Hinge type pneumatic pilot valve and sewage discharge control system

Abstract

The present application relates to a hinged pressure pilot valve and a sewage blowdown control system, comprising a valve body assembly and a control mechanism; the valve body assembly is formed with a containing cavity, which is provided with a negative pressure through hole, a mounting through hole, a first pressure through hole and a working through hole; the control mechanism comprises a first piston assembly, a second piston assembly and a counter-pressure assembly; the first piston assembly comprises a first piston body and a blocking component, the first piston body is in sliding seal with the cavity wall of the containing cavity, and the first piston body is provided with a second pressure through hole; the blocking component is arranged on the first piston body; the second piston assembly comprises a second piston body and a counterweight component, the second piston body is in sliding seal with the cavity wall of the containing cavity; the counterweight component is connected with the second piston body; the counter-pressure assembly is arranged between and connected with the first piston assembly and the second piston assembly. The present application realizes the opening and closing of the valve by using a pure mechanical structure and cooperating with pressure as a control signal, can be applied to harsh working conditions, has accurate control and stable working performance.

Description

Technical Field

[0001] This invention relates to the field of control valve technology, and more particularly to a hinged pneumatic pilot valve and a sewage discharge control system. Background Technology

[0002] With the advancement of technology, people's demand for wastewater treatment is increasing. Wastewater treatment involves purifying wastewater through physical, chemical, and biological methods. After purification, the wastewater can achieve a certain level of cleanliness, meeting the requirements for water resource recycling.

[0003] Wastewater discharge control is a crucial aspect of wastewater treatment. A typical wastewater discharge control system includes a wastewater tank, a pilot valve, a discharge pressure valve, and a negative pressure device. The discharge pressure valve's inlet is connected to the wastewater tank, and its negative pressure outlet is connected to the negative pressure device. The pilot valve is connected to both the discharge pressure valve's valve orifice and the negative pressure device. As the control component of the discharge pressure valve, the pilot valve isolates the discharge pressure valve's valve orifice from the negative pressure device when it is not in operation, allowing the valve orifice to communicate with the atmosphere. In this state, the discharge pressure valve is closed under atmospheric pressure. When the pilot valve is in operation, the negative pressure device connects to the discharge pressure valve's valve orifice. Under the negative pressure of the device, the discharge pressure valve opens, and the negative pressure outlet connects directly to the wastewater inlet. At this point, under the negative pressure of the device, wastewater from the wastewater tank enters the discharge pressure valve through the wastewater inlet and is discharged into the wastewater collection tank.

[0004] In existing technologies, pilot valves are divided into two types: electromagnetically driven and manually controlled. Electromagnetic pilot valves control the opening and closing of the pilot orifice by controlling the energization and de-energization of a solenoid coil, outputting different air pressure signals to control the valve. However, electromagnetic pilot valves are highly dependent on electrical circuits, require electric drive, and are difficult to adapt to harsh working conditions. Manual pilot valves do not require control circuits and can operate in harsh conditions, but they rely on manual operation, cannot achieve automated control, and are difficult to control with precision.

[0005] In conclusion, there is an urgent need for a pilot valve that can achieve precise automated control while adapting to harsh working conditions. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the difficulty of existing pilot valves in achieving precise automation under harsh working conditions. The present invention provides a hinged pneumatic pilot valve and a sewage discharge control system. By setting valve body components and control mechanisms, the valve can be automatically opened and closed with a purely mechanical structure and pneumatic pressure as the control signal. It can be used in harsh working conditions without the control circuit, with precise control and stable working performance.

[0007] This invention provides a hinged pneumatic pilot valve, comprising a valve body assembly, the valve body assembly being hollow along its own axis of symmetry to form a receiving cavity, a negative pressure through hole being formed at one end of the receiving cavity along its own axis of symmetry for communicating with external negative pressure; a mounting through hole being formed at the other end of the receiving cavity along its own axis of symmetry; a first pneumatic through hole and a working through hole being formed on the cavity wall of the receiving cavity, the first pneumatic through hole being for communicating with external atmospheric pressure, and the working through hole being for communicating with the outside; a control mechanism, the control mechanism comprising a first piston assembly, a second piston assembly, and a counter-pressure assembly; the first piston assembly being disposed in the receiving cavity near the end of the negative pressure through hole, the first piston assembly comprising a first piston body and a sealing component, the first piston body being slidably sealed to the cavity wall of the receiving cavity, and a second pneumatic through hole being formed on the first piston body; the sealing component being disposed on the first piston body; the second piston assembly being disposed in the receiving cavity near the end of the mounting through hole, the second piston assembly comprising a second piston body and a counterweight component, the second piston body being slidably sealed to the cavity wall of the receiving cavity; The counterweight component is connected to the second piston body; the counter-pressure assembly is disposed between the first piston assembly and the second piston assembly, and is connected to both the first piston assembly and the second piston assembly. The counter-pressure assembly is used to move the first piston assembly relatively closer to or relatively farther away from the second piston assembly; wherein, the control mechanism includes a first state and a second state; when the control mechanism is in the first state, the counterweight component moves the second piston body relatively closer to the mounting through hole, causing the counter-pressure assembly to move the first piston assembly relatively farther away from the second piston assembly, and the sealing component forms a blockage of the negative pressure through hole, and the first air pressure through hole, the second air pressure through hole, and the working through hole are interconnected; when the control mechanism is in the second state, external air pressure moves the second piston assembly relatively farther away from the mounting through hole, causing the counter-pressure assembly to move the first piston assembly relatively closer to the second piston assembly, and the first piston assembly forms a blockage of the first air pressure through hole, the sealing component is away from the negative pressure through hole, and the negative pressure through hole is interconnected with the working through hole.

