A dual-circuit redundant device for pneumatic valve accessories

Abstract

This utility model discloses a dual-air-path redundancy device for pneumatic valve accessories, comprising a valve body, a first support plate above the valve body, a second support plate above the first support plate, and several support columns between the first and second support plates. A main positioner and a secondary positioner are positioned above the first support plate, each with an independent air path. A main valve stem is positioned below and connected to the main positioner, passing through the first and second support plates and connecting to the lower valve body. A secondary valve stem is positioned below and connected to the secondary positioner, passing through the first support plate. A synchronization component is positioned between and connected to the main and secondary valve stems, ensuring that their displacements are kept consistent. Switching the main air path wiring to the redundant air path wiring also ensures that the valve stem position remains consistent during switching.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic valves, and in particular to a dual-air-path redundancy device for pneumatic valve accessories. Background Technology

[0002] In the wave of modern industrial production, the rapid development of automation technology has greatly boosted production efficiency and quality control, especially in traditional large enterprises. As an indispensable key component of industrial automation control systems, control valves play a crucial role in various processes, precisely regulating the flow, pressure, and temperature of media. Their performance stability and control accuracy directly affect the operating efficiency and product quality of the entire production line. Therefore, with the continuous expansion of production scale and increasingly stringent production requirements, the performance requirements for valve regulation have also risen to a new level.

[0003] Most existing control valves are based on a single-path design. However, with the increasing complexity of production environments and the refinement of production requirements, the limitations of the single-path design have become apparent. First, the single-path structure means that if any component, such as the positioner, fails, the entire valve system faces the risk of going out of control. Replacing the positioner requires resetting, which inevitably leads to valve actuation. Unexpected valve actuation can severely impact production and even cause safety accidents. Second, the single-path design makes valve maintenance and repair particularly challenging, especially in processes involving high-temperature, high-pressure, or toxic and hazardous media. Maintenance personnel face significant safety challenges, increasing the risk factor of operations. Even if some technicians have solved the problem of difficult maintenance of existing single-path valve accessories by introducing two completely independent pneumatic systems, the valve stem position of the current control valve body cannot be synchronized. When the main pneumatic path is being repaired and switched to the auxiliary pneumatic path, or vice versa, the original displacement distance or rotation angle of the valve stem cannot be synchronized, severely limiting the overall performance, safety, and efficiency of industrial automation control systems. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model provides a dual-air-path redundancy device for pneumatic valve accessories. The device includes a valve body, a first support plate above the valve body, a second support plate above the first support plate, and several support columns between the first and second support plates. A main positioner and a secondary positioner are positioned above the first support plate, each with an independent air path. A main valve stem is positioned below and connected to the main positioner, passing through the first and second support plates and connecting to the lower valve body. A secondary valve stem is positioned below and connected to the secondary positioner, passing through the first support plate. A synchronization component is positioned between and connected to the main and secondary valve stems, ensuring that the displacements of the main and secondary valve stems are kept consistent through the synchronization component.

[0005] Preferably, the synchronization component includes a first synchronization link, a second synchronization link, and a pin. Each end of the first synchronization link is movably connected to a second synchronization link, and the other end of the second synchronization link is fixedly connected to the main valve stem and the auxiliary valve stem. The first synchronization link, the second synchronization link, and the pin cooperate with each other to synchronize the radial rotation angles of the main valve stem and the auxiliary valve stem.

[0006] Preferably, the first synchronizing link has a first fixing hole at both ends, and the second synchronizing link has a U-shaped structure with a second fixing hole in the vertical direction at one end. The first fixing hole is located between the two second fixing holes and aligned vertically. The pin is inserted into the first fixing hole and the two second fixing holes. Both the first synchronizing link and the second synchronizing link can rotate around the pin as the axis. The other ends of the two second synchronizing links are fixedly connected to the radial positions of the main valve stem and the auxiliary valve stem, respectively.

[0007] Preferably, the independent air circuit includes a first air circuit gate valve, a pressure reducing valve, a four-way valve, a main positioner / sub-positioner, a pneumatic amplifier, an air lock valve, and a second air circuit gate valve, which are connected sequentially from left to right in this order.

