Integrated waterproof hammer type air valve

Abstract

The invention provides an integrated waterproof hammer type air valve which comprises a valve body and a valve cover, a flow limiting mechanism capable of controlling the exhaust speed according to the exhaust pressure difference is arranged on the valve cover, an inner support is arranged in the valve body, a floater is arranged on the inner support and can vertically float along the axis of the valve body along with the water level, and the floater comprises an upper floater body and a lower floater body. A boss is arranged on the side, opposite to the lower floater, of the upper floater, a through exhaust hole is formed in the upper floater, one end of the exhaust hole extends to the boss, a groove is formed in the side, opposite to the upper floater, of the lower floater, a through air inlet hole is formed in the lower floater, and one end of the air inlet hole extends to the groove. When the upper floater and the lower floater are separated, the air inlet hole is communicated with the exhaust hole through the groove, a large air inlet and outlet opening is formed in the top of the valve body, and a sealing ring matched with the upper floater is arranged on the large air inlet and outlet opening. Air exhausting and air supplementing of the pipeline can be achieved through the upper floater, the lower floater and the flow limiting mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of air valves, and in particular to an integrated anti-water hammer type air valve. Background Art

[0002] Air valves are widely installed vertically in various water pipelines. They play a role in safety protection and energy saving and consumption reduction of pipelines. They are key equipment on water pipelines. If the air valve cannot function properly, the pipeline may experience problems such as air blockage, pipe burst, negative pressure, or even equipment damage caused by water hammer during the water delivery process, which seriously affects the normal water supply, reduces the water supply efficiency, and even completely paralyzes the entire system. Domestic and foreign studies related to this issue have finally concluded that they are related to air valves. The problem can be solved by installing air valves in the pipelines in a reasonable manner.

[0003] Choose different forms of air valves according to the functional requirements of the water pipeline. At present, the air valves on the water pipeline can be divided into five categories according to their functions: trace exhaust valves, air inlet and exhaust valves, compound air inlet and exhaust valves, anti-water hammer air valves, and vacuum air supply valves. Among them, the anti-water hammer air valve is composed of an air inlet and exhaust valve, a trace exhaust valve, and a anti-water hammer buffer device. There are usually two structural types, namely a split structure and an integrated structure. The trace exhaust valve with a split structure is installed on the outside of the valve body, and the trace exhaust valve with an integrated structure adopts a built-in type. The integrated structure is smaller in size and lighter in weight than the split structure. However, the current anti-water hammer air valves with an integrated structure have a relatively complex structure. Summary of the invention

[0004] The purpose of the present invention is to address the defects of the prior art and provide an integrated anti-water hammer type air valve, which can achieve exhaust and air replenishment of the pipeline through an upper float, a lower float and a current limiting mechanism.

[0005] In order to solve the above technical problems, the present invention provides an integrated anti-water hammer type air valve, including a valve body and a valve cover on the top of the valve body, the valve cover is provided with a flow limiting mechanism, the flow limiting mechanism can control the exhaust speed according to the exhaust pressure difference, an inner support is provided in the valve body, a float is provided on the inner support, the float can float up and down along the axis of the valve body with the water level, the float includes an upper float and a lower float, a boss is provided on the side of the upper float opposite to the lower float, a through exhaust hole is provided in the upper float, and the exhaust hole One end of the valve body extends to the boss, a groove is provided on the side of the lower float opposite to the upper float, a penetrating air inlet is provided in the lower float, one end of the air inlet extends to the groove, when the upper float and the lower float are completely fitted, the lower end of the boss rests on the groove, and the exhaust hole is blocked by the groove; when the upper float and the lower float are separated, the air inlet is connected with the exhaust hole through the groove, a large inlet and exhaust port is provided on the top of the valve body, a sealing ring is provided on the large inlet and exhaust port, and the sealing ring is used to cooperate with the upper float to seal the large inlet and exhaust port.

