Pneumatically controlled exhaust valve

Abstract

The present invention relates to the technical field of exhaust valves, and specifically to a pneumatically controlled exhaust valve. The pneumatically controlled exhaust valve comprises a housing, a connecting hole being formed in one end of the housing, and an exhaust channel being formed in a side wall of the end of the housing distant from the connecting hole. An exhaust pipe is mounted in the exhaust channel, and a sealing bolt is installed at an end of an exhaust pipe channel close to an outer side wall of the housing. An exhaust hole is provided on the sealing bolt, and an end of the exhaust pipe distant from the sealing bolt is connected to a swing rod by means of a first spring, a sealing gasket being mounted at an end of the swing rod close to the exhaust pipe. A floating block is disposed in the housing, and the swing rod and the floating block are non-reliably connected. The present invention mounts an alarm device on the exhaust valve such that, when the exhaust valve leaks or cannot exhaust, the alarm device gives a prompt to a user to remind the user to clean the exhaust valve, thereby solving the problem of the time taken for limescale to affect the exhaust valve being shorter than a prescribed time for regular cleaning, causing water supply difficulties or leakage in heating pipes.

Description

A gas-controlled exhaust valve Technical Field

[0001] The present invention relates to the technical field of exhaust valves, and in particular to an air-controlled exhaust valve. Background Art

[0002] Exhaust valves are commonly used in irrigation systems, building water supply systems, central heating systems, and heating boilers. Water typically contains approximately 2% dissolved air by volume, which is continuously released during water delivery. This air accumulates within the valve body. When the air pressure within the valve body exceeds the system pressure, the valve opens and vents the air, preventing it from accumulating in the pipe and impacting water flow. Once all the air is exhausted, the valve closes, preventing the discharge of liquid from the pipe. Existing exhaust valve cores are typically made of polymer materials, which resist deformation and rust in high-temperature water environments. Therefore, existing exhaust valves can function normally in both high- and low-temperature water environments.

[0003] However, in high-temperature water environments, such as centralized heating systems, water is first heated to 60°C in a boiler, and then piped to each household. Heat is exchanged between the pipes and radiators in the room. Because water contains calcium and magnesium, scale forms, and the higher the water temperature, the faster the scale forms. Therefore, the exhaust valves used in heating systems often become clogged with scale, preventing them from opening to vent air or from closing in time after venting, leading to leakage. This necessitates regular cleaning of the exhaust valves. However, because the water temperature varies from household to household, the actual rate of scale formation varies between exhaust valves. If the exhaust valves are only cleaned at the prescribed time, the scale's effect on the exhaust valve may be shorter than the prescribed cleaning time, causing difficulties in the heating pipes, poor heating performance in the room, or leaks in the exhaust valves.

[0004] To this end, a gas-controlled exhaust valve is proposed, which can provide timely reminders when the exhaust valve cannot be used. Summary of the Invention

[0005] The purpose of the present invention is to provide an air-controlled exhaust valve. By installing an alarm device on the exhaust valve, when the exhaust valve leaks or cannot exhaust, the alarm device will give a prompt to the user, reminding the user to clean the exhaust valve, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A gas-controlled exhaust valve, comprising:

[0008] The shell has a connecting hole for connecting to a pipe at one end, an exhaust passage is formed on the side wall of the shell away from the connecting hole, an exhaust pipe is installed in the exhaust passage, the middle part of the exhaust pipe is fixedly installed in the exhaust passage by a sealing ring, a closing bolt is installed at the end of the exhaust pipe close to the outer wall of the shell, an exhaust hole is formed on the side wall of the closing bolt, the end of the exhaust pipe away from the closing bolt is connected to a swing rod via a spring, a sealing gasket is installed at the end of the swing rod close to the exhaust pipe, a floating block is provided in the shell, a lifting ring is provided on the top of the floating block, and the end of the swing rod away from the exhaust pipe passes through the lifting ring to form an unreliable connection with the floating block;

[0009] Also includes:

[0010] An alarm device is installed on the side wall of the shell. The alarm device is used to promptly remind the user when the exhaust valve cannot exhaust or leaks due to scale.

