A wafer double-disc check valve with a limit position structure

Abstract

This utility model discloses a double-disc check valve with a limiting structure. A fixed shaft is disposed inside the valve body. A first semi-circular butterfly plate is rotatably connected to the fixed shaft through a first connecting sleeve, and a second semi-circular butterfly plate is rotatably connected to the fixed shaft through a second connecting sleeve. Torsion return springs on the fixed shaft support the surfaces of the first and second semi-circular butterfly plates respectively. Both the driving shaft and the driven shaft are rotatably disposed inside the valve body. A first limiting plate is connected to the driving shaft through a third connecting sleeve, and a second limiting plate is connected to the driven shaft through a fourth connecting sleeve. The first and second limiting plates engage with the serrated surfaces of the third and fourth connecting sleeves. This utility model has a reasonable structure. When the driving shaft is rotated, the driven shaft rotates accordingly, thereby simultaneously limiting the maximum opening angle of the first and second semi-circular butterfly plates, and thus controlling the maximum flow rate of the valve body.

Description

Technical Field

[0001] This utility model relates to the field of machinery, and more particularly to valve technology, specifically a double-disc check valve with a limiting structure. Background Technology

[0002] The wafer-type double-disc check valve is an automatic valve device that prevents the backflow of media in a pipeline. This valve adopts a wafer-type connection structure, consisting of a valve body, two semi-circular discs, a shaft, and a spring. The two semi-circular discs close quickly through forced reset by the spring. It is mainly used in industrial, environmental protection, water treatment, and high-rise building water supply and drainage fields, and can handle water, steam, oil, and acid / alkali media.

[0003] In the existing technology, the two semi-circular discs in the wafer double-disc check valve do not have a limiting structure. However, depending on the process, if the maximum flow rate needs to be limited in the same pipeline, the semi-circular discs themselves do not have the function of adjusting the maximum flow rate. They can only be adjusted by connecting an external flow control valve. This method increases the cost and is not very flexible for the wafer double-disc check valve itself. Therefore, there is an urgent need for an improved technology to solve the above-mentioned problems in the existing technology. Utility Model Content

[0004] The purpose of this invention is to provide a double-disc check valve with a limiting structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a double-disc check valve with a limiting structure, comprising a valve body, a triangular stop bar, a first semi-circular butterfly plate, a second semi-circular butterfly plate, a fixed shaft, and a limiting assembly. A boss is provided at one end of the valve body. A triangular stop bar is located at the boss and arranged along the diameter direction inside the valve body. The fixed shaft is arranged along the diameter direction inside the valve body. Two first connecting sleeves are symmetrically arranged on one side of the first semi-circular butterfly plate, and two second connecting sleeves are symmetrically arranged on one side of the second semi-circular butterfly plate. The first semi-circular butterfly plate is rotatably connected to the fixed shaft through the first connecting sleeves, and the second semi-circular butterfly plate is rotatably connected to the fixed shaft through the second connecting sleeves. A torsion return spring is sleeved on the fixed shaft, and the two ends of the torsion return spring are respectively supported on the surfaces of the first and second semi-circular butterfly plates.

[0006] The limiting assembly includes a drive shaft, a driven shaft, a first limiting plate, and a second limiting plate. Both the drive shaft and the driven shaft are rotatably mounted within the valve body. A third connecting sleeve is provided at one end of the first limiting plate, and the first limiting plate is sleeved with the drive shaft through the third connecting sleeve and fastened with bolts. A fourth connecting sleeve is provided at one end of the second limiting plate, and the second limiting plate is sleeved with the driven shaft through the fourth connecting sleeve and fastened with bolts. The first and second limiting plates correspond one-to-one. The surfaces of the third and fourth connecting sleeves are both provided with serrations, and the third connecting sleeve and the corresponding fourth connecting sleeve engage through the serrations. The first limiting plate is in limiting engagement with the surface of the first semi-circular butterfly plate, and the second limiting plate is in limiting engagement with the surface of the second semi-circular butterfly plate.

[0007] Preferably, the present invention provides a double-disc check valve with a limiting structure, wherein the end face of the boss located inside the valve body is provided with an annular groove and a sealing ring is provided in the annular groove, and the first semi-circular butterfly plate and the second semi-circular butterfly plate are tightly fitted with the sealing ring.

