A filter screen quick-opening anti-overflow valve

Abstract

This invention relates to the field of anti-overflow valve technology, specifically a quick-opening anti-overflow valve with a filter screen; it includes an outer shell and a first spacer ring on the inner side of the outer shell; an air intake connector is laterally connected to the outer shell space above the first spacer ring; a flow pipe is fixedly connected downwards to the inner edge of the first spacer ring; four limiting rods surrounding the flow pipe are fixedly connected downwards to the first spacer ring; an anti-detachment ring is fixedly connected to the lower end of the four limiting rods; floats are provided on the inner sides of the four limiting rods; a filter screen cylinder is inverted on the upper surface of the first spacer ring; a second sealing ring is fixedly connected to the outer surface of the upper end of the outer shell. This invention achieves quick assembly and disassembly of the filter screen cylinder through the cooperation of the top cover, L-shaped lock, and first spring, while avoiding the problem of inconvenient disassembly caused by easy corrosion of bolt connections, saving maintenance time and improving the operating efficiency of the vacuum truck; the setting of the limiting sleeve and limiting ring ensures the stability of component operation and ensures smooth filtration and gas flow.

Description

Technical Field

[0001] This invention relates to the field of anti-overflow valve technology, specifically a filter quick-opening anti-overflow valve. Background Technology

[0002] Vacuum trucks are mainly used for collecting and transporting urban sewage, sludge, or other liquid waste. They are important vehicles in municipal sanitation, sewage treatment, and other fields. During operation, a vacuum pump extracts gas from the tank to create a negative pressure environment, allowing sewage to be drawn into the tank along the suction pipe. The gas inside the tank is then discharged through an overflow valve before being extracted by the suction pump to maintain the tank's continuous suction capacity. As the amount of sewage in the tank increases, the liquid level rises, causing the float in the overflow valve to move upwards. When the liquid level reaches a preset height, the float blocks the overflow valve's vent, thus preventing overflow and protecting the pump from sewage entering and damaging the equipment. To prevent debris such as plastic particles, branches, and stones from entering the overflow valve and causing the float to become stuck or the vent to become blocked, a filter screen is usually installed at the inlet of the overflow valve to pre-filter the sewage entering the valve, protecting the float and the valve's internal components for proper operation.

[0003] Currently, the filter screens of existing sewage suction truck overflow valves are mostly fixed to the valve body using bolt connections. Since sewage suction trucks often operate in environments with sewage, moisture, or corrosive media, the bolts are prone to rust and corrosion after long-term use, making it difficult to disassemble the filter screen. Operators often need to spend a lot of time and effort to clean the filter screen or replace damaged filter screens, which seriously affects the operating efficiency and maintenance convenience of the sewage suction truck.

[0004] Meanwhile, the overflow height of traditional anti-overflow valves is fixed and cannot be adjusted. However, sewage suction trucks encounter different road conditions in actual operation, such as bumpy rural dirt roads, sharp turns in mountainous areas, and flat urban roads. The overflow height requirements of the anti-overflow valve are different under different road conditions. If the overflow height is too low, the utilization rate of the tank will be low. If the overflow height is too high, sewage will easily overflow. In other words, the existing anti-overflow valves cannot meet the personalized overflow height requirements of users in different operating scenarios, which brings many limitations to actual use. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention proposes a quick-opening anti-overflow valve for filter screens. This invention achieves quick assembly and disassembly of the filter screen cylinder through the cooperation of the top cover, L-shaped lock, and first spring, while avoiding the problem of inconvenient disassembly caused by easy corrosion of bolt connections, saving maintenance time and improving the operating efficiency of the vacuum truck. The setting of the limit sleeve and limit ring ensures the stability of component operation and ensures smooth filtration and gas flow.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: A filter quick-opening anti-overflow valve of this invention includes an outer shell and a first spacer ring inside the outer shell; an air intake connector is provided in the space above the first spacer ring, communicating laterally; a flow pipe is fixedly connected to the inner edge of the first spacer ring facing downwards; four limiting rods are fixedly connected to the first spacer ring facing downwards around the flow pipe; an anti-detachment ring is fixedly connected to the lower end of the four limiting rods; floats are provided inside the four limiting rods; a filter cylinder is inverted on the upper surface of the first spacer ring; the outer shell... A second sealing ring is fixedly connected to the outer surface of the upper end of the body; the second sealing ring is movably and sealingly connected to the first sealing ring; the upper surface of the first sealing ring is fixedly connected to the top cover; a first spring abuts between the lower surface of the top cover and the upper surface of the filter cylinder; the outer diameter of the top cover is larger than the outer diameter of the first sealing ring; the top cover has multiple arc-shaped grooves running through it vertically around the center of the top cover; one end of each arc-shaped groove has an enlarged hole running through it vertically; an L-shaped lock is fixedly connected to the upper outer wall of the outer shell; the upper end of the L-shaped lock has an expansion portion adapted to the inner diameter of the enlarged hole.

[0007] Preferably, a limiting sleeve fixedly connected to the filter cylinder is sleeved on the outer side of the first spring; limiting rings are fixedly connected to the upper and lower positions of the arc-shaped outer wall of the filter cylinder; the outer diameter of the limiting ring is adapted to the inner diameter of the sleeve-shaped outer shell.

