Sewage air valve capable of preventing water hammer

Abstract

The utility model discloses a water hammer prevention sewage air valve which is mainly applied to a sewage pipeline system, a floating ball capable of floating up and down is connected with a main valve clack through a long connecting rod and drives the main valve clack to open or close a second opening, and sewage can be effectively prevented from polluting the second opening and affecting use of the air valve. Meanwhile, the air valve in the scheme is further provided with an adjusting body, a throttling hole is formed in the adjusting body, an adjusting valve clack is arranged in the adjusting body, one side of the adjusting valve clack is connected with an elastic piece, and when the adjusting valve clack moves upwards, the gas acting force borne by the adjusting valve clack is opposite to the elastic force of the elastic piece on the adjusting valve clack in direction. The larger the elastic force of the elastic piece acting on the adjusting valve clack is, the water filling hammer caused by the fact that the adjusting valve clack moves upwards to blow and block the air valve can be avoided. And the adjusting valve clack moves upwards, so that the exhaust area of the throttling hole is approximately continuously and linearly reduced, the pressure in the valve is gradually changed, the water filling speed is gradually reduced, and the peak value of a bridged water hammer is slowed down.

Description

Technical Field

[0001] This utility model relates to the field of air valve technology, and more specifically, to a sewage air valve for preventing water hammer. Background Technology

[0002] Wastewater transport systems are an essential part of urban infrastructure, and wastewater air valves are indispensable in wastewater transport pipelines. Installed on wastewater pipelines, wastewater air valves are crucial devices that release large amounts of air during filling, release small amounts of air during transport, and draw in large amounts of air under negative pressure.

[0003] Because sewage contains oil and other contaminants that easily float to the surface and adhere to valves and pipes, and because air valves are installed high up in the pipeline, the sewage air valve body is relatively long to prevent sewage from escaping through the upper opening. Oil and contaminants adhering to the valve port can cause the sewage air valve to malfunction. Therefore, the sewage air valve is designed to only allow air intake and exhaust, not drainage, to prevent sewage from entering the upper opening. Furthermore, during sewage transport, gas is released from the sewage. If this gas is not promptly removed, it accumulates in the valve cavity, causing increased internal pressure and affecting the operation of the air valve.

[0004] In addition, existing sewage air valves are prone to clogging when filled with water too quickly, causing water hammer. Moreover, water hammer also occurs frequently in water pipelines. Both water hammer and water hammer can cause significant damage to pipeline facilities. Utility Model Content

[0005] This utility model provides a sewage air valve for preventing water hammer. In this solution, while realizing the intake and exhaust of the sewage air valve, it can also adaptively adjust the exhaust volume to achieve pressurized and orderly exhaust, preventing water hammer when the valve is closed; at the same time, when the pipeline generates water hammer, it reduces the peak value of the water hammer.

[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0007] A sewage air valve for preventing water hammer includes a valve body, a valve cavity is formed in the valve body, and a first opening and a second opening communicating with the valve cavity are respectively provided on the lower side and the upper side of the valve body;

[0008] The valve chamber is equipped with a float that can float up and down and a main valve disc connected to the float via a long connecting rod. When the float floats up and down, it drives the main valve disc to open or close the second opening.

[0009] It also includes an adjusting body located outside the second opening, the adjusting body having an exhaust chamber communicating with the valve chamber through the second opening; a throttling fluid is connected to the upper side of the adjusting body, and a plurality of throttling holes are formed on the throttling fluid that can communicate with the exhaust chamber and the outside; an adjusting valve disc is provided in the adjusting body, and an elastic element is connected to one side of the adjusting valve disc;

[0010] When the air valve exhausts air, the gas in the exhaust chamber acts on the regulating valve disc, causing the regulating valve disc to move relative to the regulating body to adjust the exhaust area of ​​the throttling orifice; and during this movement, the force exerted on the regulating valve disc by the gas in the exhaust chamber is opposite in direction to the elastic force exerted on it by the elastic member.

[0011] As a further improvement, there are multiple throttling orifices, each of which is an elongated or circular orifice, circumferentially distributed on the throttling fluid.

[0012] As a further improvement, the regulating valve disc and the elastic element are both sleeved and connected to the guide shaft, and the guide shaft is fixedly set relative to the regulating body.

[0013] As a further improvement, a gap is provided between the regulating valve disc and the inner wall of the throttling fluid, and the flow area of ​​the gap accounts for 3% to 10% of the upper opening area of ​​the throttling fluid.

