Large-caliber low-pressure all-welded flange type butterfly valve

Abstract

The utility model relates to the technical field of butterfly valves, and particularly discloses a large-caliber low-pressure all-welded flange type butterfly valve which comprises a communicating pipe, flanges are fixedly connected to the two ends of the communicating pipe respectively, a welded raft plate is arranged in the middle of the communicating pipe, sealing pieces are fixedly connected to the positions, on the two sides of the welded raft plate, of the outer wall of the communicating pipe, and a thrust ring is fixedly connected to the inner wall of the communicating pipe. When the welding type butterfly valve is used, the valve body and the valve plate of the welding type butterfly valve are all formed by welding steel plates, the cost is low, the production period is short, material supply is rapid, the two sides of the welding valve clack are connected with the auxiliary shaft in an inserted mode through the main shaft, the bearing is installed outside the valve body, and therefore the welding type butterfly valve is convenient to use. The butterfly valve has the advantages of greatly reducing the switching torque of the valve, reducing the locking probability of a rotating shaft in the operation process of the butterfly valve, reducing abrasion, prolonging the service life, enabling the butterfly valve to have the advantages of low torque and long service life, simultaneously adopting an external bearing structure, not needing to disassemble a valve body assembly, and being convenient to implement and maintain on site.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, specifically a large-diameter, low-pressure, fully welded flange butterfly valve. Background Technology

[0002] Butterfly valves, as an important fluid control device, are widely used in pipeline systems to cut off, regulate, and change the flow direction of fluids. However, for large-diameter, low-pressure applications, such as ventilation ducts and air flow control in the metallurgical industry, existing butterfly valves typically use built-in bearings or seals, which makes maintenance and disassembly difficult and inconvenient in the field when a fault occurs. Therefore, we propose a large-diameter, low-pressure, fully welded flange butterfly valve. Utility Model Content

[0003] The purpose of this invention is to provide a large-diameter, low-pressure, fully welded flange butterfly valve to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a large-diameter, low-pressure, fully welded flange butterfly valve, comprising a connecting pipe, flanges fixedly connected to both ends of the connecting pipe, a welded raft plate in the middle of the connecting pipe, sealing elements fixedly connected to both sides of the welded raft plate on the outer wall of the connecting pipe, thrust rings fixedly connected to both sides of the welded raft plate on the inner wall of the connecting pipe, fixing sleeves fixedly connected to the outer sides of the sealing elements on both sides of the connecting pipe, a main shaft passing through one side of the connecting pipe, and a secondary shaft passing through the other side of the connecting pipe, the main shaft and the secondary shaft passing through the fixing sleeves, sealing elements, and thrust rings on both sides of the connecting pipe and being inserted into both sides of the welded raft plate.

[0005] The welded raft plate includes a valve shaft, with valve discs integrally welded to both sides of the valve shaft, and slots opened at both ends of the valve shaft.

[0006] The seal has a filling groove on its inner side, which is filled with filler, and a filler cap is slidably connected to the outer side of the filling groove.

[0007] A valve seat is fixedly connected to the inner wall of the connecting pipe, and the valve seat fits against the valve disc when the valve is closed.

[0008] Limiting holes are provided at the head positions of the main spindle and the secondary spindle.

[0009] The slot has a pin hole near the middle of the valve shaft, and a cylindrical pin is inserted into the pin hole and the limiting hole.

[0010] The sealing element is fixedly connected to the packing gland by bolts, the packing gland passes through the bolts, and a nut is provided on the outside of the bolts.

