Pneumatic expansion butterfly valve

Abstract

Annular grooves are formed in the two ends of a valve body, a pneumatic actuator is arranged on the upper surface of the valve body through a connecting base, guide sleeves are arranged at the top end and the bottom end in the valve body, an output shaft of the pneumatic actuator is connected with the top end of a main shaft in a matched mode, and outer folding edges are arranged at the two ends of a rubber air bag. Round holes in the top and the bottom of the rubber air bag are connected with guide sleeves on the inner side of the valve body in a matched mode, the rubber air bag is arranged in the valve body, the outer folded edges are arranged in annular grooves in the two ends of the valve body, the round valve plate is rotationally arranged in the valve body through a main shaft, and the two limiting flanges are arranged at the two ends of the valve body through bolts respectively. The rubber air bag is reasonable in structure, pressing and fixing of the outer folded edges at the two ends of the rubber air bag are achieved through the limiting flanges, the air tightness of the rubber air bag is greatly improved, meanwhile, the rubber air bag is provided with a round hole and matched with a guide sleeve, and direct friction between the main shaft and the rubber air bag during rotation is avoided. The service life of the rubber airbag is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a pneumatic expansion butterfly valve. Background Art

[0002] As an advanced fluid control device, the pneumatic expansion butterfly valve plays a vital role in the pipeline system due to its performance and reliability. The valve uses compressed air as the power source, and controls the opening and closing of the valve plate through the pneumatic actuator to achieve the regulation of the fluid in the pipeline. The valve plate of the butterfly valve is usually circular, and its center coincides with the axis of the valve stem. The valve stem can be rotated 90 degrees, so that the valve plate is fully opened or closed in the pipeline to achieve the circulation or cutoff of the fluid. The pneumatic expansion butterfly valve adopts airbag sealing technology to ensure that it can provide a good sealing effect when the valve is closed to prevent fluid leakage.

[0003] At present, the rubber airbag in the pneumatic expansion butterfly valve is directly sleeved on the inner wall of the valve body. When in use, the rubber airbag has poor stability and is prone to leakage when the air pressure is slightly high. In addition, the existing rubber airbag is in direct contact with the main shaft, and the connection between the main shaft and the airbag often rubs, resulting in a decrease in service life. Therefore, an improved technology is urgently needed to solve the above problems existing in the prior art. Utility Model Content

[0004] The utility model aims to provide a pneumatic expansion butterfly valve, annular grooves are provided at both ends of the valve body, outer folded edges at both ends of the rubber airbag are arranged in the annular grooves, limiting flanges are installed at both ends of the valve body by bolts, the bolts also pass through the outer folded edges of the rubber airbag, and the outer folded edges at both ends of the rubber airbag are pressed and fixed by the limiting flanges, the airtightness of the rubber airbag is greatly improved, and the outer folded edges are limited by bolts, which greatly improves the stability of the rubber airbag when in use, and at the same time, guide sleeves are provided on the top and bottom of the valve body, and the rubber airbag is provided with round holes and cooperates with the guide sleeves, which ensures the sealing while avoiding direct friction between the main shaft and the rubber airbag when rotating, thereby improving the service life of the rubber airbag, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pneumatic expansion butterfly valve, comprising a valve body, a pneumatic actuator, a main shaft, a rubber airbag, a circular valve plate and a limit flange, the valve body is cylindrical, annular grooves are provided at both ends of the valve body, a connecting seat is provided on the upper surface of the valve body, air pipe interfaces are provided on both sides of the valve body, guide sleeves are provided at the top and bottom ends of the valve body, a pneumatic actuator is provided on the upper surface of the connecting seat, and the output shaft of the pneumatic actuator is matched and connected with the top end of the main shaft;

[0006] The rubber airbag is a cylindrical structure, and outer folding edges are provided at both ends of the rubber airbag. Round holes are provided at the top and bottom of the rubber airbag. The two round holes are respectively located at the two ends of a diameter passing through the axial midpoint of the rubber airbag. The round holes of the rubber airbag are matched and connected with the guide sleeve inside the valve body. The rubber airbag is arranged inside the valve body, and the outer folding edges are arranged in the annular grooves at both ends of the valve body.

[0007] The circular valve plate is provided with a sleeve along the radial direction, the main shaft passes through the sleeve connecting the seat, the guide sleeve and the circular valve plate, the main shaft is connected to the sleeve by screws, and the circular valve plate is rotatably arranged in the valve body;

[0008] There are two limit flanges, which are respectively arranged at two ends of the valve body by bolts. The limit flanges are pressed on the outer surface of the outer folded edge, and the bolts pass through the outer folded edge corresponding to the rubber airbag.

[0009] Preferably, the utility model provides a pneumatic expansion butterfly valve, wherein the limiting flange is an annular structure, and the inner diameter of the limiting flange matches the inner diameter of the rubber airbag.

