Knife gate valve with suction and exhaust functions

Abstract

The present application relates to the technical field of pneumatic knife gate valves, and provides a knife gate valve with suction and exhaust functions, including a valve body, a valve seat, a pneumatic mechanism and an inflation sealing mechanism, flange mounting plates are respectively provided at both ends of the valve body, a sealing filler is provided on the valve body, a gate plate is provided in the valve body, a group of mounting plates are provided on the outer wall of the valve body, a plurality of mounting rods are provided on the mounting plate, the gate plate is located between the group of mounting plates, and a valve stem is fixedly connected to the top of the gate plate; the pneumatic mechanism is arranged above the group of mounting plates, and the valve stem is fixedly connected to the pneumatic mechanism; the inflation sealing mechanism is arranged at the bottom of the valve body; the present application realizes rapid closure of the knife gate valve by accelerating the suction of gas in the upper and lower sealing cavities through suction and exhaust under the cooperation of an air source, a double-control solenoid valve and a first suction mechanism, and can realize rapid opening and closing in an emergency; at the same time, the flexible metal seal adapts to the movement caused by fluctuations in the circulation pipeline to maintain an effective seal.

Description

Technical Field

[0001] The present application relates to the technical field of pneumatic knife gate valves, and in particular to a knife gate valve with suction and exhaust functions. Background Art

[0002] Knife gate valve is also called knife-type gate valve, knife gate valve, slurry valve, mud valve. Its opening and closing parts are gates. The movement direction of the gate is perpendicular to the direction of the fluid. The medium is cut off by the blade-shaped gate that can cut fiber materials. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used mode gate valve form a wedge shape. The wedge angle varies with the valve parameters. The knife gate valve has a small installation space, low working pressure, is not easy to accumulate debris, and has a high cost performance.

[0003] Referring to the Chinese patent application with publication number CN111237490B, a zero leakage knife gate valve is disclosed. The zero leakage knife gate valve is provided with a wedge groove, an arc wedge block and a valve plate. As the valve plate slides left and right, the wedge groove contacts the wedge block to enable the valve plate to slide up and down. At the same time, the arc wedge block also contacts the wedge angle to enable the valve plate to slide up and down. The valve plate slides upward at both ends of the valve plate at the same time, so that the movement of the valve plate is more stable, and the device has the function of being able to achieve high performance and no leakage more stably.

[0004] Referring to the Chinese patent application with publication number CN109723847B, a knife gate valve is disclosed, wherein the valve seat sealing ring has a certain elasticity, contacts with the gate plate, plays a sealing role, can fix the valve seat, and can adjust the interference of the valve seat sealing ring;

[0005] However, there are the following problems in the prior art:

[0006] 1. The installation and use process of the existing large knife gate valve. Due to the large size of the knife gate valve, only the existing manual, electric or unidirectional pneumatic methods are used, which has a slow opening and closing speed and a long opening and closing time. It is impossible to achieve rapid opening and closing when it needs to be opened and closed in an emergency;

[0007] 2. Friction is unavoidable when the valve plate of the existing knife gate valve opens and closes the valve. The metal hard seal between the gate plate and the valve seat causes great wear. Usually, a soft seal is used between the gate plate and the valve seat, which requires regular replacement of the soft seal, which is cumbersome.

[0008] For this purpose, we designed a knife gate valve with suction and exhaust functions.

[0009] Contents of this application

[0010] The knife gate valve with suction and exhaust functions provided in the embodiment of the present application can achieve rapid closing of the knife gate valve, and the closing time is shorter than that of the existing large knife gate valve. In an emergency, it can achieve rapid opening and closing, reduce the friction between the gate plate and the valve seat during the opening and closing process, and reduce the technical problem of regular replacement frequency of soft seals.