[0008] Preferably, a recessed groove is provided at the upper position of the other end of the arc-shaped groove; the expansion part of the upper end of the L-shaped lock can be inserted into the recessed groove.

[0009] Preferably, a second spacer ring is fixedly connected to the inner side of the outer casing; the second spacer ring is located directly below the first spacer ring; the inner diameter of the second spacer ring is larger than the inner diameter of the first spacer ring; the first spacer ring and the second spacer ring are in sealing contact.

[0010] Preferably, the inner sleeve is movably and sealingly connected to the inner side of the flow tube; the lower end of the inner sleeve is in sealing contact with the float; the inner sleeve is composed of multiple spaced fixed strips and movable strips surrounding each other; the upper inner side of the multiple fixed strips is jointly fixedly connected to a fixed ring; the top of the multiple movable strips is jointly fixedly connected to a movable ring; the lower surface of the movable ring is connected to the top of the fixed strips by a second spring; and an insertion block is provided on the inner wall of the flow tube above the inner sleeve.

[0011] Preferably, the top of the fixing strip is provided with a clearance hole corresponding to the second spring; the second spring is connected between the lower surface of the moving link and the bottom of the clearance hole.

[0012] Preferably, the inner wall of the flow tube is provided with insertion holes spaced apart along the axial direction; the insertion block can be inserted into the insertion holes.

[0013] Preferably, the insertion hole is a blind hole; the inner wall of the insertion hole is provided with an annular locking groove; the insertion block and the insertion hole are cylindrical in shape; the insertion block is provided with a U-shaped groove communicating with the arc-shaped outer wall; a U-shaped block is slidably connected in the U-shaped groove; the U-shaped block and the inner wall of the U-shaped groove are connected by a third spring; and multiple U-shaped grooves are evenly distributed around the central axis of the insertion block.

[0014] Preferably, an anti-blocking block is movably connected to the inner wall of the socket; the anti-blocking block is connected to the bottom of the socket via a fourth spring.

[0015] Preferably, the inner wall of the flow tube is provided with a corrugated guide groove along the axial direction; a guide block fixedly connected to the fixing strip is movably connected in the guide groove.

[0016] The beneficial effects of this invention are as follows: 1. This invention achieves quick assembly and disassembly of the filter cylinder through the cooperation of the top cover, L-shaped lock, and first spring, while avoiding the problem of inconvenient disassembly caused by easy corrosion of bolt connections, saving maintenance time and improving the operating efficiency of the vacuum truck; the setting of the limit sleeve and limit ring ensures the stability of component operation and ensures smooth filtration and gas flow.

[0017] 2. This invention achieves double locking of the top cover through the cooperation of the arc-shaped groove sinking groove and the L-shaped lock expansion part; it avoids the top cover from accidentally rotating and unlocking due to bumps during transportation of sewage suction trucks; it ensures sealing stability and improves the operational reliability of the anti-overflow valve.

[0018] 3. This invention achieves the switching between the rough and smooth surfaces of the lower end of the inner sleeve by cooperating with the inner sleeve, the fixed strip, the movable strip and the second spring, combined with the avoidance function of the avoidance hole; it can clean impurities on the surface of the float ball by scraping and concentrated suction, and also ensure the sealing effect between the float ball and the inner sleeve, avoid impurities affecting the seal, and improve the overflow prevention reliability of the anti-overflow valve.

[0019] 4. This invention achieves adjustable anti-overflow height through the cooperation of the socket and the plug, adapting to different media, working conditions and modification and maintenance needs, avoiding volume waste and liquid overflow; the cooperation of the U-shaped block, the third spring and the locking groove ensures that the plug is locked firmly, and the cooperation of the anti-blocking block and the fourth spring prevents the socket from being blocked, improving the device's adjustment convenience and operational stability. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a perspective view of the present invention; Figure 2 yes Figure 1 A stereoscopic view from another angle; Figure 3 This is a cross-sectional view of the present invention; Figure 4 yes Figure 3 Enlarged view of point A in the middle; Figure 5 yes Figure 3 Enlarged view of point B in the middle; Figure 6 This is a structural diagram of the internal parts of the outer shell in this invention; Figure 7 This is a perspective view of the flow tube and inner sleeve in this invention; Figure 8 This is a three-dimensional view of the inner sleeve in this invention.

