Passive dual liquid level control method based on mechanical structure

Abstract

A kind of passive double liquid level control method based on mechanical structure, first by passive double liquid level mobile device drive lifting frame moves, again by lifting frame movement control the movement of steel ball, make steel ball roll between lifting frame and lever, to control the rotation of lever, make the front end of lever release or compress the control switch of valve, to control the opening or closing of valve.In the present application, the control switch of valve is completely automatically controlled by the rise and fall of liquid level in vacuum well, which can save labor and labor cost;When the floating ball moves along the floating rod between the first stop and the second stop, the state of the control switch of the valve can be maintained for a long time;And by changing the length of the floating rod between the first stop and the second stop, double liquid level control of super long distance can be realized.

Description

Technical Field

[0001] This invention relates to a method for automatic control of valves, and more specifically, to a dedicated automatic control valve method that utilizes high and low liquid level changes to achieve dual-level control of valve opening and closing. Background Technology

[0002] Automatic water level control valves are frequently used in many devices. Due to their simple structure and low cost, purely mechanical float control valves are particularly widely used. In wastewater treatment, a sewage discharge valve is needed to control the liquid level in the wastewater tank during the extraction process. However, existing sewage discharge valves generally use sensors and electronic switches to control the sewage extraction and discharge process. Due to humid environments and harsh operating conditions, electronic control of the valve often leads to moisture damage and leakage of the electronic switches, causing them to malfunction. Therefore, it is essential to design a sewage discharge valve with good sealing properties that can operate in humid and complex environments without requiring electrical or chemical energy input. This invention aims to design a passive dual-level control system with the above advantages, mainly for urban drainage projects, domestic sewage, and vacuum collection and drainage of seepage water from underground buildings. It offers advantages such as high reliability, energy saving, and low construction costs.

[0003] In existing technology, there is a known float valve that includes a float and a valve body. A pressure valve is housed within the valve body, and a pressure rod is mounted on the pressure valve. The pressure rod is supported on the float wall. When the water level drops, the float descends, the force on the pressure rod decreases, and the pressure valve opens to allow water to flow in. When the water level rises, the float gradually rises, the force on the pressure rod gradually increases, pushing the pressure valve to close. Because this design lacks other switches or limit devices, it cannot achieve dual-position water level control, limiting its application. Furthermore, its high sensitivity leads to frequent opening and closing during use, resulting in a limited service life. Patent CN 1483975A discloses a two-position control float valve, including a float and a valve body. The left side of the float is connected to the right end of a float arm, and the left end of the float arm is provided with a fork. The float arm is rotatably connected to a connecting rod. A moving valve core is fixed to a spindle, and the right end of the spindle has a bend that inserts into the fork. The valve body contains a moving valve core and a fixed valve core, and the moving and fixed valve cores have matching water holes. The valve is opened and closed by using a fork with a certain spacing to drive the bend of the spindle and rotate it. This solves the problem of two-position control. However, there are still shortcomings: First, because the upper and lower liquid level differences within the control range are the same as the spacing of the fork, the stroke of the bend within the fork is limited, making it only suitable for replenishment two-position control with small liquid level differences. Summary of the Invention

[0004] The technical problem to be solved by this invention is that the current sewage discharge devices have a complex structure, require energy input such as electricity for control, have low reliability when used in complex environments such as humid environments, and have high energy consumption and construction costs, making it difficult to achieve long-stroke dual-level control of valves. The invention proposes a method to achieve ultra-long-stroke dual-level control of valves by relying solely on the buoyancy of water on the float.

[0005] To address the aforementioned problems, the technical solution proposed in this invention is: a passive dual-level control method based on a mechanical structure. First, a passive dual-level moving device drives a lifting frame to move. Then, the movement of the lifting frame controls the movement of a steel ball, causing the steel ball to roll between the lifting frame and the lever to control the rotation of the lever. This causes the front end of the lever to loosen or tighten the control switch of the valve, thereby controlling the opening or closing of the valve.

