Water inlet butterfly valve with improved butterfly plate and valve shaft connecting pin

Abstract

The utility model relates to the technical field of butterfly plate connection, and discloses an improved design of a connecting pin of a butterfly plate and a valve shaft of a water inlet butterfly valve, which solves the problems in the background art and comprises an operating mechanism, a valve body, a valve shaft and the butterfly plate, the butterfly plate is arranged in the valve body, the operating mechanism is arranged outside the valve body, and the valve shaft is arranged on the valve body. The butterfly plate and the operating mechanism are synchronously and rotationally connected through the valve shaft, and the butterfly plate and the valve shaft are detachably connected through a symmetric pin connecting structure; the symmetrical pin connecting structure comprises a locking nut, a connecting screw rod and pin shafts, the butterfly plate is provided with two symmetrical connecting parts, one end of the valve shaft is detachably inserted between the two connecting parts, the number of the pin shafts is two, the two pin shafts are inserted from the two sides of the two connecting parts respectively, the two pin shafts are communicated through the connecting screw rod, and the locking nut is connected with the connecting screw rod. The high-voltage switch cabinet has the advantages that the high-voltage switch cabinet is simple in structure, convenient to mount and demount and reliable in field operation.

Description

Technical Field

[0001] The utility model belongs to the technical field of butterfly plate connection, in particular to a water inlet butterfly valve with an improved connecting pin between a butterfly plate and a valve shaft. Background Art

[0002] The turbine inlet butterfly valve is an ideal device for cutting off or connecting the medium in a hydropower station. When the unit is unloaded and the governor fails to operate, the inlet valve can be closed under running water conditions to cut off the water flow, preventing the unit from overspeeding for more than the allowable value and avoiding the expansion of the accident. Therefore, the connection between the butterfly plate and the valve shaft is crucial.

[0003] At present, the butterfly plate and the shaft valve are usually connected by pins. Figure 1 In order to improve the previous pin connection structure, which mainly includes a cover plate, a pin, a butterfly plate and a valve shaft, the valve shaft adopts two separate half-shafts, which are fastened to the butterfly plate through a tangential double-wedge pin, and then the pin is welded and blocked with a cover plate. The structure is very inconvenient to disassemble on site. Therefore, we proposed an inlet butterfly valve with an improved connecting pin between the butterfly plate and the valve shaft. Utility Model Content

[0004] In order to solve the problem that the current pin connection structure between the butterfly plate and the shaft valve is very inconvenient to disassemble on site, the utility model provides the following technical solutions: an improved water inlet butterfly valve with a connecting pin between the butterfly plate and the valve shaft, comprising an operating mechanism, a valve body, a valve shaft and a butterfly plate, a butterfly plate is provided in the valve body, an operating mechanism is provided outside the valve body, the butterfly plate and the operating mechanism are connected by synchronous rotation of the valve shaft, and the butterfly plate and the valve shaft are detachably connected by a symmetrical pin connection structure; the symmetrical pin connection structure includes a locking nut, a connecting screw and a pin shaft, the butterfly plate is provided with two symmetrical connecting parts, one end of the valve shaft is detachably inserted between the two connecting parts, there are two pin shafts, the two pin shafts are respectively inserted from both sides of the two connecting parts, the two pin shafts are connected in series through the connecting screw, and the two ends of the connecting screw are respectively fixed by locking nuts.

[0005] Preferably, a through hole is opened on the side wall of the valve body, the valve shaft rotates and passes through the through hole, an axial end seal is provided between the valve shaft and the through hole, a sealing ring is provided at one end of the through hole located inside the valve body, and the sealing ring is arranged on the valve shaft.

[0006] Preferably, the valve shaft adopts two separate half-shafts, which can increase the flow area of the valve and improve the stress condition of the connecting pin, and can reliably withstand the torque under the extreme working conditions of the valve.

[0007] Preferably, the outer diameter of the butterfly plate is not greater than the inner diameter of the valve body, and the butterfly plate can rotate in the valve body.

[0008] Preferably, the butterfly plate is a plate-like structure with a cavity inside. By providing the cavity inside, the weight of the butterfly plate can be reduced, making it easier and faster to open and close the butterfly plate.

[0009] Preferably, the connecting screw is provided with a gasket circumferentially on the rear portion of the locking nut, and the gasket can prevent the locking nut from loosening.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] During installation, first insert the valve shaft into the butterfly plate, insert the two pins into the connection between the valve shaft and the butterfly plate from both sides, connect the two pins through the connecting screw, and then fix them to the two ends of the connecting screw with gaskets and locking nuts. When disassembling and repairing, first remove the locking nuts and gaskets, then pull out the connecting screw, and use special tools to take out the pins on both sides. This structure is simple, easy to install and disassemble, and reliable in on-site operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0013] Figure 1 It is the pin connection structure before improvement;

[0014] Figure 2 This is a schematic diagram of the installation structure of the utility model as a whole;

[0015] Figure 3 This is a schematic diagram of the installation structure of the utility model as a whole from the side;

[0016] Figure 4 This is a schematic diagram of the overall installation structure of the utility model from a top view;

[0017] Figure 5 This is a schematic diagram of the connection structure between the butterfly plate and the valve shaft of the utility model;

