Vacuum exhaust valve
By designing a vacuum exhaust valve that utilizes a float and tension spring to drive a lever mechanism, the mechanical exhaust of negative pressure air is achieved, solving the problem of air accumulation and blockage in siphon pipes, reducing operation and maintenance costs and energy consumption, and improving system reliability.
Patent Information
- Application Number
- CN202511405526.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-29
- Publication Date
- 2025-12-02
AI Technical Summary
Air accumulation at the high point of the siphon pipe causes blockage. Existing technology requires the installation of a vacuum pump, which is energy-intensive and has power supply issues, and cannot effectively exhaust air under negative pressure.
Design a vacuum exhaust valve that uses a float and a tension spring to drive a lever mechanism, and uses a piston mechanism to convert negative pressure air into positive pressure before exhausting it. The negative pressure exhaust is achieved using a purely mechanical structure.
It reduces the operation and maintenance costs and management costs of the siphon system, is energy-saving and highly reliable, solves the water flow problem in the siphon pipe, and is easy to install.
Smart Images
Figure CN121048024A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of valves, and in particular relates to a vacuum exhaust valve. Background Technology
[0002] In some siphon pumping station systems, especially flood control pumping stations along rivers, the pumps draw water over the river embankment before it flows into the river. The river water level is slightly higher than the pumping station's water level, necessitating pressurization. However, the river embankment is significantly higher than the river water level. Therefore, when the pipeline crosses the embankment, high-lift pumps are often used initially for water flow. Once the pipeline is full, low-lift pumps are switched on. At this point, the head of the low-lift pump only needs to be greater than the elevation from the river surface to the pumping station; the head from the embankment to the pumping station is not required. This saves a significant amount of energy. This is a common siphon pumping station system, characterized by a negative pressure state at the highest point of the pipeline.
[0003] However, as is well known, air accumulates at high points in pipelines. This air may originate from air drawn in by pumping stations or air released from the water within the pipeline. This air accumulates at high points (such as river embankments), and as the accumulated air increases, it can clog the pipeline, causing it to lose its water-carrying capacity. Conventional positive-pressure pipelines can have air vents installed at high points to expel this air. However, siphon pipelines operate under negative pressure at high points. Installing an air vent would only draw outside air into the pipeline, disrupting the siphon and cutting off water flow. To solve this problem, current siphon pipelines typically require vacuum pumps installed at high points to extract the accumulated air. However, vacuum pumps are energy-intensive, costly, and have power supply issues.
[0004] This technical solution achieves exhaust under negative pressure through a purely mechanical structure. Summary of the Invention
[0005] In view of this, the present invention aims to provide a vacuum exhaust valve to solve at least one of the problems existing in the prior art.
[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows: A vacuum exhaust valve includes a valve body, a float, a lever, a tension spring, a piston mechanism, and an exhaust valve core. The valve body has two interconnected first and second hollow cavities. The first hollow cavity is located to the right of the second hollow cavity. A float is installed inside the first hollow cavity. The float is connected to one end of the lever and is also connected to one side of the second hollow cavity via a tension spring. The other end of the lever is installed to the bottom of the piston mechanism, which is located inside the second hollow cavity. An exhaust valve core is installed at the top of the second hollow cavity.
[0007] Furthermore, the piston mechanism includes a valve shaft and a piston, with the bottom end of the valve shaft connected to the other end of the lever and the piston mounted on the top of the valve shaft.
[0008] Furthermore, the second hollow cavity has an exhaust port at its top, and an exhaust valve core is installed inside the exhaust port.
[0009] Furthermore, a first air guide hole and a second air guide hole are provided on the upper right side of the second hollow cavity.
[0010] Furthermore, the bottom of the first hollow cavity is provided with a water inlet pipe that is connected to the siphon pipe.
[0011] Furthermore, a clearance hole is provided in the middle of the right side of the second hollow cavity, and the other end of the lever is installed to the bottom end of the valve shaft through the clearance hole.
[0012] Furthermore, the vacuum exhaust valve generates a lever driving force through the combined force of the buoyancy of the float ball and the tension of the upper and lower inflection points of the tension spring. This force drives the piston mechanism to move, compressing the negative pressure air into positive pressure air. Then, the piston mechanism touches the exhaust valve core, discharging the compressed positive pressure gas, which is equivalent to discharging the negative pressure gas.