[0006] In some embodiments, the lower float is provided with an additional air inlet hole, one end of the additional air inlet hole extends to the outer surface of the lower float, and the other end of the additional air inlet hole is communicated with the air inlet hole.

[0007] In some embodiments, a sealing plug installation hole is opened at the bottom of the groove, a sealing plug is installed in the sealing plug installation hole, the sealing plug is used to block the exhaust hole, a bottom hole is set at the bottom of the sealing plug installation hole, and the bottom hole is connected to the air inlet hole.

[0008] Furthermore, a plurality of sealing grooves are provided on the hole wall of the sealing plug installation hole, and the sealing grooves are in close contact with the sealing plug.

[0009] Furthermore, the sealing groove is in an inverted cone shape.

[0010] In some embodiments, a lower connecting hole is defined in the lower float, an upper connecting hole is defined in the upper float, a connecting rod is disposed in the lower connecting hole, one end of the connecting rod is connected to the upper connecting hole, the other end of the connecting rod extends out of the lower connecting hole and a limiting ring is disposed thereon, the diameter of the limiting ring is larger than the diameter of the lower connecting hole, the lower float can slide axially along the connecting rod, and when the upper float and the lower float are fully fitted, there is a gap between the limiting ring and the lower opening of the lower connecting hole.

[0011] In some embodiments, the upper end surface of the upper float is conical, and multiple circles of sealing bodies are set on the inner side of the sealing ring. The multiple circles of sealing bodies are arranged axially along the valve body. The closer the sealing body is to the valve cover, the smaller the inner diameter of the sealing body is. The sealing body is used for linear sealing with the upper float.

[0012] Preferably, the inner wall of the valve cover close to the lower end is tapered, so that the upper end surface of the upper float can be tightly pressed against the inner wall of the valve cover.

[0013] In some embodiments, the lower end surface of the lower float is an inverted cone-shaped surface, and a plurality of float holes are provided on the lower end surface of the lower float, and the float holes are blind holes.

[0014] In some embodiments, the flow limiting mechanism includes a buffer box, an exhaust window is opened on the top of the buffer box, a protective cover is fixedly arranged on the top of the buffer box, a guide shaft is arranged on the protective cover, a flow limiting plate is slidably arranged on the guide shaft, a flow limiting hole is opened on the flow limiting plate, and the flow limiting plate is attached to or separated from the exhaust window according to the exhaust pressure difference, thereby achieving flow limiting.

[0015] The beneficial effects of the present invention are:

[0016] 1. The present invention provides an inner support so that when the pipeline is normally filled with water, the inner support can support the float, and the air in the pipeline can bypass the float and be discharged smoothly from the valve cover; a flow limiting mechanism is provided so that when the air pressure in the pipeline is too high, the discharge speed of the air in the pipeline is limited to avoid water hammer; a sealing ring is provided so that after the pipeline is filled with water, the float can be against the sealing ring under the action of buoyancy to seal the valve body; the float is provided as an upper float and a lower float, so that after the air is precipitated out of the water, the lower float is separated from the upper float under the action of gravity, so that the exhaust hole is opened, and the air can be discharged from the exhaust hole through the air inlet hole.

[0017] 2. The present invention provides an additional air inlet hole on the lower float, and the air inlet hole can be connected with the air outside the lower float through the additional air inlet hole, so as to avoid the formation of a high-pressure air bag in the air inlet hole and avoid a large impact force when the pressure fluctuates.

[0018] 3. The present invention opens a sealing plug mounting hole in the groove, and installs the sealing plug in the sealing plug mounting hole. The sealing effect is better when the sealing plug is in contact with the exhaust hole. A bottom hole is provided at the bottom of the sealing plug mounting hole, and the bottom hole is connected with the air inlet hole. When the sealing plug is installed in the sealing plug mounting hole, the air in the sealing plug mounting hole can be discharged through the bottom hole. The installation is convenient and the sealing plug is not easy to fall off.