[0014] As a further improvement, it also includes a connecting frame fixedly disposed relative to the main valve disc, an exhaust port communicating with the valve chamber and the exhaust chamber on the main valve disc, one end of the long connecting rod near the main valve disc being movably connected to the connecting frame and a micro exhaust valve disc being disposed at that end; the float ball can drive the micro exhaust valve disc to move relative to the connecting frame to open or close the exhaust port accordingly.

[0015] As a further improvement, a valve disc connecting seat is provided at the center of the main valve disc. One end of the valve disc connecting seat extends to the upper side of the main valve disc and is connected to the guide rod, while the other end passes through the connecting frame and extends to the inner side of the connecting frame and is connected to the micro-discharge valve seat.

[0016] As a further improvement, the micro-discharge valve is slidably disposed relative to the connecting frame, with one end of the micro-discharge valve located inside the connecting frame and the other end passing through the connecting frame and connected to the long connecting rod; an annular baffle is also provided protruding from the end of the micro-discharge valve located inside the connecting frame, and the annular baffle can abut against the inner side of the connecting frame.

[0017] As a further improvement, the exhaust port is opened on the valve disc connecting seat, a guide rod through hole communicating with one end of the exhaust port is opened in the guide rod, and a through hole communicating with the other end of the exhaust port is opened in the micro exhaust valve seat.

[0018] As a further improvement, a connecting guide seat is slidably sleeved on the guide rod, the guide seat being located at the axial center of the second opening and fixedly disposed relative to the valve body.

[0019] As a further improvement, the upper side of the valve body is sealed to the valve cover, and the second opening is formed on the valve cover; the inner side of the second opening is connected to the valve seat, and a main sealing ring is embedded between the valve seat and the inner wall of the second opening, and the main sealing ring can cooperate with the main valve disc to form a sealing connection.

[0020] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0021] (1) The water hammer-proof sewage air valve of this utility model is mainly used in sewage pipeline systems. The float ball that can float up and down is connected to the main valve disc through a long connecting rod, which drives the main valve disc to open or close the second opening. This can effectively prevent sewage from contaminating the second opening and affecting the use of the air valve. At the same time, the air valve in this solution is also equipped with an adjusting body. The adjusting body is equipped with a throttling orifice, and the adjusting valve disc is equipped with an adjusting valve disc. One side of the adjusting valve disc is connected to an elastic element. When the adjusting valve disc moves upward, the gas force it receives is opposite to the elastic force of the elastic element. When the gas acts on the adjusting valve disc and makes it move upward, the adjusting valve disc gradually changes the ventilation area of ​​the throttling orifice, slowing down the water filling and venting speed. Moreover, the greater the gas force acting on the adjusting valve disc, the greater the elastic force of the elastic element acting on the adjusting valve disc, preventing the main valve disc from prematurely blocking the second opening and causing water hammer. In addition, the upward movement of the adjusting valve disc makes the venting area of ​​the throttling orifice decrease continuously and linearly. The pressure inside the valve gradually changes, making the water filling speed gradually slow down and reducing the peak value of the water hammer.

[0022] (2) The water hammer sewage air valve of this utility model has a gap between the regulating valve disc and the inner wall of the throttling fluid. When the regulating valve disc is blown to the top of the regulating body, the air valve still has a certain exhaust volume, so as to avoid the main valve disc from blocking the second opening in advance and causing valve-closing water hammer.

[0023] (3) The water hammer-proof sewage air valve of this utility model has a main valve disc connected to a connecting frame, an exhaust hole in the center of the main valve disc, and a micro-exhaust valve disc at one end of a long connecting rod that is movably connected to the connecting frame. The float can also drive the micro-exhaust valve disc to move relative to the connecting frame to open or close the exhaust hole accordingly. During the pipeline sewage transportation process, gas is released from the sewage in the valve cavity and accumulates in the valve cavity. As the accumulated gas increases, the water level in the valve cavity drops, the float drops, and at the same time, the float drives the long connecting rod to move down. The long connecting rod moves relative to the connecting frame and, guided by the connecting frame, the micro-exhaust valve disc disengages from the exhaust hole, causing the exhaust hole to open and the released gas to be discharged through the exhaust hole.