[0011] This utility model has at least the following beneficial effects:

[0012] In use, the valve body and valve plate of this utility model are all welded from steel plates, which has the advantages of low cost, short production cycle and fast delivery. The two sides of the welded valve disc are connected by the main shaft and the auxiliary shaft. Bearings are installed on the outside of the valve body, which greatly reduces the valve's opening and closing torque and reduces the probability of the valve shaft seizing during operation. At the same time, it reduces wear and extends service life, giving the butterfly valve the advantages of low torque and long service life. In addition, the external bearing structure eliminates the need to disassemble the valve body components, making on-site maintenance convenient. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the front structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the front cross-sectional structure of the present invention;

[0016] Figure 4 This is an enlarged structural diagram of section A of the present invention;

[0017] Figure 5 This is a schematic diagram of the sealing component of this utility model;

[0018] Figure 6 This is a schematic diagram of the cross-sectional structure of the left side of this utility model;

[0019] Figure 7 This is a schematic diagram of the welded raft plate structure of this utility model;

[0020] In the diagram: 1. Connecting pipe; 11. Valve seat; 2. Flange; 3. Welded raft plate; 31. Valve shaft; 32. Valve disc; 33. Slot; 34. Pin hole; 35. Cylindrical pin; 36. Reinforcing rib; 4. Seal; 41. Filling groove; 42. Packing; 43. Packing gland; 44. Bolt; 45. Nut; 5. Thrust ring; 6. Fixing sleeve; 7. Main shaft; 71. Limiting hole; 8. Secondary shaft. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1

[0023] Please see Figures 1 to 6This utility model provides a technical solution: a large-diameter, low-pressure, fully welded flange butterfly valve, including a connecting pipe 1, with flanges 2 fixedly connected to both ends of the connecting pipe 1 for connection to pipelines. A welded raft plate 3 is provided in the middle of the connecting pipe 1, serving to regulate and control the fluid. The welded raft plate 3 adopts a centerline butterfly valve type, which can make the stress generated by welding more uniform, and the force on the valve disc 32 and valve shaft 31 can be evenly transmitted to the sealing surface of the valve seat 11, making the shaft less prone to deflection or jamming. Simultaneously, the valve body adopts a completely symmetrical design, ensuring good sealing performance between the valve plate and valve seat. The butterfly valve has excellent regulating performance and is easy to position during processing. No strict directional requirements are needed during assembly. The inner wall of the connecting pipe 1 is fixed... A valve seat 11 is fixedly connected to the valve disc 32. When the valve disc 32 is closed, the valve seat 11 fits against it to improve the sealing effect. Sealing elements 4 are fixedly connected to the outer wall of the connecting pipe 1 on both sides of the welded raft plate 3. A filling groove 41 is opened on the inner side of the sealing element 4, and packing 42 is filled inside the filling groove 41. The packing 42 can enhance the sealing performance. A packing gland 43 is slidably connected to the outer side of the filling groove 41. The packing gland 43 can adjust the tightness of the seal to prevent leakage. A bolt 44 is fixedly connected to the sealing element 4 near the packing gland 43. The packing gland 43 passes through the bolt 44. A nut 45 is provided on the outer side of the bolt 44. These are located on the outer walls of the connecting pipes on both sides of the welded raft plate 3 to prevent fluid leakage. The inner wall of the connecting pipe 1 is fixedly connected to the outer wall of the connecting pipe on both sides of the welded raft plate 3. A thrust ring 5 is fixedly connected to prevent axial movement of the main shaft 7 and the auxiliary shaft 8. A fixing sleeve 6 is fixedly connected to the outside of the seals 4 on both sides of the connecting pipe 1 to further fix the main shaft 7 and the auxiliary shaft 8. The main shaft 7 passes through one side of the connecting pipe 1, and the auxiliary shaft 8 passes through the other side. The main shaft 7 and the auxiliary shaft 8 pass through the fixing sleeves 6, seals 4, and thrust ring 5 on both sides of the connecting pipe 1 and are inserted into both sides of the welded raft plate 3. The welded raft plate 3 includes a valve shaft 31, with valve discs 32 integrally welded to both sides of the valve shaft 31. Slots 33 are opened at both ends of the valve shaft 31. Limiting holes 71 are opened at the heads of the main shaft 7 and the auxiliary shaft 8. A pin hole 34 is opened in the slot 33 near the middle of the valve shaft 31. The pin hole 34 and the limiting hole... A cylindrical pin 35 is inserted inside the valve body 71, allowing the main shaft 7 and the auxiliary shaft 8 to be connected to the welded raft plate 3 via an external insertion method. The main shaft 7 is used to drive the welded valve plate 3 to rotate to achieve the adjustment function, while the auxiliary shaft 8 provides partial rotational support for the welded raft plate 3. The structure of installing bearings on the outside of the valve body greatly reduces the valve's opening and closing torque and the probability of the butterfly valve's shaft seizing during operation. The external bearing structure also eliminates the need to disassemble the valve body assembly, facilitating on-site maintenance. At the same time, it reduces wear and extends service life, giving the butterfly valve the advantages of low torque and long service life, making it especially suitable for high-temperature applications. The welded butterfly valve body and valve plate are all welded from steel plates, offering advantages such as low cost, short production cycle, and rapid delivery.