[0022] In the diagram: outer shell 1, intake connector 11, second sealing ring 12, L-shaped lock 13, expansion part 131, first spacer ring 2, limiting rod 22, anti-detachment ring 23, float ball 24, filter cylinder 25, limiting sleeve 26, limiting ring 27, second spacer ring 28, top cover 3, first sealing ring 31, first spring 32, arc groove 33, enlarged hole 34, sinking groove 35, flow pipe 4, insertion hole 41, lock groove 42, anti-blocking block 43, fourth spring 44, guide groove 45, guide block 46, inner sleeve 5, fixing strip 51, movable strip 52, fixed connecting ring 53, moving connecting ring 54, second spring 55, clearance hole 56, insertion block 6, U-shaped groove 61, U-shaped block 62, third spring 63. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0024] like Figures 1 to 8 As shown, the present invention includes the following embodiments: Example 1: A quick-opening anti-overflow valve with a filter screen includes a housing 1 and a first spacer ring 2 inside the housing 1; an air intake connector 11 is provided in the space above the first spacer ring 2, which is laterally connected to the outer housing 1; a flow pipe 4 is fixedly connected to the inner edge of the first spacer ring 2 facing downwards; four limiting rods 22 surrounding the flow pipe 4 are fixedly connected to the first spacer ring 2 facing downwards; an anti-detachment ring 23 is fixedly connected to the lower end of the four limiting rods 22; a float ball 24 is provided inside the four limiting rods 22; a filter screen cylinder 25 is sealed and inverted on the upper surface of the first spacer ring 2; a second sealing ring is fixedly connected to the outer surface of the upper end of the housing 1. A sealing ring 12; the second sealing ring 12 is movably and sealingly connected to the first sealing ring 31; the top cover 3 is fixedly connected to the upper surface of the first sealing ring 31; the lower surface of the top cover 3 and the upper surface of the filter cylinder 25 are connected to a first spring 32; the outer diameter of the top cover 3 is larger than the outer diameter of the first sealing ring 31; the top cover 3 is provided with a plurality of arc-shaped grooves 33 around the center of the top cover 3 through the top and bottom; one end of the arc-shaped groove 33 is provided with an enlarged hole 34 through the top and bottom; the outer shell 1 is fixedly connected to an L-shaped lock 13 near the upper outer wall; the upper end of the L-shaped lock 13 is provided with an expansion part 131 adapted to the inner diameter of the enlarged hole 34.

[0025] In this embodiment, a limiting sleeve 26 fixedly connected to the filter cylinder 25 is sleeved on the outside of the first spring 32; a limiting ring 27 is fixedly connected to the upper and lower positions of the arc-shaped outer wall of the filter cylinder 25; the outer diameter of the limiting ring 27 is adapted to the inner diameter of the sleeve-shaped outer shell 1.

[0026] First, install the overflow valve in place. Specifically, weld the lower end of the outer shell 1 to the opening of the tank of the vacuum truck. At the same time, connect the suction connector 11 to the corresponding suction pump via a flange connection, ensuring that the entire device is securely installed and well-sealed, laying the foundation for subsequent operations. After installation, start the suction pump. The suction pump will start working and extract the gas from the tank. At this time, the gas in the tank will flow upward along the flow pipe 4, pass through the inner area of ​​the first partition ring 2, and then pass from the inside out through the filter screen 25 inverted on the upper surface of the first partition ring 2. When the gas passes through the filter screen 25, the filter screen 25 will filter out impurities such as plastic particles, branches, and stones mixed in with the gas, preventing impurities from entering subsequent components. The filtered gas... The gas continues to flow along the gap between the outer surface of the filter cylinder 25 and the outer shell 1, eventually entering the suction pump through the suction connector 11. The suction pump then discharges the gas. As the gas is continuously discharged, a negative pressure environment gradually forms inside the tank. Under the action of negative pressure, external sewage is sucked into the tank along the suction pipe, realizing the sewage suction operation of the sewage suction truck. During the continuous sewage suction operation, the sewage level inside the tank gradually rises. When the liquid level rises, it comes into contact with the float 24 set inside the four limiting rods 22. Since the float 24 is limited by the four limiting rods 22, and the anti-detachment ring 23 at the lower end of the limiting rods 22 supports the float 24, the float 24 will not fall off and will rise synchronously with the liquid level. When the liquid level rises to the preset overflow height, the float 24 will precisely press against the lower end of the flow pipe 4 to seal it, thereby blocking the flow of gas and preventing the sewage in the tank from continuing to rise and enter the suction pump, thus providing effective overflow protection and avoiding equipment damage. With prolonged operation of the vacuum truck, a large amount of filtered debris will adhere to the surface of the filter screen 25. At this time, the filter screen 25 needs to be cleaned or replaced. Specifically, the operator holds the top cover 3, which has anti-slip textures on its outer edge to increase the friction between the hand and the top cover 3, making it easier for the operator to rotate the top cover 3. When rotating the top cover 3, the top cover 3 will drive the first sealing ring 31 fixed below it to rotate synchronously. The multiple arc-shaped grooves 33 on the top cover 3 will also rotate, causing the expansion portion 131 at the upper end of the L-shaped lock 13 fixed to the outer shell 1 to slowly move from one end of the arc-shaped groove 33 to the position of the enlarged hole 34 at the other end of the arc-shaped groove 33. When the expansion portion 131 has completely moved to the position directly below the enlarged hole 34, the hand holding the top cover 3 is released. At this time, the first spring 32, which is in a compressed state, will reset. During the reset process, an upward thrust will be generated, pushing the top cover 3 to move upward. When the top cover 3 moves upward, the expansion portion 131 at the upper end of the L-shaped lock 13 will pass through the enlarged hole 34. As the upward movement of the top cover 3 increases, the expansion portion 131 will completely disengage from the enlarged hole 34, and the top cover 3 will no longer be limited by the L-shaped lock 13.As the top cover 3 continues to move upward, it will cause the first sealing ring 31 to gradually move out from the outer surface of the second sealing ring 12 at the upper end of the outer shell 1. At this time, the filter screen 25, which is inverted inside the outer shell 1, will be fully exposed to the operator's view. The operator only needs to remove the filter screen 25 and the first spring 32, which is sleeved on the outside of the filter screen 25, from the outer shell 1 to complete the disassembly of the filter screen 25. Then, the filter screen 25 can be cleaned or replaced with a new filter screen 25. After cleaning or replacement, the first spring 32 is placed back into the limiting sleeve 26 on the outside of the filter screen 25, and then the filter screen 25 is inverted and placed on the first spacer ring. 2. On the upper surface, ensure the filter cylinder 25 is installed in place. Then, manually control the top cover 3 to move downwards. During the movement, it is necessary to align the position so that the enlarged hole 34 on the top cover 3 is precisely aligned with the expansion part 131 at the upper end of the L-shaped lock 13. As the top cover 3 continues to move downwards, the first sealing ring 31 will gradually fit over the outside of the second sealing ring 12 to achieve a seal. When the top cover 3 moves to the appropriate position, the expansion part 131 at the upper end of the L-shaped lock 13 will pass through the enlarged hole 34 on the top cover 3. After the expansion part 131 has completely passed through the enlarged hole 34, the operator rotates the top cover 3 in the opposite direction, causing the arc groove 33 to rotate in the opposite direction, so that the L-shaped lock 13... The expansion portion 131 moves away from the position of the expansion hole 34 and to the other end of the arc groove 33; then the top cover 3 is released, the first spring 32 returns to its original position and pushes the top cover 3 slightly upward. Since the outer diameter of the expansion portion 131 of the L-shaped lock 13 is larger than the width of the arc groove 33, the expansion portion 131 will be limited to the other end of the arc groove 33, thereby achieving a firm lock on the top cover 3; at this time, although the top cover 3 is slightly lifted, the first sealing ring 31 still maintains a tight movable sealing connection with the second sealing ring 12, which can effectively ensure the sealing between the top cover 3 and the upper port of the outer shell 1, prevent gas leakage, and ensure that the anti-overflow valve can function properly. It is frequently used in subsequent operations; among them, the limiting sleeve 26 on the outside of the filter cylinder 25 can play a good guiding and limiting role for the first spring 32, which facilitates the placement and reset of the first spring 32. The limiting rings 27 at the upper and lower ends of the arc-shaped outer wall of the filter cylinder 25 have an outer diameter that is adapted to the inner diameter of the outer shell 1, which can play a precise positioning and limiting role for the filter cylinder 25 in the outer shell 1, so that a reasonable gap is formed between the outer surface of the filter cylinder 25 and the inner surface of the outer shell 1, which does not affect the smooth flow of gas, and can also ensure the filtration effect of the filter cylinder 25, and prevent the filter cylinder 25 from shifting and affecting the overall operational stability of the device; This embodiment achieves quick assembly and disassembly of the filter cylinder 25 through the cooperation of the top cover 3, L-shaped lock 13, and first spring 32, while avoiding the problem of inconvenient disassembly caused by easy corrosion of bolt connections, saving maintenance time and improving the operating efficiency of the vacuum truck; the setting of the limit sleeve 26 and the limit ring 27 ensures the stability of component operation and ensures smooth filtration and gas flow.