[0011] The embodiment of the present application provides a knife gate valve with suction and exhaust functions, comprising: a valve body, a valve seat, a pneumatic mechanism and an inflatable sealing mechanism, wherein flange mounting plates are respectively provided at both ends of the valve body, a sealing filler is provided on the valve body, a gate is provided in the valve body, a group of mounting plates are provided on the outer side wall of the valve body, a plurality of mounting rods are provided on the mounting plate, the gate is located between the group of mounting plates, and a valve stem is fixedly connected to the top of the gate;

[0012] A pneumatic mechanism, wherein the pneumatic mechanism is arranged above a set of mounting plates, the valve stem is fixedly connected to the pneumatic mechanism, and the pneumatic mechanism comprises a double-control solenoid valve for realizing rapid opening and closing of the gate plate on the valve body;

[0013] An inflatable sealing mechanism, which is arranged at the bottom of the valve body and includes a plurality of extrusion sealing airbags for reducing the friction between the gate and the valve seat during opening and closing and improving the sealing performance between the valve seat and the gate;

[0014] The above technical solutions in the embodiments of the present application have at least the following technical effects:

[0015] 1. In the present application, with the cooperation of the air source, the double-control solenoid valve and the first suction mechanism, the suction of the gas in the upper and lower sealing cavities is accelerated by suction and exhaust, so as to realize the rapid closing of the knife gate valve. The closing time is shorter than that of the existing large knife gate valve, and rapid opening and closing can be achieved in an emergency. At the same time, the flexible metal seal adapts to the movement caused by the fluctuation in the circulation pipeline to maintain an effective seal.

[0016] 2. In the present application, there is no friction between the sealing airbag and the gate plate during the opening and closing process of the valve, and the airbag is inflated and sealed when the gate plate is closed, so the sealing effect is better. The air source, the double-control solenoid valve, and the first suction mechanism and the second suction mechanism are controlled by the control panel to make working responses, thereby realizing automatic control of the pneumatic knife gate valve, and the operation is simple and convenient.

[0017] In this embodiment, the pneumatic mechanism further includes:

[0018] A cylinder body, an air source, an air delivery pipe, a first air inlet pipe and a second air inlet pipe; the cylinder body is fixedly mounted on a set of mounting plates through a plurality of mounting rods, a piston is movable in the cylinder body, the piston divides the cylinder body into an upper sealing chamber and a lower sealing chamber, and the air source and the double-control solenoid valve are respectively arranged on both sides of the cylinder body;

[0019] One end of the double-control solenoid valve is provided with an air inlet, and the other end is provided with a first air delivery port and a second air delivery port, the two sides of the air inlet are respectively provided with a second exhaust port and a first exhaust port, the valve body is provided with a first coil and a second coil, an air inlet chamber, a first connecting chamber and a second connecting chamber are provided in the double-control solenoid valve, the air inlet chamber is arranged between the first connecting chamber and the second connecting chamber, a valve core is provided in the double-control solenoid valve, the valve core moves in the air inlet chamber, the first connecting chamber and the second connecting chamber, and the second exhaust port and the first exhaust port are both connected with a first suction mechanism;

[0020] The gas source is connected to the air inlet of the double-control solenoid valve through the air supply pipe, and the first air supply port and the second air supply port are respectively connected to the upper sealing cavity and the lower sealing cavity of the cylinder body through the first air supply pipe and the second air supply pipe.

[0021] In this embodiment, the valve seat is U-shaped, a cutting groove is provided on the valve seat, a group of sealing seats are symmetrically provided at both ends of the valve seat, an O-ring is provided between the sealing seat and the valve body, and a flexible metal seal is provided at the end of the sealing seat away from the valve seat.

[0022] In this embodiment, a group of mounting grooves are provided in the valve seat, the extrusion sealing airbag is arranged in the cutting groove, and the extrusion sealing airbag blocks the mounting grooves.

[0023] In this embodiment, the inflatable sealing mechanism further includes:

[0024] An air storage cylinder, a group of air intake connecting pipes, a communicating air pipe, a plurality of communicating air cylinders and a group of communicating pipes, wherein the air storage cylinder is arranged at the bottom of the valve body, the plurality of communicating air cylinders are evenly arranged in a group of mounting grooves, and the plurality of communicating air cylinders in the same mounting groove are connected through the communicating pipes, and the air storage cylinder is connected to one of the communicating air cylinders through the air intake connecting pipe;

[0025] An air blowing port is arranged at one end of the communicating air cylinder close to the extrusion sealing airbag, the communicating air pipe is connected with the air storage cylinder, and a second suction mechanism is arranged at one end of the communicating air pipe away from the air storage cylinder.

