Butt-clamping butterfly check valve

Abstract

The invention discloses a wafer butterfly check valve, which belongs to the field of valves and comprises a valve body, a valve rod perpendicular to the axis of the valve body is arranged in the valve body through a valve seat, a valve plate mechanism capable of rotating around the valve rod is arranged on the valve rod, and the valve plate mechanism comprises a valve clack rotatably mounted on the valve rod. A sealing assembly matched with the valve seat to seal the valve body is detachably installed on the valve clack, a gasket matched with the sealing assembly and a pressure detection mechanism used for monitoring the pressure of the valve clack are arranged on the valve seat, and the sealing assembly comprises a positioning plate arranged on the valve clack through an installation groove. And a connecting rod penetrating through the valve clack is arranged at the top of the positioning plate. According to the wafer butterfly check valve, when the sealing surface is abraded or damaged, the wafer butterfly check valve can be conveniently detached and replaced with a new assembly, the whole valve does not need to be replaced, the maintenance cost is greatly reduced, the maintenance time is greatly shortened, and the maintainability of the valve is improved.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a wafer-type butterfly check valve. Background Art

[0002] Wafer butterfly check valve is a valve that automatically opens and closes the valve disc depending on the flow of the medium itself to prevent the medium from flowing back. It is also called a clamp-type double-flap check valve or a butterfly check valve. Its working principle is that when the medium flows in a predetermined direction, the medium pressure pushes the valve disc to rotate around the shaft, thereby opening the valve and allowing the medium to pass smoothly. Some valves are equipped with a spring mechanism. At this time, the medium pressure must be greater than the spring force to open the valve. When the medium stops flowing or flows in the reverse direction, the valve disc will quickly close under the action of its own weight and fluid pressure (and spring force if there is a spring), cutting off the flow path of the medium, thereby effectively preventing the medium from flowing back.

[0003] During the operation of the wafer-type butterfly check valve, when the medium flows in the pipeline and pushes the valve disc to open or close, physical contact will occur between the valve disc and the valve seat. This frequent contact, especially under high pressure or high flow rate conditions, will cause the valve disc to wear, and the sealing performance of the valve disc and the valve seat will gradually decrease, and may even cause leakage. Since the valve disc and valve seat of the traditional wafer-type butterfly check valve are usually designed as an integrated unit or fixedly connected, when the valve disc is severely worn, it is usually necessary to replace the entire valve or perform complex maintenance work, which increases maintenance costs and time. Summary of the invention

[0004] The purpose of the present invention is to propose a wafer-type butterfly check valve to solve the problem that when the valve disc of the existing wafer-type butterfly check valve contacts the valve seat and causes the valve disc to wear, the sealing structure on the valve disc is difficult to replace, which increases maintenance cost and time.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technology: a wafer butterfly check valve, comprising a valve body, a valve stem arranged perpendicular to the valve body axis is arranged inside the valve body through a valve seat, and a valve plate mechanism capable of rotating around the valve stem is arranged on the valve stem;

[0006] The valve plate mechanism includes a valve disc rotatably mounted on a valve stem, a sealing assembly detachably mounted on the valve disc for cooperating with a valve seat to seal the valve body, a gasket cooperating with the sealing assembly, and a pressure detection mechanism for monitoring the valve disc pressure are provided on the valve seat.

[0007] As a further description of the above technical solution: the sealing assembly includes a positioning plate arranged on the valve disc through a mounting groove, a connecting rod passing through the valve disc is arranged on the top of the positioning plate, and a limiting nut is arranged on the top of the connecting rod through a threaded end.

[0008] As a further description of the above technical solution: a gasket is arranged at the bottom of the positioning plate, and a spring is arranged on the connecting rod at a position between the positioning plate and the inner wall of the installation groove.

[0009] As a further description of the above technical solution: the interior of the gasket is provided with a plurality of cavities evenly arranged along its annular path.

[0010] As a further description of the above technical solution: the pressure detection mechanism includes a mounting box arranged on the valve seat, a cushion block matching with the gasket is arranged on the top of the mounting box, and a sensor assembly is arranged inside the mounting box.

[0011] As a further description of the above technical solution: the sensor assembly includes a thin film pressure sensor arranged in a mounting box by means of adhesive backing, and a flexible circuit board is arranged on the thin film pressure sensor.

