Sealing butterfly valve with locking mechanism

Abstract

The invention relates to the technical field of butterfly valves, in particular to a sealing butterfly valve with a locking mechanism, which comprises a protective shell, a limiting groove is formed in the outer side wall of the protective shell, a valve rod is fixedly mounted on the upper surface of a butterfly plate, a first gear sleeve sleeves the top end of the valve rod, a top plate is fixedly mounted at the top end of the protective shell, and a second gear sleeve is fixedly mounted on the surface of the top plate. Teeth are arranged on the inner surfaces of the first gear sleeve and the second gear sleeve, a sliding sleeve is fixedly installed on the surface of the first gear, pressing rods are rotationally installed on the two sides of the sliding sleeve, a sliding rod is fixedly connected to the lower surface of the second gear, a spring sleeves the outer surface of the sliding rod, and the first gear and the second gear are both in meshed connection with the teeth on the inner surfaces of the first gear sleeve and the second gear sleeve. The butterfly valve has the beneficial effects that accidental opening and closing of the gate valve caused by the influence of external factors on the butterfly valve are avoided, compared with locking of a hand wheel, the path is short, stress is uniform, locking reliability is improved, and deviation caused by pressure on the butterfly plate is effectively prevented.

Description

Technical Field

[0001] The invention relates to the field of butterfly valves, in particular to a sealing butterfly valve with a locking mechanism. Background Art

[0002] A butterfly valve, also known as a flap valve, is a regulating valve with a simple structure that can be used for on-off control of low-pressure pipeline media. A butterfly valve refers to a valve with a closing member as a disc that rotates around the valve axis to achieve opening and closing. The valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. It mainly plays a cutting and throttling role in the pipeline. The butterfly valve opening and closing member is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening, closing or regulation.

[0003] After the butterfly plate is rotated, the handwheel is prone to accidental contact due to external factors, which may cause the valve stem to rotate, making it easy for the gate valve to open and close unexpectedly. In order to prevent the handwheel from being accidentally touched, a locking mechanism is usually used to mechanically limit and lock the handwheel after the butterfly plate is operated to avoid accidental opening and closing of the gate valve due to touching the handwheel.

[0004] However, the flow pressure inside the valve body is uneven. When the handwheel is locked, the force is transmitted to the valve stem through the handwheel and then to the butterfly plate. The path is long and the force is uneven, which affects the locking effect and leads to insufficient locking reliability. Moreover, when locking the butterfly valve, it is inconvenient to lock the butterfly plate at any angle after adjustment, which makes it inconvenient to control any angle of opening and closing of the butterfly plate. The applicability is relatively limited. Summary of the Invention

[0005] The object of the present invention is to provide a sealing butterfly valve with a locking mechanism to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: a sealed butterfly valve with a locking mechanism, a valve body, a protective shell fixedly mounted on the upper end surface of the valve body, a limiting groove provided on the outer side wall of the protective shell, and a transmission assembly for opening and closing the butterfly valve provided on the side end surface of the protective shell; Butterfly plate, the upper surface of the butterfly plate is fixedly mounted with a valve stem, the top end of the valve stem is sleeved with a first gear sleeve, the top end of the protective shell is fixedly mounted with a top plate, the surface of the top plate is fixedly mounted with a second gear sleeve, and the inner surfaces of the first gear sleeve and the second gear sleeve are provided with teeth; The first gear and the second gear, a sliding sleeve is fixedly installed on the surface of the first gear, pressure rods are rotatably installed on both sides of the sliding sleeve, the lower surface of the second gear is fixedly connected to the sliding rod, and a spring is sleeved on the outer surface of the sliding rod. The first gear and the second gear are both meshed with the teeth on the inner surfaces of the first gear sleeve and the second gear sleeve.

[0007] Preferably, the transmission assembly includes a handwheel, a worm is fixedly mounted on the inner end surface of the handwheel, a worm wheel is meshedly connected to the side end surface of the worm wheel, and the worm wheel is sleeved on the outer surface of the valve stem.

[0008] Preferably, a threaded hole is provided on the top surface of the protective shell, a fastening bolt is threadedly connected to the inner surface of the threaded hole, and the top plate is fixedly connected to the top of the protective shell by the fastening bolt.

[0009] Preferably, the limiting groove is arranged in an "I" shape, and the pressure rod is engaged with the limiting groove.

[0010] Preferably, the butterfly plate is rotatably mounted on the inner surface of the valve body through the valve stem, and a sealing ring is embedded in the connection between the valve body and the butterfly plate.

[0011] Preferably, a notch is provided on the surface of the sleeve, the sleeve is connected to the slide rod through the notch, the first gear slides along the axial direction of the slide rod through the sleeve, and the first gear, the second gear, the first gear sleeve and the second gear sleeve are coaxially arranged.