[0026] In this embodiment, a fastening and mounting mechanism is provided on the outer side wall of the flange mounting plate, and the fastening and mounting mechanism comprises: a first clamping ring, a second clamping ring, a fastening groove, a rotating shaft, a rotating member, a bolt and a rotating nut;

[0027] The first clamp ring and the second clamp ring are both arranged in a semicircular ring shape, and are rotatably connected via a rotating shaft, and the first clamp ring and the second clamp ring are both provided with mounting connection grooves at one end away from the rotating shaft, and the rotating member is arranged in the mounting connection groove of the first clamp ring, and the rotating member is rotatably connected to the first clamp ring, the rotating member is coaxially fixedly connected to the bolt, and the rotating nut is threadedly connected to the bolt.

[0028] In this embodiment, a rubber sealing ring is provided between the outer wall of the piston and the inner wall of the cylinder.

[0029] In this embodiment, a control board is provided on the mounting plate, a protruding rod is provided on the valve stem, a group of proximity switches are provided on the mounting plate, the protruding rod is arranged between the group of proximity switches, and the control board is connected to the proximity switches by electrical signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 A schematic diagram of the overall installation structure of a knife gate valve with suction and exhaust functions provided in an embodiment of the present application;

[0032] Figure 2 A schematic diagram of the overall structure of a knife gate valve with suction and exhaust functions provided in an embodiment of the present application from another perspective;

[0033] Figure 3 Schematic diagram of the internal structure of the valve body of the knife gate valve with suction and exhaust functions provided in the embodiment of the present application Figure 1 ;

[0034] Figure 4 for Figure 3 The enlarged schematic diagram of the middle A part;

[0035] Figure 5 Schematic diagram of the internal structure of the valve body of the knife gate valve with suction and exhaust functions provided in the embodiment of the present application Figure 2 ;

[0036] Figure 6 for Figure 5 The enlarged schematic diagram of the middle part B;

[0037] Figure 7 A schematic diagram of the internal structure of the cylinder of a knife gate valve with suction and exhaust functions provided in an embodiment of the present application;

[0038] Figure 8 A schematic diagram of the internal structure of a double-control solenoid valve controlling the output state of a cylinder in a knife gate valve with suction and exhaust functions provided in an embodiment of the present application;

[0039] Fig. 9 A schematic diagram of the internal structure of the double-control solenoid valve in the knife gate valve with suction and exhaust functions provided in the embodiment of the present application to control the cylinder contraction state;

[0040] Fig.10 A schematic diagram of the valve seat structure of a knife gate valve with suction and exhaust functions provided in an embodiment of the present application;

[0041] Fig.11 A schematic diagram of the internal structure of the valve seat of a knife gate valve with suction and exhaust functions provided in an embodiment of the present application;

[0042] Fig.12 A schematic diagram of an inflation sealing mechanism of a knife gate valve with suction and exhaust functions provided in an embodiment of the present application;

[0043] Fig.13 Schematic diagram of the fastening and installation mechanism of the knife gate valve with suction and exhaust functions provided in an embodiment of the present application.

[0044] Among them, the reference numerals in the figure are:

[0045] 1. Valve body; 11. Flange mounting plate; 12. Sealing filler; 13. Mounting plate; 14. Mounting rod;

[0046] 2. Valve seat; 21. Cutting groove; 211. Mounting groove; 212. Extrusion sealing airbag; 22. Sealing seat; 23. Flexible metal sealing element; 24. O-ring;

[0047] 3. gate; 31. valve stem; 311. convex rod;