[0011] When the exhaust valve is working normally, since the exhaust valve is generally installed at the highest point of the pipeline, the bubbles in the pipeline will enter the exhaust valve shell from the connecting hole and accumulate on the top of the inner wall of the shell. When the accumulated gas fails to squeeze the water in the shell toward the connecting hole, the floating block floats up under the action of the water and moves the swing rod toward the inner wall of the shell through the lifting ring. At this time, the sealing gasket completely seals the exhaust pipe and the gas in the shell cannot be discharged.

[0012] When the gas in the shell accumulates to a point where the air pressure is greater than the water pressure, the gas will squeeze the water toward the connection hole. As the water level drops, the floating block rotates around the end close to the exhaust pipe through the lifting ring, creating a gap between the sealing gasket and the exhaust pipe. The gas enters the exhaust pipe through the gap and is finally discharged to the outside through the exhaust hole of the closing bolt. As the gas is gradually discharged, the gas pressure in the shell gradually becomes less than the water pressure, so the water level in the shell gradually rises. When the sealing gasket contacts the exhaust pipe again, the exhaust valve stops exhausting and the water level stops rising.

[0013] However, under high temperature conditions, scale easily accumulates inside the shell. When the scale accumulates to a certain extent inside the shell, it may affect the movement of the floating block. When the floating block is stuck and cannot be discharged with the water level, the gas in the shell cannot be discharged, which eventually causes the gas to accumulate in the pipeline, affecting the water flow. When the floating block is stuck and cannot be discharged with the water level, the water level in the shell will continue to rise until the gas is completely discharged. Water will then enter the exhaust pipe and flow out of the exhaust hole, causing the exhaust valve to leak. Since the temperature of the water flow in the heating system is different when it reaches each household, the actual speed of scale formation varies between exhaust valves. If the exhaust valve is only cleaned regularly at the prescribed time, the time for scale to affect the exhaust valve may be shorter than the prescribed time for regular cleaning. Therefore, the present invention installs an alarm device on the exhaust valve. When the exhaust valve is leaking or cannot be exhausted, the alarm device will alert the user to clean the exhaust valve.

[0014] Preferably, the alarm device includes a first detection part, a second detection part, a warning part and a closing part. The first detection part for detecting whether the exhaust valve cannot exhaust is installed on the side wall of the shell, and the first detection part is located below the lower dead point of the water level when the exhaust valve is operating normally. The other end of the first detection part is connected to the warning part. When the first detection part is triggered, the warning part will give a striking color prompt to the user. The second detection part for detecting whether the exhaust valve is leaking is installed on the side wall of the shell, and the second detection part is located above the upper dead point of the water level when the exhaust valve is operating normally. A closing part is installed near the exhaust pipe of the shell, and the other end of the second detection part is fixedly connected to the closing part. When the second detection part is triggered, the closing part will block the exhaust hole of the closing bolt, and the second detection part will lock the closing part. The first detection part will also be triggered after the second detection part is triggered.

[0015] When the exhaust valve is operating normally, the water level in its shell will rise and fall repeatedly, and there will be an upper dead point and a lower dead point of the water level. The air pressure in the valve body will be greater than the water pressure. Since the first detection part is installed below the lower dead point of the water level, under normal circumstances, the first detection part will only be affected by water pressure, and the water pressure cannot trigger the first detection part. When the floating block is stuck and cannot drop with the water level, the gas in the shell cannot be discharged. After a long period of accumulation, the gas will completely squeeze the water in the shell to below the lower dead point of the water level. At this time, the first detection part will be affected by gas pressure. The first detection part will be triggered, and the warning part will send a striking color prompt to the user. The striking color is easy to be captured by the human sight. The water pressure personnel can close the stop valve of the pipeline according to the prompt, remove the exhaust valve for cleaning, and clean up the scale inside it; under normal circumstances, the second detection will only be affected by gas pressure. The gas pressure cannot trigger the second detection part. When the floating block is stuck and cannot rise with the water level, the water level in the shell will gradually rise as the gas is gradually discharged. However, since the exhaust pipe cannot be closed by the sealing gasket, the gas in the shell will be completely discharged to the outside of the shell through the exhaust pipe under the squeeze of the water flow. At this time, the water level does not exceed the second detection part, and the second detection part is triggered by the water pressure. The closing part will close the exhaust hole on the closing bolt, and the second detection part will stick the closing part in place to keep it sealing the exhaust hole. At this time, even if water flows into the exhaust pipe, it cannot flow out of the exhaust hole, but the gas cannot be discharged. Therefore, when the gas in the shell accumulates to squeeze the water level below the lower dead point of the water level, the first detection part is triggered.