[0027] Example 2: A recessed groove 35 is provided at the upper position of the other end of the arc-shaped groove 33; the expansion part 131 at the upper end of the L-shaped lock 13 can be inserted into the recessed groove 35.

[0028] After the filter cartridge 25 is installed, the top cover 3 is pressed down and the expansion part 131 of the L-shaped lock 13 passes through the expansion hole 34 on the top cover 3, the top cover 3 is rotated in the opposite direction, causing the arc groove 33 to rotate, so that the expansion part 131 at the upper end of the L-shaped lock 13 moves to the other end of the arc groove 33 (the upper end of which is provided with a sinking groove 35). At this time, the expansion part 131 and the sinking groove 35 are precisely aligned. The top cover 3 is released, the first spring 32 returns to its original position and pushes the top cover 3 slightly away from the outer shell 1. The expansion part 131 of the L-shaped lock 13 will be locked into the sinking groove 35, further locking the top cover 3 and preventing the top cover 3 from rotating at will. When it is necessary to disassemble the filter cartridge 25, the top cover 3 is pressed down first, so that the top cover 3 is close to the outer shell 1. The first sealing ring 31 and the second sealing ring 12 maintain a movable seal, and at the same time, the L-shaped lock 13 is closed. The expansion part 131 of the lock 13 disengages from the recessed groove 35, releasing the lock. Then, the top cover 3 is rotated, causing the arc-shaped groove 33 to move, so that the expansion part 131 moves from the recessed groove 35 to the expansion hole 34. The top cover 3 is released, and the first spring 32 pushes the top cover 3 out, so that the expansion part 131 of the L-shaped lock 13 disengages from the expansion hole 34, and the filter screen 25 can be disassembled normally. After the filter screen 25 is cleaned or replaced, it is reinstalled and the top cover 3 is pressed down so that the expansion hole 34 is aligned with the expansion part 131 of the L-shaped lock 13. After the expansion part 131 passes through the expansion hole 34, the top cover 3 is rotated in the opposite direction so that the expansion part 131 moves to the recessed groove 35. The top cover 3 is released, and the first spring 32 pushes the top cover 3 upward, so that the expansion part 131 is inserted into the recessed groove 35, achieving a firm lock again, ensuring that the top cover 3 cannot be unlocked accidentally. In this embodiment, the top cover 3 is double-locked by the cooperation of the arc-shaped groove 33, the recessed groove 35 and the expansion part 131 of the L-shaped lock 13; this prevents the top cover 3 from being accidentally rotated and unlocked due to bumps during transportation of the sewage suction truck; it ensures sealing stability and improves the operational reliability of the anti-overflow valve.