[0010] Preferably, the utility model provides a pneumatic expansion butterfly valve, wherein the limit flange is provided with a countersunk hole and a connecting hole in the shape of a ring, the outer folding edge is provided with a through hole in the shape of a ring, and the valve body is located in an annular groove and is provided with a screw hole in the shape of a ring, and the countersunk hole of the limit flange, the through hole of the outer folding edge and the screw hole of the valve body correspond to each other one by one and are connected by bolts.

[0011] Preferably, the utility model provides a pneumatic expansion butterfly valve, wherein the inner diameter of the annular groove and the outer diameter of the outer fold are consistent.

[0012] Preferably, the utility model provides a pneumatic expansion butterfly valve, wherein the rubber airbag is provided with a thickened protrusion at the circular hole.

[0013] Preferably, the utility model provides a pneumatic expansion butterfly valve, wherein an airway is provided through the valve body at the air pipe interface.

[0014] Preferably, the utility model provides a pneumatic expansion butterfly valve, wherein a square rod is provided at the top end of the main shaft.

[0015] Preferably, the utility model provides a pneumatic expansion butterfly valve, wherein a solenoid valve is further provided on one side of the pneumatic actuator.

[0016] Preferably, the utility model provides a pneumatic expansion butterfly valve, wherein the thickness of the outer folded edge is greater than the depth of the annular groove in the axial direction of the valve body 1 .

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] (1) Annular grooves are provided at both ends of the valve body, and outer folding edges are provided at both ends of the rubber airbag. The outer folding edges are arranged in the annular grooves. The limiting flanges are installed at both ends of the valve body by bolts. The bolts also pass through the outer folding edges of the rubber airbag. The outer folding edges at both ends of the rubber airbag are pressed and fixed by the limiting flanges. The airtightness of the rubber airbag is greatly improved. The outer folding edges are limited by bolts, which greatly improves the stability of the rubber airbag during use.

[0019] (2) Guide sleeves are provided at the top and bottom of the valve body, and the rubber airbag is provided with a round hole and cooperates with the guide sleeve to ensure the sealing performance while avoiding direct friction between the main shaft and the rubber airbag when the main shaft rotates, thereby increasing the service life of the rubber airbag. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the side cross-sectional structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the side view of the appearance structure of the utility model;

[0022] Figure 3 This is a schematic diagram of the front view structure of the utility model;

[0023] Figure 4 Schematic diagram of valve seat structure;

[0024] Figure 5 It is a schematic diagram of the side cross-sectional structure of the rubber airbag;

[0025] Figure 6 It is a schematic diagram of the front view structure of the rubber airbag;

[0026] Figure 7 This is a schematic diagram of the main axis structure.

[0027] In the figure: valve body 1, pneumatic actuator 2, main shaft 3, rubber airbag 4, circular valve plate 5, limit flange 6, annular groove 7, connecting seat 8, air pipe interface 9, guide sleeve 10, outer folded edge 11, round hole 12, sleeve 13, bolt 14, countersunk hole 15, connecting hole 16, through hole 17, screw hole 18, thickened protrusion 19, air duct 20, square rod 21, solenoid valve 22. DETAILED DESCRIPTION

[0028] The following will combine the embodiments and drawings of the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model;

[0029] It should be noted that, in the description of the present invention, the terms "inside", "outside", "upper", "lower", "both sides", "one end", "the other end", "left" and "right" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0030] See also Figure 1-7 The utility model provides a technical solution: a pneumatic expansion butterfly valve, including a valve body 1, a pneumatic actuator 2, a main shaft 3, a rubber airbag 4, a circular valve plate 5 and a limit flange 6. The valve body 1 is cylindrical, and annular grooves 7 are provided at both ends of the valve body 1. A connecting seat 8 is provided on the upper surface of the valve body 1. Air pipe interfaces 9 are provided on both sides of the valve body 1. An airway 20 is provided through the valve body 1 at the air pipe interface 9 to enable gas to enter between the rubber airbag 4 and the valve body 1 through the airway 20. Guide sleeves 10 are provided at the top and bottom of the valve body 1. A pneumatic actuator 2 is provided on the upper surface of the connecting seat 8. The output shaft of the pneumatic actuator 2 is connected with the top of the main shaft 3. A square rod 21 is provided at the top of the main shaft 3 to achieve direct connection with the square hole on the output shaft of the pneumatic actuator 2. A solenoid valve 22 is also provided on one side of the pneumatic actuator 2. The solenoid valve 22 is used to switch the air path. The main shaft 3 is perpendicular to the axial direction of the valve body 1.