[0048] 4. Cylinder body; 41. Gas source; 411. Gas pipe; 4111. Gas inlet; 42. Double-control solenoid valve; 421. First gas inlet pipe; 4211. First gas inlet; 422. Second gas inlet pipe; 4221. Second gas inlet; 423. First coil; 424. Second coil; 425. Second exhaust port; 426. First exhaust port; 427. Gas inlet cavity; 4271. First connecting cavity; 4272. Second connecting cavity; 428. Valve core; 43. Upper sealing cavity; 44. Lower sealing cavity; 45. Piston;

[0049] 5. Air storage cylinder; 51. Air inlet connecting pipe; 52. Air connecting pipe; 53. Air connecting cylinder; 531. Air blowing port; 54. Connecting pipe;

[0050] 6. First clamping ring; 61. Second clamping ring; 611. Fastening groove; 62. Rotating shaft; 63. Rotating member; 64. Bolt; 65. Rotating nut; 7. Proximity switch. DETAILED DESCRIPTION

[0051] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0053] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0054] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0056] It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0057] Based on this, in order to improve the problem in the related technology that due to the large size of the knife gate valve, only by adopting the existing manual, electric or unidirectional pneumatic methods, the opening and closing speed of the knife gate valve is slow, the opening and closing time is long, and it is impossible to achieve quick opening and closing when it is needed in an emergency, and the soft seal needs to be replaced regularly, and the operation is relatively cumbersome, the embodiment of the present application provides the following solution.

[0058] See also Figures 1 to 13 , the embodiment of the present application provides a knife gate valve with suction and exhaust functions, including: a valve body 1, a valve seat 2, a pneumatic mechanism and an inflatable sealing mechanism, flange mounting plates 11 are respectively provided at both ends of the valve body 1, a sealing filler 12 is provided on the valve body 1, a gate 3 is provided in the valve body 1, a group of mounting plates 13 are provided on the outer wall of the valve body 1, a plurality of mounting rods 14 are provided on the mounting plate 13, the gate 3 is located between the group of mounting plates 13, and a valve stem 31 is fixedly connected to the top of the gate 3; the pneumatic mechanism is arranged above the group of mounting plates 13, the valve stem 31 is fixedly connected to the pneumatic mechanism, and the pneumatic mechanism is used to realize the rapid opening and closing of the gate 3 on the valve body 1; the inflatable sealing mechanism is arranged at the bottom of the valve body 1, and the inflatable sealing mechanism is used to reduce the friction between the gate 3 and the valve seat 2 during the opening and closing process and to improve the sealing between the valve seat 2 and the gate 3;

[0059] When the knife gate valve is in use, the flange mounting plates 11 at both ends of the valve body 1 are bolted to the pipeline to be connected, and then the flange mounting plates 11 and the pipeline to be connected are additionally reinforced by a tightening installation mechanism to avoid leakage of the medium in the circulation pipeline due to high medium flow pressure at the connection between the circulation pipeline and the flange mounting plate 11 when the gate plate 3 in the large-diameter circulation pipeline is opened and closed quickly.

[0060] See also Figures 3 to 5 The valve seat 2 is U-shaped, a cutting groove 21 is provided on the valve seat 2, a group of sealing seats 22 are symmetrically provided at both ends of the valve seat 2, an O-ring 24 is provided between the sealing seat 22 and the valve body 1, and a flexible metal sealing member 23 is provided at one end of the sealing seat 22 away from the valve seat 2;

[0061] The effect of such arrangement is that, by adopting a movable sealing structure between the valve seat 2 and the valve body 1, the O-ring 24 is pre-tightened, and the flexible metal seal 23 makes the sealing seat 22 have a certain floatability in the valve body 1, and the valve seat 2 will not return to its original state after the medium loses its force on the valve seat 2. The early warning force provided by the O-ring 24 makes the sealing seat 22 close to the valve seat 2, effectively reducing the impact of the medium on the valve seat 2, which causes the offset and misalignment of the sealing component, thereby improving the sealing performance of the valve body 1.