[0012] Preferably, one end of the spring abuts against the upper surface of the sliding sleeve, and the other end of the spring abuts against the lower surface of the top plate.

[0013] Preferably, a rotation pin is fixedly installed on both sides of the sliding sleeve, and the pressure rod is rotatably installed with the sliding sleeve through the rotation pin.

[0014] Preferably, the protective shell is fixedly installed with a connecting rod parallel to the outer side of the handwheel, a dial is fixedly installed on the top end of the connecting rod, a pointer used in conjunction with the dial is fixedly installed on the side end face of the handwheel, the dial and the handwheel are arranged coaxially, and the pointer rotates along the scale line on the dial by rotating the handwheel.

[0015] Preferably, the protective shell is provided with a through hole on the inner wall which is at the same level as the worm, and a bearing for the rotation of the worm is embedded in the inner surface of the through hole. The worm is rotated and installed on the inner surface of the through hole. Flanges are fixedly installed at both ends of the valve body, and filter plates are fixedly installed on the inner wall of the valve body.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a sealing butterfly valve with a locking mechanism; The first gear, the second gear and the teeth in the first gear sleeve and the second gear sleeve are meshed to limit the rotation of the valve stem, so as to avoid the butterfly valve from being accidentally opened and closed due to the influence of external factors. Because the top of the sliding rod is fixedly connected to the second gear, and the bottom end of the sliding rod is sleeved with the sliding sleeve, when the pressure rod is pressed, the first gear on the lower end surface of the sliding sleeve will be driven to move upward, thereby compressing the spring on the sliding rod until the sliding sleeve pushes the lower end surface of the second gear. Because the limiting groove is set in the shape of an "I", the pressure rod can be stuck in the limiting groove to limit the first gear and the second gear. The upward position of the two gears is limited, so that the first gear and the second gear can be disengaged from the teeth in the first gear sleeve and the second gear sleeve. The butterfly plate can be opened and closed only after they are disengaged. When the opening and closing angles of the butterfly plate need to be locked, the pressure rod in the sliding limit groove causes the first gear and the second gear to be respectively engaged with the teeth in the first gear sleeve and the second gear sleeve through the rebound of the spring to achieve locking of the opening and closing angles of the butterfly plate. The path is short and the force is evenly distributed, which improves the locking reliability and effectively prevents the butterfly plate from being deflected due to pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the interior of the valve body of the present invention; Figure 3 For the present invention Figure 2 A partial enlarged view of the middle A; Figure 4 This is a cross-sectional view of the interior of the protective shell of the present invention; Figure 5 For the present invention Figure 4 A partial enlarged view of point B in the middle; Figure 6 This is an exploded view of the locking mechanism and the transmission mechanism of the present invention; Figure 7 It is a schematic diagram of the structure of the valve body of the present invention.

[0018] In the figure: 1. Valve body; 2. Protective shell; 3. Butterfly plate; 4. Valve stem; 5. Worm gear; 6. First gear sleeve; 7. Worm; 8. Handwheel; 9. Top plate; 10. Second gear sleeve; 11. Teeth; 12. First gear; 13. Second gear; 14. Sliding rod; 15. Sliding sleeve; 16. Notch; 17. Spring; 18. Pressure rod; 19. Rotating pin; 20. Limiting groove; 21. Connecting rod; 22. Dial; 23. Pointer; 24. Through hole; 25. Sealing ring; 26. Filter screen; 27. Flange; 28. Threaded hole; 29. ​​Fastening bolt. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figures 1 to 7 , the present invention provides a technical solution: a sealing butterfly valve with a locking mechanism; Example 1: In order to prevent the butterfly valve from being accidentally opened and closed due to the influence of external factors, a protective shell 2 is fixedly installed on the upper end surface of the valve body 1, and a limiting groove 20 is provided on the outer side wall of the protective shell 2. A valve stem 4 is fixedly installed on the upper surface of the butterfly plate 3. The top end of the valve stem 4 is sleeved with a first gear sleeve 6, and a top plate 9 is fixedly installed on the top of the protective shell 2. A second gear sleeve 10 is fixedly installed on the surface of the top plate 9. The inner surfaces of the first gear sleeve 6 and the second gear sleeve 10 are provided with teeth 11. A sliding sleeve 15 is fixedly installed on the surface of the first gear 12, and pressure rods 18 are rotatably installed on both sides of the sliding sleeve 15. The lower surface of the second gear 13 is fixedly connected with a sliding rod 14, and the outer surface of the sliding rod 14 is sleeved with a spring 17. The first gear 12 and the second gear 13 are both meshed with the teeth 11 on the inner surfaces of the first gear sleeve 6 and the second gear sleeve 10; The first gear 12, the second gear 13 are engaged with the teeth 11 in the first gear sleeve 6 and the second gear sleeve 10 to limit the rotation of the valve stem 4, thereby avoiding accidental opening and closing of the gate valve due to the influence of external factors, and effectively preventing the butterfly plate 3 from being deflected due to pressure.