[0024] Example 2

[0025] Please see Figure 7In this second embodiment, the other structures remain unchanged. The difference from the first embodiment is that both the left and right sides of the figure are welded raft plates 3. The welded raft plate 3 on the right side has a DN≤400 structure, and the welded raft plate 3 on the left side has a DN>400 structure. Compared with the welded raft plate 3 on the right side, the welded raft plate 3 on the left side has reinforcing ribs 36 welded integrally on both sides. By welding the reinforcing ribs 36, the force on the welded raft plate 3 can be more evenly transmitted to the sealing surface with the valve seat 11 when the diameter increases, thereby improving the stress resistance and sealing effect of the welded valve 3 under large diameter.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A large-diameter, low-pressure, fully welded flanged butterfly valve, comprising a connecting pipe (1), characterized in that: The connecting pipe (1) is fixedly connected to flanges (2) at both ends. The connecting pipe (1) is provided with a welded raft plate (3) in the middle. The outer wall of the connecting pipe (1) is fixedly connected to the two sides of the welded raft plate (3). The inner wall of the connecting pipe (1) is fixedly connected to the two sides of the welded raft plate (3). The connecting pipe (1) is fixedly connected to the outer side of the two seals (4) on both sides with fixed sleeves (6). A main shaft (7) passes through one side of the connecting pipe (1), and a secondary shaft (8) passes through the other side of the connecting pipe (1). The main shaft (7) and the secondary shaft (8) pass through the fixed sleeves (6), seals (4), and thrust rings (5) on both sides of the connecting pipe (1) and are inserted into the two sides of the welded raft plate (3).

2. The large-diameter low-pressure fully welded flange butterfly valve according to claim 1, characterized in that: The welded raft plate (3) includes a valve shaft (31), on both sides of the valve shaft (31) are integrally welded valve discs (32), and slots (33) are opened at both ends of the valve shaft (31).

3. The large-diameter low-pressure fully welded flange butterfly valve according to claim 1, characterized in that: The sealing element (4) has a filling groove (41) on its inner side, and the filling groove (41) is filled with filler (42). A filler cap (43) is slidably connected to the outer side of the filling groove (41).

4. The large-diameter low-pressure fully welded flange butterfly valve according to claim 1, characterized in that: A valve seat (11) is fixedly connected to the inner wall of the connecting pipe (1), and the valve seat (11) fits against the valve disc (32) when it is closed.

5. The large-diameter low-pressure fully welded flange butterfly valve according to claim 2, characterized in that: Limiting holes (71) are provided at the head positions of the main shaft (7) and the secondary shaft (8).

6. The large-diameter low-pressure fully welded flange butterfly valve according to claim 5, characterized in that: The slot (33) has a pin hole (34) located near the middle of the valve shaft (31), and a cylindrical pin (35) is inserted into the pin hole (34) and the limiting hole (71).

7. The large-diameter low-pressure fully welded flange butterfly valve according to claim 3, characterized in that: The seal (4) is fixedly connected to the packing gland (43) by a bolt (44), the packing gland (43) passes through the bolt (44), and a nut (45) is provided on the outside of the bolt (44).

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