[0016] Preferably, the first detection portion includes a through hole 1 formed on the side wall of the housing, an elastic diaphragm is fixedly mounted on one end of the through hole 1 close to the inner side wall of the housing to completely close the through hole 1, a push rod 1 is elastically slidably mounted in the through hole via a spring 2, and an end of the push rod 1 away from the elastic diaphragm is fixedly connected to the warning portion;

[0017] The second detection part includes a through hole 2 opened on the side wall of the shell, and an elastic diaphragm that completely closes the through hole 2 is fixedly installed at one end of the through hole 2 close to the inner wall of the shell. A top rod 2 is elastically slidably installed in the through hole through a spring 2, and the end of the top rod 2 away from the elastic diaphragm is fixedly connected to the closing part. The top of the floating block is connected to the vertical part of the L-shaped rod, and the vertical part of the L-shaped rod extends to the outside of the shell. The end of the horizontal part of the L-shaped rod is installed with a wedge-shaped block 1 that clamps the closing part.

[0018] In order to prevent the water in the shell from flowing out of through hole 1, an elastic diaphragm is used to completely seal the space between through hole 1 and the inner wall of the shell. The material of the elastic diaphragm can be selected from materials with strong toughness and deformation ability, such as rubber and composite materials. One end of the push rod 1 is connected to spring 2. When there is no pressure in the shell, spring 2 causes the elastic diaphragm to be concave and deformed into the shell through push rod 1. When the elastic diaphragm is subjected to water pressure, the elastic diaphragm will push push rod 1 to overcome spring 2 and move away from the floating block. However, the distance moved by push rod 1 at this time is not enough to trigger the warning unit. When the floating block is stuck and cannot be discharged with the water level, the gas in the shell cannot be discharged. After a long period of accumulation, the gas will completely squeeze the water in the shell below the elastic diaphragm. At this time, the pressure on the elastic diaphragm changes from water pressure to air pressure, and the pressure increases. Therefore, the elastic diaphragm will further push push rod 1 away from the floating block, and push rod 1 will trigger the warning unit.

[0019] The structure of the second detection part is basically the same as that of the first detection part, but the condition for the second detection part to trigger the sealing part is different from the condition for the first detection part to trigger the warning part. Under normal circumstances, since the through hole 2 is located above the upper dead point of the water level, the elastic diaphragm will be subjected to the pressure of the gas. The elastic diaphragm will deform under the action of the gas pressure, pushing the top rod 2 to overcome the spring 2 and move away from the floating block. At this time, the closing part will not close the exhaust hole. When the floating block is stuck and cannot rise with the water level, when the floating block is at the upper limit position, the wedge block 1 is not in contact with the closing part. Therefore, the L-shaped rod connected to the floating block will drive the wedge block 1 to move downward, so that the wedge block 1 and the closing part can contact each other. As the gas is gradually discharged, the water level in the shell will gradually rise, and the water level will not exceed the through hole 2. At this time, the pressure on the elastic diaphragm changes from air pressure to water pressure, and the pressure decreases. Therefore, the spring 2 will push the top rod 2 to move an end distance in the direction close to the floating block. The movement of the top rod 2 will trigger the closing part to completely close the exhaust hole, so that the gas and the beam cannot be discharged from the exhaust valve, thereby preventing the exhaust valve from leaking, and the wedge block 1 will jam the closing part, preventing it from moving away from the floating block.

[0020] Preferably, the through hole 1 and the through hole 2 are provided with limiting protrusions to prevent the elastic diaphragm from being over-extruded, and the end of the push rod close to the elastic diaphragm is configured to be an arc shape to reduce the contact stress between the push rod and the elastic diaphragm.

[0021] In order to prevent the elastic diaphragm from excessively deforming under the action of air pressure, causing rupture or destruction of the fixed connection between the elastic diaphragm and the inner wall of the shell, and also to prevent the pressure inside the shell from becoming the same as atmospheric pressure when the exhaust valve is removed for cleaning, so that spring 2 will quickly rebound the push rod toward the floating block, and the push rod will damage the elastic diaphragm due to excessive impact on the elastic diaphragm, limit protrusions are provided in through hole 1 and through hole 2 to limit the movement of the push rod to two extreme positions. In order to reduce stress concentration when the elastic diaphragm contacts the push rod and prevent the push rod from damaging the elastic diaphragm, the present invention sets the end of the push rod close to the elastic diaphragm in an arc shape. Since the elastic diaphragm also becomes an arc shape when deformed by pressure, the push rod with an arc surface can increase the contact area with the diaphragm and reduce the pressure per unit area.