[0019] 4. The present invention ensures the sealing performance of the sealing plug by arranging a plurality of sealing grooves in the sealing plug mounting hole.

[0020] 5. The present invention connects the upper float and the lower float through a connecting rod, so that after the upper float and the lower float are connected, the guide length of the upper float and the lower float becomes longer, the guiding performance is better, and the up and down activities are not easily blocked, ensuring that the float can be raised and lowered flexibly during operation, and can avoid the upper float and the lower float from tilting and getting stuck; in addition, by arranging a limit ring on the connecting rod, the relative separation between the upper float and the lower float can be limited, avoiding the boss and the groove from being completely separated.

[0021] 6. The upper float and the sealing ring of the present invention adopt linear sealing, which has better sealing performance.

[0022] 7. The inner wall of the valve cover near the lower end of the present invention is tapered. When subjected to high pressure, the upper float sealing surface will contact the sealing ring of the large inlet and exhaust port and the valve cover at the same time. At this time, the valve cover is under pressure, and the compression of the sealing ring is small, which will not damage the sealing ring, and can effectively avoid sealing failure caused by excessive compression of the sealing ring.

[0023] 8. The lower end surface of the lower float of the present invention is provided with a plurality of floating holes which are blind holes. When water enters the valve body, the floating holes are not completely filled with water, and a portion of air will remain at the upper end of the floating holes, thereby increasing the buoyancy of the lower float. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the valve body of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the float of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the upper float of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the lower float of the present invention;

[0029] Figure 6 for Figure 5 Middle AA section view;

[0030] Figure 7 It is a structural schematic diagram of another cross section of the lower float of the present invention;

[0031] Figure 8 It is a schematic diagram of the structure of the sealing plug of the present invention;

[0032] Fig. 9 It is a structural schematic diagram of the sealing ring of the present invention;

[0033] Fig.10 for Fig. 9 Enlarged view of point B in the middle;

[0034] Fig.11 This is a schematic diagram of air discharge when the pipeline of the present invention is normally filled with water;

[0035] Fig.12 This is a schematic diagram of the state after the pipeline of the present invention is filled with water;

[0036] Fig.13 A schematic diagram of the air separated out from the water of the present invention being discharged through the exhaust hole;

[0037] Fig.14 It is an enlarged schematic diagram of the air separated out from the water being discharged through the exhaust hole of the present invention;

[0038] Fig.15 It is a schematic diagram of pipeline air replenishment when negative pressure occurs in the pipeline of the present invention;

[0039] Fig.16 It is a schematic diagram of air discharge when the pipeline of the present invention is converted from the air supply state to the exhaust state and the exhaust pressure difference is less than 5KPa;

[0040] Fig.17 It is a schematic diagram of air discharge when the pipeline of the present invention is converted from an air supply state to an exhaust state and the exhaust pressure difference is greater than 5KPa.

[0041] Reference numerals: valve body 1; guide rib 11; inner support 12; large inlet and outlet 13; sealing ring 14; sealing body 141;

[0042] Float 2; upper float 21; boss 211; exhaust hole 212; upper connecting hole 213; lower float 22; groove 221; air inlet hole 222; additional air inlet hole 223; sealing plug mounting hole 224; sealing plug 225; bottom hole 226; slot 227; lower connecting hole 228; floating hole 229; connecting rod 23; limiting ring 231;

[0043] Valve cover 3;

[0044] Flow limiting mechanism 4; buffer box 41; exhaust window 411; protective cover 42; guide shaft 43; flow limiting plate 44; flow limiting hole 441. DETAILED DESCRIPTION