[0008] Preferably, the present invention provides a double-disc check valve with a limiting structure, wherein the triangular stop rod, the fixed shaft rod, the driving shaft rod, and the driven shaft rod are all parallel to each other.

[0009] Preferably, the present invention provides a double-disc check valve with a limiting structure, wherein the two ends of the fixed shaft are fastened to the valve body by bolts and washers.

[0010] Preferably, the present invention provides a double-disc check valve with a limiting structure, wherein two shaft holes are opened on one side of the inner wall of the valve body, and a through hole is opened on the side wall of the valve body at a position coaxial with the two shaft holes. A sealing collar is provided in the through hole. One end of the driving shaft and the driven shaft are rotatably engaged with one shaft hole. The ends of the driving shaft and the driven shaft away from the shaft are provided with a first limiting collar and a sealing anti-slip washer. The sealing anti-slip washer is clamped between the corresponding first limiting collar and the inner wall of the valve body. The ends of the driving shaft and the driven shaft away from the shaft holes are rotatably engaged with one sealing collar. The end of the driving shaft away from the shaft hole passes through the sealing collar and extends to the outside of the valve body. The end of the driving shaft located outside the valve body is provided with an internal hexagonal head.

[0011] Preferably, the present invention provides a double-disc check valve with a limiting structure, wherein the fixed shaft is provided with a second limiting collar between the first connecting sleeve and the inner wall of the valve body, and the fixed shaft is provided with a third limiting collar between the second connecting sleeve and the torsion return spring.

[0012] Preferably, the present invention provides a double-disc check valve with a limiting structure, wherein flanges are provided at both ends of the valve body.

[0013] Preferably, the present invention provides a double-disc check valve with a limiting structure, wherein the cross-section of the triangular stop bar is an isosceles triangle.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] (1) The valve body is equipped with an active shaft and a fixed shaft. The first limiting plate is connected to the active shaft through the third connecting sleeve, and the second limiting plate is connected to the driven shaft through the fourth connecting sleeve. The third connecting sleeve and the fourth connecting sleeve are meshed by saw teeth. When the active shaft is rotated, the driven shaft rotates accordingly. The first limiting plate opens outward, and the second limiting plate opens in the opposite direction, thereby limiting the maximum opening angle of the first semi-circular butterfly plate and the second semi-circular butterfly plate at the same time, thereby realizing the control of the maximum flow of the valve body. Moreover, the angle of the first limiting plate and the second limiting plate can be adjusted at the same time by simply rotating the active shaft, which is convenient for operation.

[0016] (2) A triangular baffle is provided inside the valve body and at the boss to divert the fluid, increase the flow rate and reduce the resistance. Attached Figure Description

[0017] Figure 1 This is a side view cross-sectional structural diagram of the present invention;

[0018] Figure 2 This is a top view of the cross-sectional structure of the present invention located at the drive shaft.

[0019] Figure 3 This is a top view of the cross-sectional structure of the present invention located at the driven shaft.

[0020] Figure 4 This is a schematic diagram of the state when the present invention is in the limiting position.

[0021] In the diagram: 1. Valve body; 2. Triangular stop bar; 3. First semi-circular butterfly plate; 4. Second semi-circular butterfly plate; 5. Fixed shaft; 6. Boss; 7. First connecting sleeve; 8. Second connecting sleeve; 9. Torque return spring; 10. Driven shaft; 11. Driven shaft; 12. First limiting plate; 13. Second limiting plate; 14. Third connecting sleeve; 15. Fourth connecting sleeve; 16. Serrated edge; 17. Sealing ring; 18. Shaft hole; 19. Sealing collar; 20. First limiting collar; 21. Sealing anti-slip washer; 22. Hexagonal head; 23. Second limiting collar; 24. Third limiting collar; 25. Flange. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] It should be noted that in the description of this utility model, the terms "inner", "outer", "upper", "lower", "both sides", "one end", "the other end", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not 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 limitations on this utility model.