[0012] As a further description of the above technical solution: a positioning column arranged parallel to the valve stem is provided inside the valve body, a torsion spring is sleeved on the valve stem, and two ends of the torsion spring are respectively connected to the valve disc and the positioning column.

[0013] As a further description of the above technical solution: the valve flap is rotatably connected to the valve stem via a connecting sleeve, and an angle sensor for monitoring the rotation angle of the valve flap is provided on the connecting sleeve.

[0014] As a further description of the above technical solution: a battery box for powering the thin film pressure sensor and the angle sensor is arranged on one side of the outside of the valve body, and a hanging ring is arranged on the other side of the outside of the valve body.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0016] By setting a convenient disassembly and assembly sealing component on the valve disc, after the valve disc is frequently opened and closed and wears out due to friction with the valve seat, the sealing component on the valve disc that contacts the valve seat can be replaced promptly and quickly, thereby eliminating the need to replace the entire valve or perform complicated maintenance work, greatly reducing maintenance costs and time;

[0017] The pressure detection mechanism for monitoring the valve disc pressure set on the valve seat can monitor the pressure of the valve disc on the valve seat during the opening and closing process of the valve disc, and can monitor the pressure of the valve disc on the valve seat in real time, ensuring the reliable closure of the valve and avoiding the medium leakage problem caused by the valve disc not being closed in place. In addition, the data obtained through the pressure monitoring structure can be used to understand the operating status and wear of the valve. When the pressure monitoring data shows that the valve is worn or the performance is degraded, the maintenance and maintenance of the valve can be arranged in time, which helps to extend the service life of the valve and reduce the downtime and maintenance costs caused by valve failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 shows a cross-sectional view provided according to an embodiment of the present invention;

[0019] Figure 2 It shows a schematic diagram of the overall structure provided by an embodiment of the present invention;

[0020] Figure 3 A partial cutaway schematic diagram according to an embodiment of the present invention is shown;

[0021] Figure 4 A schematic diagram of the installation structure of the valve plate mechanism provided according to an embodiment of the present invention is shown;

[0022] Figure 5 It shows a structural schematic diagram of a valve plate mechanism provided according to an embodiment of the present invention;

[0023] Figure 6 A schematic structural diagram of a sealing assembly provided according to an embodiment of the present invention is shown;

[0024] Figure 7 A schematic structural diagram of a gasket provided according to an embodiment of the present invention is shown;

[0025] Figure 8 A schematic diagram of the structure of a valve seat provided according to an embodiment of the present invention is shown;

[0026] Fig. 9 A schematic diagram of the structure of a pressure detection mechanism provided according to an embodiment of the present invention is shown;

[0027] Fig.10 A schematic structural diagram of a sensor assembly provided according to an embodiment of the present invention is shown.

[0028] Legend:

[0029] 1. Valve body; 2. Valve seat; 21. Gasket; 22. Pressure detection mechanism; 221. Installation box; 222. Spacer; 223. Sensor assembly; 2231. Thin film pressure sensor; 2232. Adhesive backing; 2233. Flexible circuit board; 3. Valve stem; 31. Positioning column; 32. Torsion spring; 33. Connecting sleeve; 34. Angle sensor; 4. Valve plate mechanism; 41. Valve disc; 42. Sealing assembly; 421. Positioning plate; 422. Gasket; 4221. Cavity; 423. Connecting rod; 424. Threaded end; 425. Limit nut; 426. Spring; 5. Battery box; 6. Lifting ring. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0031] Reference Figure 1-Figure 10 The present embodiment provides a wafer butterfly check valve, comprising a valve body 1, wherein a valve stem 3 arranged perpendicular to the axis of the valve body 1 is disposed inside the valve body 1 through a valve seat 2, and a valve plate mechanism 4 capable of rotating around the valve stem 3 is disposed on the valve stem 3;

[0032] The valve plate mechanism 4 includes a valve disc 41 rotatably mounted on the valve stem 3, a sealing component 42 is detachably mounted on the valve disc 41 for cooperating with the valve seat 2 to seal the valve body 1, a gasket 21 cooperating with the sealing component 42 is arranged on the valve seat 2, a positioning column 31 arranged parallel to the valve stem 3 is arranged inside the valve body 1, a torsion spring 32 is sleeved on the valve stem 3, and both ends of the torsion spring 32 are respectively connected to the valve disc 41 and the positioning column 31.