[0031] The rubber airbag 4 is a cylindrical structure, and outer folding edges 11 are provided at both ends of the rubber airbag 4. Round holes 12 are provided at the top and bottom of the rubber airbag 4. The two round holes 12 are respectively located at the two ends of a diameter passing through the axial midpoint of the rubber airbag 4. The round hole 12 of the rubber airbag 4 is connected with the guide sleeve 10 on the inner side of the valve body 1. The rubber airbag 4 is provided with a thickened protrusion 19 at the round hole 12 to ensure the strength of the rubber airbag 4 at the round hole 12 to avoid leakage due to excessive thinness. The rubber airbag 4 is arranged inside the valve body 1, and the outer folding edges 11 are arranged in the annular grooves 7 at both ends of the valve body 1. The inner diameter of the annular groove 7 is consistent with the outer diameter of the outer folding edge 11 to ensure the stability of the outer folding edge 11 when it is located in the annular groove 7.

[0032] The circular valve plate 5 is provided with a sleeve 13 in the radial direction, the main shaft 3 passes through the connecting seat 8, the guide sleeve 10 and the sleeve 13 of the circular valve plate 5, the main shaft 3 is connected to the sleeve 13 by screws, and the circular valve plate 5 is rotatably arranged in the valve body 1;

[0033] There are two limit flanges 6 and they are respectively arranged at both ends of the valve body 1 by bolts 14. The limit flanges 6 are pressed on the outer surface of the outer fold 11. The thickness of the outer fold 6 is greater than the depth of the annular groove 7 in the axial direction of the valve body 1. When the limit flange 6 is pressed on the outer surface of the outer fold 11, the friction force prevents the outer fold 11 from sliding easily. The bolts 14 pass through the outer fold 11 corresponding to the rubber airbag 4. The limit flange 6 is annularly provided with a countersunk hole 15 and a connecting hole 16. The outer fold 11 is annularly provided with Through hole 17, the valve body 1 is located in the annular groove 7 and has a screw hole 18 in the shape of an annular hole. The countersunk hole 15 of the limiting flange 6, the through hole 17 of the outer folded edge 11 and the screw hole 18 of the valve body 1 correspond to each other and are connected by bolts 14. This structure is used to fix the limiting flange 6 and the outer folded edge 11 to ensure that the rubber airbag 4 will not loosen easily during use, thereby ensuring the sealing of the rubber airbag 14. The limiting flange 6 is an annular structure, and the inner diameter of the limiting flange 6 matches the inner diameter of the rubber airbag 4.

[0034] Assembly method and use principle: First, put the rubber airbag 4 on the inner wall of the valve body 1, and put the circular hole 12 of the rubber airbag 4 on the guide sleeve 10 of the valve body 1. At this time, the outer folded edges 11 at both ends of the rubber airbag 4 are just located in the annular grooves 7 at both ends of the valve body 1, and the through holes 17 of the outer folded edges 11 correspond to the screw holes 18 at the annular groove 7. Then, the countersunk holes 15 of the limiting flange 6 correspond to the through holes 17 of the outer folded edges 11, and the bolts 14 are passed through the countersunk holes 15 of the limiting flange 6 and the through holes 17 of the outer folded edges 11 in sequence and are threadedly connected with the screw holes 18 at the annular groove 7 until the limiting flange 6 is fastened and installed at both ends of the valve body 1. At this time, the outer folded edges 11 of the rubber airbag 4 are limited by the bolts 14 and pressed into the annular groove 7. The inner wall of the valve body 1 and the outer wall of the rubber airbag 4 cooperate to form an air chamber. Then, the circular valve plate 5 is placed in the valve body 1, and the sleeve 13 is respectively corresponding to the sleeve 13 at the top and bottom of the valve body 1, and then the main shaft 3 passes through the connecting seat 8 and the guide sleeve 10 at the top, and passes through the sleeve 13 of the circular valve plate 5 and the bottom is inserted into the guide sleeve 10 at the bottom of the valve body 1, and then the circular valve plate 5 is fastened to the main shaft 3 by screws, and finally the pneumatic actuator 2 is installed on the upper surface of the connecting seat 8, and the output shaft at the bottom of the starting actuator is a square hole structure, which is just matched and connected with the square hole at the top of the main shaft 3 to complete the assembly. When in use, the main shaft 3 is driven to rotate by the pneumatic actuator 2, thereby driving the circular valve plate 5 to rotate. When the circular valve plate 5 is closed, the gas enters the air chamber between the inner wall of the valve body 1 and the outer wall of the rubber airbag 4 through the solenoid valve 22, the air pipe interface 9 and the airway 20, and the rubber airbag 4 is arched inward, so that the circular valve plate 5 is directly and tightly connected with the rubber airbag 4. When the valve is opened, the gas is discharged first, and the rubber airbag 4 is separated from the edge of the circular valve plate 5, and then the main shaft 3 and the circular valve plate 5 are driven to rotate by the pneumatic actuator 2 to realize the opening of the valve. The utility model has a reasonable structure, an annular groove 7 is provided at both ends of the valve body 1, and an outer folding edge 11 is provided at both ends of the rubber airbag 4, and the outer folding edge 11 is arranged in the annular groove 7. The limiting flange 6 is installed at both ends of the valve body 1 through the bolt 14, and the bolt 14 also passes through the outer folding edge 11 of the rubber airbag 4. The outer folding edge 11 at both ends of the rubber airbag 4 is pressed and fixed by the limiting flange 6, and the air tightness of the rubber airbag 4 is greatly improved. The outer folding edge 11 is limited by the bolt 14, which greatly improves the stability of the rubber airbag 4 when in use. At the same time, the top and bottom of the valve body 1 are provided with a guide sleeve 10, and the rubber airbag 4 is provided with a circular hole 12 and cooperates with the guide sleeve 10, which ensures the sealing performance while avoiding direct friction between the main shaft 3 and the rubber airbag 4 when rotating, thereby improving the service life of the rubber airbag 4.