[0018] In the figure: 1. Operating mechanism; 2. Shaft end seal; 3. Valve body; 4. Sealing ring; 5. Lock nut; 6. Gasket; 7. Connecting screw; 8. Pin; 9. Valve shaft; 10. Butterfly plate. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] Depend on Figure 1-5 It is given that the utility model includes an operating mechanism 1, a valve body 3, a valve shaft 9 and a butterfly plate 10. A butterfly plate 10 is arranged inside the valve body 3, and an operating mechanism 1 is arranged outside the valve body 3. The butterfly plate 10 and the operating mechanism 1 are connected by synchronous rotation through the valve shaft 9, and the butterfly plate 10 and the valve shaft 9 are detachably connected through a symmetrical pin connection structure; the symmetrical pin connection structure includes a locking nut 5, a connecting screw 7 and a pin 8. The butterfly plate 10 is provided with two symmetrical connecting parts, one end of the valve shaft 9 is detachably inserted between the two connecting parts, there are two pins 8, the two pins 8 are respectively inserted from both sides of the two connecting parts, the two pins 8 are connected in series through the connecting screw 7, and the two ends of the connecting screw 7 are respectively fixed by locking nuts 5.

[0021] A through hole is opened on the side wall of the valve body 3, and the valve shaft 9 rotates and passes through the through hole. A shaft end seal 2 is arranged between the valve shaft 9 and the through hole. A sealing ring 4 is arranged at one end of the through hole located on the inner side of the valve body 3, and the sealing ring 4 is arranged around the valve shaft 9.

[0022] The valve shaft 9 adopts two separated half shafts, which can increase the flow area of the valve and improve the stress condition of the connecting pin, and can reliably withstand the torque under the extreme working conditions of the valve.

[0023] The outer diameter of the butterfly plate 10 is not larger than the inner diameter of the valve body 3 , and the butterfly plate 10 can rotate in the valve body 3 .

[0024] The butterfly plate 10 is a plate-like structure with a cavity inside. By providing the cavity inside, the weight of the butterfly plate 10 can be reduced, making it easier and faster to open and close the butterfly plate 10.

[0025] The connecting screw 7 is located at the rear of the locking nut 5 and is circumferentially sleeved with a gasket 6. The gasket 6 can prevent the locking nut 5 from loosening.

[0026] Working principle: During installation, first insert the valve shaft 9 into the butterfly plate 10, insert the two pins 8 into the connection between the valve shaft 9 and the butterfly plate 10 from both sides, connect the two pins 8 through the connecting screw 7, and then fix them to the two ends of the connecting screw 7 with gaskets 6 and locking nuts 5. During disassembly and maintenance, first remove the locking nuts 5 and gaskets 6, then pull out the connecting screw 7, and use special tools to take out the pins 8 on both sides. The structure is simple, easy to install and disassemble, and reliable in on-site operation.

[0027] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Although the embodiments of the present invention have been shown and described, it will be understood 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 present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water inlet butterfly valve with an improved connecting pin between a butterfly plate and a valve shaft, comprising an operating mechanism (1), a valve body (3), a valve shaft (9) and a butterfly plate (10), characterized in that: A butterfly plate (10) is provided inside the valve body (3), an operating mechanism (1) is provided outside the valve body (3), the butterfly plate (10) and the operating mechanism (1) are connected to each other in synchronous rotation via a valve shaft (9), and the butterfly plate (10) and the valve shaft (9) are detachably connected via a symmetrical pin connection structure; The symmetrical pin connection structure includes a locking nut (5), a connecting screw (7) and a pin shaft (8); the butterfly plate (10) is provided with two symmetrical connecting parts; one end of the valve shaft (9) is disassembled and inserted between the two connecting parts; there are two pin shafts (8); the two pin shafts (8) are respectively inserted from both sides of the two connecting parts; the two pin shafts (8) are connected in series through the connecting screw (7); and the two ends of the connecting screw (7) are respectively fixed by locking nuts (5).

2. The water inlet butterfly valve with improved butterfly plate and valve shaft connecting pin according to claim 1, characterized in that: A through hole is provided on the side wall of the valve body (3), and the valve shaft (9) is rotatably connected to the through hole. An axial end seal (2) is provided between the valve shaft (9) and the through hole. A sealing ring (4) is provided at one end of the through hole located on the inner side of the valve body (3), and the sealing ring (4) is arranged around the valve shaft (9).

3. The water inlet butterfly valve with improved connecting pin between butterfly plate and valve shaft according to claim 2, characterized in that: The valve shaft (9) adopts two separated half shafts, which can increase the flow area of the valve.

4. The water inlet butterfly valve with improved connecting pin between butterfly plate and valve shaft according to claim 1, characterized in that: The outer diameter of the butterfly plate (10) is not greater than the inner diameter of the valve body (3).

5. The water inlet butterfly valve with improved connecting pin between butterfly plate and valve shaft according to claim 4, characterized in that: The butterfly plate (10) is a plate-shaped structure with a cavity inside.

6. The water inlet butterfly valve with improved connecting pin between butterfly plate and valve shaft according to claim 1, characterized in that: The connecting screw (7) is located at the rear of the locking nut (5) and is circumferentially sleeved with a gasket (6).

Images