[0008] In one embodiment of the present invention, a liquid level sensing tube is further included. The liquid level sensing tube is disposed on the mounting through hole and is used to contact external liquid. The liquid level sensing tube is provided with a rated liquid level height. When the height of the external liquid in the liquid level sensing tube is lower than the rated liquid level height, the control mechanism enters the first state. When the rated liquid level height is lower than the height of the external liquid in the liquid level sensing tube, the control mechanism enters the second state.

[0009] In one embodiment of the present invention, the pressure-counterassembly includes a fixed rod, one end of which is fixedly connected to the cavity wall of the receiving cavity; a pressure-counterassembly connecting rod, which is rotatably connected to the end of the fixed rod away from the cavity wall of the receiving cavity; a piston rod, one end of which is connected to a second piston assembly, and the other end of which is rotatably connected to a first end of the pressure-counterassembly connecting rod; and a pressure-counterassembly rod, one end of which is rotatably connected to a second end of the pressure-counterassembly connecting rod, and the other end of which is rotatably connected to the first piston assembly.

[0010] In one embodiment of the present invention, the normals of the piston end faces of the first piston body and the second piston body are both parallel to the axial direction of the symmetry axis of the receiving cavity; two of each of the fixing rod, the counter-pressure connecting rod, and the counter-pressure rod are provided; the axial directions of the symmetry axes of the two fixing rods are parallel, and the axial directions of the symmetry axes of the two fixing rods are both perpendicular to the axial direction of the symmetry axis of the receiving cavity; the axial directions of the symmetry axes of the two counter-pressure connecting rods are both perpendicular to the axial direction of the symmetry axis of the fixing rods; a sliding groove is formed on the first end of each of the two counter-pressure connecting rods along its own axial direction of symmetry; the piston rod includes a first rod. The first rod segment has an axis of symmetry parallel to the axis of symmetry of the receiving cavity. One end of the first rod segment is fixedly connected to the second piston assembly, and the other end of the first rod segment is fixedly connected to the middle position of the second rod segment. The axis of symmetry of the second rod segment is perpendicular to the axis of symmetry of the receiving cavity. Both ends of the second rod segment are rotatably connected to the corresponding first ends, and the rotatable connection points of both are movably arranged in the corresponding sliding grooves. The axes of symmetry of the two counter-pressure rods are both perpendicular to the axis of symmetry of the fixed rod.

[0011] In one embodiment of the present invention, the displacement Δd1 of the first piston body and the displacement Δd2 of the second piston body satisfy the following relationship:

[0012]

[0013]

[0014] Where a is the length of the first rod segment, b is the length of the counter-pressure connecting rod, c is the length of the counter-pressure rod, k is the ratio of the distance from the first end to the fixed rod to the distance from the first end to the second rod segment, θ is the angle between the counter-pressure rod and the first piston body; l1 is the length of the second rod segment, and l2 is the distance between the two counter-pressure rods on the first piston assembly.

[0015] In one embodiment of the present invention, a filter element is provided at the liquid inlet end of the liquid level sensing tube.

[0016] In one embodiment of the present invention, the first piston assembly further includes a limiting member disposed on the cavity wall of the receiving cavity, and the limiting member is located on the side of the first air pressure through hole axially away from the negative pressure through hole along the axis of symmetry of the receiving cavity, and the limiting member limits the sliding of the first piston body.

[0017] In one embodiment of the present invention, the second air pressure through hole is disposed on the piston side wall surface of the first piston body; when the control mechanism is in the second state, the limiting component forms a blockage of the second air pressure through hole.

[0018] In one embodiment of the present invention, the first piston assembly further includes an elastic reset component, one end of which is connected to the valve body assembly, and the other end of which is connected to the first piston assembly.

[0019] The present invention also provides a sewage discharge control system, including a sewage tank, a discharge pressure valve, a negative pressure device, a sewage collection tank, and a hinged pneumatic pilot valve as described in any one of the above; the mounting through hole is connected to the sewage tank, the negative pressure through hole is connected to the negative pressure device; the liquid inlet through hole of the discharge pressure valve is connected to the sewage tank, the valve through hole of the discharge pressure valve is connected to the working through hole, the discharge negative pressure through hole of the discharge pressure valve is connected to the negative pressure device, and the sewage collection tank is connected to the discharge negative pressure through hole of the discharge pressure valve.