[0024] Please see Figure 1-3 This utility model provides a technical solution: a double-disc check valve with a limiting structure, including a valve body 1, a triangular stop bar 2, a first semi-circular butterfly plate 3, a second semi-circular butterfly plate 4, a fixed shaft 5, and a limiting assembly. A boss 6 is provided at one end of the valve body 1. A triangular stop bar 2 is located at the boss 6 and is arranged along the diameter direction inside the valve body 1. The cross-section of the triangular stop bar 2 is an isosceles triangle to ensure that the fluid is distributed as evenly as possible through the triangular stop bar 2. The fixed shaft 5 is arranged inside the valve body 1 along the diameter direction. Both ends of the fixed shaft 5 are fastened to the valve body 1 by bolts and washers to achieve the installation of the fixed shaft 5 and to seal the connection between the fixed shaft 5 and the valve body 1. Two first connecting sleeves 7 are symmetrically arranged on one side of the first semi-circular butterfly plate 3, and two second connecting sleeves 8 are symmetrically arranged on one side of the second semi-circular butterfly plate 4. The first semi-circular butterfly plate 3 is rotatably connected to the fixed shaft 5 through the first connecting sleeves 7, and the second semi-circular butterfly plate 4 is rotatably connected through the first connecting sleeves 7. The valve body 1 is rotatably connected to the fixed shaft 5 via the second connecting sleeve 8. The fixed shaft 5 is fitted with a torsion return spring 9. The two ends of the torsion return spring 9 are respectively supported on the surfaces of the first semi-circular butterfly plate 3 and the second semi-circular butterfly plate 4. The end face of the boss 6 located inside the valve body 1 has an annular groove and a sealing ring 17 is provided in the annular groove. The first semi-circular butterfly plate 3 and the second semi-circular butterfly plate 4 are tightly fitted with the sealing ring 17. When there is no fluid, the first semi-circular butterfly plate 3 and the second semi-circular butterfly plate 4 are pressed onto the sealing ring 17 by the torsion return spring 9, which can prevent the fluid from flowing back from the fit between the first semi-circular butterfly plate 3 and the second semi-circular butterfly plate 4 and the boss 6. The fixed shaft 5 is fitted with a second limiting collar 23 between the first connecting sleeve 7 and the inner wall of the valve body 1. The fixed shaft 5 is fitted with a third limiting collar 24 between the second connecting sleeve 8 and the torsion return spring 9. Flanges 25 are provided at both ends of the valve body 1 to realize the connection between the valve body 1 and the pipeline.

[0025] The limiting assembly includes a drive shaft 10, a driven shaft 11, a first limiting plate 12, and a second limiting plate 13. Both the drive shaft 10 and the driven shaft 11 are rotatably mounted within the valve body 1. The triangular stop 2, the fixed shaft 5, the drive shaft 10, and the driven shaft 11 are all parallel to each other, ensuring that after the fluid is diverted by the triangular stop 2, the two fluid streams flow towards the first semi-circular butterfly plate 3 and the second semi-circular butterfly plate 4, respectively. When flow restriction is required, the first limiting plate 12 and the second limiting plate 13 on the drive shaft 10 and the driven shaft 11 can precisely abut against the first semi-circular butterfly plate 3 and the second semi-circular butterfly plate 4, respectively. A third connecting sleeve is provided at one end of the first limiting plate 12. The first limiting plate 12 is connected to the drive shaft 10 via the third connecting sleeve 14 and fastened with bolts. The second limiting plate 13 has a fourth connecting sleeve 15 at one end, which is connected to the driven shaft 11 via the fourth connecting sleeve 15 and fastened with bolts. The first limiting plate 12 and the second limiting plate 13 correspond one-to-one. The surfaces of the third connecting sleeve 14 and the fourth connecting sleeve 15 are both provided with serrations 16. The third connecting sleeve 14 and the corresponding fourth connecting sleeve 15 engage with the serrations 16. The first limiting plate 12 is limited to the surface of the first semi-circular butterfly plate 3, and the second limiting plate 13 is limited to the surface of the second semi-circular butterfly plate 4.

[0026] Two shaft holes 18 are opened on one side of the inner wall of the valve body 1. A through hole is opened on the side wall of the valve body 1 at a position coaxial with the two shaft holes 18. A sealing collar 19 is provided in the through hole. One end of the driving shaft 10 and the driven shaft 11 are rotatably engaged with one shaft hole 18. The end of the driving shaft 10 and the driven shaft 11 away from the shaft is provided with a first limiting collar 20 and a sealing anti-slip washer 21. The sealing anti-slip washer 21 is clamped between the corresponding first limiting collar 20 and the inner wall of the valve body 1. The end of the driving shaft 10 and the driven shaft 11 away from the shaft hole 18 is rotatably engaged with one sealing collar 19. The end of the driving shaft 10 away from the shaft hole 18 passes through the sealing collar 19 and extends to the outside of the valve body 1. The end of the driving shaft 10 located outside the valve body 1 is provided with an internal hexagon head 22.

