Bidirectional sealing sewage special ball valve

Abstract

This invention relates to the field of valve technology, and in particular to a bidirectional sealing ball valve specifically for sewage, comprising a valve body, a ball, a through hole, a valve stem, an outer casing, a worm gear, a worm, and a handwheel. The outer casing has a first horizontal block and a second horizontal block on both sides, with a first adjusting bolt and a second adjusting bolt screwed onto the first and second horizontal blocks respectively. The worm gear has a first cross-section and a second cross-section on both sides, with the included angle between the first and second cross-sections greater than 45 degrees. This invention achieves precise adjustable calibration of the ball's opening and closing position from 0 to 90 degrees through the cooperation of the adjusting bolts and the worm gear cross-sections, compensating for machining and assembly errors and ensuring bidirectional sealing reliability. This invention integrates precise limiting, transmission clearance elimination, ball surface self-cleaning, and inner wall self-driving scraping, effectively solving the problems of valves not closing tightly, easily jamming, and easily scaling under sewage conditions, significantly extending the valve's service life.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a bidirectional sealing ball valve specifically for sewage. Background Technology

[0002] Ball valves, as an important fluid control component, are widely used in sewage treatment, industrial pipelines and other fields. For large-diameter ball valves or those requiring labor-saving operation, a worm gear transmission mechanism is usually installed on the top of the valve body. By rotating the handwheel, the worm is driven to rotate, which in turn drives the valve stem and the ball to rotate 90 degrees within the valve body. This keeps the through hole on the ball in a horizontal open state or a vertical closed state with the flow channel of the valve body, thereby achieving the purpose of cutting off or connecting the water flow.

[0003] Existing ball valve housings typically use fixed transverse grooves for limiting movement, making it impossible to fine-tune or compensate for position after assembly. This results in the initial and final braking positions of the ball rotation, i.e., the open and closed positions, being inconsistent, which can easily lead to problems such as the ball valve not closing tightly and water leakage, resulting in a high scrap rate in production. Summary of the Invention

[0004] Therefore, in view of the above problems, the present invention proposes a bidirectional sealing ball valve for sewage, which solves the above problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A bidirectional sealing ball valve for sewage includes a valve body, a ball inside the valve body, a through hole in the middle of the ball, a valve stem rotatably located on the top of the valve body and connected to the ball, an outer casing on the top of the valve body, a worm gear located on the top of the valve stem and inside the outer casing, a worm rotatably located inside the outer casing and meshing with the worm gear, a handwheel located on the side of the worm away from the outer casing, a first horizontal block and a second horizontal block located on both sides inside the outer casing, a first adjusting bolt screwed into the first horizontal block, and a second adjusting bolt screwed into the second horizontal block. The worm gear has a first cross-section and a second cross-section on both sides, and the included angle between the first cross-section and the second cross-section is greater than 45 degrees.

[0006] Furthermore, a first spring is provided on the outer side of the first adjusting bolt and the second adjusting bolt.

[0007] Furthermore, a scraper is provided inside the valve body on the right side of the ball, and the scraper is arc-shaped.

[0008] Furthermore, an L-shaped angle iron is fixedly provided on one side of the scraper, and a fixing block is provided inside the valve body near the scraper. A third adjusting bolt for passing through the L-shaped angle iron and the fixing block is provided on the fixing block. A nut cover is screwed onto the outside of the third adjusting bolt, and a second spring is provided between the L-shaped angle iron and the nut cover.

[0009] Furthermore, the surface of the arc-shaped scraper is coated with a chromium nitride hard coating, the thickness of which is 0.02mm~0.05mm.

[0010] Furthermore, a connecting pipe assembly is detachably connected to one side of the valve body. The connecting pipe assembly includes a pipe fitting, limiting blocks on both sides of the pipe fitting, a movable frame slidably disposed within the limiting blocks, a rectangular opening in the middle of the movable frame, a rotating shaft in the middle of the pipe fitting, a blade fixed to the outside of the rotating shaft, and a three-pronged cam on the top of the rotating shaft. The movable frame has a first guide block at the rear end of one side of the rectangular opening and a second guide block at the front end of the other side of the rectangular opening. A scraper is slidably disposed on the bottom of the inner wall of the pipe fitting, and connecting rods connected to the movable frame are disposed on the front and rear sides of the scraper.