[0062] See also Figures 7 to 9The pneumatic mechanism further includes: a cylinder body 4, an air source 41, an air delivery pipe 411, a first air inlet pipe 421 and a second air inlet pipe 422; the cylinder body 4 is fixedly arranged on a set of mounting plates 13 through a plurality of mounting rods 14, a piston 45 moves in the cylinder body 4, the piston 45 divides the cylinder body 4 into an upper sealing chamber 43 and a lower sealing chamber 44, a rubber sealing ring is arranged between the outer wall of the piston 45 and the inner wall of the cylinder body 4, and the air source 41 and the double-control solenoid valve 42 are respectively arranged on both sides of the cylinder body 4;

[0063] An air inlet 4111 is provided at one end of the double-control solenoid valve 42, and a first air delivery port 4211 and a second air delivery port 4221 are provided at the other end. A second exhaust port 425 and a first exhaust port 426 are provided on both sides of the air inlet 4111, respectively. A first coil 423 and a second coil 424 are provided on the valve body 1. An air inlet chamber 427, a first connecting chamber 4271 and a second connecting chamber 4272 are provided in the double-control solenoid valve 42. The air inlet chamber 427 is provided between the first connecting chamber 4271 and the second connecting chamber 4272. A valve core 428 is provided in the double-control solenoid valve 42. The valve core 428 moves in the air inlet chamber 427, the first connecting chamber 4271 and the second connecting chamber 4272. The second exhaust port 425 and the first exhaust port 426 are both connected to a first suction mechanism.

[0064] The gas source 41 is connected to the gas inlet 4111 of the double-control solenoid valve 42 through the gas delivery pipe 411, and the first gas delivery port 4211 and the second gas delivery port 4221 are connected to the upper sealed chamber 43 and the lower sealed chamber 44 of the cylinder body 4 through the first gas inlet pipe 421 and the second gas inlet pipe 422 respectively;

[0065] With this arrangement, when it is necessary to cut off the flow pipeline, the external power supply is connected to the first coil 423, and the valve core 428 moves in the direction away from the first coil 423. At this time, the air inlet chamber 427 is connected to the first connecting chamber 4271, and the valve core 428 blocks the second connecting chamber 4272 and the air inlet chamber 427, and the compressed air is delivered to the double-control solenoid valve 42 through the air source 41, and the compressed air enters the air inlet chamber 427 through the air supply pipe 411 and the air inlet port 4111 on the double-control solenoid valve 42. The compressed air entering the air inlet chamber 427 enters the upper sealing chamber 43 in the cylinder body 4 through the first connecting chamber 4271, the first air supply port 4211 and the first air supply pipe 421. At this time, the air pressure in the upper sealing chamber 43 is greater than the air pressure in the lower sealing chamber 44, and the piston 45 is squeezed downward, driving the valve stem 31 and the gate plate 3 to overlap with the cutting groove 21 on the valve seat 2, so as to close the valve body 1;

[0066] At the same time, the air in the lower sealed chamber 44 enters the second communicating chamber 4272 of the dual-control solenoid valve 42 through the second air inlet pipe 422 and the second air delivery port 4221, and the air entering the second communicating chamber 4272 is discharged through the first exhaust port 426. Here, the suction of the gas in the lower sealed chamber 44 is accelerated by connecting the external first suction mechanism, so that the knife gate valve can be quickly closed. The closing time is shorter than that of the existing large knife gate valve, and it can be quickly opened and closed in an emergency.

[0067] Similarly, when the second coil 424 is connected to the external power supply, the valve core 428 moves in a direction away from the second coil 424, at which time the air inlet chamber 427 is connected to the second communicating chamber 4272, the valve core 428 blocks the air inlet chamber 427 and the first communicating chamber 4271, and the first communicating chamber 4271 is connected to the second exhaust port 425, thereby realizing the rapid opening of the knife gate valve;

[0068] See also Figures 10 to 12 The inflation sealing mechanism also includes: an air storage cylinder 5, a group of air intake connecting pipes 51, a communicating air pipe 52, a plurality of communicating air cylinders 53 and a group of communicating pipes 54. The air storage cylinder 5 is arranged at the bottom of the valve body 1. The plurality of communicating air cylinders 53 are evenly arranged in a group of mounting grooves 211, and the plurality of communicating air cylinders 53 in the same mounting groove 211 are connected through the communicating pipe 54. The air storage cylinder 5 is connected with one of the communicating air cylinders 53 through the air intake connecting pipe 51. A group of mounting grooves 211 is arranged in the valve seat 2. The extrusion sealing airbag 212 is arranged in the cutting groove 21, and the extrusion sealing airbag 212 blocks the mounting groove 211.