[0027] Assembly method and operating principle: First, press the sealing ring 17 into the annular groove on the inner end face of the boss 6. Then, align the first semi-circular butterfly plate 3 with the second connecting sleeve 8 of the second semi-circular butterfly plate 4 via the first connecting sleeve 7. Next, pass the fixed shaft 5 sequentially through the second limiting sleeve 23, the first connecting sleeve 7, the second connecting sleeve 8, the third limiting sleeve 24, the torsion return spring 9, the third limiting sleeve 24, the second connecting sleeve 8, the first connecting sleeve 7, and the second limiting sleeve 23. Place the above structure together into the valve body 1, and use gaskets and bolts to secure both ends of the fixed shaft 5 to the inner walls on both sides of the valve body 1. Insert the driving shaft 10 and the driven shaft 11 into the valve body 1 from the sealing sleeve 19 on one side of the valve body 1. The drive shaft 10 is sequentially passed through the sealing anti-slip washer 21, the first limiting collar 20, and the third connecting sleeve 14 of at least two first limiting plates 12. The end of the drive shaft 10 is inserted into the shaft hole 18, and the first limiting collar 20 is fastened to the drive shaft 10 with bolts. Then, the driven shaft 11 is sequentially passed through the sealing anti-slip washer 21, the first limiting collar 20, and the fourth connecting sleeve 15 of at least two second limiting plates 13. The end of the driven shaft 11 is inserted into the shaft hole 18, and the second limiting collar 23 is fastened to the driven shaft 11 with bolts. At this time, the first limiting plate 12 and the second limiting plate 13 are aligned one-to-one, and the serrations 16 of the third connecting sleeve 14 and the fourth connecting sleeve 15 are engaged. At the same time, the third connecting sleeve 14 is fastened to the drive shaft 10 with bolts, and the fourth connecting sleeve is fastened to the driven shaft 11, completing the assembly. In use, the drive shaft 10 is rotated as needed, causing the first limiting plate 12 to rotate around the drive shaft 10. Through the meshing of the serrations 16 between the third connecting sleeve 14 and the fourth connecting sleeve 15, the driven shaft 11 drives the second limiting plate 13 to rotate in the opposite direction and at the same speed as the first limiting plate 12. When fluid enters from one end of the boss 6 of the valve body 1 and is diverted by the triangular stop 2, the first semi-circular butterfly plate 3 and the second semi-circular butterfly plate 4 are pushed open respectively. The first semi-circular butterfly plate 3 abuts against the first limiting plate 12, and the second semi-circular butterfly plate 4 abuts against the second limiting plate 13, thereby achieving maximum flow control. Figure 4As shown. After all the fluid has flowed through the valve body 1, the first semi-circular butterfly plate 3 and the second semi-circular butterfly plate 4 press against the sealing ring 17 of the boss 6 again by the push of the torsion return spring 9. This utility model has a reasonable structure. The valve body 1 is equipped with an active shaft 10 and a fixed shaft 5. The first limiting plate 12 is connected to the active shaft 10 through the third connecting sleeve 14, and the second limiting plate 13 is connected to the driven shaft 11 through the fourth connecting sleeve 15. The third connecting sleeve 14 and the fourth connecting sleeve 15 are engaged by serrations 16. When the active shaft 10 is rotated, the driven shaft 11 rotates accordingly. The first limiting plate 12 opens outward, and the second limiting plate 13 opens in the opposite direction, thereby simultaneously limiting the maximum opening angle of the first semi-circular butterfly plate 3 and the second semi-circular butterfly plate 4, thus achieving the control of the maximum flow rate of the valve body 1. Moreover, the angles of the first limiting plate 12 and the second limiting plate 13 can be adjusted simultaneously by simply rotating the active shaft 10, which is convenient for operation. A triangular stop bar 2 is provided inside the valve body 1 and located at the boss 6 to achieve fluid diversion, increase flow velocity, and reduce resistance.