[0035] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

[0036] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified and replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A pneumatic expansion butterfly valve, characterized in that: The invention comprises a valve body (1), a pneumatic actuator (2), a main shaft (3), a rubber airbag (4), a circular valve plate (5) and a limit flange (6); the valve body (1) is cylindrical, annular grooves (7) are provided at both ends of the valve body (1), a connecting seat (8) is provided on the upper surface of the valve body (1), air pipe interfaces (9) are provided on both sides of the valve body (1), guide sleeves (10) are provided at the top and bottom ends of the valve body (1), a pneumatic actuator (2) is provided on the upper surface of the connecting seat (8), and the output shaft of the pneumatic actuator (2) is connected to the top end of the main shaft (3); The rubber airbag (4) is a cylindrical structure, and outer folded edges (11) are provided at both ends of the rubber airbag (4). Round holes (12) are provided at the top and bottom of the rubber airbag (4). The two round holes (12) are respectively located at the two ends of a diameter passing through the axial midpoint of the rubber airbag (4). The round hole (12) of the rubber airbag (4) is matched and connected with the guide sleeve (10) on the inner side of the valve body (1). The rubber airbag (4) is arranged inside the valve body (1), and the outer folded edges (11) are arranged in the annular grooves (7) at both ends of the valve body (1). The circular valve plate (5) is provided with a sleeve (13) in the radial direction, the main shaft (3) passes through the connecting seat (8), the guide sleeve (10) and the sleeve (13) of the circular valve plate (5), the main shaft (3) is connected to the sleeve (13) by screws, and the circular valve plate (5) is rotatably arranged in the valve body (1); There are two limit flanges (6) which are respectively arranged at both ends of the valve body (1) through bolts (14); the limit flanges (6) are pressed on the outer surface of the outer folding edge (11); and the bolts (14) pass through the outer folding edge (11) corresponding to the rubber airbag (4).

2. A pneumatic expansion butterfly valve according to claim 1, characterized in that: The limiting flange (6) is an annular structure, and the inner diameter of the limiting flange (6) matches the inner diameter of the rubber airbag (4).

3. A pneumatic expansion butterfly valve according to claim 1, characterized in that: The limiting flange (6) is provided with a countersunk hole (15) and a connecting hole (16) in the shape of an annular ring, the outer folding edge (11) is provided with a through hole (17) in the shape of an annular ring, and the valve body (1) is provided with a screw hole (18) in the shape of an annular ring in the annular groove (7). The countersunk hole (15) of the limiting flange (6), the through hole (17) of the outer folding edge (11) and the screw hole (18) of the valve body (1) correspond to each other and are connected by bolts (14).

4. A pneumatic expansion butterfly valve according to claim 1, characterized in that: The inner diameter of the annular groove (7) and the outer diameter of the outer fold (11) are consistent.

5. A pneumatic expansion butterfly valve according to claim 1, characterized in that: The rubber airbag (4) is provided with a thickened protrusion (19) at the circular hole (12).

6. A pneumatic expansion butterfly valve according to claim 1, characterized in that: The valve body (1) is provided with an air passage (20) extending through the air pipe interface (9).

7. A pneumatic expansion butterfly valve according to claim 1, characterized in that: A square rod (21) is arranged at the top end of the main shaft (3).

8. The pneumatic expansion butterfly valve according to claim 1, characterized in that: A solenoid valve (22) is also provided on one side of the pneumatic actuator (2).

9. The pneumatic expansion butterfly valve according to claim 1, characterized in that: The thickness of the outer folded edge (11) is greater than the depth of the annular groove (7) in the axial direction of the valve body (1).

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