[0069] An air blowing port 531 is provided at one end of the communicating air cylinder 53 close to the extrusion sealing airbag 212, the communicating air pipe 52 is connected to the air storage cylinder 5, and a second suction mechanism is provided at one end of the communicating air pipe 52 away from the air storage cylinder 5;

[0070] The effect of such a setting is that when the gate plate 3 is closed, air is supplied to the connecting air cylinder 53 through the air storage cylinder 5, and the gas in the connecting air cylinder 53 is blown toward the extrusion sealing air bag 212 through the blowing port 531, so that the extrusion sealing air bag 212 seals the gate plate 3 with a better sealing effect. At the same time, when the gate plate 3 is opened, the gas in the mounting groove 211 is extracted through the first suction mechanism connected to the suction air storage cylinder 5. At this time, the extrusion sealing air bag 212 returns to its original state and does not contact the surface of the gate plate 3, thereby reducing the friction between the gate plate 3 and the valve seat 2 during the opening and closing process, and reducing the frequency of regular replacement of soft seals.

[0071] See also Fig.13 A fastening and mounting mechanism is provided on the outer side wall of the flange mounting plate 11, and the fastening and mounting mechanism includes: a first clamping ring 6, a second clamping ring 61, a fastening groove 611, a rotating shaft 62, a rotating member 63, a bolt 64 and a rotating nut 65;

[0072] The first clamp ring 6 and the second clamp ring 61 are both arranged in a semicircular ring shape, and are rotatably connected to each other via a rotating shaft 62. The first clamp ring 6 and the second clamp ring 61 are both provided with a mounting connection groove at one end away from the rotating shaft 62. A rotating member 63 is arranged in the mounting connection groove of the first clamp ring 6, and the rotating member 63 is rotatably connected to the first clamp ring 6. The rotating member 63 is coaxially fixedly connected to a bolt 64, and a rotating nut 65 is threadedly connected to the bolt 64.

[0073] The effect of this arrangement is that the first clamp ring 6 and the second clamp ring 61 are rotated with the rotating shaft 62 as the center to their size and are sleeved onto the outer wall of the flange mounting plate 11, and then the nut 65 is rotated to cooperate with the bolt 64, so that the flange on the circulation pipeline and the flange mounting plate 11 are sleeved in the fastening groove 611, thereby strengthening the connection strength of the connection between the circulation pipeline and the flange mounting plate 11.

[0074] See also Figure 1 , a control board is provided on the mounting plate 13, a convex rod 311 is provided on the valve stem 31, a group of proximity switches 7 are provided on the mounting plate 13, the convex rod 311 is arranged between a group of proximity switches 7, the control board is connected to the proximity switches 7 by electrical signals, and the air source 41, the double-control solenoid valve 42 and the first suction mechanism and the second suction mechanism are connected by electrical signals;

[0075] In this way, a group of proximity switches 7 are arranged on the mounting plate 13, and a protruding rod 311 is provided on the valve stem 31. The protruding rod 311 is arranged between a group of proximity switches 7 to monitor the opening and closing status of the gate plate 3 of the knife gate valve. The proximity switch 7 transmits the monitoring information to the control panel through an electrical signal in real time. The control panel controls the air source 41, the double-control solenoid valve 42, and the first suction mechanism and the second suction mechanism to make a working response, thereby realizing automatic control of the pneumatic knife gate valve, and the operation is simple and convenient.