[0013] Compared with the prior art, the vacuum exhaust valve of the present invention has the following advantages: The vacuum exhaust valve described in this invention can be used for negative pressure exhaust; it can replace a vacuum pump, significantly reducing the operation and maintenance costs and management costs of siphon systems, and is energy-saving; it can solve the water flow problem in siphon pipes, is easy to install, has a purely mechanical structure, and is highly reliable. Attached Figure Description
[0014] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a cross-sectional schematic diagram of the overall structure in the gas collection state as described in an embodiment of the present invention; Figure 2 This is a cross-sectional view of the overall structure under exhaust conditions as described in an embodiment of the present invention.
[0015] Explanation of reference numerals in the attached figures: 1. Valve body; 11. First hollow cavity; 12. Second hollow cavity; 13. First air guide hole; 14. Second air guide hole; 15. Relief hole; 16. Water inlet pipe; 17. Exhaust hole; 2. Float ball; 3. Lever; 4. Tension spring; 5. Valve shaft; 6. Piston; 7. Exhaust valve core. Detailed Implementation
[0016] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.
[0017] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.
[0018] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0019] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0020] like Figures 1 to 2As shown, a vacuum exhaust valve comprises a valve body 1, a float 2, a lever 3, a tension spring 4, a valve shaft 5, a piston 6, and an exhaust valve core 7. The valve body 1 has two interconnected first hollow cavities 11 and second hollow cavities 12. The first hollow cavity 11 is located to the right of the second hollow cavity 12. The float 2 is installed inside the first hollow cavity 11. The float 2 is connected to one end of the lever 3, and the other end of the lever 3 is installed to the bottom end of the valve shaft 5. The float 2 is also connected to one side of the second hollow cavity 12 via the tension spring 4. The valve shaft 5 is located in the second... Inside the hollow cavity 12, a piston 6 is installed on the top of the valve shaft 5. An exhaust port 71 is opened on the top of the second hollow cavity 12, and an exhaust valve core 7 is installed inside the exhaust port 71. A first air guide hole 13 and a second air guide hole 14 are opened on the upper right side of the second hollow cavity 12, used for air guidance. A water inlet pipe 16 connected to the siphon pipe is provided at the bottom of the first hollow cavity 11. A clearance hole 15 is opened in the middle of the right side of the second hollow cavity 12, and the other end of the lever 3 is installed to the bottom end of the valve shaft 5 through the clearance hole 15. In this embodiment, the valve generates a driving force for the lever 3 through the combined force of the buoyancy of the float ball 2 and the tension of the upper and lower inflection points of the tension spring 4. This force drives the piston mechanism (valve shaft 5 and piston 6) to move, compressing negative pressure air into positive pressure air. Then, the piston mechanism touches the exhaust valve core 7, discharging the compressed positive pressure gas, which is equivalent to discharging negative pressure gas.
[0021] Advantages of a vacuum exhaust valve: It can be used for negative pressure exhaust; it can replace a vacuum pump, significantly reducing the operation and maintenance costs and management costs of siphon systems, and is energy-saving; it can solve the water flow problem in siphon pipes, is easy to install, has a purely mechanical structure, and is highly reliable.