[0020] The technical solution of the present invention has the following advantages over the prior art:

[0021] The hinged pneumatic pilot valve of this invention, through the setting of valve body components and control mechanisms, achieves automatic opening and closing of the valve with a purely mechanical structure and pneumatic pressure as the control signal, eliminating the need for manual operation. When the control mechanism is in the first state, the counterweight component moves the second piston body relatively closer to the mounting through hole, causing the counter-pressure component to move the first piston assembly relatively away from the second piston assembly. The sealing component blocks the negative pressure through hole, and the first pneumatic through hole, the second pneumatic through hole, and the working through hole are interconnected. When the control mechanism is in the second state, external pneumatic pressure moves the second piston assembly relatively away from the mounting through hole. The second piston body moves, causing the counter-pressure component to move the first piston assembly relatively away from the second piston assembly. The sealing component no longer blocks the negative pressure through hole, and the negative pressure through hole and the working through hole are interconnected. It can operate independently of the control circuit in harsh conditions such as sewage tanks. The entire valve offers precise control and stable performance. Attached Figure Description

[0022] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0023] Figure 1 This is a cross-sectional view of a hinged pneumatic pilot valve in its first state according to a preferred embodiment of the present invention.

[0024] Figure 2 This is a cross-sectional view of a hinged pneumatic pilot valve in its second state according to a preferred embodiment of the present invention.

[0025] Figure 3 This is a cross-sectional view of the liquid level sensing tube in a preferred embodiment of the present invention;

[0026] Figure 4 This is a first-view cross-sectional structural diagram of the pressure assembly in a preferred embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram showing the dimensional relationship of the pressure-relief assembly in a preferred embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the second angle cross-sectional structure of the pressure assembly in a preferred embodiment of the present invention;

[0029] Figure 7 This is a cross-sectional view of another hinged pneumatic pilot valve in a preferred embodiment of the present invention when it is in the first state.

[0030] Figure 8 This is a cross-sectional view of another hinged pneumatic pilot valve in a preferred embodiment of the present invention when switching between the first and second states.

[0031] Figure 9 This is a cross-sectional view of another hinged pneumatic pilot valve in a preferred embodiment of the present invention when it is in the second state.

[0032] Figure 10 This is a schematic diagram of the sewage discharge control system in a preferred embodiment of the present invention.

[0033] Explanation of reference numerals in the accompanying drawings: 10. Valve body assembly; 11. Receiving cavity; 111. Negative pressure through hole; 112. Mounting through hole; 113. Working through hole; 114. First air pressure through hole; 12. First valve body; 13. Second valve body; 14. First sealing component; 15. Second sealing component; 21. First piston assembly; 211. First piston body; 2111. Second air pressure through hole; 212. Blocking component; 213. Limiting component; 214. Elastic reset component; 22. Second piston assembly; 221. Second piston body; 222. Counterweight component; 231. Piston end face; 232. Piston side wall; 24. Pressure countermeasure component; 241. Fixed rod; 242. Counter-pressure connecting rod; 2421. First end; 2422. Second end; 2423. Slide groove; 243. Piston rod; 2431. First rod segment; 2432. Second rod segment; 2433. Rotary connection point; 244. Counter-pressure rod; 25. Third sealing component; 26. Fourth sealing component; 30. Liquid level sensing tube; 311. First rated liquid level height; 312. Second rated liquid level height; 32. Filter component; 40. Sewage tank; 50. Sewage discharge pressure valve; 51. Liquid inlet through hole; 52. Valve through hole; 53. Sewage discharge negative pressure through hole; 60. Negative pressure device; 70. Pipe body; 80. Sewage collection tank. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0035] Reference Figure 1 and Figure 2 As shown, the present invention discloses a hinged pneumatic pilot valve, including a valve body assembly 10 and a control mechanism.

[0036] The valve body assembly 10 serves as the housing of the entire valve, and its specific shape, size, and material can be customized according to actual needs. The valve body assembly 10 has a hollow cavity 11 formed along its own axis of symmetry to accommodate various components. The shape and size of the cavity 11 can be selected according to actual needs. Preferably, the cavity 11 is a cylindrical structure. A negative pressure through-hole 111 is provided at one end of the cavity 11 along its own axis of symmetry. The negative pressure through-hole 111 is used to communicate with an external negative pressure source, such as the negative pressure generated by the negative pressure device 60, which can be selected according to actual needs. The specific orientation of the axis of symmetry of the cavity 11 can be selected according to actual needs; preferably, the axis of symmetry of the cavity 11 is vertically oriented. A mounting through-hole 112 is provided at the other end of the cavity 11 along its own axis of symmetry. The mounting through-hole 112 is used to connect with external components, such as directly communicating with the sewage tank 40 through the mounting through-hole 112, or connecting to the sewage tank 40 through other components, such as the level sensing tube 30. The cavity wall of the receiving cavity 11 is provided with a first air pressure through hole 114 and a working through hole 113. The first air pressure through hole 114 is used to communicate with the external atmospheric pressure; the working through hole 113 communicates with the outside, preferably through the working through hole 113 to communicate with the valve through hole 52 of the drain pressure valve 50. Preferably, a first sealing component 14 is provided at the negative pressure through hole 111 to ensure sealing. Preferably, refer to Figure 7 As shown, the valve body assembly 10 includes a first valve body 12 and a second valve body 13, which are combined to form a receiving cavity 11 to facilitate the assembly of internal components. Preferably, both valve bodies are made of 304 stainless steel. Preferably, the two valve bodies are connected by a flange end face, and a second sealing component 15 is provided at the connection to ensure a seal. Preferably, each sealing component is made of rubber. Preferably, the first sealing component 14 is a sealing ring with a minimum orifice diameter of 5 mm.