[0024] Other technical problems that the waterproof hammer sewage air valve of this utility model can solve, other technical features contained in the technical solution, and the advantages brought by these technical features will be further explained in detail with reference to the accompanying drawings. Attached Figure Description

[0025] Figure 1 This is a schematic cross-sectional view of the overall structure of the water hammer-resistant sewage air valve;

[0026] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 for Figure 1 Enlarged diagram of point B in the middle.

[0028] Description of labels:

[0029] 1. Valve body; 10. Valve chamber; 11. First opening; 12. Float; 121. Connecting sleeve; 13. Long connecting rod; 14. Main valve disc; 141. Valve disc connecting seat; 142. Exhaust port; 15. Guide rod; 151. Guide rod through hole; 16. Connecting frame; 17. Micro-exhaust valve seat; 18. Micro-exhaust valve disc; 19. Plug; 2. Valve cover; 21. Second opening; 22. Valve seat; 23. Main sealing ring; 24. Guide bracket; 25. Guide seat; 3. Filter screen; 4. Protective cover; 5. Long screw; 6. Adjusting body; 60. Exhaust chamber; 61. Throttling element; 611. Throttling orifice; 62. Adjusting valve disc; 63. Guide shaft; 64. Elastic element. Detailed Implementation

[0030] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0031] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0032] Furthermore, the terms such as "upper," "lower," "left," "right," "inner," "outer," "middle," and "center" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this utility model. In addition to indicating orientation or positional relationships, some of the aforementioned terms may also have other meanings. For example, the term "upper" may, in certain circumstances, indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0033] The water hammer-proof sewage air valve in this embodiment is installed in the sewage pipeline system. It is mainly used to release a large amount of air when the pipeline is flushed, to draw in a large amount of air when the pipeline is emptied or burst, and to prevent water hammer when the valve is closed and to reduce the peak value of water hammer.

[0034] like Figure 1 As shown, the water hammer-resistant sewage air valve in this embodiment includes a valve body 1, with a valve cavity 10 inside the valve body 1. A second opening 21 and a first opening 11, communicating with the valve cavity 10, are respectively provided on the upper and lower sides of the valve body 1. Specifically, a valve cover 2 is sealed to the upper side of the valve body 1, and the second opening 21 is located on the valve cover 2. An O-ring is also provided between the valve cover 2 and the valve body 1 to seal the connection between them.

[0035] The valve chamber 10 is equipped with a float 12 that can float up and down, and a long connecting rod 13 located at the axial center of the valve chamber 10. One end of the long connecting rod 13 is connected to the float 12, and the other end is connected to the main valve disc 14. Sewage in the pipeline enters the valve chamber through the first opening 11, and the float 12 floats up and down under the action of buoyancy. During the floating process, the float 12 drives the main valve disc 14 to move along the axial direction of the valve chamber through the long connecting rod 13. The main valve disc 14 is arc-shaped and is part of a spherical body. The arc surface on the upper side of the main valve disc 14 can cooperate with the second opening 21 to close and open the second opening 21.

[0036] Regarding the long connecting rod 13, it should be noted that during the air valve filling process, the air valve releases a large amount of air through the second opening 21. After filling, the sewage enters the valve cavity, causing the float 12 to move upwards. The float 12 then moves the main valve disc 14 closer to the second opening 21. During this process, sewage continues to enter, and the float 12 further drives the main valve disc 14 to cooperate with the second opening 21, promptly closing the second opening. The length of the long connecting rod 13 needs to be sufficient to prevent sewage from overflowing to the main valve disc 14 and the second opening 21. The sewage only controls the float 12's movement, and the long connecting rod 13 controls whether the main valve disc 14 cooperates with the second opening 21. This prevents oil and other substances in the sewage from contaminating the main valve disc 14 and the second opening 21, thus avoiding air valve malfunction.

[0037] In sewage pipeline systems, if the water filling speed is too fast, the second opening 21 is easily blocked, causing water hammer. (Combined with...) Figure 2 As shown, to avoid water hammer, the air valve in this embodiment also includes an adjusting body 6 located outside the second opening 21. The adjusting body 6 has an exhaust chamber 60 that communicates with the valve chamber 10 through the second opening 21. A throttling fluid 61 is connected to the upper side of the adjusting body 6. The throttling fluid 61 has several throttling holes 611 that can communicate with the exhaust chamber 60 and the outside. An adjusting valve disc 62 is provided inside the adjusting body 6. An elastic member 64 is connected to one side of the adjusting valve disc 62. When the air valve exhausts, the gas in the exhaust chamber 60 acts on the adjusting valve disc 62, causing the adjusting valve disc 62 to move relative to the adjusting body 6 to adjust the exhaust area of ​​the throttling holes 611. Moreover, during this movement, the gas force acting on the adjusting valve disc 62 is opposite in direction to the elastic force exerted on it by the elastic member 64.