[0045] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0046] like Figure 1As shown, the present invention provides an integrated anti-water hammer type air valve, comprising a valve body 1 and a valve cover 3 on the top of the valve body 1, the valve cover 3 is fixedly connected to the top of the valve body 1 by bolts, a flow limiting mechanism 4 is arranged on the valve cover 3, the flow limiting mechanism 4 can control the exhaust speed according to the exhaust pressure difference, that is, when the air pressure in the pipeline is relatively large, the flow limiting mechanism 4 will limit the exhaust speed of the air in the pipeline to prevent water hammer; an inner support 12 is arranged in the valve body 1, the inner support 12 and the valve body 1 are integrally cast, a hole is opened in the middle of the inner support 12, a float 2 is arranged on the inner support 12, the float 2 can float up and down along the axis of the valve body 1 with the water level, the float 2 can be made of PP (polypropylene), the float 2 includes an upper float 21 and a lower float 22, a boss 211 is arranged on the side opposite to the lower float 22, the boss 211 is coaxially arranged with the upper float 21, and the upper float 21 An exhaust hole 212 is provided inside the valve body 1, and one end of the exhaust hole 212 extends to the boss 211. A groove 221 is provided on the side of the lower float 22 opposite to the upper float 21, and the groove 221 is coaxially arranged with the lower float 22. An air inlet 222 is provided inside the lower float 22, and one end of the air inlet 222 extends to the groove 221. When the upper float 21 and the lower float 22 are completely fitted, the lower end of the boss 211 is against the groove 221, and the exhaust hole 212 is blocked by the groove 221. When the upper float 21 and the lower float 22 are separated, the air inlet 222 is communicated with the exhaust hole 212 through the groove 221. A large air inlet and exhaust port 13 is provided on the top of the valve body 1, and a sealing ring 14 is arranged on the large air inlet and exhaust port 13. The sealing ring 14 is fixedly pressed on the top of the valve body 1 by the valve cover 3, and the sealing ring 14 is used to cooperate with the upper float 21 to seal the large air inlet and exhaust port 13.

[0047] It can be understood that the present invention provides an inner support 12 so that when the pipeline is normally filled with water, the inner support 12 can support the float 2, and the air in the pipeline can bypass the float 2 and be discharged smoothly from the valve cover 3; by providing a flow limiting mechanism 4, when the air pressure in the pipeline is too high, the discharge speed of the air in the pipeline is limited to avoid water hammer; by providing a sealing ring 14, after the pipeline is filled with water, the float 2 can be against the sealing ring 14 under the action of buoyancy to seal the valve body 1; by setting the float 2 as an upper float 21 and a lower float 22, after the air is precipitated out of the water, the lower float 22 is separated from the upper float 21 under the action of gravity, so that the exhaust hole 212 is opened, and the air can be discharged from the exhaust hole 212 through the air inlet hole 222.

[0048] In some embodiments, the boss 211 and the groove 221 are both cylindrical, the air inlet 222 and the air outlet 212 are both opened parallel to the axial direction of the valve body 1 , and the air inlet 222 and the lower float 22 are arranged in a staggered axis.

[0049] In some embodiments, Figure 2As shown, a plurality of guide ribs 11 are integrally provided on the inner wall of the valve body 1 , and the float 2 can move up and down along the guide ribs 11 , so that the float 2 can accurately reach the designed position when moving up and down, ensuring that the large air inlet and outlet ports 13 are smoothly sealed.

[0050] To avoid the formation of air pockets in the air inlet 222, in some embodiments, as Figure 6 As shown, the lower float 22 is provided with an additional air inlet hole 223 , which is arranged horizontally, that is, perpendicular to the axis of the lower float 22 , one end of the additional air inlet hole 223 extends to the outer surface of the lower float 22 , and the other end of the additional air inlet hole 223 is connected to the air inlet hole 222 .

[0051] It is understandable that by providing an additional air inlet hole 223 on the lower float 22, the air inlet hole 222 can be connected to the air outside the lower float 22 through the additional air inlet hole 223, which can avoid the formation of a high-pressure air bag in the air inlet hole 222 and avoid a large impact force when the pressure fluctuates.