[0006] Preferably, a transverse spring is also provided, with an upper side at the rear end of the lever, which is hooked by the transverse spring; when the steel ball rolls from the rear end of the lever into the lifting frame, the lever rotates under the elastic force of the transverse spring, thereby pressing the control switch of the valve at the front end of the lever and closing the valve.

[0007] Preferably, a lifting frame is provided behind the lever, and the lower end of the lifting frame is connected to the passive dual-level moving device. A flap is hinged in the lifting frame. When the steel ball is located on the flap of the lifting frame and the passive dual-level moving device drives the lifting frame to move upward, the lifting frame can drive the flap to rotate counterclockwise, causing the steel ball to roll down from the lifting frame to the rear end of the lever, causing the lever to rotate clockwise, thereby releasing the control switch of the valve at the front end of the lever to open the valve.

[0008] Preferably, support plates are provided on both sides of the lever, and a stop protrusion is provided on the inner side of each support plate. The front end of the flap extends out of the lifting frame. When the lifting frame moves upward, the rear end of the flap moves upward with the lifting frame. During the upward movement, the front end of the flap will abut against the stop protrusion of the support plate, causing the flap to rotate counterclockwise and causing the steel ball to roll out of the lifting frame.

[0009] Preferably, when the steel ball is located at the rear end of the lever and the valve is in the open state: the passive dual-level moving device drives the lifting frame to move downward, so that the steel ball rolls back into the lifting frame from the rear end of the lever along the flap under the action of gravity, thereby causing the lever to rotate counterclockwise under the elastic force of the transverse spring, so that the front end of the lever presses against the control switch of the valve, thereby closing the valve.

[0010] Preferably, the passive dual-level moving device includes a float, a float rod, a first stop, and a second stop. The first stop and the second stop are both installed on the float rod, and the float is fitted onto the float rod with the float located between the first stop and the second stop. When the float moves along the float rod, the float can abut against the first stop or the second stop.

[0011] Preferably, the float is placed in the liquid. When the liquid rises, the float moves upward under the action of buoyancy until it hits the first stop. At this time, the float drives the float rod and the lifting frame to move upward in sequence, causing the flap to rotate counterclockwise. This allows the steel ball to fall to the rear end of the lever, causing the lever to rotate clockwise, which in turn releases the control switch of the valve at the front end of the lever to open the valve.

[0012] Preferably, when the liquid level drops, the float moves downward along the float rod under the action of gravity until the float moves downward and hits the second stop. At this time, the float drives the float rod and the lifting frame to move downward in sequence. When the height of the flapper is lower than the height of the rear end of the lever, the steel ball rolls back into the lifting frame from the rear end of the lever under the action of gravity, causing the lever to rotate counterclockwise. This causes the front end of the lever to press the control switch of the valve under the elastic force of the transverse spring, thereby closing the valve.

[0013] Preferably, a vertical spring is also provided, with the lower end of the vertical spring hooking the lifting frame. When the lifting frame is located at the upper end of the guide plate and the steel ball is located at the rear end of the lever: under the action of the weight of the steel ball, the lever rotates clockwise, and the control switch of the valve opens; at this time, the elastic force of the vertical spring is used to balance the weight of the lifting frame and the passive dual liquid level moving device; and during the process of the float moving between the first stop and the second stop as the liquid rises and falls, the valve can maintain its original open state.

[0014] Preferably, a transverse spring is also provided, with one end of the transverse spring hooked onto the upper side of the rear end of the lever. When the lifting frame is located at the lower end of the guide plate and the steel ball is located in the lifting frame, the torque generated by the elastic force of the transverse spring can balance the gravity at the rear end of the lever and the torque generated by the supporting force of the valve control switch, so that the valve control switch remains closed; and the valve can maintain its original closed state as the float moves between the first stop and the second stop with the rise and fall of the liquid.

[0015] The beneficial technical effects of this invention are:

[0016] 1. In this invention, the valve control switch is automatically controlled by the rise and fall of the liquid level in the vacuum well, without the need for personnel intervention. It can automatically control the valve control switch in a timely and effective manner, saving manual labor and labor costs.