[0011] By adopting the aforementioned technical solution, the beneficial effects of the present invention are: This bidirectional sealing ball valve for sewage uses a first and second horizontal block, along with first and second adjusting bolts that engage with them. Compared to traditional fixed-limit designs, during assembly or use, the first and second adjusting bolts can be tightened according to the actual horizontal and vertical state of the ball's through hole to align with the first and second cross-sections of the worm gear. This design compensates for errors in the machining and assembly of the worm gear and worm, achieving precise calibration of the opening and closing positions from 0 to 90 degrees. This ensures the reliability of the ball valve's bidirectional sealing and significantly reduces the scrap rate during manufacturing.

[0012] The alternating cooperation between the three-pronged cam and the first and second guide blocks on the moving frame converts the rotational motion of the blades caused by the impact of water flow into a reciprocating linear motion, thereby driving the scraper at the bottom to continuously and automatically clean the inner wall of the valve body and the side edge of the ball. This structure relies on the fluid kinetic energy of the sewage itself and can effectively prevent clogging and scaling without the need for external power. It avoids the accumulation of hard particles, silt and other impurities that may obstruct or wear the sealing surface, protects the bidirectional sealing structure of the ball valve, and extends the service life of the ball valve. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention.

[0014] Figure 2 This is a top view schematic diagram of the valve body structure of the present invention.

[0015] Figure 3 This is a top view of a partial structure of the valve body of the present invention.

[0016] Figure 4 This is a schematic cross-sectional view of the AA structure of the present invention.

[0017] Figure 5This is a schematic plan view of the internal structure of the outer casing of the present invention.

[0018] Figure 6 This is the present invention. Figure 4 A magnified structural diagram at point A in the diagram.

[0019] Figure 7 This is a left-side view of the connecting pipe assembly structure of the present invention.

[0020] Figure 8 This is a front view schematic diagram of the connecting pipe assembly structure of the present invention.

[0021] Figure 9 This is a top view of a partial structure of the connecting pipe assembly of the present invention.

[0022] Figure 10 This is a partial structural diagram of the connecting pipe assembly of the present invention.

[0023] Figure 11 This is a schematic diagram of the extension and third spring in use according to the present invention.

[0024] Figure 12 This is a front view schematic diagram of the extension and third spring of the present invention in use.

[0025] Numbering on the map: 1. Valve body; 2. Ball; 3. Through hole; 4. Valve stem; 5. Outer casing; 6. Worm gear; 7. Worm; 8. Handwheel; 9. First cross block; 10. Second cross block; 11. First adjusting bolt; 12. Second adjusting bolt; 13. First spring; 14. Connecting pipe assembly; 15. Scraper; 16. L-shaped angle iron; 17. Fixing block; 18. Third adjusting bolt; 19. Nut cover; 20. Second spring; 61. First cross-section; 62. Second cross-section; 401. Pipe fitting; 402. Limiting block; 403. Moving frame; 404. Rectangular opening; 405. Rotating shaft; 406. Blade; 407. Trident cam; 408. Blocking part; 409. First guide block; 410. Second guide block; 411. Scraper; 412. Connecting rod; 413. Extension part; 414. Opening; 415. Third spring; Detailed Implementation

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0027] refer to Figures 1 to 12This embodiment provides a bidirectional sealing ball valve for sewage, including a valve body 1, a ball 2 disposed inside the valve body 1, a through hole 3 disposed in the middle of the ball 2, a valve stem 4 rotatably disposed on the top of the valve body 1 and connected to the ball 2, an outer casing 5 disposed on the top of the valve body 1, a worm gear 6 disposed on the top of the valve stem 4 and located inside the outer casing 5, a worm 7 rotatably disposed inside the outer casing 5 and meshing with the worm gear 6, a handwheel 8 disposed on the side of the worm 7 away from the outer casing 5, a first transverse block 9 and a second transverse block 10 disposed on both sides of the transverse side inside the outer casing 5, and a handwheel 8 that rotates with the first transverse block 9. The first adjusting bolt 11 engages with the second adjusting bolt 12, which engages with the second cross block 10. The worm gear 6 has a first cross section 61 and a second cross section 62 on both sides. The included angle between the first cross section 61 and the second cross section 62 is greater than 45 degrees. When the ball 2 is closed, its outer spherical surface simultaneously forms a sealing fit with the valve body 1. When the ball 2 rotates to the point where the through hole 3 is perpendicular to the valve body 1, the outer spherical surface of the ball 2 simultaneously fits tightly against the inner wall of the inflow valve body 1. Regardless of which side the medium applies pressure from, the ball 2 is pressed against the opposite side of the valve body 1, forming a bidirectional seal.