[0022] Preferably, the closing portion includes a connecting rod vertically fixedly connected to the second push rod, a mounting ring is installed at the other end of the connecting rod, and the mounting ring is coaxial with the closing bolt, a wedge block 2 that cooperates with the first wedge block is installed at the highest point of the outer wall of the mounting ring, a sealing ring 2 is fixedly installed on the mounting ring, and the inner diameter of the sealing ring 2 is smaller than the diameter of the closing bolt, and a chamfer is provided on the inner ring of the sealing ring 2 away from the corner of the connecting rod to facilitate the sealing ring 2 to be put on the closing bolt.

[0023] The connecting rod moves with push rod 2. When the exhaust valve is operating normally or removed, the connecting rod in either extreme position will not allow seal ring 2 to completely seal the exhaust hole. When the second detection portion is subjected to water pressure, push rod 2 is in the middle of its motion range, and seal ring 2 completely blocks the exhaust hole, preventing gas and water from escaping through the hole and preventing leakage. Simultaneously, wedge block 2 and wedge block 1 elastically deform and eventually become stuck, preventing seal ring 2 from moving closer to the closing bolt. To enhance the sealing effect of seal ring 2, the inner diameter of seal ring 2 is smaller than the outer diameter of the closing bolt, increasing sealing performance through compression deformation. However, because the exhaust hole is located at the edge of the closing bolt, this causes spring 2 to pull seal ring 2 away from the closing bolt when the exhaust valve is removed for cleaning. To ensure that seal ring 2 fits more easily onto the closing bolt when the exhaust valve is reused, the inner corner of seal ring 2, away from the connecting rod, is chamfered to prevent damage.

[0024] Preferably, the warning part includes a protective shell fixedly mounted on the outer wall of the shell and coaxial with the through hole, the end of the protective shell away from the shell is made of transparent material, the end of the push rod away from the diaphragm is connected to a prompt rod, the side wall of the prompt rod is covered with eye-catching pigment, when the push rod is pushed by air pressure to contact the limiting protrusion, the prompt rod appears in the transparent area of ​​the protective shell, and a shielding part is installed at the boundary of the transparent area and the non-transparent area on the inner wall of the protective shell, the shielding part is used to fill the gap between the prompt rod and the protective shell to prevent the user from observing the side wall of the prompt rod at a special angle and forming an erroneous judgment, and the shielding part includes materials with poor light transmittance and low surface friction coefficient such as sponge, cardboard, and plastic ring.

[0025] When the first detection unit is subjected to gas pressure, the push rod moves the indicator rod to the transparent area of ​​the protective shell to alert the user that the exhaust valve is clogged and needs to be cleaned promptly. The sidewall of the indicator rod is coated with a conspicuous pigment, such as red or yellow, to facilitate user observation. The color of the indicator rod should be significantly different from the overall color of the exhaust valve to attract the user's attention. However, due to installation limitations, there is a certain distance between the protective shell and the push rod. When the user observes the protective shell from the axis of the push rod, the color of the indicator rod's sidewall may be visible through the distance between the push rod and the protective shell, causing a misjudgment. Although the misjudgment can be resolved by approaching the exhaust valve, this is bound to cause some inconvenience to the user. Therefore, a shielding member can be installed at the boundary between the transparent and opaque areas of the protective shell. The shielding member can be made of materials with low light transmittance and low surface friction, such as sponge, cardboard, or plastic rings. This material will not hinder the movement of the indicator rod and will also prevent misjudgment by the user. The color of the indicator shielding member should be different from the color of the indicator rod's sidewall.