[0017] 2. In this invention, the valve's state does not require electrical components to sense it, and the opening and closing of the valve does not require electrical components to control it. That is, the opening and closing of the valve does not require any external power; it is entirely generated by the buoyancy of the water in the vacuum well on the float.

[0018] 3. In this invention, the control switch state of the valve is triggered by the movement of a float along the float rod, where it abuts against the first or second stop at either end of the float rod. However, when the float moves between the first and second stops, it does not change the control switch state of the valve, thus maintaining the control switch state of the valve for a long period.

[0019] 4. The present invention has a simple structure, low cost, and small size, and occupies little space when placed in a vacuum well.

[0020] 5. This invention is made of waterproof materials such as stainless steel or plastic, has a stable structure, is not easily deformed, can be used in humid environments, and has a long service life.

[0021] 6. Because the float of this invention rises and falls with the water level, and moves up and down along the float rod between the first and second stops, the state of the valve's control switch remains unchanged. Therefore, ultra-long-distance dual-level control can be achieved by changing the length of the float rod between the first and second stops. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of Example 1;

[0023] Figure 2 This is a three-dimensional structural diagram of Example 1 after removing the passive dual-level moving device;

[0024] Figure 3 This is a three-dimensional structural diagram of Example 1 excluding the passive dual-level moving device and the right-side support plate;

[0025] Figure 4 This is a schematic diagram of the lifting frame, lever, and valve in Example 1;

[0026] Figure 5 This is an enlarged view of the three-dimensional structure of the support plate;

[0027] Figure 6 A 3D structural diagram of the lifting frame, steel balls, and flap.

[0028] Figure 7 This is an enlarged view of the 3D structure of the lifting frame;

[0029] Figure 8 This is an enlarged cross-sectional view of the float.

[0030] In the diagram: Base plate 01, Bottom hole 02, Support plate 1, Support lug 11, Protrusion 12, Folding plate 13, Strip hole 14, Mounting plate 15, Guide plate 16, Lifting frame 2, Bottom frame plate 21, Top frame plate 22, Back plate 23, Positioning groove 24, Horizontal plate 25, Lifting lug 26, Hook 27, Side frame plate 28, Float 3, Outer side wall 31, Inner side wall 32, Cavity 33, Sliding hole 34, Float rod 4, First stop 41, Second stop 42, Lifting ring 43, Steel ball 5, Flip plate 6, Lever 7, Positioning hole 71, Spacer 72, Upper side 73, Lower side 74, Valve 8, Control switch 81, Front hinge rod 91, Rear hinge rod 92, Vertical spring 93, Horizontal spring 94, Crossbar 95. Detailed Implementation

[0031] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0032] Example 1

[0033] like Figure 1 , Figure 2 and Figure 5 As shown, this embodiment includes a passive dual-level moving device, a support mechanism, a lifting frame 2, a steel ball 5, and a lever 7. The support mechanism includes a base plate 01, support plates 1, and a crossbar 95. Two support plates 1 are arranged parallel to each other on the base plate 01, and the lower end of each support plate 1 is bent outward to form a mounting plate 15, which is then fixed to the base plate 01. The rear end of each support plate 1 is bent inward to form a guide plate 16, with the length direction of the guide plate 16 being perpendicular to the vertical direction. A crossbar 95 passes through the two support plates 1, fixing both support plates 1 to the crossbar 95.

[0034] Each support plate 1 is provided with an inwardly protruding stop 12, and the rear end of the stop 12 of each support plate 1 has a vertically oriented strip hole 14. The front end of one support plate 1 is also provided with a folding plate 13, on which a transverse spring 94 is connected. Both ends of the transverse spring 94 are provided with hooks, and the other end of the transverse spring 94 hooks onto the upper side 73 of the lever 7. The upper end of each support plate 1 is provided with an outwardly bent support lug 11, and both ends of the vertical spring 93 are provided with hooks. The upper hook of the vertical spring 93 hooks onto the support lug 11 of the support plate 1, and the lower hook of the vertical spring 93 hooks onto the lifting frame 2.