[0022] The working principle of a vacuum exhaust valve: In the initial state, the siphon pipe is full of water, and the water enters the valve body 1 through the inlet pipe 16. The float ball 2 floats up under the action of the water. Under the action of the buoyancy of the water, the lever 3 pulls down the valve shaft 5, and the piston 6 is in the lower position. At this time, the tension spring 4 flips up, and the tension of the tension spring 4 is added to the buoyancy. When air begins to accumulate in the pipe, because air is lighter than water, it enters the water inlet pipe 16 at the top of the pipe and then enters the valve body 1. As more and more air accumulates inside valve body 1, the buoyancy of float 2 decreases while its weight increases. When the weight of float 2 exceeds the sum of its buoyancy and the upward pulling force of tension spring 4, float 2 will fall. During this fall, the upward pulling force of tension spring 4 decreases as its direction approaches the hinge point. When the tension spring 4 coincides with the hinge point, its force on float 2 disappears. When tension spring 4 passes the hinge point and flips downward, the torque generated by its force becomes added to the weight of float 2. Therefore, under the combined action of the weight of float 2 and the pulling force of tension spring 4, lever 3 generates a significant upward thrust. The piston pushes the valve shaft 5 and piston 6 upward. When piston 6 moves upward, negative pressure air accumulates in the upper cavity (second hollow cavity 12). For example, if the current negative pressure value is -4 meters, when piston 6 moves upward to 40% of the volume of the upper cavity (second hollow cavity 12), the negative pressure of the exhaust valve core 7 is equal to the external atmospheric pressure. When piston 6 continues to move upward to more than 40% of the area of the upper cavity (second hollow cavity 12), the air pressure in the upper cavity will be greater than the external atmospheric pressure. At this time, the exhaust valve core 7 will open to exhaust air. When piston 6 continues to move upward to the valve core guide rod of the exhaust valve core 7, piston 6 will touch the valve core guide rod of the exhaust valve core 7, and the air in the upper cavity will be completely discharged through the exhaust hole 17. When the air in the upper chamber is exhausted, the air in the valve body 1 decreases, and the buoyancy of the float 2 is greater than the gravity, causing the float 2 to float up. This is the same as the three mechanical principles, but with opposite forces. The valve shaft 5 and piston 6 are pulled back down by the buoyancy of the float 2 and the pulling force of the tension spring 4. When the piston 6 leaves the valve core guide rod of the exhaust valve core 7, the upper chamber quickly becomes negatively pressurized due to the suction effect of the piston 6. The exhaust valve core 7 closes under the action of external atmospheric pressure. As the piston 6 continues to descend, the negative pressure in the upper chamber will draw air or water from the float 2 chamber, and the valve enters the next working cycle, realizing the automatic discharge of negative pressure air.
[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A vacuum exhaust valve, characterized in that: The device includes a valve body (1), a float (2), a lever (3), a tension spring (4), a piston mechanism, and an exhaust valve core (7). The valve body (1) has two interconnected first hollow cavities (11) and second hollow cavities (12). The first hollow cavity (11) is located to the right of the second hollow cavity (12). The float (2) is installed inside the first hollow cavity (11). The float (2) is connected to one end of the lever (3), and the float (2) is also connected to one side of the second hollow cavity (12) through the tension spring (4). The other end of the lever (3) is installed to the bottom of the piston mechanism, which is located inside the second hollow cavity (12). The exhaust valve core (7) is installed on the top of the second hollow cavity (12).
2. A vacuum exhaust valve according to claim 1, characterized in that: The piston mechanism includes a valve shaft (5) and a piston (6). The bottom end of the valve shaft (5) is connected to the other end of the lever (3), and the piston (6) is mounted on the top of the valve shaft (5).
3. A vacuum exhaust valve according to claim 1, characterized in that: The second hollow cavity (12) has an exhaust hole (17) at the top, and an exhaust valve core (7) is installed inside the exhaust hole (17).
4. A vacuum exhaust valve according to claim 1, characterized in that: The second hollow cavity (12) has a first air guide hole (13) and a second air guide hole (14) on the upper right side.
5. A vacuum exhaust valve according to claim 1, characterized in that: The bottom of the first hollow cavity (11) is provided with a water inlet pipe (16) that is connected to the siphon pipe.
6. A vacuum exhaust valve according to claim 1, characterized in that: The second hollow cavity (12) has a relief hole (15) in the middle of the right side, and the other end of the lever (3) is installed to the bottom end of the valve shaft (5) through the relief hole (15).
7. A vacuum exhaust valve according to claim 1, characterized in that: The vacuum exhaust valve generates a combined force through the buoyancy of the float (2) and the tension of the upper and lower inflection points of the tension spring (4), forming the driving force of the lever (3), which drives the piston mechanism to move, compressing the negative pressure air into positive pressure air, and then the piston mechanism touches the exhaust valve core (7) to discharge the compressed positive pressure gas, which is equivalent to discharging the negative pressure gas.