[0026] If conditions permit, a warning light or buzzer can be installed next to the exhaust valve, and a contact switch can be installed in the protective shell. When the contact switch is triggered by the push rod, the warning light and buzzer electrically connected to the contact switch can flash and sound to remind the user. Although such a reminder effect is stronger, there is a certain risk in using electrical equipment due to the installation of the exhaust valve and the water flow pipeline.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. By installing the first detection unit below the lower dead center of the exhaust valve, when the floating block is stuck by scale and cannot create a gap between the swing arm and the exhaust pipe, gas in the shell cannot be discharged and gradually accumulates. When the gas squeezes the water level below the lower dead center, the pressure on the elastic diaphragm increases, and the elastic diaphragm pushes the push rod away from the elastic diaphragm. The push rod then drives the indicator rod into the transparent area of ​​the protective shell. The eye-catching color on the side wall of the indicator rod will alert the user to the exhaust valve abnormality. This timely reminder to the user shortens the time it takes for water to flow into the pipeline after the exhaust valve fails to vent, reducing the possibility of pipeline damage.

[0029] 2. By installing a second detection unit above the exhaust valve's upper water dead center, when the floating block becomes stuck by scale and cannot drive the rocker arm to block the exhaust pipe, the gas in the housing will gradually be discharged from the exhaust hole under the action of water pressure, and the water level will gradually rise. When the water level submerges the upper water dead center, the pressure on the elastic diaphragm changes from air pressure to water pressure. The pressure decreases, and under the action of spring 2, push rod 2 drives seal ring 2 through the connecting rod to seal the exhaust hole, preventing the exhaust valve from leaking indoors. Wedge block 1 also blocks wedge block 2, ensuring that seal ring 2 will continue to seal the exhaust hole. Subsequently, because the exhaust hole cannot be exhausted, when the gas pushes the water level below the lower water dead center, the first detection unit will trigger the warning unit to alert the user.

[0030] 3. In order to reduce the stress concentration when the elastic diaphragm contacts the push rod and prevent the push rod from damaging the elastic diaphragm, the present invention sets the end of the push rod close to the elastic diaphragm to be arc-shaped. Since the elastic diaphragm is also arc-shaped when deformed by pressure, the push rod with an arc surface can increase the contact area with the diaphragm and reduce the pressure per unit area. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic diagram of the overall structure of the present invention;

[0032] FIG2 is a front view of the present invention;

[0033] FIG3 is a cross-sectional view of FIG1 AA;

[0034] Figure 4 is a sectional view BB in Figure 2;

[0035] FIG5 is a partial enlarged view of point D in FIG3;

[0036] FIG6 is a partial enlarged view of point E in FIG4 ;

[0037] FIG7 is a partial enlarged view of F in FIG1;

[0038] FIG8 is a schematic diagram of the state when the warning part of the present invention is not triggered;

[0039] FIG9 is a schematic diagram of the state of the warning part of the present invention when it is triggered.

[0040] In the figure: 1. Shell; 2. Connecting hole; 3. Exhaust duct; 4. Exhaust pipe; 501. Sealing ring 1; 502. Sealing ring 2; 6. Closing bolt; 601. Exhaust hole; 7. Rocker arm; 8. Floating block; 901. Through hole 1; 902. Through hole 2; 10. Elastic diaphragm; 1101. Spring 1; 1102. Spring 2; 1201. Push rod 1; 1202. Push rod 2; 13. Connecting rod; 14. Mounting ring; 15. Protective shell; 16. Prompt rod; 17. Shielding part; 18. L-shaped rod; 1901. Wedge block 1; 1902. Wedge block 2. Implementation Method

[0041] The following will be combined with Figures 1 to 9 of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments of the present invention include but are not limited to the embodiments described below. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0042] The terms "first" and "second" appearing in this application are used solely for the purpose of describing the order of objects, and are not intended to indicate relative importance or to specify the quantity of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of the aforementioned features. The term "plurality" used in this application means at least two.

[0043] In the first embodiment, when the floating block 8 is stuck by scale and cannot drop with the water level, resulting in no gap being generated between the swing rod 7 and the exhaust pipe 4 .