[0035] like Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7As shown, the upper end of the lifting frame 2 is provided with a top frame plate 22, the lower end of the lifting frame 2 is provided with a bottom frame plate 21, and the rear end of the lifting frame 2 is provided with a back plate 23. The upper end of the back plate 23 is seamlessly connected to the top frame plate 22, and the lower end of the back plate 23 is seamlessly connected to the bottom frame plate 21. Side frame plates 28 are provided on both sides of the front end of the lifting frame 2. The upper end of the side frame plate 28 is connected to the top frame plate 22, and the lower end of the side frame plate 28 is connected to the bottom frame plate 21. The top frame plate 22 and the bottom frame plate 21 both have inwardly recessed positioning grooves 24. The guide plate 16 at the rear end of the support plate 1 engages in the positioning grooves 24 of the top frame plate 22 and the bottom frame plate 21, allowing the lifting frame 2 to move along the guide plate 16. The crossbar 95 stabilizes the support plate 1, and the crossbar 95 at the upper and lower ends of the support plate 1 located at the position of the lifting frame 2 also acts as a stop, preventing the lifting frame 2 from detaching from the guide plate 16 when moving upward or downward.

[0036] A flap 6 is provided in the lifting frame 2, with its rear end inside the lifting frame 2 and its front end extending out of the lifting frame 2. Through mounting holes are provided on the side frame plates 28 on both sides of the lifting frame 2, and both ends of the rear hinge rod 92 pass through these mounting holes. The bottom of the flap 6 is fixedly connected to the rear hinge rod 92, so that the flap 6 is hinged inside the lifting frame 2. When the steel ball 5 is located in the lifting frame 2, the steel ball 5 presses against the flap 6, and the steel ball 5 is located at the rear end of the flap 6. A C-shaped opening is provided at the front end of the flap 6, and when the steel ball 5 is at the rear end of the lever 7, the lower end of the steel ball 5 abuts against the front end of the flap 6.

[0037] The bottom frame plate 21 of the lifting frame 2 bends downward and is seamlessly connected to the crossbar 95. The lateral width of the crossbar 95 is greater than that of the bottom frame plate 21. Grooves are formed on the lower sides of both sides of the crossbar 95, forming lifting lugs 26. The lifting lugs 26 on both sides of the crossbar 95 pass through the strip holes 14 on the two support plates 1 respectively. The hook at the upper end of the vertical spring 93 hooks onto the support lug 11 of the support plate 1, and the hook at the lower end of the vertical spring 93 hooks onto the lifting lugs 26 on the bottom frame plate 21 of the lifting frame 2. A hook 27 is connected to the lower middle end of the crossbar 95, and a lifting ring 43 is provided at the upper end of the float 4. The lifting ring 43 is embedded in the hook 27, so that the float 4 can drive the lifting frame 2 to move.

[0038] The front hinge rod 91 passes through the two support plates 1 and the lever 7, hinged between the two support plates 1. The front of the front hinge rod 91 is the front end of the lever 7, and the rear end of the lever 7 is the rear end of the lever 7. The front end of the lever 7 is positioned directly above the control switch 81 of the valve 8. When the lever 7 rotates clockwise, the front end of the lever 7 releases the control switch 81 of the valve 8, thereby opening the valve 8; when the lever 7 rotates counterclockwise, the front end of the lever 7 presses against the control switch 81 of the valve 8, thereby closing the valve 8.

[0039] The rear end of lever 7 is A-shaped. The upper side of the A-shaped lever 7 is called the upper side 73, and the lower side of the A-shaped lever 7 is called the lower side 74. An arc-shaped partition 72 is also provided between the upper side 73 and the lower side 74. When the steel ball 5 is located at the rear end of lever 7, the steel ball 5 presses on the lower side 74, and the front end of the steel ball 5 abuts against the partition 72. At this time, the two sides of the front end of the flap 6 abut against the two sides of the lower end of the steel ball 5.