[0021] Example 2: On the basis of Example 1, in order to adjust the opening and closing angle of the butterfly valve and lock it, a connecting rod 21 is fixedly installed on the outer side of the protective shell 2 parallel to the handwheel 8, and a dial 22 is fixedly installed on the top of the connecting rod 21. A pointer 23 used in conjunction with the dial 22 is fixedly installed on the side end face of the handwheel 8. The dial 22 is coaxially arranged with the handwheel 8. The pointer 23 rotates along the scale line on the dial 22 by rotating the handwheel 8. The side end face of the protective shell 2 is provided with a transmission assembly for opening and closing the butterfly valve, and the transmission assembly includes: a handwheel 8, a worm 7 is fixedly installed on the inner end face of the handwheel 8, and the side end face of the worm 7 is meshedly connected with a worm gear 5, and the worm gear 5 is sleeved on the outer surface of the valve stem 4; Because the top of the slide rod 14 is fixedly connected to the second gear 13, and the bottom end of the slide rod 14 is sleeved with the slide sleeve 15, when the pressure rod 18 is pressed, the first gear 12 on the lower end surface of the slide sleeve 15 will be driven to move upward, thereby compressing the spring 17 on the slide rod 14 until the slide sleeve 15 pushes the lower end surface of the second gear 13. Since the limiting groove 20 is set in the "I" shape, the pressure rod 18 can be stuck in the limiting groove 20 to limit the upward position of the first gear 12 and the second gear 13, so that the first gear 12 can be moved upward. 2. The second gear 13 disengages from the teeth 11 in the first gear sleeve 6 and the second gear sleeve 10. After disengagement, the worm 7 is driven to rotate by turning the handwheel 8, so that the worm 7 drives the worm wheel 5 to engage and rotate, and then the butterfly plate 3 located inside the valve body 1 at the bottom end of the valve stem 4 is driven to rotate through the engagement and rotation of the worm 7 and the worm wheel 5. While turning the handwheel 8, the angle of rotation of the pointer 23 along the scale line on the dial 22 due to the rotation of the handwheel 8 is observed to adjust the opening and closing angle of the butterfly valve.

[0022] The limiting groove 20 is arranged in an "I" shape, the pressure rod 18 is clamped with the limiting groove 20, a notch 16 is opened on the surface of the sliding sleeve 15, the sliding sleeve 15 is sleeved with the sliding rod 14 through the notch 16, the first gear 12 slides along the axial direction of the sliding rod 14 through the sliding sleeve 15, the first gear 12, the second gear 13, the first gear sleeve 6, and the second gear sleeve 10 are arranged coaxially, and a rotating pin 19 is fixedly installed on both sides of the sliding sleeve 15, and the pressure rod 18 is rotatably installed with the sliding sleeve 15 through the rotating pin 19; When it is necessary to lock the opening and closing angles of the butterfly plate 3, the pressure rod 18 in the sliding limit groove 20 causes the first gear 12 and the second gear 13 to respectively engage with the teeth 11 in the first gear sleeve 6 and the second gear sleeve 10 through the rebound of the spring 17 to achieve locking of the opening and closing angles of the butterfly plate 3. The path is short, the force is evenly distributed, and the locking reliability is improved.

[0023] Working principle: In actual use, first, when adjusting the opening and closing angle of the butterfly valve, because the top end of the slide rod 14 is fixedly connected to the second gear 13, and the bottom end of the slide rod 14 is sleeved with the sleeve 15, when the pressure rod 18 is pressed, the first gear 12 on the lower end face of the sleeve 15 will be driven to move upward, thereby compressing the spring 17 on the slide rod 14 until the sleeve 15 pushes the lower end face of the second gear 13. Since the limit groove 20 is set in the "I" shape, the pressure rod 18 can be stuck in the limit groove 20, which can limit the upward position of the first gear 12 and the second gear 13, so that the first gear 12 and the second gear 13 can be disengaged from the teeth 11 in the first gear sleeve 6 and the second gear sleeve 10. After disengagement, the worm 7 is driven to rotate by turning the hand wheel 8, so that the worm The rod 7 drives the worm gear 5 to engage and rotate, and then the engagement and rotation of the worm 7 and the worm gear 5 drive the butterfly plate 3 located inside the valve body 1 at the bottom end of the valve stem 4 to rotate. While turning the handwheel 8, the rotation angle of the pointer 23 along the scale line on the dial 22 is observed through the rotation of the handwheel 8 to adjust the opening and closing angles of the butterfly valve. When it is necessary to lock the opening and closing angles of the butterfly plate 3, the pressure rod 18 in the sliding limit groove 20 causes the first gear 12 and the second gear 13 to engage with the teeth 11 in the first gear sleeve 6 and the second gear sleeve 10 respectively through the rebound of the spring 17 to achieve locking of the opening and closing angles of the butterfly plate 3. The path is short and the force is evenly distributed, which improves the locking reliability and effectively prevents the butterfly plate 3 from being deflected due to pressure.