[0038] according to Figure 2 As shown in the view, the throttling fluid 61 is located within the exhaust chamber 60, and the elastic element 64 is located above the regulating valve disc 62. During exhaust, the gas in the exhaust chamber 60 acts on the regulating valve disc 62, causing it to move upward. This reduces the exhaust area of ​​the throttling orifice 611 on the upper side of the regulating valve disc 62, while simultaneously compressing the elastic element 64. The greater the gas force acting on the regulating valve disc 62, the more it tends to move upward, resulting in a smaller exhaust area, greater compression of the elastic element 64, and a greater elastic force exerted by the elastic element 64 on the regulating valve disc 62. Furthermore, during this process, the gas force acting on the regulating valve disc 62 and the exhaust area of ​​the throttling orifice 611 on the upper side of the regulating valve disc 62 exhibit an almost linear relationship, achieving pressurized and orderly exhaust during air valve exhaust and preventing water hammer during valve closure.

[0039] In this embodiment, during the filling process of the sewage pipeline, before the sewage enters the valve body 1, the float 12 droops, and the second opening 21 opens. Gas in the pipeline enters the valve chamber 10 through the first opening 11, then exits through the second opening 21 into the exhaust chamber 60, and finally exits to the outside through the throttling orifice 611. If the filling speed increases during the filling process, the exhaust speed and volume of the second opening 21 increase, and a large amount of gas enters the exhaust chamber 60, exerting a force on the regulating valve disc 62. See... Figure 2The gas force applied below the regulating valve disc 62 increases the gas flow rate and the force, causing the regulating valve disc 62 to move upwards. This reduces the venting area of ​​the throttling orifice 611 and thus the venting volume. During this reduction in venting volume, a reaction force acts on the valve chamber 10 and the venting chamber 60, increasing the gas pressure within them and tending to slow the water filling rate. In this process, the upward movement of the regulating valve disc 62 causes the venting area of ​​the throttling orifice 611 to decrease almost continuously and linearly. The pressure in the valve chamber 10 and the venting chamber 60 gradually changes, slowing the water filling rate and mitigating the peak value of water hammer. The greater the force exerted by the gas in the venting chamber 60 on the regulating valve disc 62, the greater the elastic force exerted by the elastic element 64 on the regulating valve disc 62, effectively preventing the air valve from being blocked and causing water hammer during filling.

[0040] After the water continues to be filled, the sewage enters the valve chamber 10. As the sewage enters, the float 12 floats up under the action of buoyancy, and drives the main valve disc 14 to move to cooperate with the second opening 21 through the long connecting rod 13, and closes the second opening 21.

[0041] During the water outage, the water level in the valve chamber 10 drops, the float ball 12 descends and drives the main valve disc 14 to move down, the second opening 21 opens, and then air is drawn in through the throttling orifice 611, which can eliminate the negative pressure in the pipeline and prevent the pipeline from being crushed.

[0042] An elastic element 64 is provided on one side of the regulating valve disc 62. The elastic force of the elastic element 64 can adaptively change with the magnitude of the gas force. When the force increases, the elastic force of the elastic element 64 also increases, preventing the air valve from being blocked. In this embodiment, the elastic element 64 can be a spring.

[0043] In a preferred embodiment, there are multiple throttling orifices 611, each of which is an elongated orifice. These elongated orifices are vertically arranged and evenly and circumferentially distributed on the throttling fluid 61. For example... Figure 2 In the initial state, the regulating valve disc 62 is located at the lowest end of the throttling fluid 61, and the venting area of ​​the throttling orifice 611 is at its maximum. When the water filling speed is too fast, the gas force on the regulating valve disc 62 increases, causing the regulating valve disc 62 to be blown up. This upward movement of the regulating valve disc 62 reduces the venting area of ​​the throttling orifice 611, thus reducing the venting volume of the throttling orifice 611.

[0044] In other embodiments, each throttling orifice 611 may also be a circular orifice, which is also uniformly and circumferentially distributed on the throttling fluid 61. In other cases, the throttling orifice 611 may also be other shapes.