[0040] The lever 7 has two or more positioning holes 71 on its upper side 73, which are evenly distributed along the length of the upper side 73. One end of the hook of the transverse spring 94 is hooked onto the folding plate 13, and the other end of the hook of the transverse spring 94 is hooked into the positioning hole 71 on the upper side 73 of the lever 7. This ensures that the torque generated by the elastic force of the transverse spring 94 can balance the weight of the steel ball 5 and the rear end of the lever 7, as well as the torque generated by the supporting force of the control switch 81 of the valve 8.

[0041] like Figure 1 , Figure 3 , Figure 4 and Figure 8 As shown, the passive dual-level moving device includes a float 3, a float rod 4, a first stop 41, and a second stop 42. The first stop 41 is installed at the upper end of the float rod 4, and the second stop 42 is installed at the lower end of the float rod 4. The first stop 41 and the second stop 42 are firmly connected to the float rod 4 and will not move relative to the float rod 4. The float 3 is fitted onto the float rod 4 and is located between the first stop 41 and the second stop 42. A through bottom hole 02 is opened on the bottom plate 01, and the upper end of the float rod 4 passes through the bottom hole 02. A lifting ring 43 is provided at the upper end of the float rod 4, and the lifting ring 43 is engaged in the hook 27 at the lower end of the lifting frame 2, so that the float rod 4 can drive the lifting frame 2 to move.

[0042] The float 3 includes an outer side wall 31 and an inner side wall 32. The inner side wall 32 forms a hollow circular tube, and the hollow portion is a sliding hole 34. The float 3 is fitted onto the float rod 4 through the sliding hole 34. The float rod 4 is a smooth rod, allowing the float 3 to move freely along the float rod 4. The outer side wall 31 is located outside the inner side wall 32, and the outer side wall 31 and the inner side wall 32 are seamlessly connected. The outer side wall 31 and the inner side wall 32 form a closed, annular cavity 33.

[0043] like Figures 1 to 8 As shown, the specific principle of this embodiment is as follows: the entire device is fixedly installed in a vacuum well, and the lifting frame 2, steel ball 5, lever 7, and other components in the device are enclosed by a shield, leaving only the passive dual-level moving device exposed outside the shield. In other words, the water in the vacuum well will not come into contact with the components inside the shield, but can only come into contact with the passive dual-level moving device outside the shield.

[0044] As the water level in the vacuum well rises, the float 3 moves upward along the float rod 4 under the buoyancy of the water. Since the steel ball 5 automatically falls into the lifting frame 2 when the water level is low, it is currently in the lifting frame 2. As the water level gradually rises, the float 3 abuts against the first stop 41 on the float rod 4. The lifting frame 2 is also subjected to an upward pulling force from the vertical spring 93. At this time, the sum of the buoyancy force on the float 3 and the pulling force of the vertical spring 93 is greater than the weight of the steel ball 5, the lifting frame 2, and the passive dual-level moving device. This allows the float 3 to drive the float rod 4 upward through the first stop 41, and the float rod 4, in turn, drives the lifting frame 2 upward along the guide plate 16 via the hook 27. The flapper 6 and the steel ball 5 in the lifting frame 2 move upward together with the lifting frame 2.

[0045] As the lifting frame 2 and the flip plate 6 move upward together, the front end of the flip plate 6 abuts against the stop protrusion 12 on the inner side of the support plate 1 during its forward movement, thus obstructing the front end of the flip plate 6. Meanwhile, the rear end of the flip plate 6 continues to rise, therefore, the flip plate 6, hinged within the lifting frame 2, will rotate counterclockwise. (From...) Figure 3 or Figure 4 (From the perspective of the angle) the height of the rear end of the flap 6 is greater than the height of the front end of the flap 6, and the steel ball 5 rolls forward along the flap 6 to the rear end of the A-shaped lever 7 under the action of gravity.