[0052] In some embodiments, Figure 5 , 6 As shown in FIG. 8 , a sealing plug mounting hole 224 is provided at the bottom of the groove 221 , a sealing plug 225 is installed in the sealing plug mounting hole 224 , the sealing plug 225 is used to block the exhaust hole 212 , a bottom hole 226 is provided at the bottom of the sealing plug mounting hole 224 , and the bottom hole 226 is connected to the air inlet hole 222 .

[0053] It can be understood that by opening a sealing plug mounting hole 224 in the groove 221 and installing a sealing plug 225 in the sealing plug mounting hole 224, the sealing effect is better when the sealing plug 225 is in contact with the exhaust hole 212. By setting a bottom hole 226 at the bottom of the sealing plug mounting hole 224, the bottom hole 226 is connected to the air inlet hole 222, so that when the sealing plug 225 is installed in the sealing plug mounting hole 224, the air in the sealing plug mounting hole 224 can be discharged through the bottom hole 226, which makes installation convenient and makes the sealing plug 225 not easy to fall off.

[0054] Furthermore, a plurality of sealing grooves 227 are provided on the hole wall of the sealing plug installation hole 224, and the sealing grooves 227 are in close contact with the sealing plug 225. By providing a plurality of sealing grooves 227 in the sealing plug installation hole 224, the sealing performance of the sealing plug 225 is ensured.

[0055] Furthermore, the sealing groove 227 is in an inverted cone shape, which can further improve the sealing performance of the sealing plug 225.

[0056] In some embodiments, Figure 5 As shown, a lower connecting hole 228 is provided in the lower float 22. Figure 4 As shown, an upper connecting hole 213 is provided in the upper float 21. Figure 3As shown, a connecting rod 23 is arranged in the lower connecting hole 228, one end of the connecting rod 23 is threadedly connected to the upper connecting hole 213, and the other end of the connecting rod 23 extends out of the lower connecting hole 228 and is provided with a limiting ring 231. The diameter of the limiting ring 231 is larger than the diameter of the lower connecting hole 228, and the lower float 22 can slide axially along the connecting rod 23. When the upper float 21 and the lower float 22 are completely fitted, there is a gap between the limiting ring 231 and the lower hole opening of the lower connecting hole 228.

[0057] It can be understood that the upper float 21 and the lower float 22 are connected by the connecting rod 23, so that after the upper float 21 and the lower float 22 are connected, the guiding length of the upper float 21 and the lower float 22 becomes longer, the guiding performance is better, and the up and down activities are not easily blocked, thereby ensuring that the float 2 can be raised and lowered flexibly during operation, and avoiding the upper float 21 and the lower float 22 from tilting and getting stuck; in addition, by arranging a limit ring 231 on the connecting rod 23, the relative separation between the upper float 21 and the lower float 22 can be limited, thereby avoiding the boss 211 and the groove 221 from being completely separated.

[0058] It should be noted that a baffle can be integrally provided at the lower end of the connecting rod 23, and a limiting ring 231 is threadedly connected to the connecting rod 23. The limiting ring 231 can be adjusted between the baffle and the lower opening of the lower connecting hole 228, thereby adjusting the maximum separation distance between the upper float 21 and the lower float 22.

[0059] In some embodiments, Fig. 9 , 10 The upper end surface of the upper float 21 is conical, and a plurality of rings of sealing bodies 141 are arranged inside the sealing ring 14. The plurality of rings of sealing bodies 141 are arranged axially along the valve body 1. The closer the sealing body 141 is to the valve cover 3, the smaller the inner diameter is. The sealing body 141 is used for linear sealing with the upper float 21. The upper float 21 and the sealing ring 14 adopt linear sealing, which has better sealing performance.

[0060] Preferably, the inner wall of the valve cover 3 near the lower end is tapered, so that the upper end surface of the upper float 21 can be tightly pressed against the inner wall of the valve cover 3 .