[0037] The control mechanism includes a first piston assembly 21, a second piston assembly 22, and a counter-pressure assembly 24. The first piston assembly 21 is mainly used to block the negative pressure through-hole 111, and works with the second piston assembly 22 and the counter-pressure assembly 24 to block the first air pressure through-hole 114 and to connect the negative pressure through-hole 111 with the working through-hole 113. Specifically, the first piston assembly 21 is disposed in the receiving cavity 11 near the negative pressure through-hole 111. The first piston assembly 21 includes a first piston body 211 and a blocking component 212. The first piston body 211 slides and seals against the cavity wall of the receiving cavity 11. Sliding sealing is a prior art technology, and the method of achieving sliding sealing can be selected according to actual needs. Preferably, sliding sealing is achieved by providing a third sealing component 25. A second air pressure through-hole 2111 is provided on the first piston body 211. The second air pressure through-hole 2111 is used to communicate with the first air pressure through-hole 114 to ensure that, in actual use of the hinged air pressure pilot valve, the external atmospheric pressure can be connected to the working through-hole 113 through the first air pressure through-hole 114 and the second air pressure through-hole 2111 in sequence. The setting position of the second air pressure through-hole 2111 can be selected according to actual needs, such as passing through the two piston end faces 231 of the first piston body 211, or being set on the side wall of the first piston body 211, as long as it can achieve the connection between the working through-hole 113 and the external atmospheric pressure when the sealing component 212 blocks the negative pressure through-hole 111. Correspondingly, the working through hole 113 can also be positioned selectively. For example, it can be located on the side wall of the receiving cavity 11 near the end wall, or on the side wall of the receiving cavity 11 between the first piston body 211 and the second piston body 221 after the first piston body 211 blocks the first air pressure through hole 114. The sealing component 212 is disposed on the first piston body 211. The sealing component 212 is existing technology, and different sealing components 212 can be selected according to actual needs. Preferably, a spherical plug is selected. The second piston assembly 22 is disposed in the receiving cavity 11 near the mounting through hole 112. The second piston assembly 22 includes a second piston body 221 and a counterweight component 222. The second piston body 221 slides and seals against the cavity wall of the receiving cavity 11. The second piston body 221 is similar to the first piston body 211 and will not be described again. The counterweight component 222 is connected to the second piston body 221. The counterweight component 222 ensures that when the valve is not in operation, it can drive the second piston body 221 to reset, thus enabling communication between the working through-hole 113 and the external atmospheric pressure. Preferably, considering that the counterweight component 222 needs to come into contact with sewage, in order to ensure its service life, avoid the counterweight component 222 affecting the operation of the pressure countermeasure component 24, and achieve force balance between counterweight and pressure regulation, the counterweight component 222 is made of a lightweight, corrosion-resistant material.A counter-pressure assembly 24 is disposed between the first piston assembly 21 and the second piston assembly 22. The counter-pressure assembly 24 is connected to both the first piston assembly 21 and the second piston assembly 22, and is used to move the first piston assembly 21 relatively closer to or relatively farther away from the second piston assembly 22. Preferably, the diameter of the first air pressure through-hole 114 is set to 5 mm, and the diameters of the working through-hole 113 and the negative pressure through-hole 111 are both set to 10 mm.

[0038] The hinged pneumatic pilot valve of this invention uses external air pressure as a control signal to ensure precise control and stable operation of the entire valve. It should be noted that the external air pressure here is not the same as atmospheric pressure. Preferably, the external air pressure is set to the air pressure required to raise or lower the liquid level in the sewage tank 40. The control mechanism includes a first state and a second state.

[0039] When the control mechanism is in the first state, the counterweight component 222, under its own weight, drives the second piston body 221 to move relatively closer to the mounting through hole 112. The movement of the second piston body 221 causes the counter-pressure component 24 to move the first piston assembly 21 relatively away from the second piston assembly 22. The sealing component 212 blocks the negative pressure through hole 111, and the first air pressure through hole 114, the second air pressure through hole 2111, and the working through hole 113 are interconnected. When the control mechanism is in the second state, external air pressure drives the second piston assembly 22 to move relatively away from the mounting through hole 112. The movement of the second piston body 221 causes the counter-pressure component 24 to move the first piston assembly 21 relatively closer to the second piston assembly 22, and the first piston assembly 21 blocks the first air pressure through hole 114. The sealing component 212 moves away from the negative pressure through hole 111, and the negative pressure through hole 111 is connected to the working through hole 113. Specifically, external air pressure from the mounting through hole 112 drives the second piston assembly 22 to move relatively away from the mounting through hole 112. When the sewage tank 40 is sealed and the liquid level inside rises, the gas inside the sewage tank 40 is compressed by the liquid, resulting in increased gas pressure. This causes the second piston assembly 22 to move relatively away from the mounting through hole 112. Conversely, when the liquid level inside the sewage tank 40 drops, the liquid pressure on the gas inside the sewage tank 40 decreases. This decrease in gas pressure causes the counterweight component 222, under its own weight, to move the second piston body 221 relatively closer to the mounting through hole 112.