[0046] Under the influence of gravity on steel ball 5, the rear end of lever 7 rotates downwards, i.e., lever 7 rotates clockwise. At this time, the front end of lever 7 rotates upwards, causing the front end of lever 7 to release the control switch 81 of valve 8, thus opening the control switch 81 of valve 8. Simultaneously, the transverse spring 94 is stretched, and the torque generated by the elastic force of the transverse spring 94 balances the torque generated by the gravity of steel ball 5 and the rear end of lever 7. After the control switch 81 of valve 8 is opened, the vacuum well begins to drain water, causing the water level in the vacuum well to continuously decrease.

[0047] As the water level drops, float 3 moves downward along float rod 4. During this period, before float 3 abuts against the second stop 42, the lifting frame 2 remains above the guide plate 16 due to the tension of the vertical spring 93. The horizontal spring 94 hooks into a positioning hole 71 on the upper side 73 of lever 7, causing the rear end of lever 7 to tilt only slightly downward. At this time, the bottom of steel ball 5 presses against the lower side 74 of lever 7, and steel ball 5 tends to roll backward, but its rear end abuts against the front end of flap 6, so steel ball 5 remains at the rear end of lever 7 and will not fall. At this time, the elasticity of vertical spring 93 is used to balance the weight of lifting frame 2 and passive dual-level moving device, as well as the downward pressure of steel ball 5 on flap 6. During this process, the control switch 81 of valve 8 remains open.

[0048] As the water level continues to drop, the float 3 comes into contact with the second stop 42. Under the influence of gravity, the float 3 drives the float rod 4 and the lifting frame 2 downwards in sequence, stretching the vertical spring 93. As the lifting frame 2 moves downwards, the supporting force of the front end of the flap 6 on the steel ball 5 gradually decreases. Until the height of the rear hinge rod 92 of the hinged flap 6 is less than the height of the rear end of the lower side 74 of the lever 7, the steel ball 5, under the influence of gravity, rolls down along the lower side 74 of the lever 7 and the flap 6 into the lifting frame 2.

[0049] After the steel ball 5 enters the lifting frame 2, the weight of the steel ball 5 pressing on the lever 7 disappears. Under the elastic force of the transverse spring 94, the lever 7 rotates counterclockwise, causing the front end of the lever 7 to press against the control switch 81 of the valve 8 under the elastic force of the transverse spring 94, thereby closing the valve 8. After the valve 8 is closed, the vacuum well stops draining water.

[0050] After the steel ball 5 enters the lifting frame 2, under the action of the weight of the steel ball 5, the rear end of the flap 6 sinks down and abuts against the bottom frame plate 21, while the front end of the flap 6 tilts upward. Since the height of the end of the flap 6 near the back plate 23 of the lifting frame 2 is less than the height of the rear hinge rod 92 of the flap 6, the steel ball 5 can be relatively stably positioned inside the lifting frame 2.

[0051] When external water flows into the vacuum well, causing the water level to gradually rise, and during the period before the float 3 abuts against the first stop 41, the float 3 does not exert an upward force on the float rod 4. Therefore, the lifting frame 2 remains at the lower end of the guide plate 16 and does not rise with the float 3. During this period, the torque generated by the elastic force of the transverse spring 94 balances the weight of the rear end of the lever 7 and the torque generated by the upward supporting force of the control switch 81 of the valve 8, ensuring that the front end of the lever 7 remains pressed against the control switch 81 of the valve 8, thus maintaining the valve 8 in its original closed state.

[0052] In this embodiment, when the lifting frame 2 is at the lower end or the upper end of the guide plate 16, the vertical spring 93 applies an upward pulling force to the lifting frame 2; similarly, when the front end of the lever 7 is pressed against the control switch 81 of the valve 8 or when the front end of the lever 7 releases the control switch 81 of the valve 8, the horizontal spring 94 applies a pulling force to the lever 7 in the front direction.

[0053] Obviously, any improvements or modifications made without departing from the principles described in this invention should be considered within the scope of protection of this invention.