[0028] In operation, rotating the handwheel 8 rotates the worm gear 7, which in turn rotates the valve stem 4 and the ball 2 via the worm wheel 6. The ball 2 rotates 90 degrees inside the valve body 1, adjusting the through hole 3 from being horizontal to vertical, thus keeping the ball valve closed. When the initial and final stopping positions of the worm wheel 6 are not fixed, rotating the worm gear 7 via the handwheel 8 rotates the valve stem 4 and the ball 2. The initial position is when the through hole 3 on the ball 2 is horizontal to the valve body 1. At this point, rotating the first adjusting bolt 11 brings its end into contact with the worm wheel 6. After this, tightening the first adjusting bolt 11 completes the initial position limit. Then, rotating the ball 2 90 degrees, tightening the second adjusting bolt 12 brings its end into contact with the worm wheel 6. By adjusting the first adjusting bolt 11 and the second adjusting bolt 12, the initial and final rotation positions of the worm wheel 6 can be adjusted.

[0029] A first spring 13 is provided on the outer side of the first adjusting bolt 11 and the second adjusting bolt 12. When the worm gear 6 rotates to a position close to the first adjusting bolt 11 or the second adjusting bolt 12, it will contact the first spring 13. The first spring 13 has a certain resistance. When it is close to the final position, the resistance feedback provided by the compression of the first spring 13 provides clear tactile feedback to the operator, reminding them to reduce the rotation force. This not only improves the manual operation experience but also plays a good buffering role, avoiding mechanical damage caused by a sudden rigid impact between the worm gear 6 and the first adjusting bolt 11 and the second adjusting bolt 12, thus extending the service life of the ball valve. Furthermore, the first spring 13 will fit against the first cross-section 61 or the second cross-section 62 of the worm gear 6, and... After the adjusting bolt 11 or the second adjusting bolt 12 contacts, the first spring 13 first contacts the worm wheel 6. The outer tooth surface of the worm wheel 6 will be tightly attached to the worm 7, which will reduce the angular displacement of the ball 2 and the valve stem 4 caused by the gap difference between the worm wheel 6 and the worm 7. Since there is a tooth side clearance between the worm wheel 6 and the worm 7, the ball 2 and the valve stem 4 will undergo a slight angular displacement when impacted by water flow, which will affect the seal. In this invention, after the first spring 13 contacts the worm wheel 6, its elastic force will continue to act on the worm wheel 6, forcing the outer tooth surface of the worm wheel 6 to tightly fit the tooth surface of the worm 7, avoiding the transmission gap between the worm wheel 6 and the worm 7. The ball 2 and the valve stem 4 are stable after rotation, which solves the problem of angular displacement of the ball 2 and the valve stem 4 caused by the gap difference, and ensures that the ball valve maintains a precise sealing state for a long time under complex working conditions such as sewage pipelines.

[0030] Inside the valve body 1, on the right side of the ball 2, is a scraper 15. The scraper 15 is arc-shaped and located on one side of the ball 2. When the ball 2 is rotated, the scale, fibers, or particles attached to the surface of the ball 2 are scraped off by the cutting edge of the scraper 15 and washed away with the water flow. The arc-shaped scraper 15 is adapted to the curvature of the outer spherical surface of the ball 2, ensuring that the cutting edge of the scraper 15 and the surface of the ball 2 remain evenly attached during the scraping process. The scraping area is large and the cleaning effect is good. While effectively removing dirt, it protects the surface smoothness of the ball 2 and extends the sealing life of the ball valve. The arc-shaped scraper 15 does not require an additional external power source. It can complete the real-time cleaning of the surface of the ball 2 by the rotation action of the ball valve itself. The structure is simple and reliable, and does not increase the operating torque. It is particularly suitable for harsh working conditions in sewage pipes with a lot of particulate impurities and easy scaling, which significantly reduces the problem of ball valve jamming caused by dirt accumulation on the surface of the ball 2.

[0031] An L-shaped angle iron 16 is fixed on one side of the scraper 15. A fixing block 17 is provided inside the valve body 1 near the scraper 15. A third adjusting bolt 18 is provided on the fixing block 17 for passing through the L-shaped angle iron 16 and the fixing block 17. A nut cover 19 is screwed on the outside of the third adjusting bolt 18. A second spring 20 is provided between the L-shaped angle iron 16 and the nut cover 19.