[0044] At this time, since the gas in the shell 1 cannot enter the exhaust pipe 4 and then be discharged from the exhaust hole 601, the gas entering the shell 1 from the connecting hole 2 will accumulate more and more. Under the action of gas pressure, the water level in the shell 1 gradually drops. When the water level drops below the through hole 1 901, the pressure on the elastic diaphragm 10 changes from water pressure to air pressure. The pressure increases, and the elastic diaphragm 10 pushes the top rod 1201 to overcome the spring 2 1102 and move away from the floating block 8. The top rod 1201 drives the prompt rod 16 to move away from the floating block 8. The prompt rod 16 moves to the transparent area of ​​the protective shell 15 to remind the user. After receiving the reminder, the user closes the stop valve of the pipeline and removes the exhaust valve. At this time, since there is no pressure in the shell 1, the prompt rod 16 moves back to the non-transparent area of ​​the protective shell 15 under the action of the spring 2 1102. The user cleans the scale attached to the inside and then reinstalls the exhaust valve back to the pipeline.

[0045] In the second embodiment, when the floating block 8 is stuck by scale and cannot rise with the water level, the sealing gasket on the swing rod 7 cannot seal the exhaust pipe 4.

[0046] At this time, since the floating block 8 is not located at the highest position in the movable range, the L-shaped rod 18 moves downward for a distance following the floating block 8 , and the wedge block 1901 can contact the wedge block 2 1902 . Since the exhaust pipe 4 is always in an open state, the gas will enter the exhaust pipe 4 and then be discharged from the exhaust hole 601. Under the action of water pressure, the gas is gradually discharged and the water level gradually rises. When the water level does not exceed the through hole 2 902, the pressure on the elastic diaphragm 10 at the through hole 2 902 changes from air pressure to water pressure, and the pressure decreases. Under the action of the spring 2 1102, the top rod 2 1202 moves toward the direction close to the floating block 8, and the top rod 2 1202 drives the connecting rod 13 to move synchronously, and the connecting rod 13 drives the mounting ring 14 to move, and the mounting ring 14 drives the sealing ring 2 502 to completely close the exhaust hole 601. At this time, the gas in the shell 1 cannot be discharged from the exhaust hole 601, and the water level stops rising. At the same time, elastic deformation occurs between the wedge block 2 1902 and the wedge block 1 1901 and eventually gets stuck. At this time, the sealing ring 2 502 cannot move toward the direction close to the closing bolt 6. Over a period of time, as gas continues to accumulate, the water level gradually drops under the action of gas. When the water level drops below through hole 2 902, the pressure on the elastic diaphragm 10 returns to gas pressure. However, wedge block 1901 is now stuck in wedge block 2 1902, and the elastic diaphragm 10 cannot push push rod 2 1202 to move. When the water level drops below through hole 1 901, the pressure on the elastic diaphragm 10 changes from water pressure to air pressure. As the pressure increases, the elastic diaphragm 10 at through hole 1 901 pushes push rod 1 1201, overcoming spring 2 1102 and moving away from the floating block 8. Push rod 1 1201 drives the prompt rod 16 away from the floating block 8. The prompt rod 16 moves to the transparent area of ​​the protective shell 15, alerting the user. After receiving the alert, the user closes the stop valve of the pipeline, removes the exhaust valve, cleans the scale attached to the inside, and then reinstalls the exhaust valve on the pipeline.

[0047] Although a number of embodiments of the present invention have been enumerated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the states and components of these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. .A gas-controlled exhaust valve, comprising: A shell (1), wherein one end of the shell (1) is provided with a connection hole (2) connected to a pipe, an exhaust passage is provided on a side wall of the shell (1) at an end away from the connection hole (2), an exhaust pipe (4) is installed in the exhaust passage, the middle part of the exhaust pipe (4) is fixedly installed in the exhaust passage via a sealing ring (501), an end of the exhaust pipe (3) close to the outer wall of the shell (1) is provided with a closing bolt (6), an exhaust hole (601) is provided on the side wall of the closing bolt (6), an end of the exhaust pipe (4) away from the closing bolt (6) is connected to a swing rod (7) via a spring (1101), an end of the swing rod (7) close to the exhaust pipe (4) is provided with a sealing gasket, a floating block (8) is provided in the shell (1), a lifting ring is provided on the top of the floating block (8), and an end of the swing rod (7) away from the exhaust pipe (4) passes through the lifting ring to form an unreliable connection with the floating block (8); It is characterized by further comprising: An alarm device is installed on the side wall of the housing (1), and the alarm device is used to promptly alert the user when the exhaust valve is unable to exhaust or leaks due to scale.