[0029] Example 3: A second spacer ring 28 is fixedly connected to the inner side of the outer shell 1; the second spacer ring 28 is located directly below the first spacer ring 2; the inner diameter of the second spacer ring 28 is larger than the inner diameter of the first spacer ring 2; the first spacer ring 2 and the second spacer ring 28 are in sealed contact.

[0030] A second spacer ring 28 is fixedly connected to the inner side of the outer casing 1. The second spacer ring 28 is located directly below the first spacer ring 2, and the inner diameter of the second spacer ring 28 is larger than that of the first spacer ring 2. During installation, the first spacer ring 2 seals against the upper surface of the second spacer ring 28 to achieve a sealed contact between the two. In the normal assembly state of the device, the first spring 32 on the lower surface of the top cover 3 abuts against the upper surface of the inverted filter screen cylinder 25. The elastic force of the first spring 32 is transmitted to the first spacer ring 2 through the filter screen cylinder 25, pressing the first spacer ring 2 tightly against the second spacer ring 28 to achieve a stable assembly. When it is necessary to clean or replace the float 24, or to maintain the limit rod 22 and the anti-detachment ring 23, first disassemble the top cover 3 and remove the filter screen cylinder 25 according to the aforementioned steps. After the filter screen cylinder 25 is removed, the first spacer ring 2 loses the pressure support of the filter screen cylinder 25. At this time, the first spacer ring can be directly removed. 2. Remove from the inside of the outer casing 1; Since the flow pipe 4 and the four limiting rods 22 are all fixedly connected to the first spacer ring 2, the anti-detachment ring 23 is fixedly connected to the lower end of the limiting rod 22, and the float 24 is located inside the limiting rod 22, when the first spacer ring 2 is removed, the flow pipe 4, the limiting rod 22, the anti-detachment ring 23 and the float 24 will be removed from the outer casing 1 together. The operator can clean and replace the removed float 24, and inspect and maintain the limiting rod 22 and the anti-detachment ring 23. After completion, the first spacer ring 2 is placed back on the upper surface of the second spacer ring 28 to ensure that the two are in sealed contact. Then, the filter screen cylinder 25 is inverted on the first spacer ring 2, and the top cover 3 is installed and locked in sequence, so that the first spring 32 transmits the elastic force to the filter screen cylinder 25 and the first spacer ring 2 again, ensuring that the first spacer ring 2 is pressed and fixed, and the device can resume normal operation. In this embodiment, the sealing fit between the second spacer 28 and the first spacer 2, and the elastic compression of the first spring 32, enable the detachable assembly of the first spacer 2. This facilitates the simultaneous removal of components such as the first spacer 2, the limiting rod 22, and the float 24, making it easier to clean and replace the float 24 and maintain related components, thereby improving the overall ease of maintenance of the device and reducing maintenance costs.

[0031] Example 4: The inner sleeve 5 is movably and sealed to the inside of the flow tube 4; the lower end of the inner sleeve 5 is in sealed contact with the float 24; the inner sleeve 5 is composed of multiple spaced fixed strips 51 and movable strips 52 surrounding each other; the upper inner side of the multiple fixed strips 51 is fixedly connected to a fixed ring 53; the top of the multiple movable strips 52 is fixedly connected to a movable ring 54; the lower surface of the movable ring 54 is connected to the top of the fixed strips 51 by a second spring 55; an insertion block 6 is provided on the inner wall of the flow tube 4 above the inner sleeve 5.

[0032] In this embodiment, the top of the fixing strip 51 is provided with a clearance hole 56 corresponding to the second spring 55; the second spring 55 is connected between the lower surface of the moving link 54 and the bottom of the clearance hole 56.