[0024] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A sealed butterfly valve with a locking mechanism, characterized in that: A valve body (1), a protective shell (2) is fixedly mounted on the upper end surface of the valve body (1), a limiting groove (20) is provided on the outer side wall of the protective shell (2), and a transmission component for opening and closing the butterfly valve is provided on the side end surface of the protective shell (2); A butterfly plate (3), a valve stem (4) is fixedly mounted on the upper surface of the butterfly plate (3), a first gear sleeve (6) is sleeved on the top end of the valve stem (4), a top plate (9) is fixedly mounted on the top end of the protective shell (2), a second gear sleeve (10) is fixedly mounted on the surface of the top plate (9), and teeth (11) are provided on the inner surfaces of the first gear sleeve (6) and the second gear sleeve (10); A first gear (12) and a second gear (13) are provided. A sliding sleeve (15) is fixedly mounted on the surface of the first gear (12). Pressure rods (18) are rotatably mounted on both sides of the sliding sleeve (15). A sliding rod (14) is fixedly connected to the lower surface of the second gear (13). A spring (17) is sleeved on the outer surface of the sliding rod (14). The first gear (12) and the second gear (13) are both meshed and connected with the teeth (11) on the inner surfaces of the first gear sleeve (6) and the second gear sleeve (10).

2. A sealing butterfly valve with a locking mechanism according to claim 1, characterized in that: The transmission assembly comprises a handwheel (8), a worm (7) fixedly mounted on the inner end surface of the handwheel (8), a worm gear (5) meshingly connected to the side end surface of the worm gear (7), and the worm gear (5) sleeved on the outer surface of the valve stem (4).

3. A sealing butterfly valve with a locking mechanism according to claim 1, characterized in that: A threaded hole (28) is provided on the top surface of the protective shell (2), a fastening bolt (29) is threadedly connected to the inner surface of the threaded hole (28), and the top plate (9) is fixedly connected to the top of the protective shell (2) via the fastening bolt (29).

4. A sealing butterfly valve with a locking mechanism according to claim 1, characterized in that: The limiting groove (20) is arranged in an "I" shape, and the pressure rod (18) is engaged with the limiting groove (20).

5. The sealing butterfly valve with a locking mechanism according to claim 1, characterized in that: The butterfly plate (3) is rotatably mounted on the inner surface of the valve body (1) via the valve stem (4), and a sealing ring (25) is embedded at the connection between the valve body (1) and the butterfly plate (3).

6. The sealing butterfly valve with a locking mechanism according to claim 1, characterized in that: A notch (16) is provided on the surface of the sliding sleeve (15), and the sliding sleeve (15) is sleeved with the sliding rod (14) through the notch (16). The first gear (12) slides along the axial direction of the sliding rod (14) through the sliding sleeve (15). The first gear (12), the second gear (13), the first gear sleeve (6), and the second gear sleeve (10) are coaxially arranged.

7. The sealing butterfly valve with a locking mechanism according to claim 1, characterized in that: One end of the spring (17) abuts against the upper surface of the sliding sleeve (15), and the other end of the spring (17) abuts against the lower surface of the top plate (9).

8. The sealing butterfly valve with a locking mechanism according to claim 1, characterized in that: Rotating pins (19) are fixedly mounted on both sides of the sliding sleeve (15), and the pressure rod (18) is rotatably mounted on the sliding sleeve (15) via the rotating pins (19).

9. The sealing butterfly valve with a locking mechanism according to claim 1, characterized in that: The protective shell (2) is fixedly mounted with a connecting rod (21) parallel to the outer side of the handwheel (8), a scale plate (22) is fixedly mounted on the top end of the connecting rod (21), a pointer (23) used in conjunction with the scale plate (22) is fixedly mounted on the side end face of the handwheel (8), the scale plate (22) and the handwheel (8) are coaxially arranged, and the pointer (23) rotates along the scale line on the scale plate (22) by rotating the handwheel (8).

10. The sealing butterfly valve with a locking mechanism according to claim 1, characterized in that: The protective shell (2) is provided with a through hole (24) on the inner wall thereof which is located at the same horizontal plane as the worm (7). A bearing for rotating the worm (7) is embedded in the inner surface of the through hole (24). The worm (7) is rotatably mounted on the inner surface of the through hole (24). Flanges (27) are fixedly mounted on both ends of the valve body (1), and a filter screen (26) is fixedly mounted on the inner wall of the valve body (1).

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