[0040] The hinged pneumatic pilot valve of this invention, through the valve body assembly 10 and control mechanism, achieves automatic opening and closing of the valve using a purely mechanical structure and pneumatic pressure as the control signal, eliminating the need for manual operation. When the control mechanism is in the first state, the counterweight component 222 drives the second piston body 221 relatively closer to the mounting through hole 112, causing the counter-pressure component 24 to drive the first piston assembly 21 relatively away from the second piston assembly 22. The sealing component 212 blocks the negative pressure through hole 111, and the first pneumatic through hole 114, the second pneumatic through hole 2111, and the working through hole 113 are interconnected. When the control mechanism is in the second state, external pneumatic pressure drives the second piston assembly 22 relatively away from the mounting through hole 112. The second piston body 221 moves, causing the counter-pressure component 24 to drive the first piston assembly 21 relatively away from the second piston assembly 22. The sealing component 212 no longer blocks the negative pressure through hole 111, and the negative pressure through hole 111 connects with the working through hole 113. This allows for operation without a control circuit, even under harsh conditions. The entire valve offers precise control and stable performance.

[0041] Reference Figure 3As shown, in some embodiments of the hinged pneumatic pilot valve of the present invention, a liquid level sensing tube 30 is disposed on the mounting through hole 112 and is used to contact the external liquid. Preferably, the axial direction of the symmetry axis of the liquid level sensing tube 30 is parallel to the axial direction of the symmetry axis of the receiving cavity 11. By setting the liquid level sensing tube 30, on the one hand, direct contact between the valve and the sewage tank 40 can be avoided, extending the service life; on the other hand, compared with directly connecting the sewage tank 40 to the mounting through hole 112, setting the liquid level sensing tube 30 allows the liquid level sensing tube 30 to be inserted into the liquid inside the sewage tank 40, further ensuring operational stability and control accuracy. The liquid level sensing tube 30 is provided with a rated liquid level height; when the height of the external liquid inside the liquid level sensing tube 30 is lower than the rated liquid level height, the control mechanism enters a first state; when the rated liquid level height is lower than the height of the external liquid inside the liquid level sensing tube 30, the control mechanism enters a second state. Preferably, the rated liquid level height includes a first rated liquid level height 311 and a second rated liquid level height 312. Taking a liquid level that first rises and then falls as an example, when the external liquid level reaches the first liquid level height, the control mechanism switches from the first state to the second state. The gas between the external liquid and the second piston assembly 22 exerts a force on the second piston assembly 22, causing the second piston assembly 22 to move relatively away from the mounting through hole 112. The movement of the second piston assembly 22 causes the pressure-relief component 24 to drive the first piston assembly 21 to move relatively closer to the second piston assembly 22. The sealing component 212 separates from the negative pressure through hole 111 and opens the negative pressure through hole 111, allowing external negative pressure to enter the receiving cavity 11 from the negative pressure through hole 111. When the liquid level reaches the second liquid level height, the first piston assembly 21 blocks the first air pressure through hole 114. After the liquid level falls, the second piston assembly 22 loses its air pressure support and resets under the gravity of the counterweight component 222. Preferably, the first rated liquid level height 311 is set at two-thirds of the total length of the liquid level sensing tube 30, starting from the liquid inlet end of the liquid level sensing tube 30. The second rated liquid level height 312 is set at three-quarters of the total length of the liquid level sensing tube 30, starting from the liquid inlet end of the liquid level sensing tube 30. Preferably, the inner diameter of the liquid level sensing tube 30 is set to 50 mm.

[0042] Reference Figure 4 , Figure 6 , Figure 7 and Figure 8As shown, in some embodiments of the hinged pneumatic pilot valve of the present invention, the counter-pressure assembly 24 includes a fixed rod 241, a counter-pressure connecting rod 242, a piston rod 243, and a counter-pressure rod 244. The installation angle, installation position, size, material, etc., of the corresponding rods can be selected according to actual needs. The fixed rod 241 serves as a rotating support rod for the counter-pressure connecting rod 242, with one end fixedly connected to the cavity wall of the receiving cavity 11. The counter-pressure connecting rod 242 is rotatably connected to the end of the fixed rod 241 away from the cavity wall of the receiving cavity 11. One end of the piston rod 243 is connected to the second piston assembly 22, and the other end of the piston rod 243 is rotatably connected to the first end 2421 of the counter-pressure connecting rod 242. One end of the counter-pressure rod 244 is rotatably connected to the second end 2422 of the counter-pressure connecting rod 242, and the other end of the counter-pressure rod 244 is rotatably connected to the first piston assembly 21. Preferably, it is configured as a hinge. The linkage structure serves as the counter-pressure component 24, which is simple in structure and can stably and accurately transmit force between the first piston assembly 21 and the second piston assembly 22.