[0033] The inner sleeve 5 is movably sealed to the inside of the flow pipe 4. The inner sleeve 5 is made of lightweight material and is composed of multiple spaced fixed strips 51 and movable strips 52 arranged around it. The fixed strips 51 and movable strips 52 are in movably sealed contact. The top of the fixed strip 51 has a clearance hole 56 corresponding to the second spring 55. The second spring 55 is connected between the lower surface of the moving link 54 and the bottom of the clearance hole 56, so as to achieve proper assembly and clearance of the second spring 55. Note that the second spring 55 is connected to the moving link 54. 4. And the bottom of the clearance hole 56 is fixedly connected; in the initial state, the lower end of the movable strip 52 is higher than the lower end of the fixed strip 51, making the lower port of the inner sleeve 5 rough. At this time, the lower port of the inner sleeve 5 cannot form a seal when it comes into contact with the float 24; multiple fixed strips 51 are fixedly connected to the upper inner side with a fixed ring 53, and multiple movable strips 52 are fixedly connected to the top with a moving ring 54. The inner wall of the flow pipe 4 and above the inner sleeve 5 is provided with an insert block 6, which plays a limiting role for the moving ring 54; during the sewage suction operation, the tank body As the sewage level gradually rises, the float 24 moves upward in sync. During this upward movement, the float 24 contacts the lower end of the inner sleeve 5. Because the inner sleeve 5 is made of lightweight material, the float 24 causes the inner sleeve 5 to move upward along the inner side of the flow pipe 4. When the inner sleeve 5 reaches a certain position, the moving link 54 is blocked by the insert block 6 on the inner wall of the flow pipe 4 and cannot continue to move upward. As the float 24 continues to move upward, it exerts an upward squeezing force on the fixing strip 51, pushing the fixing strip 51 upward. During this upward movement, the fixing strip 51 is squeezed... The second spring 55 gradually contracts and enters the clearance hole 56 at the top of the fixed strip 51. The clearance hole 56 effectively avoids the second spring 55. Since the fixed strip 51 and the movable strip 52 are of equal length, as the fixed strip 51 moves upward, the fixed strip 51 and the movable strip 52 move in a relatively vertical direction until the lower end of the fixed strip 51 is flush with the lower end of the movable strip 52. At this time, the rough surface of the lower end of the inner sleeve 5 becomes a smooth surface, achieving a tight sealing contact with the float 24. As the inner sleeve 5 moves upward, the float 24 will sway under the action of the liquid surface swaying. During the swaying process, the float 24 will scrape against the rough surface (when not flush) of the lower end of the inner sleeve 5, making it easier for impurities attached to the surface of the float 24 to fall off. At the same time, when the float 24 presses against the lower end of the inner sleeve 5, the gap between the two becomes smaller, the suction force is concentrated and increased, further sucking away the impurities on the surface of the float 24. The fallen impurities are finally intercepted by the filter screen 25 and confined inside the filter screen 25. When sewage is discharged from the tank, the liquid level gradually drops, and the float 24 moves downward accordingly. After the float 24 moves downward, the suction pump draws outside gas into the inside of the outer shell 1 through the suction connector 11. The gas passes through the filter screen 25 from the outside to the inside, and then flows downward along the flow pipe 4 and the inner sleeve 5, pushing the float 24 further apart and assisting the float 24 to move downward. The downward movement of the float 24 drives the inner sleeve 5 to move downward synchronously. When the inner sleeve 5 moves to a certain position, the moving link 54 disengages from the insert block 6 on the inner wall of the flow pipe 4 and releases the limit. At this time, the second spring 55 resets and pushes the fixed link 53 and the fixing bar 51 away from the moving link 54, so that the fixing bar 51 and the moving bar 52 are misaligned again. The lower end of the fixing bar 51 is lower than the lower end of the moving bar 52 again, and the lower end of the inner sleeve 5 returns to the rough state, waiting for the next anti-overflow operation. In this embodiment, the inner sleeve 5, the fixed strip 51, the movable strip 52 and the second spring 55 work together, combined with the avoidance function of the avoidance hole 56, to achieve the switching between the rough surface and the smooth surface of the lower end of the inner sleeve 5; it can clean the impurities on the surface of the float 24 by scraping and concentrated suction, and also ensure the sealing effect between the float 24 and the inner sleeve 5, avoid impurities affecting the seal, and improve the overflow prevention reliability of the anti-overflow valve.

[0034] Example 5: The inner wall of the flow tube 4 is provided with insertion holes 41 at intervals along the axial direction; the insertion block 6 can be inserted into the insertion holes 41.

[0035] In this embodiment, the insertion hole 41 is a blind hole; the inner wall of the insertion hole 41 is provided with an annular locking groove 42; the insertion block 6 and the insertion hole 41 are cylindrical in shape; the insertion block 6 is provided with a U-shaped groove 61 that communicates with the arc-shaped outer wall; a U-shaped block 62 is slidably connected in the U-shaped groove 61; the U-shaped block 62 and the inner wall of the U-shaped groove 61 are connected by a third spring 63; a plurality of U-shaped grooves 61 are evenly distributed around the central axis of the insertion block 6.

[0036] In this embodiment, an anti-blocking block 43 is movably connected to the inner wall of the insertion hole 41; the anti-blocking block 43 is connected to the bottom of the insertion hole 41 by a fourth spring 44; the outer diameter of the anti-blocking block 43 is adapted to the inner diameter of the insertion hole 41, and the two can be movably and sealed together; the insertion hole 41 can be extended to the outside to balance the internal and external pressures; a limiting pull rope can be connected between the anti-blocking block 43 and the inner bottom wall of the insertion hole 41 (to prevent the anti-blocking block 43 from coming out), so as to ensure that the anti-blocking block 43 is flush with the inner wall of the flow tube 4 under the elastic force of the fourth spring 44 to form a complete inner wall.