[0033] In the present invention, the valve body 1 of the wafer-type butterfly check valve is installed in a fluid pipeline for use. When the medium flows in a predetermined direction, the valve flap 41 rotates around the valve stem 3 under the push of the medium pressure. At this time, the two valve flaps 41 squeeze the torsion spring 32 and present a V-shape on both sides of the positioning column 31. In this state, the valve is open and the medium is allowed to pass through the valve. When the medium stops flowing or flows in the reverse direction, the valve flap 41 will quickly close under the action of its own weight, fluid pressure and the restoring elastic force of the torsion spring 32. At this time, the sealing component 42 on the valve flap 41 contacts the valve seat 2 and cooperates with the rubber gasket 21 on the valve seat 2 to form a seal, thereby cutting off the flow path of the medium and preventing the medium from flowing back.

[0034] Specifically, Figure 1 , Figure 5 and Figure 6 As shown, the sealing assembly 42 includes a positioning plate 421 arranged on the valve disc 41 through a mounting groove, a connecting rod 423 penetrating the valve disc 41 is arranged on the top of the positioning plate 421, and a limiting nut 425 is arranged on the top of the connecting rod 423 through a threaded end 424, a gasket 422 is arranged at the bottom of the positioning plate 421, and a spring 426 is arranged on the connecting rod 423 at a position between the positioning plate 421 and the inner wall of the mounting groove.

[0035] Among them, a mounting groove is provided at the bottom of the valve disc 41 to match the positioning plate 421. After the connecting rod 423 on the positioning plate 421 passes through the valve disc 41, it is fixed to the bottom of the valve disc 41 through the limit nut 425 on the threaded end 424. When the medium stops flowing or flows in the reverse direction, the valve disc 41 will quickly close under the action of its own weight, fluid pressure and the restoring elastic force of the torsion spring 32. At this time, the gasket 422 on the positioning plate 421 will contact the gasket 21 on the valve seat 2 to achieve sealing. When the valve disc 41 is frequently opened and closed, causing the sealing component 42 to be worn , just remove the limiting nut 425 on the threaded end 424, and then remove the positioning plate 421 from the mounting groove of the valve disc 41 to replace the sealing assembly 42, so there is no need to replace the entire valve or perform complicated maintenance work, which greatly reduces the maintenance cost and time. The spring 426 on the connecting rod 423 plays a sealing compensation role. The elastic force of the spring 426 ensures that the gasket 422 under the positioning plate 421 always has sufficient pressure on the gasket 21, thereby ensuring the sealing effect of the sealing assembly 42 when the valve expands and contracts due to heat.

[0036] It should be noted that the gasket 422 has a plurality of cavities 4221 evenly arranged along its annular path. The design of the cavities 4221 makes the elastic force of the rubber gasket 422 stronger. When the valve flap 41 is rapidly closed, the valve flap 41 hits the valve seat 2. The gasket 422 can perform buffering protection while sealing, thereby protecting the valve flap 41 and improving the safety of the entire valve plate mechanism 4.

[0037] Specifically, Figure 1 , Figure 8-Figure 10 As shown, a pressure detection mechanism 22 for monitoring the pressure of the valve disc 41 is arranged on the valve seat 2, and the pressure detection mechanism 22 includes a mounting box 221 arranged on the valve seat 2, and a pad 222 matching the gasket 21 is arranged on the top of the mounting box 221, and a sensor assembly 223 is arranged inside the mounting box 221. The sensor assembly 223 includes a thin film pressure sensor 2231 arranged in the mounting box 221 through a backing adhesive 2232, and a flexible circuit board 2233 is arranged on the thin film pressure sensor 2231. The valve disc 41 is rotatably connected to the valve stem 3 through a connecting sleeve 33, and an angle sensor 34 for monitoring the rotation angle of the valve disc 41 is arranged on the connecting sleeve 33. A battery box 5 for powering the thin film pressure sensor 2231 and the angle sensor 34 is arranged on one side of the outside of the valve body 1, and a lifting ring 6 is arranged on the other side of the outside of the valve body 1.