Claims

1. A passive dual-level control method based on a mechanical structure, characterized in that, First, a passive dual-level moving device drives the lifting frame to move. Then, the movement of the lifting frame controls the movement of the steel ball, causing the steel ball to roll between the lifting frame and the lever. This controls the rotation of the lever, causing the front end of the lever to release or press the control switch of the valve, thereby controlling the opening or closing of the valve. A transverse spring is also provided, with an upper side at the rear end of the lever, which is hooked by the transverse spring. When the steel ball rolls from the rear end of the lever into the lifting frame, the elastic force of the transverse spring causes the lever to rotate, thereby pressing the front end of the lever against the control switch of the valve, closing the valve. A lifting frame is located behind the lever, with its lower end connected to the passive dual-level moving device. The device is connected to a hinged flap in the lifting frame. When the steel ball is on the flap of the lifting frame and the passive dual-level moving device moves the lifting frame upward, the lifting frame can rotate the flap counterclockwise, causing the steel ball to roll down from the lifting frame to the rear end of the lever. This causes the lever to rotate clockwise, thus releasing the control switch of the valve at the front end of the lever to open the valve. Support plates are set on both sides of the lever, and the rear end of each support plate is bent inward to form a guide plate. When the steel ball is at the rear end of the lever and the valve is in the open state, the passive dual-level moving device moves the lifting frame downward, causing the steel ball to roll down from the rear end of the lever along the flap under the action of gravity. The lever rotates counterclockwise under the force of the transverse spring, causing the front end of the lever to press against the control switch of the valve, thus closing the valve. The passive dual-level moving device includes a float, a float rod, a first stop, and a second stop. The first and second stops are mounted on the float rod, and the float is fitted onto the float rod, positioned between the first and second stops. When the float moves along the float rod, it can abut against either the first or second stop. A vertical spring is also provided, with its lower end hooking the lifting frame. When the lifting frame is at the upper end of the guide plate and the steel ball is at the rear end of the lever: under the action of the steel ball's gravity... When the lever rotates clockwise, the valve's control switch opens. At this time, the force of the vertical spring balances the weight of the lifting frame and the passive dual-level moving device. As the float moves between the first and second stops with the rise and fall of the liquid, the valve maintains its open state. When the lifting frame is at the lower end of the guide plate and the steel ball is within the lifting frame, the torque generated by the force of the horizontal spring balances the weight at the rear end of the lever and the torque generated by the supporting force of the valve's control switch, keeping the valve's control switch closed. As the float moves between the first and second stops with the rise and fall of the liquid, the valve maintains its closed state.

2. The passive dual-level control method based on a mechanical structure according to claim 1, characterized in that, A stop protrusion is set on the inner side of each support plate. The front end of the flap extends out of the lifting frame. When the lifting frame moves upward, the rear end of the flap moves upward with the lifting frame. During the upward movement, the front end of the flap will abut against the stop protrusion of the support plate, causing the flap to rotate counterclockwise and causing the steel ball to roll out of the lifting frame.

3. The passive dual-level control method based on a mechanical structure according to claim 2, characterized in that, When the float is placed in the liquid, as the liquid rises, the float moves upward under the action of buoyancy until it hits the first stop. At this time, the float drives the float rod and the lifting frame to move upward in sequence, causing the flap to rotate counterclockwise. This allows the steel ball to fall to the rear end of the lever, causing the lever to rotate clockwise, which in turn releases the control switch of the valve at the front end of the lever to open the valve.

4. The passive dual-level control method based on a mechanical structure according to claim 3, characterized in that, As the liquid level drops, the float moves downward along the float rod under the influence of gravity until it reaches the second stop. At this point, the float drives the float rod and the lifting frame downward in sequence. When the height of the flapper plate is lower than the height of the rear end of the lever, the steel ball rolls back into the lifting frame from the rear end of the lever under the influence of gravity, causing the lever to rotate counterclockwise. This causes the front end of the lever to press against the control switch of the valve under the elastic force of the transverse spring, thereby closing the valve.

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