Adjustable waterproof hammer buffer air valve

Abstract

The adjustable waterproof hammer buffering air valve comprises a valve body and an upper valve cover, the upper valve cover is located at the top of the valve body, the bottom of the upper valve cover is fixedly connected with the top of the valve body, an upper cavity is formed in the upper valve cover, and a spring support is fixedly connected to the top of the inner wall of the upper valve cover; a spring is fixedly connected to the bottom of the spring support, an adjustable exhaust hole plate is fixedly connected to the bottom of the spring, an air inlet hole plate is arranged at the bottom of the adjustable exhaust hole plate, bolts are arranged in the adjustable exhaust hole plate and the air inlet hole plate, and the adjustable exhaust hole plate is connected with the air inlet hole plate through the bolts. The combined type air valve has the advantages that gas accumulated in a pipeline can be timely discharged, too fast exhaust in the water column bridging process is avoided, the defects that in the later period of empty pipe water filling and normal operation of an existing combined type air valve, high-pressure gas discharging is slow, and too fast exhaust is achieved in the water column bridging process are overcome, and therefore the problem of pipeline pressure oscillation is avoided.

Description

Technical Field

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

[0002] Air valves are widely used in water supply and water delivery pressure pipelines. The ideal air valve performance includes the following three points: First, when negative pressure occurs in the pipeline system, it can timely intake air to supplement the pipeline pressure and avoid the accident of negative pressure suction and collapse of the pipeline; Second point: When the empty pipe is filled with water and operating normally, the gas in the pipe can be discharged to avoid air pocket accumulation, reduce the water-passing section or increase the local resistance of the pipe. It is required that the buffer exhaust port can be opened at any pressure during normal operation to perform buffer exhaust, and continuous exhaust between gas and water can be achieved; The third point: When the pipeline system experiences hydraulic transients such as stopping the pump or closing the valve, the air valve is required to be exhausted after negative pressure intake, so that the air bag can play a buffering role in the process of water column bridging, avoiding excessive pressure rise caused by excessive gas exhaust during water column bridging.

[0003] Problems with the existing technology: The existing composite air valve can usually meet the first air intake requirement, but cannot meet the second and third requirements at the same time. The reason for not meeting the second requirement: Under high pressure, the existing air valve can usually only exhaust air through micropores. If the exhaust port becomes larger, the pressure will lift the valve core or float, resulting in the closure of the exhaust port and failure to exhaust normally. Usually, the size of the micropores is only 2mm-5mm. During normal operation, due to the high pressure in the pipeline, which is usually called "high-pressure gas", the exhaust volume of the micropores is too small, and the accumulated gas in the pipeline cannot be removed in time, thereby increasing local resistance, or the gas will produce pressure oscillations with the movement of water flow. The reason for not meeting the third requirement: The existing anti-water hammer buffer exhaust valve has a minimum switching pressure of 0.2m. However, due to the large port used in the initial exhaust stage, the exhaust speed is very fast, and the air bag pressure in the pipeline is difficult to rise. In some working conditions, it cannot even reach 0.2m, which is equivalent to the large port used entirely in the entire exhaust process, and it is not switched to the small port at all, resulting in excessive water column bridging pressure increase.

[0004] Therefore, there is an urgent need for an air valve with stable performance, which can exhaust air in time even under high-pressure conditions, and whose buffer exhaust switching pressure can be adjusted arbitrarily according to engineering needs, or even only allow buffer exhaust. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides an adjustable water hammer prevention buffer air valve, which has the advantages of timely removing gas accumulated in the pipeline and avoiding excessive exhaust during the water column filling process. It solves the shortcomings of the existing composite air valve in the late stage of empty pipe filling with water and in normal operation, such as slow removal of "high-pressure gas" and excessive exhaust during the water column filling process, thereby avoiding the problem of pipeline pressure oscillation.