[0043] Furthermore, refer to Figure 4 , Figure 6 , Figure 7 and Figure 8As shown, in some embodiments of the hinged pneumatic pilot valve of the present invention, the normals of the piston end faces 231 of the first piston body 211 and the second piston body 221 are parallel to the axial direction of the symmetry axis of the receiving cavity 11. Two fixing rods 241, two counter-pressure connecting rods 242, and two counter-pressure rods 244 are provided; the axial directions of the symmetry axes of the two fixing rods 241 are parallel, and both axial directions of the symmetry axes of the two fixing rods 241 are perpendicular to the axial direction of the symmetry axis of the receiving cavity 11; the axial directions of the symmetry axes of the two counter-pressure connecting rods 242 are perpendicular to the axial direction of the symmetry axis of the fixing rods 241; a groove 2423 is provided on the first end 2421 of each of the two counter-pressure connecting rods 242 along its own axial direction of symmetry, and the groove 2423 facilitates improved space utilization. The piston rod 243 includes a first rod segment 2431 and a second rod segment 2432. The axis of symmetry of the first rod segment 2431 is parallel to the axis of symmetry of the receiving cavity 11. One end of the first rod segment 2431 is fixedly connected to the second piston assembly 22, and the other end of the first rod segment 2431 is fixedly connected to the middle position of the second rod segment 2432. The axis of symmetry of the second rod segment 2432 is perpendicular to the axis of symmetry of the receiving cavity 11. Both ends of the second rod segment 2432 are rotatably connected to the corresponding first end 2421, and the rotatable connection points 2433 of both are movably set in the corresponding sliding grooves 2423. The axes of symmetry of the two counter-pressure rods 244 are both perpendicular to the axis of symmetry of the fixed rod 241. Compared with a structure that only has one fixed rod 241, one counter-pressure connecting rod 242, and one counter-pressure rod 244, the two-rod structure can achieve more stable and precise force transmission. In operation, when the control mechanism is in the first state, the first end 2421 of the counterweight connecting rod 242 is biased towards the mounting through hole 112 under the force of the piston rod 243, and the second end 2422 is biased towards the negative pressure through hole 111 under the force of the counterweight rod 244. When the control mechanism switches from the first state to the second state, the counterweight connecting rod 242 rotates under the drive of the piston rod 243, and drives the counterweight rod 244 connected to its second end 2422 to move, thereby causing the first piston assembly 21 to move closer to the second piston assembly 22. During this process, the rotating connection point 2433 moves from one end of the slide groove 2423 to the other end; and when the second piston assembly 22 moves to a certain position, the rotating connection point 2433 moves in the opposite direction again. When the control mechanism is in the second state, the first end 2421 of the counterweight connecting rod 242 is biased towards the negative pressure through hole 111, and the second end 2422 is biased towards the mounting through hole 112.

[0044] Furthermore, refer to Figure 5 As shown, in some embodiments of the hinged pneumatic pilot valve of the present invention, the displacement Δd1 of the first piston body 211 and the displacement Δd2 of the second piston body 221 satisfy the following relationship:

[0045]

[0046]

[0047] Where a is the length of the first rod segment 2431, b is the length of the counter-pressure connecting rod 242, c is the length of the counter-pressure rod 244, k is the ratio of the distance from the first end 2421 to the fixed rod 241 to the distance from the first end 2421 to the second rod segment 2432, θ is the angle between the counter-pressure rod 244 and the first piston body 211; l1 is the length of the second rod segment 2432, and l2 is the distance between the two counter-pressure rods 244 on the first piston assembly 21. Based on the above two formulas, the compression stroke of the counter-pressure assembly 24, the displacement ratio of the corresponding piston assembly, and the specific geometric dimensions of the corresponding components are completely correlated. The motion parameters can be adjusted by changing the structural dimensions to meet actual design requirements.

[0048] Reference Figure 9 As shown, in some embodiments of the hinged pneumatic pilot valve of the present invention, a filter element 32 is provided at the inlet end of the liquid level sensing tube 30. The filter element 32 ensures the valve's service life and prevents external debris from entering the liquid level sensing tube 30. The filter element 32 is existing technology, and different filter elements 32 can be selected according to actual needs. Preferably, the filter element 32 is a filter screen; more preferably, a 304 stainless steel vibrating screen is selected.

[0049] Reference Figure 7 and Figure 8 As shown, in some embodiments of the hinged pneumatic pilot valve of the present invention, the first piston assembly 21 further includes a limiting component 213, which is disposed on the cavity wall of the receiving cavity 11. Preferably, the limiting component 213 is integrally formed with the first valve body 12. The limiting component 213 is located on the side of the first pneumatic through hole 114 axially away from the negative pressure through hole 111 along the axis of symmetry of the receiving cavity 11, so as to avoid it from obstructing the first piston assembly 21 from closing the first pneumatic through hole 114. The limiting component 213 limits the sliding of the first piston body 211. By setting the limiting component 213, over-displacement of the first piston body 211 can be avoided; at the same time, when the control mechanism is in the second state, it provides a certain supporting force for the first piston body 211 to ensure the stability of the state.

[0050] Furthermore, refer to Figure 9As shown, in some embodiments of the hinged pneumatic pilot valve of the present invention, a second pneumatic through-hole 2111 is disposed on the piston side wall 232 of the first piston body 211; when the control mechanism is in the second state, the limiting component 213 blocks the second pneumatic through-hole 2111. By blocking the second pneumatic through-hole 2111, the valve's internal sealing is further ensured. Preferably, a fourth sealing component 26 is disposed on the limiting component 213 to form a blockage. Preferably, a stepped structure is disposed on the piston side wall 232 of the first piston body 211 to adapt to the limiting component 213, thereby improving space utilization and increasing structural stability.