[0032] When the clamping force of the scraper 15 needs to be adjusted, rotate the third adjusting bolt 18 and move the nut toward the ball 2, so that the second spring 20 clamps the scraper 15. This allows for adjustment of the clamping force of the scraper 15 on the ball 2. The second spring 20 is designed for elastic buffering. When there is slight non-roundness or local protrusion on the surface of the ball 2, the second spring 20 can absorb the impact and allow the scraper 15 to make slight retraction, preventing the scraper 15 from rigidly jamming with the ball 2 or scratching the sealing surface. This ensures effective scraping and cleaning while protecting the integrity of the ball 2 surface. In addition, through the threaded engagement of the third adjusting bolt 18 and the nut cover 19, the clamping force of the scraper 15 can be steplessly and precisely adjusted. This allows the scraper 15 to adapt to normal wear compensation between the ball 2 and the scraper 15 after long-term operation, and to flexibly set the optimal scraping force according to different media conditions, significantly improving the adaptability and self-cleaning reliability of the ball valve under different sewage conditions.

[0033] The surface of the arc-shaped scraper 15 is coated with a chromium nitride hard coating with a thickness of 0.02mm to 0.05mm. The low surface energy and hydrophobic properties of the chromium nitride hard coating can inhibit the secondary adhesion of sticky dirt in sewage to the surface of the scraper 15, keeping the scraper 15 clean and effective for a long time.

[0034] A connecting pipe assembly 14 is detachably connected to one side of the valve body 1. The connecting pipe assembly 14 includes a pipe fitting 401, limiting blocks 402 located on both sides of the pipe fitting 401, a movable frame 403 slidably located within the limiting blocks 402, a rectangular opening 404 located in the middle of the movable frame 403, a rotating shaft 405 rotatably located in the middle of the pipe fitting 401, a blade 406 fixed to the outside of the rotating shaft 405, and a three-pronged cam 407 located on the top of the rotating shaft 405. A crescent-shaped part is located on the left side of the blade 406 in the pipe fitting 401. The blocking part 408, the moving frame 403 is provided with a first guide block 409 at the rear end of one side of the rectangular opening 404, the moving frame 403 is provided with a second guide block 410 at the front end of the other side of the rectangular opening 404, the scraper 411 is slidably provided on the bottom of the inner wall of the pipe fitting 401, the scraper 411 is provided with connecting rods 412 connected to the moving frame 403 on the front and rear sides, the scraper 411 is crescent-shaped on the left side of the blade 406, and the scraper 411 is arc-shaped on the right side of the blade 406.

[0035] Water flows through the crescent-shaped obstruction 408 inside the fitting 401, then through the blade 406. Half of the blade 406 is continuously impacted by the water flow and rotates. The blade 406 drives the top trident cam 407 to rotate via the shaft 405. During rotation, one front end of the trident cam 407 contacts the second guide block 410 of the moving frame 403, pushing the second guide block 410 and the moving frame 403 to the right. The moving frame 403, via the connecting rod 412, simultaneously drives the bottom scraper 411 to the right. After the moving frame 403 moves to the right, the rear end of the trident cam 407 contacts the first guide block 409 at the rear end of the moving frame 403, pushing the first guide block 409 and the moving frame 403 to the left. The moving frame 403, via the connecting rod 412, drives the bottom scraper 411 to the left. The moving frame 403 and the scraper 411 can extend and be positioned within the valve body 1, located on the ball. 2. On the left side, the inner wall of the ball 2 inside the valve body 1 is scraped. The three-pronged cam 407 at the top of the rotating shaft 405 rotates continuously, alternately pushing the first guide block 409 and the second guide block 410 in front and behind the moving frame 403. This smoothly and accurately converts the unidirectional rotational motion into the left and right reciprocating linear motion of the moving frame 403 and the bottom scraper 411. The three-pronged cam 407 is located at the top, which can prevent sewage sediment from restricting the rotation of the three-pronged cam 407. The reciprocating scraper 411 is located at the bottom and extends to the inside of the valve body 1 and the side of the ball 2. During the entire process of sewage flow, the inner wall of the left side of the valve body 1 and the surrounding area, which are prone to accumulation, are continuously scraped and cleaned. This design prevents the valve body 1 from clogging and sludge from forming, avoids wear and jamming caused by impurities trapped between the ball 2 and the valve body 1, protects the sealing structure of the ball valve, and ensures the sealing reliability of the ball valve.