[0037] The overflow prevention height is equal to the liquid level at which float 24 triggers the closure. Firstly, the same vehicle may carry different media: water, sewage, diesel, and chemical fluids; these have different densities, foam levels, and safety margins. Adjusting the height allows for slower loading, while lowering it provides more safety space and prevents sloshing and overflow. Without adjustment, either volume is wasted or overflow is likely. Secondly, under different operating conditions and road conditions, such as plains / mountains, highways / rough roads, long / short distances, if there is significant bumpiness or steep inclines, the overflow prevention height must be lowered to prevent liquid from sloshing up and pushing open float 24, causing accidental closure or overflow. Finally, during modifications, repairs, tank replacements, and pipeline replacements... In cases where the tank is modified, the pipe height changes, the old valve is replaced with a new one, or the height of the return pipe is changed, the height must be adjustable to match the new dimensions. Therefore, it is necessary to adjust the overflow height. Specifically, the overflow height is adjustable by adjusting the position of the insert 6. When adjusting the overflow height, the axial position of the insert 6 on the inner wall of the flow pipe 4 must be adjusted first, thereby changing the limit height of the inner sleeve 5 after it moves upward. Finally, the trigger height of the lower port of the inner sleeve 5 changes from a rough state to a smooth state. Since the lower port of the inner sleeve 5 will seal with the float 24 after it becomes a smooth surface, the height at which the float 24 triggers the seal, i.e., the overflow height of the overflow valve, will change accordingly. When installing the insert 6, first press the U-shaped block 62 to overcome the elastic force of the third spring 63, causing the U-shaped block 62 to move towards the bottom of the U-shaped groove 61 until the end of the U-shaped block 62 is completely submerged in the U-shaped groove 61. Then, align the insert 6 with the preset position of the insertion hole 41 on the inner wall of the flow tube 4, and push the insert 6 into the insertion hole 41. During the insertion process, the insert 6 will squeeze the anti-blocking block 43 in the insertion hole 41, causing the anti-blocking block 43 to overcome the elastic force of the fourth spring 44 and move towards the bottom of the insertion hole 41, completely entering the inner side of the insertion hole 41. After the insert 6 is inserted in place, release the pressure on the U-shaped block 62, the third spring 63 will return to its original position, and push the U-shaped block 62 away from the bottom of the U-shaped groove 61, causing the U-shaped block 62 to protrude from the opening of the U-shaped groove 61. The end of the U-shaped block 62 located in the insertion hole 41 will be locked into the annular locking groove 42 on the inner wall of the insertion hole 41, thus achieving a firm lock on the insert 6. To prevent the plug 6 from accidentally falling off; when it is necessary to adjust the anti-overflow height or change the insertion position of the plug 6, press the end of the U-shaped block 62 located outside the socket 41 to overcome the elastic force of the third spring 63, so that the U-shaped block 62 moves towards the bottom of the U-shaped groove 61. At this time, the end of the U-shaped block 62 located in the socket 41 will move out of the locking groove 42 and re-submerge into the U-shaped groove 61, releasing the lock on the plug 6; after the lock is released, directly pull the plug 6 out of the socket 41. During the pulling process, the fourth spring 44 resets and pushes the anti-blocking block 43 to move towards the port of the socket 41. Finally, the anti-blocking block 43 blocks the port of the socket 41, realizing the anti-blocking of the socket 41 and preventing impurities from entering the socket 41 and affecting the subsequent installation of the plug 6; then insert the plug 6 into the socket 41 at other axial positions on the inner wall of the flow tube 4, and repeat the above installation and locking steps to complete the adjustment of the anti-overflow height; In this embodiment, there are multiple U-shaped blocks 62 inside the insert block 6, and the multiple U-shaped blocks 62 are evenly distributed around the center of the insert block 6; the insert block 6 can only be unlocked when multiple U-shaped blocks 62 are pressed at the same time. In this embodiment, the anti-overflow height is adjustable through the cooperation of the socket 41 and the plug 6, which can adapt to different media, working conditions and modification and maintenance needs, and avoid volume waste and liquid overflow. The cooperation of the U-shaped block 62, the third spring 63 and the locking groove 42 ensures that the plug 6 is locked firmly, and the cooperation of the anti-blocking block 43 and the fourth spring 44 prevents the socket 41 from being blocked, thereby improving the device's adjustment convenience and operational stability.

[0038] Example 6: The inner wall of the flow pipe 4 is provided with a corrugated guide groove 45 along the axial direction; a guide block 46 that is fixedly connected to the fixing strip 51 is movably connected in the guide groove 45.

[0039] During the suction operation, the sewage level in the tank rises, and the float 24 moves upward synchronously, causing the lightweight inner sleeve 5 to move upward along the inner side of the flow pipe 4. As the inner sleeve 5 moves upward, it causes the fixing strip 51, which is fixed to it, to move upward synchronously. During the upward movement of the fixing strip 51, it causes the guide block 46, which is fixed to it, to move together. Because the guide groove 45 has a corrugated structure, the guide block 46, under the limiting guidance of the corrugated guide groove 45, moves axially along the guide groove 45 while simultaneously generating a back-and-forth undulating and rotating motion. The undulating rotation of the guide block 46 causes the fixing strip 51 to move synchronously, thereby causing the entire inner sleeve 5 to undulate and rotate axially. During the back-and-forth rotation of the inner sleeve 5, the rough surface of its lower end scrapes the float 24 in contact with it. This... Compared to scraping in one direction, the scraping action can more comprehensively act on the surface of the float 24, improving the scraping and cleaning effect on impurities and debris on the surface of the float 24, making it easier for debris attached to the surface of the float 24 to fall off. The fallen debris will be sucked away from the surface of the float 24 under the action of negative pressure suction, and finally intercepted by the filter screen 25 and confined inside the filter screen 25. When sewage is discharged from the tank and the liquid level drops, the float 24 moves down under its own weight and the action of the drop in liquid level. At the same time, the inner sleeve 5 will also move down synchronously under the action of gravity. When the inner sleeve 5 moves down, it will drive the guide block 46 to move downward along the corrugated guide groove 45. Under the guidance of the guide groove 45, it achieves precise reset, the inner sleeve 5 stops fluctuating and rotating, returns to the initial state, and waits for the next anti-overflow operation. In this embodiment, the corrugated guide groove 45 and the guide block 46 work together to drive the inner sleeve 5 to oscillate and rotate back and forth in the axial direction; this enhances the scraping effect of the rough surface of the lower end of the inner sleeve 5 on the float 24, making it easier to remove debris from the surface of the float 24, ensuring the tightness of the subsequent seal between the float 24 and the inner sleeve 5, and further improving the anti-overflow reliability of the anti-overflow valve.