[0006] The present invention is implemented in this way. An adjustable anti-water hammer buffer air valve includes a valve body and an upper valve cover. The upper valve cover is located at the top of the valve body. The bottom of the upper valve cover is fixedly connected to the top of the valve body. An upper cavity is opened inside the upper valve cover. The top of the inner wall of the upper valve cover is fixedly connected to a spring bracket. The bottom of the spring bracket is fixedly connected to a spring. The bottom of the spring is fixedly connected to an adjustable exhaust orifice plate. The bottom of the adjustable exhaust orifice plate is provided with an air inlet orifice plate. Bolts are provided in the adjustable exhaust orifice plate and the air inlet orifice plate. The adjustable exhaust orifice plate is connected to the air inlet orifice plate by bolts. The air inlet orifice plate An exhaust port is provided inside the plate, a piston guide bracket is fixedly connected to the bottom of the air inlet plate, the piston can move freely up and down in the piston guide bracket, a hollow pipe diameter is provided inside the piston, and the top of the hollow pipe diameter is connected to the exhaust port, a diaphragm is fixedly connected to the bottom of the piston, a casing cover plate is fixedly connected to the bottom of the diaphragm, a float is provided at the bottom of the casing cover plate, the top of the float passes through the casing cover plate and is in sealing contact with the bottom of the piston, the diaphragm, the piston and the casing cover plate form a control chamber, an exhaust port is provided on the surface of the upper valve cover, and a lower chamber is provided inside the valve body.

[0007] As a preferred embodiment of the present invention, a piston guide bracket is sleeved on the surface of the piston, the top of the piston guide bracket is fixedly connected to the bottom of the air inlet plate, and a movable space for the movement of the piston is opened inside the piston guide bracket.

[0008] As a preferred embodiment of the present invention, the bottom of the casing cover plate is fixedly connected to the casing, the casing is surrounded by grille-type water inlets, the float is located inside the casing, the bottom of the casing is fixedly connected to a lower bottom plate, the lower bottom plate is a grille hole plate, and the surface of the lower bottom plate is fixedly connected to the bottom of the inner wall of the valve body.

[0009] As a preferred embodiment of the present invention, there are multiple exhaust holes, which are evenly distributed on the surface of the upper valve cover, and the upper cavity is connected to the outside through the exhaust holes.

[0010] As a preferred embodiment of the present invention, an air inlet plate guide bracket for limiting the position of the air inlet plate is sleeved on the surface of the air inlet plate, and the surface of the air inlet plate guide bracket is fixedly connected to the inner wall of the valve body.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The present invention is provided with a valve body, an upper valve cover, a buffer exhaust port, a spring, an adjustable exhaust hole plate, an air inlet hole plate, a piston, a diaphragm, a casing cover plate, a float ball, and a casing for coordinated use, and the lower part of the valve body is connected to a water pipeline. When the water pipeline is operating normally and there is no air, water flows into the lower cavity through the lower bottom plate (the lower bottom plate is a grid structure, which can prevent floating objects in the pipeline water from entering the air valve and avoid clogging of the air valve) and the casing grid, immersing the outside of the float ball, and then immersing the piston through the lower cavity. When there is no air in the pipeline, the lower cavity is filled with water, and the float ball is lifted up by the buoyancy, sealing the lower end of the hollow pipe diameter. At this time, the piston and the float ball are both lifted up, and the buffer exhaust port of the air valve is closed.

[0012] When there is negative pressure in the pipeline, the air inlet plate, adjustable exhaust plate, piston and float drop together, and the air inlet opens to achieve rapid air intake. When there is gas in the pipeline, the float drops, and the lower end of the piston hollow aperture opens. The control chamber surrounded by the diaphragm, piston and casing cover is connected to the outside atmosphere. The pressure in the control chamber drops rapidly to "low-pressure gas", and the outside of the control chamber is "high-pressure gas" of the pipeline. The diaphragm and the piston are forced to move downward, and the buffer exhaust port is opened to exhaust. As long as there is gas in the pipeline, no matter how high the pressure is, the float will fall, thereby opening the buffer exhaust port. In addition, since the buffer exhaust port diameter can be adjusted according to demand, high-pressure buffer exhaust can be achieved. During the hydraulic transient process, after the air valve completes air intake, when the switching pressure is not 0 and the pipeline airbag pressure is higher than the switching pressure, the air inlet orifice plate is lifted up by the pressure difference to close the large exhaust port (air inlet). When the switching pressure is set to 0, after the air valve completes air intake, the air inlet orifice plate will immediately reset and close the large exhaust port (air inlet) under the tension of the spring, allowing only buffer exhaust. During the water column bridging process, the airbag is discharged through the buffer exhaust port. The size of the buffer exhaust port can be adjusted according to demand, so that the airbag plays a buffering role during the water column bridging process to avoid excessive pressure rise caused by excessive gas exhaust.