[0061] It is understandable that when subjected to high pressure, the sealing surface of the upper float 21 will contact the sealing ring 14 of the large inlet and outlet port 13 and the valve cover 3 at the same time. At this time, the valve cover 3 is under pressure, and the compression of the sealing ring 14 is small, which will not damage the sealing ring 14, and can effectively avoid sealing failure caused by excessive compression of the sealing ring 14.

[0062] In some embodiments, Figure 7 As shown, the lower end surface of the lower float 22 is an inverted conical surface, and a plurality of float holes 229 are provided on the lower end surface of the lower float 22, and the float holes 229 are blind holes.

[0063] It is understandable that, since the float hole 229 is a blind hole, when water enters the valve body 1 , the float hole 229 will not be completely filled with water, and a portion of air will remain at the upper end of the float hole 229 , thereby increasing the buoyancy of the lower float 22 .

[0064] Likewise, the inner support 12 is in an inverted cone shape, and the lower end surface of the lower float 22 can cooperate with the inner support 12 .

[0065] In some embodiments, Figure 1 As shown, the flow limiting mechanism 4 includes a buffer box 41, an exhaust window 411 is opened on the top of the buffer box 41, a protective cover 42 is fixedly arranged on the top of the buffer box 41, a guide shaft 43 is arranged on the protective cover 42, a flow limiting plate 44 is slidably arranged on the guide shaft 43, a flow limiting hole 441 is opened on the flow limiting plate 44, and the flow limiting plate 44 is attached to or separated from the exhaust window 411 according to the exhaust pressure difference, thereby realizing flow limiting.

[0066] The working principle of this integrated anti-water hammer type air valve is:

[0067] 1. When the pipeline is filled with water normally, the anti-water hammer air valve will exhaust a large amount of air normally:

[0068] like Fig.11 As shown, when the pipeline is normally filled with water, the valve body 1 is not yet filled with water, and the float 2 is supported by the inner support 12. At this time, the flow rate of water in the pipeline generally does not exceed 0.3-0.5m / s, and the exhaust pressure difference does not exceed 5KPa (the pressure difference can be defined according to working conditions). During the exhaust process, the flow limiting plate 44 will not be closed, and the valve is fully opened for rapid low-pressure exhaust.

[0069] 2. The pipe is filled with water, the air in the pipe is exhausted, and the large and small inlet and outlet ports are closed:

[0070] like Fig.12 As shown, after the air in the pipeline is exhausted, water enters the valve body 1, the float 2 floats up, and the upper float 21 floats up and contacts the sealing ring 14 and the valve cover 3 of the large air inlet and outlet 13, thereby sealing the large air inlet and outlet 13. The air vent 212 of the upper float 21 contacts the sealing plug 225 of the lower float 22, thereby sealing the air vent 212.

[0071] 3. During the water delivery process, the air released from the water is discharged through the exhaust hole 212:

[0072] like Fig.13 , 14As shown, during the normal water delivery process of the pipeline, a small amount of gas precipitated from the water will gather at the upper part of the inner cavity of the valve body 1, gradually replacing the water in the inner cavity. When the gas accumulates to a certain amount, the lower float 22 will lose buoyancy and descend under the action of gravity. The exhaust hole 212 of the upper float 21 is disengaged from the sealing plug 225 of the lower float 22, and the air precipitated from the water is discharged through the exhaust hole 212. The inner cavity of the valve body 1 is in a pressure-maintaining state, and the upper float 21 maintains a seal with the sealing ring 14 and the valve cover 3 under the action of pressure, and the upper float 21 will not fall. During the air discharge process, the water level gradually rises, the lower float 22 floats upward, reseals the exhaust hole 212, and the exhaust stops. This cycle continues, and no air pockets will be formed in the pipeline.