[0045] In one embodiment, both the regulating valve disc 62 and the elastic element 64 are sleeved and connected to the guide shaft 63, which is fixedly disposed relative to the adjusting body 6. During the up-and-down movement of the regulating valve disc 62 and the compression or release of the elastic element 64, the guide shaft 63 guides the regulating valve disc 62 and the elastic element 64. A limiting plate is also provided at the lower end of the guide shaft 63 to limit the regulating valve disc 62 and prevent it from detaching from the guide shaft 63.

[0046] A gap is provided between the regulating valve disc 62 and the inner wall of the throttling fluid 61, and the flow area of ​​this gap accounts for 5% of the opening area at the upper end of the throttling fluid 61. In this embodiment, the throttling fluid 61 is cylindrical, forming a cylindrical hole, and the regulating valve disc 62 is located inside this cylindrical hole. The area of ​​this cylindrical hole is the cross-sectional area of ​​the nominal diameter of the cylindrical hole. In other cases, this percentage can also be other values, but it is between 3% and 10%. By setting this gap, when the regulating valve disc 62 is blown to the uppermost end of the regulating body 61, the air valve still has a certain amount of exhaust volume, preventing the main valve disc 14 from prematurely blocking the second opening 21 and causing water hammer when closing the valve.

[0047] A filter screen 3 is also installed on the upper side of the adjusting body 6, and a protective cover 4 is placed on top of the filter screen 3. The guide shaft 63 is connected to the protective cover 4. Specifically, the upper end of the guide shaft 63 passes through the protective cover 4 and is fixed by a locking nut. The protective cover 4 is located on the uppermost side of the air valve and is used to prevent dust from entering the valve cavity. When the air valve is installed outdoors, it can also prevent rainwater from entering the air valve. Several long screws 5 are connected around the protective cover 4. The long screws 5 pass through the protective cover 4 and are connected to the valve cover 2. The long screws 5 fix the filter screen 3 and the adjusting body 6 between the protective cover 4 and the valve cover 2. Several through holes are opened on the filter screen 3 to prevent small animals and flying insects from entering the air valve. On the other hand, when the water supply is stopped and the air valve is drawing in air, it prevents dead branches, leaves and other debris from being sucked in.

[0048] In this embodiment, the sewage air valve for preventing water hammer also includes a connecting frame 16 fixedly arranged relative to the main valve disc 14. The axial center of the main valve disc 14 has an exhaust hole 142 communicating with the valve chamber 10 and the exhaust chamber 60. One end of the long connecting rod 13 near the main valve disc 14 is movably connected to the connecting frame 16, and a micro exhaust valve disc 18 is also provided at this end. The float ball 12 can also drive the micro exhaust valve disc 18 to move relative to the connecting frame 16 to open or close the exhaust hole 142 accordingly.

[0049] During the pipeline sewage transport process, the main valve disc 14 closes the second opening 21, the regulating valve disc 62 is located at the lowest side, and the vent chamber 60 is connected to the outside through the throttling orifice 611. Gas is released from the sewage in the valve chamber 10 and accumulates in the valve chamber 10. As the accumulated gas increases, the water level in the valve chamber 10 drops, the float 12 descends, and at the same time, the float 12 drives the long connecting rod 13 to move down. The long connecting rod 13 moves relative to the connecting frame 16 and is guided by the connecting frame 16. The micro-vent valve disc 18 located at one end of the long connecting rod 13 disengages from the vent hole 142, causing the vent hole 142 to open. The released gas is discharged through the vent hole 142 into the vent chamber 60 and finally discharged to the outside. The air valve releases a small amount of gas through the vent 142. As this gas is released, the water level in the valve chamber rises, causing the float 12 to move upwards. The float 12 then pushes the micro-discharge valve 18 to close the vent 142 via the long connecting rod 13. This process is repeated to release the gas precipitated from the wastewater through the vent 142. The long connecting rod 13 is movably connected to the connecting frame 16, which guides and limits the long connecting rod 13 and the micro-discharge valve 18, allowing the float 12 to promptly control the micro-discharge valve 18 to close or open the vent 142 based on the amount of gas precipitated in the valve chamber 10.

[0050] To improve the stability of the connection between the long connecting rod 13 and the float 12, a connecting sleeve 121 is installed on the float 12, and the lower end of the long connecting rod 13 is threadedly connected to the connecting sleeve 121 and locked with a nut.