[0076] From the above, we can see that the working principle of this application is as follows:

[0077] When it is necessary to cut off the flow pipeline, the external power supply is connected to the first coil 423, and the valve core 428 moves in the direction away from the first coil 423. At this time, the air inlet chamber 427 is connected to the first connecting chamber 4271, and the valve core 428 blocks the second connecting chamber 4272 and the air inlet chamber 427. The compressed air is delivered to the double-control solenoid valve 42 through the air source 41, and the compressed air enters the air inlet chamber 427 through the air delivery pipe 411 and the air inlet port 4111 on the double-control solenoid valve 42. The compressed air entering the air inlet chamber 427 enters the upper sealing chamber 43 in the cylinder body 4 through the first connecting chamber 4271, the first air delivery port 4211 and the first air inlet pipe 421.

[0078] At this time, the air pressure in the upper sealing chamber 43 is greater than the air pressure in the lower sealing chamber 44, and the piston 45 is pressed downward, driving the valve stem 31 and the gate plate 3 to overlap with the cut-off groove 21 on the valve seat 2, closing the valve body 1. At the same time, the air in the lower sealing chamber 44 enters the second connecting chamber 4272 of the dual-control solenoid valve 42 through the second air inlet pipe 422 and the second air delivery port 4221, and the air entering the second connecting chamber 4272 is discharged through the first exhaust port 426;

[0079] An extrusion sealing airbag 212 is provided on the inner wall of the cutting groove 21 of the valve seat 2. When the gate plate 3 is closed, air is supplied to the connecting air cylinder 53 through the air storage cylinder 5, and the gas in the connecting air cylinder 53 is blown toward the extrusion sealing airbag 212 through the blowing port 531, so that the extrusion sealing airbag 212 seals the gate plate 3 with a good sealing effect. At the same time, when the gate plate 3 is opened, the gas in the installation groove 211 is extracted through the first suction mechanism connected to the suction air storage cylinder 5. At this time, the extrusion sealing airbag 212 returns to its original state and does not contact the surface of the gate plate 3.

[0080] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

[0081] Although the present application has been described with reference to several specific embodiments, it should be understood that the present application is not limited to the specific embodiments disclosed. The present application is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. Knife gate valve with suction and exhaust functions, characterized in that: include: A valve body (1), a valve seat (2), a pneumatic mechanism and an inflatable sealing mechanism, wherein flange mounting plates (11) are respectively provided at both ends of the valve body (1), a sealing filler (12) is provided on the valve body (1), a gate plate (3) is provided inside the valve body (1), a group of mounting plates (13) are provided on the outer wall of the valve body (1), a plurality of mounting rods (14) are provided on the mounting plate (13), the gate plate (3) is located between the group of mounting plates (13), and a valve stem (31) is fixedly connected to the top of the gate plate (3); The valve seat (2) is arranged in a U-shape, a cutting groove (21) is provided on the valve seat (2), a group of sealing seats (22) are symmetrically provided at both ends of the valve seat (2), an O-ring (24) is provided between the sealing seat (22) and the valve body (1), and a flexible metal sealing member (23) is provided at one end of the sealing seat (22) away from the valve seat (2); A pneumatic mechanism, the pneumatic mechanism being arranged above a set of mounting plates (13), the valve stem (31) being fixedly connected to the pneumatic mechanism, the pneumatic mechanism comprising a double-control solenoid valve (42) for realizing rapid opening and closing of the gate plate (3) on the valve body (1); An inflatable sealing mechanism, the inflatable sealing mechanism being arranged at the bottom of the valve body (1), the inflatable sealing mechanism comprising a plurality of extrusion sealing airbags (212) for reducing the friction between the gate plate (3) and the valve seat (2) during the opening and closing process and improving the sealing performance between the valve seat (2) and the gate plate (3), the valve seat (2) being provided with a group of mounting grooves (211), the extrusion sealing airbags (212) being arranged in the cutting grooves (21), and the extrusion sealing airbags (212) blocking the mounting grooves (211); The inflatable sealing mechanism also includes: An air storage cylinder (5), a group of air intake connecting pipes (51), a communicating air pipe (52), a plurality of communicating air cylinders (53) and a group of communicating pipes (54), wherein the air storage cylinder (5) is arranged at the bottom of the valve body (1), the plurality of communicating air cylinders (53) are evenly arranged in a group of mounting grooves (211), and the plurality of communicating air cylinders (53) in the same mounting groove (211) are connected via the communicating pipe (54), and the air storage cylinder (5) is connected to one of the communicating air cylinders (53) via the air intake connecting pipe (51); An air blowing port (531) is provided at one end of the communicating air cylinder (53) close to the extrusion sealing air bag (212), the communicating air pipe (52) is connected to the air storage cylinder (5), and a second suction mechanism is provided at one end of the communicating air pipe (52) away from the air storage cylinder (5); When the gate plate (3) is closed, gas is supplied to the connecting gas cylinder (53) through the gas storage cylinder (5), and the gas in the connecting gas cylinder (53) is blown toward the extrusion sealing air bag (212) through the blowing port (531), so that the extrusion sealing air bag (212) seals the gate plate (3); A fastening and mounting mechanism is provided on the outer side wall of the flange mounting plate (11), the fastening and mounting mechanism comprising: a first clamping ring (6), a second clamping ring (61), a fastening groove (611), a rotating shaft (62), a rotating member (63), a bolt (64) and a rotating nut (65); The first clamping ring (6) and the second clamping ring (61) are both arranged in a semicircular ring shape, and are rotatably connected to each other via a rotating shaft (62). The first clamping ring (6) and the second clamping ring (61) are both provided with a mounting connection groove at one end away from the rotating shaft (62). The rotating member (63) is arranged in the mounting connection groove of the first clamping ring (6), and the rotating member (63) is rotatably connected to the first clamping ring (6). The rotating member (63) is coaxially fixedly connected to the bolt (64), and the rotating nut (65) is threadedly connected to the bolt (64).