[0073] 4. When negative pressure occurs in the pipeline, add a large amount of air to eliminate the negative pressure:

[0074] like Fig.15 As shown, when the water pump stops, the driving force of the pipeline (the pressure of the water pump) disappears, and the water column in the pipeline flows under its own inertia. Due to the different elevations of the pipeline, the flow rate decreases rapidly at the rising part of the pipeline, while the flow rate decreases slowly or does not decrease at the flat or descending part of the pipeline. Therefore, at the turning points of the trend changes of these pipelines, negative pressure is formed due to the difference in water column flow rate. When the negative pressure is large, vacuum water column separation is formed. At this time, the anti-water hammer type air valve at the turning point opens quickly under the action of negative pressure (the upper float 21 and the small float 2 fall quickly), and a large amount of air quickly enters the pipeline to balance the pressure difference in the pipeline, avoiding the formation of a large negative pressure to damage the pipeline;

[0075] Or when the water in the pipe needs to be drained during pipeline maintenance, negative pressure is generated. Air is sucked in through the anti-water hammer air valve to avoid negative pressure.

[0076] 5. When the air supply state is converted to the exhaust state and the exhaust pressure difference is less than 5KPa (the pressure difference can be defined according to the working condition requirements), the flow restriction plate 44 is not closed during the large amount of exhaust:

[0077] When the water column in the pipeline is broken due to reasons such as pump stop, air will be quickly added to avoid negative pressure in the pipeline. When the separated water column begins to flow back under the action of negative pressure and gravity, the pressure difference in the waterproof hammer type air valve changes from negative pressure to positive pressure, that is, the air filling state changes to the exhaust state. Fig.16 shown.

[0078] 6. When the exhaust pressure difference exceeds the set value of 5KPa (the pressure difference can be defined according to the working conditions), the flow limiter 44 in the anti-water hammer buffer device will be closed during the exhaust process. Fig.17 As shown, the exhaust speed is limited by the flow limiting plate 44, thereby reducing the flow rate of water in the pipeline and avoiding the generation of water hammer.

[0079] When the exhaust pressure difference exceeds 5KPa (the pressure difference can be defined according to the working conditions), the flow limiting mechanism 4 starts to work to limit the exhaust flow. The flow rate in the flow limiting state is 5%-10% of the flow rate in the non-flow limiting state with the same pressure difference (which can be defined according to the working conditions). The inhaled air is slowly discharged, and the air bag in the pipeline is used to effectively buffer the instantaneous pressure increase caused by the water column bridging type to prevent water hammer.

[0080] In a deep well pump room, a relatively long water intake pipe is filled with air. When water is quickly pumped into the pipe, if the air in the pipe is discharged at high speed through the air valve, the water in the pipe will hit the valve or pipe at high speed to form a more serious water hammer. The flow limiting mechanism 4 can effectively reduce the speed of air discharge, thereby reducing the pressure fluctuation in the system and avoiding damage to equipment and pipes caused by water hammer.

[0081] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An integrated anti-water hammer air valve, characterized in that: The invention comprises a valve body (1) and a valve cover (3) on the top of the valve body (1), wherein a flow limiting mechanism (4) is arranged on the valve cover (3), and the flow limiting mechanism (4) can control the exhaust speed according to the exhaust pressure difference, an inner support (12) is arranged in the valve body (1), a float (2) is arranged on the inner support (12), and the float (2) can float up and down along the axis of the valve body (1) according to the water level, and the float (2) comprises an upper float (21) and a lower float (22), a boss (211) is arranged on the side of the upper float (21) opposite to the lower float (22), a through exhaust hole (212) is arranged in the upper float (21), one end of the exhaust hole (212) extends to the boss (211), and the lower float (22) is opposite to the upper float (21). A groove (221) is provided on one side, and an air inlet (222) is provided in the lower float (22). One end of the air inlet (222) extends to the groove (221). When the upper float (21) and the lower float (22) are completely fitted together, the lower end of the boss (211) abuts against the groove (221), and the exhaust hole (212) is blocked by the groove (221). When the upper float (21) and the lower float (22) are separated, the air inlet (222) is connected to the exhaust hole (212) through the groove (221). A large air inlet and exhaust port (13) is provided on the top of the valve body (1). A sealing ring (14) is provided on the large air inlet and exhaust port (13). The sealing ring (14) is used to cooperate with the upper float (21) to seal the large air inlet and exhaust port (13).