[0040] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first," "second," "third," etc. are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, "fixed connection" refers to a fixed connection. In the description of the present invention, "sliding connection" refers to a connection where the two parts can only slide and cannot be separated. Specifically, the groove can be set to be concave and the block can be set to be convex, and the specific design can be adjusted according to the actual situation. "Sliding fit" refers to a connection where the two parts can slide and separate. In the description of the present invention, "rotational connection" refers to a connection where the two parts can only rotate and cannot produce axial displacement. Specifically, an annular groove can be provided on the inner wall of the hole, and a ring that is rotatably connected to the groove can be fixed to the outer wall of the shaft.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quick-opening anti-overflow valve with a filter screen, comprising a housing and a first spacer ring on the inner side of the housing; an air intake connector is laterally connected to the space above the first spacer ring; a flow pipe is fixedly connected downwards to the inner edge of the first spacer ring; four limiting rods are fixedly connected downwards to the first spacer ring around the flow pipe; an anti-detachment ring is fixedly connected to the lower end of the four limiting rods; floats are provided inside the four limiting rods; characterized in that: The filter cylinder is inverted on the upper surface of the first spacer ring; a second sealing ring is fixedly connected to the upper outer surface of the outer shell; the second sealing ring is movably and sealingly connected to the first sealing ring; a top cover is fixedly connected to the upper surface of the first sealing ring; a first spring abuts between the lower surface of the top cover and the upper surface of the filter cylinder; the outer diameter of the top cover is larger than the outer diameter of the first sealing ring; multiple arc-shaped grooves are provided vertically through the top cover around the center of the top cover; an enlarged hole is provided vertically through one end of each arc-shaped groove; an L-shaped lock is fixedly connected to the upper outer wall of the outer shell; an expansion portion adapted to the inner diameter of the enlarged hole is provided at the upper end of the L-shaped lock.

2. The quick-opening anti-overflow valve with filter screen according to claim 1, characterized in that: A limiting sleeve fixedly connected to the filter cylinder is sleeved on the outside of the first spring; limiting rings are fixedly connected to the upper and lower positions of the arc-shaped outer wall of the filter cylinder; the outer diameter of the limiting ring is adapted to the inner diameter of the sleeve-shaped outer shell.

3. The quick-opening anti-overflow valve with filter screen according to claim 1, characterized in that: A recessed groove is provided at the upper position of the other end of the arc-shaped groove; the expansion part of the upper end of the L-shaped lock can be inserted into the recessed groove.

4. The quick-opening anti-overflow valve with filter screen according to claim 1, characterized in that: A second spacer is fixedly connected to the inner side of the outer casing; the second spacer is located directly below the first spacer; the inner diameter of the second spacer is larger than the inner diameter of the first spacer; the first spacer and the second spacer are in sealing contact.

5. A quick-opening anti-overflow valve with a filter screen according to claim 1, characterized in that: The inner sleeve is movably and sealingly connected to the inner side of the flow tube; the lower end of the inner sleeve is in sealing contact with the float; the inner sleeve is composed of multiple spaced fixed strips and movable strips surrounding it; the upper inner side of the multiple fixed strips is fixedly connected to a fixed ring; the top of the multiple movable strips is fixedly connected to a movable ring; the lower surface of the movable ring is connected to the top of the fixed strips by a second spring; an insertion block is provided on the inner wall of the flow tube above the inner sleeve.

6. A quick-opening anti-overflow valve with a filter screen according to claim 5, characterized in that: The top of the fixing bar is provided with a clearance hole corresponding to the second spring; the second spring is connected between the lower surface of the moving link and the bottom of the clearance hole.

7. A quick-opening anti-overflow valve with a filter screen according to claim 5, characterized in that: The inner wall of the flow tube is provided with insertion holes spaced along the axial direction; the insertion block can be inserted into the insertion holes.

8. A quick-opening anti-overflow valve with a filter screen according to claim 7, characterized in that: The insertion hole is a blind hole; the inner wall of the insertion hole is provided with an annular locking groove; the insertion block and the insertion hole are cylindrical in shape; the insertion block is provided with a U-shaped groove that communicates with the arc-shaped outer wall; a U-shaped block is slidably connected in the U-shaped groove; the U-shaped block and the inner wall of the U-shaped groove are connected by a third spring; multiple U-shaped grooves are evenly distributed around the central axis of the insertion block.

9. A quick-opening anti-overflow valve with a filter screen according to claim 7, characterized in that: An anti-blocking block is movably connected to the inner wall of the socket; the anti-blocking block is connected to the bottom of the socket by a fourth spring.

10. A quick-opening anti-overflow valve with a filter screen according to claim 5, characterized in that: The inner wall of the flow tube is provided with a corrugated guide groove along the axial direction; a guide block that is fixedly connected to the fixed strip is movably connected in the guide groove.

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