2. The gas-controlled exhaust valve according to claim 1, characterized in that: The alarm device comprises a first detection part, a second detection part, a warning part and a closing part. The first detection part for detecting whether the exhaust valve is unable to exhaust is mounted on the side wall of the housing (1), and the first detection part is located below the lower dead point of the water level when the exhaust valve is operating normally. The other end of the first detection part is connected to the warning part. When the first detection part is triggered, the warning part will give a user a striking color prompt. The second detection part for detecting whether the exhaust valve is leaking is mounted on the side wall of the housing (1), and the second detection part is located above the upper dead point of the water level when the exhaust valve is operating normally. The closing part is mounted near the exhaust pipe (3) of the housing (1), and the other end of the second detection part is fixedly connected to the closing part. When the second detection part is triggered, the closing part will block the exhaust hole (601) of the closing bolt (6), and the second detection part will lock the closing part. The first detection part will also be triggered after the second detection part is triggered.

3. The gas-controlled exhaust valve according to claim 2, characterized in that: The first detection portion comprises a through hole 1 (901) formed on the side wall of the housing (1), an elastic diaphragm (10) which completely closes the through hole 1 (901) being fixedly mounted at one end of the through hole 1 (901) close to the inner wall of the housing (1), a push rod 1 (1201) being elastically slidably mounted in the through hole via a spring 2 (1102), and an end of the push rod 1 (1201) which is away from the elastic diaphragm (10) is fixedly connected to the warning portion; 4. The gas-controlled exhaust valve according to claim 2, characterized in that: The second detection part comprises a second through hole (902) formed on the side wall of the shell (1); an elastic diaphragm (10) which completely closes the second through hole (902) is fixedly installed at one end of the second through hole (902) close to the inner wall of the shell (1); a second top rod (1202) is elastically slidably installed in the through hole via a second spring (1102); an end of the second top rod (1202) which is away from the elastic diaphragm (10) is fixedly connected to the closing part; a vertical portion of an L-shaped rod (18) is connected to the top of the floating block (8); the vertical portion of the L-shaped rod extends to the outside of the shell (1); and a wedge-shaped block (1901) which clamps the closing part is installed at the end of the horizontal portion of the L-shaped rod (18).

5. The gas-controlled exhaust valve according to claim 3, characterized in that: The through hole 1 (901) and the through hole 2 (902) are provided with limiting protrusions for preventing the elastic diaphragm (10) from being over-extruded.' 6. The gas-controlled exhaust valve according to claim 3, characterized in that: One end of the push rod close to the elastic diaphragm (10) is configured to be in an arc shape for reducing the contact stress between the push rod and the elastic diaphragm (10).

7. The gas-controlled exhaust valve according to claim 2, characterized in that: The closing portion comprises a connecting rod (13) vertically fixedly connected to the second top rod (1202); a mounting ring (14) is installed at the other end of the connecting rod (13); the mounting ring (14) is coaxial with the closing bolt (6); a wedge block (1902) matching with the wedge block (1901) is installed at the highest point of the outer wall of the mounting ring (14); a sealing ring (502) is fixedly installed on the mounting ring (14); and the inner diameter of the sealing ring (502) is smaller than the diameter of the closing bolt (6).

8. The gas-controlled exhaust valve according to claim 7, characterized in that: The inner ring of the second sealing ring (502) is provided with a chamfer at a corner away from the connecting rod (13) to facilitate the second sealing ring (502) to be sleeved on the closing bolt (6).

9. The gas-controlled exhaust valve according to claim 2, characterized in that: The warning portion comprises a protective shell (15) fixedly mounted on the outer wall of the shell (1) and coaxial with the through hole 1 (901); the end of the protective shell (15) away from the shell (1) is made of a transparent material; the end of the push rod 1 (1201) away from the diaphragm is connected to a prompt rod (16); the side wall of the prompt rod (16) is covered with eye-catching paint; when the push rod 1 (1201) is pushed by air pressure to contact the limit protrusion, the prompt rod (16) appears in the transparent area of ​​the protective shell (15).

10. The gas-controlled exhaust valve according to claim 9, characterized in that: A shielding portion (17) is installed at the boundary between the transparent area and the non-transparent area on the inner side wall of the protective shell (15), and the shielding portion (17) is used to fill the gap between the prompt rod (16) and the protective shell (15) to prevent the user from observing the side wall of the prompt rod (16) at a special angle, thereby causing misjudgment.

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