[0028] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

[0029] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications and equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A double-disc check valve with a limiting structure, characterized in that: The valve body (1) includes a valve body (1), a triangular stop bar (2), a first semi-circular butterfly plate (3), a second semi-circular butterfly plate (4), a fixed shaft (5), and a limiting assembly. A boss (6) is provided at one end of the valve body (1). A triangular stop bar (2) is provided at the boss (6) and along the diameter direction inside the valve body (1). The fixed shaft (5) is provided inside the valve body (1) along the diameter direction. Two first connecting sleeves (7) are symmetrically provided on one side of the first semi-circular butterfly plate (3), and two second connecting sleeves (8) are symmetrically provided on one side of the second semi-circular butterfly plate (4). The first semi-circular butterfly plate (3) is rotatably connected to the fixed shaft (5) through the first connecting sleeves (7), and the second semi-circular butterfly plate (4) is rotatably connected to the fixed shaft (5) through the second connecting sleeves (8). A torsion return spring (9) is sleeved on the fixed shaft (5). The two ends of the torsion return spring (9) are respectively supported on the surfaces of the first semi-circular butterfly plate (3) and the second semi-circular butterfly plate (4). The limiting assembly includes a drive shaft (10), a driven shaft (11), a first limiting plate (12), and a second limiting plate (13). Both the drive shaft (10) and the driven shaft (11) are rotatably mounted within the valve body (1). A third connecting sleeve (14) is provided at one end of the first limiting plate (12), and the first limiting plate (12) is sleeved with the drive shaft (10) through the third connecting sleeve (14) and secured with bolts. A fourth connecting sleeve (15) is provided at one end of the second limiting plate (13), and the second limiting plate (13) is connected to... The fourth connecting sleeve (15) is sleeved with the driven shaft (11) and fastened with bolts. The first limiting plate (12) and the second limiting plate (13) correspond one to one. The surfaces of the third connecting sleeve (14) and the fourth connecting sleeve (15) are provided with serrations (16). The third connecting sleeve (14) and the corresponding fourth connecting sleeve (15) are engaged by the serrations (16). The first limiting plate (12) is limited to the surface of the first semi-circular butterfly plate (3), and the second limiting plate (13) is limited to the surface of the second semi-circular butterfly plate (4).

2. A double-disc check valve with a limiting structure according to claim 1, characterized in that: The boss (6) has an annular groove on one end face inside the valve body (1) and a sealing ring (17) is provided in the annular groove. The first semi-circular butterfly plate (3) and the second semi-circular butterfly plate (4) are tightly fitted with the sealing ring (17).

3. A double-disc check valve with a limiting structure according to claim 1, characterized in that: The triangular stop (2), fixed shaft (5), driving shaft (10) and driven shaft (11) are all parallel to each other.

4. A double-disc check valve with a limiting structure according to claim 1, characterized in that: The two ends of the fixed shaft (5) are fastened to the valve body (1) by bolts and washers.

5. A double-disc check valve with a limiting structure according to claim 1, characterized in that: Two shaft holes (18) are opened on one side of the inner wall of the valve body (1). A through hole is opened on the side wall of the valve body (1) at a position coaxial with the two shaft holes (18). A sealing collar (19) is provided in the through hole. One end of the driving shaft (10) and the driven shaft (11) are rotatably engaged with one shaft hole (18). A first limiting collar (20) and a sealing anti-slip washer (21) are provided at the ends of the driving shaft (10) and the driven shaft (11) away from the shaft. The sealing anti-slip washer (21) is clamped between the corresponding first limiting collar (20) and the inner wall of the valve body (1). The end of the driving shaft (10) and the driven shaft (11) away from the shaft hole (18) are respectively rotatably engaged with a sealing collar (19). The end of the driving shaft (10) away from the shaft hole (18) passes through the sealing collar (19) and extends to the outside of the valve body (1). The end of the driving shaft (10) located outside the valve body (1) is provided with an internal hexagon head (22).

6. A double-disc check valve with a limiting structure according to claim 1, characterized in that: The fixed shaft (5) is fitted with a second limiting collar (23) between the first connecting sleeve (7) and the inner wall of the valve body (1), and the fixed shaft (5) is fitted with a third limiting collar (24) between the second connecting sleeve (8) and the torsion return spring (9).

7. A double-disc check valve with a limiting structure according to claim 1, characterized in that: Flanges (25) are provided at both ends of the valve body (1).

8. A double-disc check valve with a limiting structure according to claim 1, characterized in that: The cross section of the triangular stop (2) is an isosceles triangle.

Images