2. The integrated anti-water hammer type air valve according to claim 1, characterized in that: The lower float (22) is provided with an additional air inlet hole (223), one end of the additional air inlet hole (223) extends to the outer surface of the lower float (22), and the other end of the additional air inlet hole (223) is communicated with the air inlet hole (222).

3. The integrated anti-water hammer type air valve according to claim 1 or 2, characterized in that: A sealing plug mounting hole (224) is provided at the bottom of the groove (221), a sealing plug (225) is installed in the sealing plug mounting hole (224), the sealing plug (225) is used to block the exhaust hole (212), a bottom hole (226) is provided at the bottom of the sealing plug mounting hole (224), and the bottom hole (226) is communicated with the air inlet hole (222).

4. The integrated anti-water hammer type air valve according to claim 3, characterized in that: A plurality of sealing grooves (227) are provided on the hole wall of the sealing plug installation hole (224), and the sealing grooves (227) are in close contact with the sealing plug (225).

5. The integrated anti-water hammer type air valve according to claim 4, characterized in that: The sealing groove (227) is in an inverted cone shape.

6. The integrated anti-water hammer type air valve according to claim 1 or 2, characterized in that: A lower connecting hole (228) is provided in the lower float (22), an upper connecting hole (213) is provided in the upper float (21), a connecting rod (23) is arranged in the lower connecting hole (228), one end of the connecting rod (23) is connected to the upper connecting hole (213), the other end of the connecting rod (23) extends out of the lower connecting hole (228) and is provided with a limiting ring (231), the diameter of the limiting ring (231) is larger than the diameter of the lower connecting hole (228), the lower float (22) can slide axially along the connecting rod (23), and when the upper float (21) and the lower float (22) are completely fitted, there is a gap between the limiting ring (231) and the lower opening of the lower connecting hole (228).

7. The integrated anti-water hammer type air valve according to claim 1 or 2, characterized in that: The upper end surface of the upper float (21) is conical, and a plurality of circles of sealing bodies (141) are arranged on the inner side of the sealing ring (14). The plurality of circles of the sealing bodies (141) are arranged axially along the valve body (1), and the closer the sealing body (141) is to the valve cover (3), the smaller the inner diameter of the sealing body (141) is. The sealing body (141) is used for linear sealing with the upper float (21).

8. The integrated anti-water hammer type air valve according to claim 7, characterized in that: The inner wall of the valve cover (3) near the lower end is tapered, so that the upper end surface of the upper float (21) can be tightly pressed against the inner wall of the valve cover (3).

9. The integrated anti-water hammer type air valve according to claim 1 or 2, characterized in that: The lower end surface of the lower float (22) is in the form of an inverted cone. A plurality of float holes (229) are provided on the lower end surface of the lower float (22), and the float holes (229) are blind holes.

10. The integrated anti-water hammer type air valve according to claim 1 or 2, characterized in that: The flow limiting mechanism (4) comprises a buffer box (41), the top of the buffer box (41) is provided with an exhaust window (411), the top of the buffer box (41) is fixedly provided with a protective cover (42), the protective cover (42) is provided with a guide shaft (43), a flow limiting plate (44) is slidably provided on the guide shaft (43), and the flow limiting plate (44) is provided with The flow limiting hole (441) is provided, wherein the flow limiting plate (44) is attached to or separated from the exhaust window (411) according to the exhaust pressure difference. This achieves current limiting.

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