[0051] Reference Figure 9 As shown, in some embodiments of the hinged pneumatic pilot valve of the present invention, the first piston assembly 21 further includes an elastic reset component 214. One end of the elastic reset component 214 is connected to the valve body assembly 10, and the other end of the elastic reset component 214 is connected to the first piston assembly 21. The elastic reset component 214 ensures that the valve can return to its original state in the event of significant fluctuations in liquid level, and guarantees that the drain pressure valve 50 will only open when the incoming negative pressure reaches a certain concentration, preventing accidental activation and ensuring good operational stability.

[0052] Reference Figure 10 As shown, this invention discloses a sewage discharge control system, including a sewage tank 40, a discharge pressure valve 50, a negative pressure device 60, a sewage collection tank 80, and the hinged pneumatic pilot valve described in any of the above embodiments. The sewage tank 40, discharge pressure valve 50, and negative pressure device 60 are all prior art and will not be described in detail. The mounting through-hole 112 is connected to the sewage tank 40, and the negative pressure through-hole 111 is connected to the negative pressure device 60; the inlet through-hole 51 of the discharge pressure valve 50 is connected to the sewage tank 40, the valve through-hole 52 of the discharge pressure valve 50 is connected to the working through-hole 113, the discharge negative pressure through-hole 53 of the discharge pressure valve 50 is connected to the negative pressure device 60, and the sewage collection tank 80 is connected to the discharge negative pressure through-hole 53 of the discharge pressure valve 50. Since the sewage discharge control system of this invention includes the hinged pneumatic pilot valve described in the above embodiments, it possesses all the advantages of the aforementioned system and will not be repeated.

[0053] Preferably, the connection is achieved through the pipe body 70. Preferably, the pipe body 70 is a vacuum bellows. Preferably, the discharge flow rate of the negative pressure device 60 is set to 1-5 m³ / h. 3 / h. The flow rate inside the level sensing tube 30 is set to 5-10 MPa. The negative pressure device 60 is set to an air compressor. The opening negative pressure of the drain pressure valve 50 is set to -0.1 MPa.

[0054] Working principle:

[0055] As the liquid level in the sewage tank 40 rises, when the liquid in the level sensing tube 30 reaches the first rated liquid level height 311, the control mechanism switches from the first state to the second state. The liquid in the level sensing tube 30 and the gas between the second piston assembly 22 are subjected to liquid force, increasing the gas pressure and causing the second piston assembly 22 to move relatively away from the mounting through hole 112. At this time, the counter-pressure connecting rod 242 rotates under the force of the piston rod 243, driving the counter-pressure rod 244 connected to its second end 2422 to move, thereby causing the first piston assembly 21 to move relatively closer to the second piston assembly 22. The sealing component 212 separates from the negative pressure through hole 111, opening the negative pressure through hole 111. External negative pressure enters the receiving cavity 11 from the negative pressure through hole 111 and connects to the working through hole 113. When the liquid in the level sensing tube 30 rises to the second rated liquid level height 312, the limiting component 213 limits the first piston body 211, and the limiting component 213 blocks the second air pressure through hole 2111. The first piston assembly 21 blocks the first air pressure through hole 114. When the negative pressure reaches the opening negative pressure of the sewage discharge pressure valve 50, the valve of the sewage discharge pressure valve 50 opens, and under the action of the negative pressure device 60, the sewage in the sewage tank 40 is discharged into the sewage collection tank 80.

[0056] As sewage is discharged, the liquid level in the level sensing tube 30 decreases, and the control mechanism switches from the second state to the first state. Correspondingly, the air pressure decreases, and the counterweight component 222, under its own weight, moves the second piston body 221 closer to the mounting through hole 112. At this time, the counter-pressure connecting rod 242 rotates under the force of the piston rod 243, and moves the counter-pressure rod 244 connected to its second end 2422. The first piston assembly 21 moves away from the second piston assembly 22 under the force of the elastic reset component 214 and the counter-pressure rod 244. When the liquid level drops below the first rated liquid level height 311, the control mechanism enters the first state, the sealing component seals the negative pressure through hole 111, and the first air pressure through hole 114, the second air pressure through hole 2111, and the working through hole 113 are interconnected. After the negative pressure is lost, the drain pressure valve 50 closes.

[0057] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A hinged pneumatic pilot valve, characterized in that, include: A valve body assembly is hollow along its own axis of symmetry, forming a receiving cavity. One end of the receiving cavity along its own axis of symmetry has a negative pressure through hole for communicating with external negative pressure. The other end of the receiving cavity along its own axis of symmetry has an installation through hole. The cavity wall of the receiving cavity has a first air pressure through hole and a working through hole. The first air pressure through hole is for communicating with external atmospheric pressure, and the working through hole is for communicating with the outside. A control mechanism includes a first piston assembly, a second piston assembly, and a counter-pressure assembly. The first piston assembly is disposed within the receiving cavity near the negative pressure through-hole. The first piston assembly includes a first piston body and a sealing component. The first piston body is slidably sealed to the cavity wall of the receiving cavity, and a second air pressure through-hole is provided on the first piston body. The sealing component is disposed on the first piston body. The second piston assembly is disposed within the receiving cavity near the mounting through-hole. The second piston assembly includes a second piston body and a counterweight component. The second piston body is slidably sealed to the cavity wall of the receiving cavity. The counterweight component is connected to the second piston body. The counter-pressure assembly is disposed between the first piston assembly and the second piston assembly, and is connected to both the first piston assembly and the second piston assembly. The counter-pressure assembly is used to move the first piston assembly relatively closer to or relatively farther away from the second piston assembly. The counter-pressure assembly has a hinged structure. The control mechanism includes a first state and a second state. When the control mechanism is in the first state, the counterweight component moves the second piston body relatively closer to the mounting through hole, causing the counter-pressure component to move the first piston assembly relatively away from the second piston assembly. The sealing component blocks the negative pressure through hole, and the first air pressure through hole, the second air pressure through hole, and the working through hole are interconnected. When the control mechanism is in the second state, external air pressure moves the second piston assembly relatively away from the mounting through hole, causing the counter-pressure component to move the first piston assembly relatively closer to the second piston assembly. The first piston assembly blocks the first air pressure through hole, the sealing component moves away from the negative pressure through hole, and the negative pressure through hole is interconnected with the working through hole.