[0013] 3. This air valve can realize high-speed air intake and timely pressure replenishment. Under any high pressure, it can exhaust according to the required exhaust aperture and can realize continuous exhaust of air and water. During hydraulic transient process, the air bag can play a buffering role in the process of water column bridging, avoiding excessive pressure rise caused by excessive exhaust and water column bridging. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a component name structure diagram provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of the gas outlet of the buffer exhaust port of the valve body provided by an embodiment of the present invention; Figure 3 The embodiment of the present invention provides a schematic diagram of valve port closing; Figure 4 is a schematic diagram of an air intake of an air intake port of a valve body provided by an embodiment of the present invention; Figure 5 It is a schematic diagram of an adjustable exhaust hole plate provided by an embodiment of the present invention; Figure 6 It is a schematic diagram of an air inlet plate provided by an embodiment of the present invention.

[0015] In the figure: 1. valve body; 2. spring bracket; 3. float; 4. casing; 5. casing cover; 6. diaphragm; 7. piston; 8. air inlet plate; 9. adjustable exhaust plate; 10. exhaust port; 11. spring; 12. lower chamber; 13. upper valve cover; 14. upper chamber; 15. piston guide bracket; 16. air inlet plate guide bracket; 17. hollow pipe diameter; 18. lower base plate; 19. bolt; 20. control chamber. DETAILED DESCRIPTION

[0016] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0017] The structure of the present invention is described in detail below in conjunction with the accompanying drawings.

[0018] like Figures 1 to 6 As shown, an adjustable anti-water hammer buffer air valve provided by an embodiment of the present invention includes a valve body 1 and an upper valve cover 13, the upper valve cover 13 is located at the top of the valve body 1, the bottom of the upper valve cover 13 is fixedly connected to the top of the valve body 1, an upper cavity 14 is opened inside the upper valve cover 13, a spring 11 bracket 2 is fixedly connected to the top of the inner wall of the upper valve cover 13, a spring 11 is fixedly connected to the bottom of the spring 11 bracket 2, an adjustable exhaust orifice plate 9 is fixedly connected to the bottom of the spring 11, an air inlet orifice plate 8 is arranged at the bottom of the adjustable exhaust orifice plate 9, bolts 19 are arranged inside the adjustable exhaust orifice plate 9 and the air inlet orifice plate 8 are connected by bolts 19, the adjustable exhaust orifice plate 9 and the air inlet orifice plate 8 are connected by bolts 19, and the adjustable exhaust orifice plate 9 can be rotated to adjust the exhaust orifice plate 9. To change the relative position, thereby changing the size of the exhaust aperture, it can be adjusted according to needs. An exhaust port 10 is opened inside the air inlet orifice plate 8, and a piston guide bracket 15 is fixedly connected to the bottom of the air inlet orifice plate 8. The piston 7 can move freely up and down in the piston guide bracket 15. A hollow pipe diameter 17 is opened inside the piston 7, and the top of the hollow pipe diameter 17 is connected to the exhaust port 10. A diaphragm 6 is fixedly connected to the bottom of the piston 7, and a casing cover plate 5 is fixedly connected to the bottom of the diaphragm 6. A float 3 is arranged at the bottom of the casing cover plate 5. The top of the float 3 penetrates the casing cover plate 5 and is in sealing contact with the bottom of the piston 7. The diaphragm 6, the piston 7 and the casing cover plate 5 surround a control chamber 20. An exhaust port is opened on the surface of the upper valve cover 13, and a lower chamber 12 is opened inside the valve body 1.

[0019] By adjusting the balance between the gravity of the air inlet plate 8 and the elastic force of the spring 11, the switching pressure of the large and small exhaust ports 10 can be adjusted. When the switching pressure is not zero and the pipeline airbag pressure is higher than the switching pressure, the air inlet plate 8 is lifted up under the pressure difference to close the large exhaust port 10 (air inlet). When the switching pressure is set to zero, after the air valve completes the intake, the air inlet plate 8 will immediately reset and close the large exhaust port 10 (air inlet) under the tension of the spring 11, allowing only buffer exhaust. The adjustable exhaust plate 9 is connected to the air inlet plate 8 by bolts 19, and can be rotated to change the relative position, thereby changing the exhaust port. The size of the air pore diameter can be adjusted according to demand. The buffer exhaust port 10 can be opened for exhaust at any high pressure. The control chamber 20 surrounded by the diaphragm 6, the piston 7 and the casing cover plate 5, when gas passes through the lower chamber 12 of the air valve in the pipeline, the float 3 falls, and the hollow pipe diameter 17 connects the control chamber 20 to the atmosphere, so that the control chamber 20 becomes atmospheric pressure, while the outside of the control chamber 20 is the high-pressure gas in the pipeline (greater than the gas pressure in the control chamber 20). Under the action of the internal and external pressure difference of the control chamber 20, the diaphragm 6 is compressed and the piston 7 is driven downward, and the buffer exhaust port 10 is opened for buffer exhaust.

