.

In this embodiment, for the convenience of processing, as shown in fig. 4, the first channel 321 includes a first axial hole 3211 and a first radial hole 3212 which are communicated with each other, the second channel 323 includes a second radial hole 3231 and a second axial hole 3232 which are communicated with each other, the first axial hole 3211 is communicated with the upper chamber 311, the first radial hole 3212 and the second radial hole 3231 are oppositely disposed on the sidewall of the central hole 322, and the second axial hole 3232 is communicated with the second exhaust port 33. The first axial hole 3211 and the second axial hole 3232 are formed in the axial direction of the guide sleeve 32, and the first radial hole 3212 and the second radial hole 3231 are formed in the radial direction of the guide sleeve 32. To facilitate buffering the air flow, optionally, the valve cover 2 is provided with a third chamber 23, the first exhaust port 22 communicates with the first chamber 21 and the third chamber 23, and the third chamber 23 communicates with the outside.

In the present embodiment, the hollow bar 41 is provided with an upper pressing plate 44 and a lower pressing plate 45, and the diaphragm 43 is interposed between the upper pressing plate 44 and the lower pressing plate 45. The upper pressure plate 44 and the lower pressure plate 45 are used for pressing the membrane 43, so that the membrane 43 is prevented from being damaged during up-and-down movement. In the embodiment, the area of the upper pressing plate 44 is larger than that of the sealing plate 42, and when the air pressure above the upper pressing plate 44 is the same as the air pressure below the sealing plate 42, because the area of the upper pressing plate 44 is larger than that of the sealing plate 42, the air pressure applied to the upper pressing plate 44 is larger than that applied to the sealing plate 42, and further the hollow rod 41 is driven to slide downwards, so that the sealing plate 42 maintains the state of opening the first exhaust port 22. The hollow bar 41 is provided with a locking nut 46 for locking the upper press plate 44. To ensure the sealing performance of the sealing plate 42, the side of the sealing plate 42 facing the first exhaust port 22 is optionally provided with an annular rubber ring 421.

In the present embodiment, the float 51 is provided with the stopper 511, and the seal 412 is provided between the stopper 511 and the third exhaust port 411. The floating body 51 is a long waist-shaped sphere, so that the floating body can float upwards under the buoyancy of water, and when the floating body 51 floats upwards, the sealing ring 412 at the third air outlet 411 is attached to the blocking part 511 to block the third air outlet 411. The hollow rod 41 is provided with a mounting seat 47, and the sealing ring 412 is mounted on the mounting seat 47. To facilitate the support of the float 51, optionally a support 11 is provided in the valve body 1, against which support 11 the float 51 can abut.

In this embodiment, the valve body 1 is provided with an inlet 12, the inlet 12 communicates with the first chamber 21, and a filter cover 13 is provided between the inlet 12 and the first chamber 21. Gas or water is introduced into the first chamber 21 through the inlet 12 of the valve body 1, and impurities are filtered out through the filter cover 13, so that the impurities are prevented from blocking or damaging the internal structure of the valve body 1. In order to facilitate detection or pressure relief, optionally, a water outlet and a plug 14 are arranged on the valve body 1, and the plug 14 is used for plugging the water outlet.

The working flow of the full-pressure high-speed exhaust valve provided by the embodiment is approximately as follows: as shown in fig. 1, in the stage of filling water into the pipeline, the sealing plate 42 is in a disengaged state from the first exhaust port 22, the floating body 51 sinks to disengage from the third exhaust port 411 due to its own gravity, the gas in the pipeline is squeezed into the first chamber 21 by the water, most of the gas is exhausted from the first exhaust port 22, and a small part of the gas enters the upper chamber 311 through the third exhaust port 411, because the guide sleeve 32 is in clearance fit with the trigger rod 52, only a small amount of gas overflows from the upper chamber 311, and as the gas in the upper chamber 311 becomes more, the diaphragm 43 drives the hollow rod 41 to slide downward under the action of the gas pressure of the gas in the upper chamber 311, so that the sealing plate 42 maintains the state of opening the first exhaust port 22, and ensures that a large amount of gas is exhausted through the first exhaust port 22 in the stage of filling water into the pipeline, thereby avoiding. As shown in fig. 2, after the gas in the pipeline is exhausted, the water in the pipeline gradually enters the first chamber 21, the floating body 51 floats up to block the third exhaust port 411 under the buoyancy of the water and drives the trigger rod 52 to slide in the guide sleeve 32 to conduct the upper chamber 311 and the second exhaust port 33, the gas in the upper chamber 311 is exhausted through the second exhaust port 33, the air pressure applied to the diaphragm 43 is reduced, meanwhile, the sealing plate 42 moves up to block the first exhaust port 22 under the buoyancy of the water in the first chamber 21 and the air pressure of the gas, and the hollow rod 41 pushes the diaphragm 43 to exhaust the gas from the upper chamber 311 through the second exhaust port 33. As shown in fig. 3, as the gas in the water gradually separates out, the gas gradually gathers at the top of the first chamber 21, the liquid level of the water in the first chamber 21 gradually decreases, when the liquid level of the water in the first chamber 21 decreases to the point that the buoyancy force applied to the floating body 51 is smaller than the self gravity, the floating body 51 sinks to be separated from the third exhaust port 411, a little air at the top of the first chamber 21 enters the upper chamber 311 through the third exhaust port 411 and is exhausted through the second exhaust port 33, after the gas is exhausted, the liquid level of the water in the first chamber 21 rises, the floating body 51 floats upwards again under the buoyancy force of the water to block the third exhaust port 411, and the process is repeated until the redundant gas in the pipeline is exhausted, so that the purposes of exhausting a large amount of exhaust gas and continuously exhausting a small amount of exhaust gas in the whole process of pipeline water filling are achieved.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.