2. The hinged pneumatic pilot valve according to claim 1, characterized in that, Also includes: A liquid level sensor is disposed on the mounting through hole. The liquid level sensor is used to contact external liquid and is provided with a rated liquid level height. When the height of the external liquid inside the liquid level sensing tube is lower than the rated liquid level, the control mechanism enters the first state; when the rated liquid level is lower than the height of the external liquid inside the liquid level sensing tube, the control mechanism enters the second state.

3. The hinged pneumatic pilot valve according to claim 1 or 2, characterized in that, The pressure-resisting assembly includes: A fixing rod, one end of which is fixedly connected to the cavity wall of the receiving cavity; A counter-pressure connecting rod, wherein the counter-pressure connecting rod is rotatably connected to the end of the fixed rod away from the cavity wall of the receiving cavity; A piston rod, one end of which is connected to the second piston assembly, and the other end of which is rotatably connected to the first end of the counter-pressure connecting rod; The pressure rod has one end rotatably connected to the second end of the pressure connecting rod, and the other end rotatably connected to the first piston assembly.

4. The hinged pneumatic pilot valve according to claim 3, characterized in that: The normals of the piston end faces of the first piston body and the second piston body are both parallel to the axial axis of the symmetry axis of the receiving cavity. Two of each of the fixed rod, the counter-pressure connecting rod, and the counter-pressure rod are provided. The axes of symmetry of the two fixed rods are parallel, and the axes of symmetry of both fixed rods are perpendicular to the axis of symmetry of the receiving cavity. The axes of symmetry of the two counter-pressure connecting rods are perpendicular to the axes of symmetry of the fixed rods. A sliding groove is formed on the first end of each of the two counter-pressure connecting rods along its own axis of symmetry. The piston rod includes a first rod segment and a second rod segment. The axis of symmetry of the first rod segment is parallel to the axis of symmetry of the receiving cavity. One end of the first rod segment is fixedly connected to the second piston assembly, and the other end of the first rod segment is fixedly connected to the middle position of the second rod segment. The axis of symmetry of the second rod segment is perpendicular to the axis of symmetry of the receiving cavity. Both ends of the second rod segment are rotatably connected to the corresponding first ends, and the rotatable connection points of both are movably set in the corresponding sliding grooves. The axes of symmetry of the two counter-pressure rods are perpendicular to the axes of symmetry of the fixed rods.

5. The hinged pneumatic pilot valve according to claim 4, characterized in that, Displacement of the first piston body and the displacement of the second piston body The following relationship must be satisfied: ， ， in, a The length of the first rod segment is... b The length of the counterweight connecting rod. c The length of the compression bar. k It is the ratio of the distance from the first end to the fixed rod to the distance from the first end to the second rod segment. θ The angle between the pressure rod and the first piston body; l 1 The length of the second segment is... l 2 The distance between the two counter-pressure rods on the first piston assembly.

6. The hinged pneumatic pilot valve according to claim 2, characterized in that: The liquid level sensing tube is equipped with a filter component at its inlet end.

7. The hinged pneumatic pilot valve according to claim 1, characterized in that: The first piston assembly further includes a limiting component, which is disposed on the cavity wall of the receiving cavity and is located on the side of the first air pressure through hole axially away from the negative pressure through hole along the axis of symmetry of the receiving cavity. The limiting component limits the sliding of the first piston body.

8. The hinged pneumatic pilot valve according to claim 7, characterized in that: The second air pressure through hole is disposed on the piston side wall of the first piston body; when the control mechanism is in the second state, the limiting component blocks the second air pressure through hole.

9. The hinged pneumatic pilot valve according to claim 1, characterized in that: The first piston assembly further includes an elastic reset component, one end of which is connected to the valve body assembly, and the other end of which is connected to the first piston assembly.

10. A sewage discharge control system, characterized in that, The system includes a sewage tank, a sewage discharge pressure valve, a negative pressure device, a sewage collection tank, and a hinged pneumatic pilot valve as described in any one of claims 1-9; the mounting through hole is connected to the sewage tank, the negative pressure through hole is connected to the negative pressure device; the liquid inlet through hole of the sewage discharge pressure valve is connected to the sewage tank, the valve through hole of the sewage discharge pressure valve is connected to the working through hole, the sewage discharge negative pressure through hole of the sewage discharge pressure valve is connected to the negative pressure device, and the sewage collection tank is connected to the sewage discharge negative pressure through hole of the sewage discharge pressure valve.

Images