[0038] The film pressure sensor 2231 is fixed in the installation box 221 by means of adhesive 2232, the installation box 221 is fixed on the valve seat 2 by means of screw fasteners, and then a pad 222 of the same material as the gasket 21 is covered on the installation box 221. The film pressure sensor 2231 can monitor the pressure of the valve disc 41 on the valve seat 2, and transmit the pressure data through the transmission module on the flexible circuit board 2233. When the valve disc 41 is closed, if the pressure value displayed by the pressure detection mechanism 22 reaches a preset threshold value, it can be judged that the valve disc 41 has been closed in place, and at the same time, the angle sensor on the valve disc 41 is used to detect the pressure value displayed by the pressure detection mechanism 22. The sensor 34 ensures the reliable closure of the valve flap 41, avoiding the problem of medium leakage caused by the valve flap 41 not being closed properly. When the pressure value displayed by the pressure detection mechanism 22 does not reach the preset threshold, the operator can arrange the maintenance and servicing of the valve in time, which helps to extend the service life of the valve and reduce the downtime and maintenance costs caused by valve failure. A battery is installed in the battery box 5, which can power the film pressure sensor 2231 and the angle sensor 34 when the check valve is in use. The lifting ring 6 on the valve body 1 is used for the cooperation of the installation tools during the transportation and installation of the valve.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A wafer butterfly check valve, characterized in that: The valve body (1) comprises a valve stem (3) arranged perpendicular to the axis of the valve body (1) through a valve seat (2) inside the valve body (1), and a valve plate mechanism (4) capable of rotating around the valve stem (3) is arranged on the valve stem (3); The valve plate mechanism (4) comprises a valve flap (41) rotatably mounted on a valve stem (3); a sealing component (42) is detachably mounted on the valve flap (41) and cooperates with a valve seat (2) to seal the valve body (1); a gasket (21) cooperating with the sealing component (42) is provided on the valve seat (2), and a pressure detection mechanism (22) for monitoring the pressure of the valve flap (41) is provided.

2. A wafer-type butterfly check valve according to claim 1, characterized in that: The sealing assembly (42) comprises a positioning plate (421) arranged on the valve disc (41) through a mounting groove, a connecting rod (423) penetrating the valve disc (41) is arranged on the top of the positioning plate (421), and a limiting nut (425) is arranged on the top of the connecting rod (423) through a threaded end (424).

3. A wafer-type butterfly check valve according to claim 2, characterized in that: A washer (422) is provided at the bottom of the positioning plate (421), and a spring (426) is provided on the connecting rod (423) at a position between the positioning plate (421) and the inner wall of the installation groove.

4. The wafer-type butterfly check valve according to claim 3, characterized in that: The gasket (422) is provided with a plurality of cavities (4221) evenly arranged along its annular path.

5. The wafer-type butterfly check valve according to claim 1, characterized in that: The pressure detection mechanism (22) comprises a mounting box (221) arranged on the valve seat (2), a cushion block (222) matching with the gasket (21) being arranged on the top of the mounting box (221), and a sensor assembly (223) being arranged inside the mounting box (221).

6. The wafer-type butterfly check valve according to claim 5, characterized in that: The sensor assembly (223) comprises a thin film pressure sensor (2231) arranged in a mounting box (221) via a backing adhesive (2232), and a flexible circuit board (2233) is arranged on the thin film pressure sensor (2231).

7. The wafer-type butterfly check valve according to claim 6, characterized in that: A positioning column (31) arranged parallel to the valve stem (3) is provided inside the valve body (1); a torsion spring (32) is sleeved on the valve stem (3), and two ends of the torsion spring (32) are respectively connected to the valve flap (41) and the positioning column (31).

8. The wafer-type butterfly check valve according to claim 7, characterized in that: The valve flap (41) is rotatably connected to the valve stem (3) via a connecting sleeve (33), and an angle sensor (34) for monitoring the rotation angle of the valve flap (41) is provided on the connecting sleeve (33).

9. The wafer-type butterfly check valve according to claim 8, characterized in that: A battery box (5) for supplying power to the thin film pressure sensor (2231) and the angle sensor (34) is provided on one side of the exterior of the valve body (1), and a lifting ring (6) is provided on the other side of the exterior of the valve body (1).

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