[0020] A piston guide bracket 15 is sleeved on the surface of the piston 7, and the top of the piston guide bracket 15 is fixedly connected to the bottom of the air inlet plate 8. A movable space for the movement of the piston 7 is opened inside the piston guide bracket 15. By setting the piston guide bracket 15, the piston 7 can be limited. After the exhaust is completed, the float 3 and the piston 7 move upward together to ensure that the exhaust hole has a good sealing effect.

[0021] The bottom of the casing cover plate 5 is fixedly connected with the casing 4, and the surrounding areas of the casing 4 are grille-type water inlets. The float 3 is located inside the casing 4. The bottom of the casing 4 is fixedly connected with a lower bottom plate 18, which is a grille hole plate. The surface of the lower bottom plate 18 is fixedly connected to the bottom of the inner wall of the valve body 1. The casing 4 design fixedly connected to the bottom of the casing cover plate 5 and the grille-type water inlet adopted around the casing 4 can effectively control the speed and direction of water entering the casing 4, and avoid the instability of the float 3 caused by excessive water flow. The float 3 is located inside the casing 4 and can float up and down with the change of water level, thereby controlling the opening and closing of the exhaust port 10. The lower bottom plate 18 fixedly connected to the bottom of the casing 4 is a grille hole plate design, which can not only enhance the stability of the structure, but also prevent debris from entering the casing 4, and ensure the normal operation of the float 3. The fixed connection between the surface of the lower bottom plate 18 and the bottom of the inner wall of the valve body 1 further ensures the stability and sealing of the entire structure, and improves the service life and safety of the valve.

[0022] There are multiple exhaust holes evenly distributed on the surface of the upper valve cover 13. The upper cavity 14 is connected to the outside through the exhaust holes. The exhaust holes facilitate the communication between the upper cavity 14 and the outside air.

[0023] The surface of the air inlet plate 8 is sleeved with an air inlet plate guide bracket 16 for limiting the position of the air inlet plate 8. The surface of the air inlet plate guide bracket 16 is fixedly connected to the inner wall of the valve body 1. By setting the air inlet plate guide bracket 16, the air inlet plate 8 can be limited, and the sealing effect of the air inlet plate 8 is ensured to be good after the air intake is completed.

[0024] Working principle of the present invention: Closed state: When in use, the valve body 1 is connected to the water pipeline. When the water pipeline is operating normally, water flows into the lower chamber 12, immersing the outside of the float 3 and the piston 7. When the pipeline is airless, the lower chamber 12 is filled with water, and the float 3 is lifted up by the buoyancy, sealing the lower end of the hollow pipe 17, and the valve is closed; Exhaust state: when there is an air bag in the pipeline, the float 3 drops due to the reduction of water volume and buoyancy in the lower chamber 12 of the valve body 1, the contact sealing surface between the float 3 and the piston 7 opens, the lower port of the hollow pipe diameter 17 opens, the space under the diaphragm 6 is connected to the atmosphere and maintained at atmospheric pressure, the pressures on the upper and lower surfaces of the piston 7 are unequal, so that the piston 7 falls and separates from the air inlet orifice plate 8, the buffer exhaust port 10 opens, the gas in the pipeline enters the upper chamber 14 through the buffer exhaust port 10, and then is discharged into the atmosphere through the peripheral exhaust holes, the air inlet orifice plate 8 cannot fall because it is lifted up by the high-pressure gas in the air valve, so the air inlet port is closed; Intake state: When the pipeline pressure is lower than the atmospheric pressure, the linkage components (including the air intake orifice plate 8, the adjustable exhaust orifice plate 9, the spring 11), the float 3, and the piston 7 move downward, the air intake orifice plate 8 is separated from the upper valve cover 13, the air intake port is opened, and the outside air is added to the pipeline to avoid the negative pressure caused by the water column being broken.