[0051] As a further improvement, a valve disc connecting seat 141 is provided at the center of the main valve disc 14. One end of the valve disc connecting seat 141 extends to the upper side of the main valve disc 14 and connects to the guide rod 15, while the other end connects to the connecting frame 16 and extends through one side of the connecting frame 16 to the inner side of the connecting frame 16. The end of the valve disc connecting seat 141 located inside the connecting frame 16 is also connected to the micro-exhaust valve seat 17. An exhaust port 142 is opened on the valve disc connecting seat 141, a guide rod through hole 151 communicating with one end of the exhaust port 142 is opened in the guide rod 15, and a through hole communicating with the other end of the exhaust port 142 is opened in the micro-exhaust valve seat 17.

[0052] Specifically, the valve disc connecting seat 141 and the guide rod 15 are sealed together. The outer side of the micro-discharge valve seat 17 is threaded to connect with the valve disc connecting seat 141. The axial center of the micro-discharge valve seat 17 is lined with rubber, and a through hole communicating with the exhaust port 142 is formed on the rubber lining. When the valve disc connecting seat 141 is connected to the connecting frame 16, one end of the valve disc connecting seat 141 extends through the connecting frame 16 to the inner side of the connecting frame 16. A locking washer and nut are tightened on this end, thus fixing the connecting frame 16 to the valve disc connecting seat 141.

[0053] Preferably, the micro-discharge valve 18 is slidably disposed relative to the connecting frame 16, with one end of the micro-discharge valve 18 located inside the connecting frame 16 and the other end passing through the connecting frame 16 and connected to the long connecting rod 13. Furthermore, an annular baffle protrudes from the end of the micro-discharge valve 18 located inside the connecting frame 16, and the annular baffle can abut against the inner side of the connecting frame 16. When gas is released from the micro-discharge wastewater, the long connecting rod 13 drives the micro-discharge valve 18 to move up and down. Guided by the connecting frame 16, the micro-discharge valve 18 connects to or separates from the micro-discharge valve seat 17, thereby correspondingly opening and closing the exhaust port 142. The micro-discharge valve seat 17 is lined with rubber. When the micro-discharge valve 18 is connected to the micro-discharge valve seat 17, the micro-discharge valve 18 connects to and presses against the rubber lining, providing a better sealing effect for the exhaust port 142. When the micro-discharge valve 18 moves downward, the annular baffle abuts against the connecting frame 16, thereby limiting the movement of the micro-discharge valve 18.

[0054] In one embodiment, a guide seat 25 is slidably sleeved on the guide rod 15. The guide seat 25 is located at the axial center of the second opening 21 and is fixedly disposed relative to the valve body 1 and the valve cover 2. Specifically, the guide seat 25 is connected to the valve cover 2 via a guide bracket 24. When the float 12 floats up and down, it simultaneously drives the long connecting rod 13, the main valve disc 14, and the guide rod 15 to move. The guide seat 25 guides the guide rod 15, causing the main valve disc 14 to move along the axial direction of the second opening 21. The upper end of the guide rod 15 passes through the guide seat 25, and a limiting ring is also connected to this end to limit the downward movement of the guide rod 15. A limiting pin is also connected to the upper end of the guide rod 15 to prevent the limiting ring from coming off.

[0055] To ensure the main valve disc 14 can better seal and close the second opening 21, a valve seat 22 is connected to the inner side of the second opening 21, and a main sealing ring 23 is embedded between the valve seat 22 and the inner wall of the second opening 21. When the main valve disc 14 moves upward to engage with the second opening 21, the main valve disc 14 specifically engages with the main sealing ring 23 for a sealing connection. The main sealing ring 23 can be a rubber sealing ring, which the main valve disc 14 can compress to improve the sealing effect.

[0056] In addition, a pressure relief port is provided on one side of the valve body 1, and a plug 19 is installed in the pressure relief port. Under normal use, the plug 19 seals the pressure relief port. When the air valve is being repaired, the plug 19 at the pressure relief port is removed to release the pressure in the valve cavity.