[0036] The scraper 411 is provided with an extension 413 on the right side of the blade 406. The extension 413 is provided with multiple openings 414 and multiple third springs 415 on its surface. During use, some sediment will sink and accumulate in the openings 414 of the extension 413 and on the surface of the extension 413. When the scraper 411 moves back and forth under the drive of the moving frame 403 and the connecting rod 412, the extension 413 moves with the scraper 411. Its scraping coverage area is significantly increased compared with the case without the extension 413, which can bring a wider range of sediment at the bottom of the valve body 1 into the cleaning area.

[0037] Multiple third springs 415 on the surface of the extension 413 will generate irregular elastic vibrations with the water flow and scraping resistance during the reciprocating movement of the scraper 411. This vibration will exert a continuous high-frequency disturbance on the sediment accumulated on the surface of the extension 413 and in the opening 414, causing the dirt that was originally inclined to harden or settle to be stirred up and formed local turbulent flow. At the same time, the setting of the opening 414 allows the sediment to partially pass through the hole when the scraper 411 moves, which will disrupt the overall continuity of the dirt layer and prevent the sediment from forming dense clumps on the surface of the extension 413. The elastic vibration of the third springs 415 and the flow disturbance of the opening 414 work together to keep the silt, sand and other sediments that have been deposited at the bottom of the valve body 1 in a continuously stirred suspended or semi-suspended state, which is more easily carried away by the water flow. This effectively prevents the hardening of scale in the dead zone at the bottom of the valve body 1, and further ensures that the ball 2 and the valve body 1 are not worn by sediment intrusion, thus extending the reliable service life of the bidirectional sealing structure.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A bidirectional sealing ball valve specifically for sewage, characterized in that, The valve includes a valve body (1), a ball (2) inside the valve body (1), a through hole (3) in the middle of the ball (2), a valve stem (4) rotatably located on the top of the valve body (1) and connected to the ball (2), an outer casing (5) on the top of the valve body (1), a worm gear (6) located on the top of the valve stem (4) and inside the outer casing (5), a worm (7) rotatably located inside the outer casing (5) and meshing with the worm gear (6), a handwheel (8) on the side of the worm (7) away from the outer casing (5), a first horizontal block (9) and a second horizontal block (10) on both sides inside the outer casing (5), a first adjusting bolt (11) screwed with the first horizontal block (9), and a second adjusting bolt (12) screwed with the second horizontal block (10). The worm gear (6) has a first cross-section (61) and a second cross-section (62) on both sides, and the included angle between the first cross-section (61) and the second cross-section (62) is greater than 45 degrees.

2. The bidirectional sealing ball valve for sewage as described in claim 1, characterized in that: A first spring (13) is provided on the outside of the first adjusting bolt (11) and the second adjusting bolt (12).

3. The bidirectional sealing ball valve for sewage as described in claim 1, characterized in that: The valve body (1) has a scraper (15) located inside the ball (2) on the right side, and the scraper (15) is arc-shaped.

4. A bidirectional sealing ball valve for sewage as described in claim 3, characterized in that: An L-shaped angle iron (16) is fixed on one side of the scraper (15). A fixing block (17) is provided inside the valve body (1) near the scraper (15). A third adjusting bolt (18) for passing through the L-shaped angle iron (16) and the fixing block (17) is provided on the fixing block (17). A nut cover (19) is screwed on the outside of the third adjusting bolt (18). A second spring (20) is provided between the L-shaped angle iron (16) and the nut cover (19).

5. A bidirectional sealing ball valve for sewage as described in claim 4, characterized in that: The surface of the arc-shaped scraper (15) is coated with a chromium nitride hard coating, the thickness of which is 0.02mm~0.05mm.

6. The bidirectional sealing ball valve for sewage as described in claim 1, characterized in that: A connecting pipe assembly (14) is detachably connected to one side of the valve body (1). The connecting pipe assembly (14) includes a pipe fitting (401), limiting blocks (402) located on both sides of the pipe fitting (401), a movable frame (403) slidably located within the limiting blocks (402), a rectangular opening (404) located in the middle of the movable frame (403), a rotating shaft (405) located in the middle of the pipe fitting (401), a blade (406) fixed to the outside of the rotating shaft (405), and a connecting pipe assembly (406). The three-pronged cam (407) is located at the top of the rotating shaft (405). The moving frame (403) is located at the rear end of the rectangular opening (404) on the lateral side and is provided with a first guide block (409). The moving frame (403) is located at the front end of the rectangular opening (404) on the other lateral side and is provided with a second guide block (410). A scraper (411) is slidably provided on the bottom of the inner wall of the pipe fitting (401). The scraper (411) is provided with connecting rods (412) connected to the moving frame (403) on the front and rear sides.

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