[0025] To sum up: the adjustable anti-water hammer buffer air valve is used in conjunction with the valve body 1, spring 11 bracket 2, float 3, casing 4, casing cover 5, diaphragm 6, piston 7, air inlet orifice plate 8, adjustable exhaust orifice plate 9, buffer exhaust port 10, spring 11, lower chamber 12, upper valve cover 13, upper chamber 14, piston guide bracket 15, air inlet orifice plate guide bracket 16, hollow pipe diameter 17, lower bottom plate 18 and bolt 19. The valve body 1 is connected to the water pipeline. When the water pipeline operates normally, the valve body 1 is connected to the water pipeline. When the water pipeline operates normally, water flows into the lower chamber 12, immersing the outside of the float 3 and the piston 7. When there is no air in the pipeline, the lower chamber 12 is filled with water, and the float 3 will be lifted up by the buoyancy to seal the lower end of the hollow pipe diameter 17, and the valve is closed. When there is negative pressure in the pipeline, when the pipeline pressure is lower than the atmospheric pressure, the linkage components (including the air inlet plate 8, the adjustable exhaust plate 9, the spring 11), the float 3, and the piston 7 move downward, the air inlet plate 8 is separated from the upper valve cover 13, the air inlet is opened, and the outside air is added to the pipeline to avoid the negative pressure caused by the water column breaking. As long as there is gas in the pipeline, no matter how high the gas pressure is, it can be discharged in time, and the buffer exhaust port 10 can be set to a size as needed to achieve high-pressure buffer exhaust. This air valve can achieve high-speed air intake and timely pressure replenishment. The exhaust effect is good, and continuous exhaust between gas and water can be achieved. The switching pressure of the large exhaust port 10 (same as the air inlet) and the small exhaust port 10 (buffer exhaust port 10) can be set as needed. The low-pressure gas in the pipeline water filling stage can be discharged at high speed through the large exhaust port 10, and the high-pressure gas generated in the pipeline operation stage can be discharged at low speed through the small exhaust port 10, so that the air bag plays a buffering role in the process of water column bridging, avoiding the problem of pipeline pressure oscillation caused by excessive exhaust of high-pressure gas.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable anti-water hammer buffer air valve, characterized in that: The valve body (1) comprises a valve body (1) and an upper valve cover (13), wherein the upper valve cover (13) is located at the top of the valve body (1), the bottom of the upper valve cover (13) is fixedly connected to the top of the valve body (1), an upper chamber (14) is provided inside the upper valve cover (13), an exhaust port (10) is provided inside the air inlet plate (8), a piston guide bracket (15) is fixedly connected to the bottom of the air inlet plate (8), the piston (7) can freely move up and down in the piston guide bracket (15), a hollow pipe diameter (17) is provided inside the piston (7), and the hollow pipe diameter The top of the piston (17) is connected to the exhaust port (10), the bottom of the piston (7) is fixedly connected to a diaphragm (6), the bottom of the diaphragm (6) is fixedly connected to a casing cover plate (5), the bottom of the casing cover plate (5) is provided with a float (3), the top of the float (3) passes through the casing cover plate (5) and is in sealing contact with the bottom of the piston (7), the diaphragm (6), the piston (7) and the casing cover plate (5) form a control chamber (20), the surface of the upper valve cover (13) is provided with an exhaust port, and the interior of the valve body (1) is provided with a lower chamber (12).

2. The adjustable anti-water hammer buffer air valve according to claim 1, characterized in that: The top of the inner wall of the upper valve cover (13) is fixedly connected to a spring bracket (2), the bottom of the spring bracket (2) is fixedly connected to a spring (11), the bottom of the spring (11) is fixedly connected to an adjustable exhaust hole plate (9), the bottom of the adjustable exhaust hole plate (9) is provided with an air intake hole plate (8), bolts (19) are provided inside the adjustable exhaust hole plate (9) and the air intake hole plate (8), and the adjustable exhaust hole plate (9) and the air intake hole plate (8) are connected via the bolts (19).

3. The adjustable anti-water hammer buffer air valve according to claim 1, characterized in that: The top of the floating ball (3) penetrates the casing cover plate (5) and is in sealing contact with the bottom of the piston (7); the diaphragm (6), the piston (7) and the casing cover plate (5) form a control chamber (20).

4. The adjustable anti-water hammer buffer air valve according to claim 1, characterized in that: A piston guide bracket (15) is fixedly connected to the bottom of the air inlet plate (8), and the piston (7) can freely move up and down in the piston guide bracket (15). A hollow tube (17) is provided inside the piston (7), and the top of the hollow tube (17) is connected to the exhaust port (10).

5. The adjustable anti-water hammer buffer air valve according to claim 1, characterized in that: The bottom of the casing cover plate (5) is fixedly connected to the casing (4), the casing (4) is surrounded by grille-type water inlets, the float (3) is located inside the casing (4), the bottom of the casing (4) is fixedly connected to the lower bottom plate (18), the lower bottom plate (18) is a grille perforated plate, and the surface of the lower bottom plate (18) is fixedly connected to the bottom of the inner wall of the valve body (1).

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