2. The knife gate valve with suction and exhaust functions according to claim 1 is characterized in that: The pneumatic mechanism also includes: A cylinder body (4), an air source (41), an air delivery pipe (411), a first air intake pipe (421), and a second air intake pipe (422); the cylinder body (4) is fixedly mounted on a set of mounting plates (13) via a plurality of mounting rods (14); a piston (45) moves inside the cylinder body (4); the piston (45) divides the inside of the cylinder body (4) into an upper sealed chamber (43) and a lower sealed chamber (44); the air source (41) and the double-control solenoid valve (42) are respectively mounted on two sides of the cylinder body (4); The double-control solenoid valve (42) is provided with an air inlet (4111) at one end and a first air delivery port (4211) and a second air delivery port (4221) at the other end; a second exhaust port (425) and a first exhaust port (426) are provided on both sides of the air inlet (4111), respectively; a first coil (423) and a second coil (424) are provided on the valve body (1); an air inlet chamber (427), a first connecting chamber (4271) and a second connecting chamber (4272) are provided in the double-control solenoid valve (42); the air inlet chamber (427) is arranged between the first connecting chamber (4271) and the second connecting chamber (4272); a valve core (428) is provided in the double-control solenoid valve (42); the valve core (428) moves in the air inlet chamber (427), the first connecting chamber (4271) and the second connecting chamber (4272); and the second exhaust port (425) and the first exhaust port (426) are both connected to a first suction mechanism; The gas source (41) is connected to the gas inlet (4111) of the dual-control solenoid valve (42) via the gas delivery pipe (411), and the first gas delivery port (4211) and the second gas delivery port (4221) are connected to the upper sealed chamber (43) and the lower sealed chamber (44) of the cylinder body (4) via the first gas inlet pipe (421) and the second gas inlet pipe (422), respectively.

3. The knife gate valve with suction and exhaust functions according to claim 2 is characterized in that: A rubber sealing ring is provided between the outer wall of the piston (45) and the inner wall of the cylinder body (4).

4. The knife gate valve with suction and exhaust functions according to claim 1 is characterized in that: A control panel is provided on the mounting plate (13), a protruding rod (311) is provided on the valve stem (31), a group of proximity switches (7) are provided on the mounting plate (13), the protruding rod (311) is arranged between the group of proximity switches (7), and the control panel is connected to the proximity switches (7) via electrical signals.

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