[0057] The terms "installation," "setup," "equipped with," and "connection" used in this application should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection; they can refer to a direct connection, an indirect connection via an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0058] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the inventive purpose of the present invention, designs a structure and embodiment similar to the technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A sewage air valve for preventing water hammer, comprising a valve body (1), wherein a valve cavity (10) is provided in the valve body (1), and a first opening (11) and a second opening (21) communicating with the valve cavity (10) are respectively provided on the lower side and the upper side of the valve body (1); Its features are: The valve chamber (10) is provided with a float (12) that can float up and down and a main valve disc (14) connected to the float (12) via a long connecting rod (13). When the float (12) floats up and down, it drives the main valve disc (14) to open or close the second opening (21). It also includes an adjusting body (6) located outside the second opening (21), the adjusting body (6) having an exhaust chamber (60) communicating with the valve chamber (10) through the second opening (21); a throttling fluid (61) is connected to the upper side of the adjusting body (6), and a plurality of throttling holes (611) are opened on the throttling fluid (61) to communicate with the exhaust chamber (60) and the outside; an adjusting valve disc (62) is provided inside the adjusting body (6), and an elastic member (64) is connected to one side of the adjusting valve disc (62); When the air valve exhausts air, the gas in the exhaust chamber (60) acts on the regulating valve disc (62), causing the regulating valve disc (62) to move relative to the regulating body (6) to adjust the exhaust area of ​​the throttle orifice (611); and during this movement, the force exerted on the regulating valve disc (62) by the gas in the exhaust chamber (60) is opposite in direction to the elastic force exerted on it by the elastic member (64).

2. The sewage air valve for preventing water hammer according to claim 1, characterized in that: There are multiple throttling orifices (611), each of which is an elongated or circular orifice and is circumferentially distributed on the throttling fluid (61).

3. The sewage air valve for preventing water hammer according to claim 1, characterized in that: The regulating valve disc (62) and the elastic element (64) are both sleeved and connected on the guide shaft (63), and the guide shaft (63) is fixedly set relative to the regulating body (6).

4. The sewage air valve for preventing water hammer according to any one of claims 1-3, characterized in that: A gap is provided between the regulating valve disc (62) and the inner wall of the throttling fluid (61), and the flow area of ​​the gap accounts for 3% to 10% of the upper opening area of ​​the throttling fluid (61).

5. The sewage air valve for preventing water hammer according to claim 1, characterized in that: It also includes a connecting frame (16) fixedly disposed relative to the main valve disc (14), an exhaust hole (142) communicating with the valve chamber (10) and the exhaust chamber (60) on the main valve disc (14), one end of the long connecting rod (13) near the main valve disc (14) being movably connected to the connecting frame (16) and a micro exhaust valve disc (18) is also provided at this end; the float (12) can drive the micro exhaust valve disc (18) to move relative to the connecting frame (16) to open or close the exhaust hole (142) accordingly.

6. The sewage air valve for preventing water hammer according to claim 5, characterized in that: A valve connecting seat (141) is provided at the center of the main valve disc (14). One end of the valve connecting seat (141) extends to the upper side of the main valve disc (14) and is connected to the guide rod (15). The other end passes through the connecting frame (16) and extends to the inner side of the connecting frame (16) and is connected to the micro-discharge valve seat (17).

7. The sewage air valve for preventing water hammer according to claim 6, characterized in that: The micro-discharge valve (18) is slidably disposed relative to the connecting frame (16). One end of the micro-discharge valve (18) is located inside the connecting frame (16), and the other end passes through the connecting frame (16) and is connected to the long connecting rod (13). The end of the micro-discharge valve (18) located inside the connecting frame (16) also has a protruding annular baffle, which can abut against the inner side of the connecting frame (16).

8. The sewage air valve for preventing water hammer according to claim 6, characterized in that: The exhaust port (142) is opened on the valve disc connecting seat (141), and a guide rod through hole (151) communicating with one end of the exhaust port (142) is opened in the guide rod (15), and a through hole communicating with the other end of the exhaust port (142) is opened in the micro exhaust valve seat (17).

9. The sewage air valve for preventing water hammer according to claim 6, characterized in that: A connecting guide seat (25) is slidably sleeved on the guide rod (15). The guide seat (25) is located at the axial center of the second opening (21) and is fixedly set relative to the valve body (1).

10. The sewage air valve for preventing water hammer according to any one of claims 5-9, characterized in that: The valve body (1) is sealed to the upper side of the valve cover (2), and the second opening (21) is opened on the valve cover (2); the valve seat (22) is connected to the inner side of the second opening (21), and the main sealing ring (23) is embedded between the valve seat (22) and the inner wall of the second opening (21), and the main sealing ring (23) can cooperate with the main valve disc (14) for sealing connection.

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