[0008] Preferably, the gas in the independent circuit passes through the four-way valve, One path leads to the pneumatic amplifier, which in turn leads to the airlock valve, which in turn connects to the cylinder. One path enters the main air path contact positioner, the positioner's outlet enters the pneumatic amplifier, and the pneumatic amplifier enters the air lock valve. It goes directly into the airlock valve.

[0009] Preferably, after the first and second gas valve gates of one of the independent gas paths are opened, the first and second gas valve gates of the other independent gas path are closed.

[0010] Preferably, the main positioner and the auxiliary positioner are either electric positioners or pneumatic positioners.

[0011] Preferably, the first support plate, the second support plate, and the support column are made of stainless steel.

[0012] Preferably, the synchronization component is made of stainless steel.

[0013] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial technical effects: 1. This dual-circuit redundant pneumatic valve accessory system employs a dual independent pneumatic circuit system for the main and auxiliary positioners. When the control valve is in normal operation, the relevant equipment in the main pneumatic circuit will operate, while the redundant pneumatic circuit remains in standby mode. If any accessory in the main pneumatic circuit malfunctions, the fault can be determined via a valve position deviation alarm on the DCS system. Upon alarm activation, personnel can switch to the redundant pneumatic circuit and manually rewire the main pneumatic circuit to the redundant circuit, ensuring uninterrupted DCS control and a smooth switching process. This device features a simple and clear structural design, ensuring reliable and stable operation and avoiding the safety risks and economic losses associated with a single design.

[0014] 2. This pneumatic valve accessory features a dual-circuit redundant device. Through a synchronization component, the radial rotation angles of the main valve stem and the auxiliary valve stem are synchronized. When the main valve malfunctions and requires repair or replacement, the rotation angle of the main valve stem is already synchronized to the auxiliary valve stem via the synchronization component. Even when switching to the auxiliary positioner, the main valve stem and the valve body connected below can still be maintained in the same position. When the auxiliary positioner operates, it can control the rotation of the auxiliary valve stem, and then synchronize its rotation angle to the main valve stem via the synchronization component. After the main positioner is readjusted and opened, the main valve stem will also synchronize with the state of the auxiliary valve stem when the auxiliary positioner is operating. Therefore, regardless of whether the main or auxiliary positioner needs repair or replacement, the valve position will not be affected, preventing valve loss of control or production shutdown due to positioner failure, thus achieving the system's redundant protection function. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the first operating state structure of a dual-air-path redundant device for pneumatic valve accessories proposed in this utility model.

[0016] Figure 2 This is a schematic diagram of the second operating state structure of a dual-air-path redundant device for pneumatic valve accessories proposed in this utility model.

[0017] Figure 3 This is a schematic diagram of the synchronization component structure in a dual-air-path redundancy device for pneumatic valve accessories proposed in this utility model.

[0018] Figure 4This is a bottom view of the first synchronous connecting rod structure in a dual-air-path redundant device for pneumatic valve accessories proposed in this utility model.

[0019] Figure 5 This is a bottom view of the second synchronous connecting rod structure in a dual-air-path redundant device for pneumatic valve accessories proposed in this utility model.

[0020] Figure 6 This invention provides an independent air path operation diagram for a dual-air path redundancy device for pneumatic valve accessories. Reference numerals: 1. Valve body; 2. First support plate; 3. Second support plate; 4. Support column; 5. Main positioner; 6. Secondary positioner; 7. Independent air path; 71. First air path valve gate; 72. Pressure reducing valve; 73. Four-way valve; 74. Pneumatic amplifier; 75. Air lock valve; 76. Second air path valve gate; 8. Main valve stem; 9. Secondary valve stem; 10. Synchronization assembly; 101. First synchronization link; 1011. First fixing hole; 102. Second synchronization link; 1021. Second fixing hole; 103. Pin. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0022] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, such as welding, riveting, or bonding; it can also be a detachable connection, such as threaded connection, keyed connection, or pin connection; or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] like Figure 1-6 As shown, this utility model proposes a dual-air-path redundancy device for pneumatic valve accessories, including a valve body 1. A first support plate 2 is arranged above the valve body 1, and a second support plate 3 is arranged above the first support plate 2. A plurality of support columns 4 are arranged between the first support plate 2 and the second support plate 3. A main positioner 5 and a secondary positioner 6 are arranged above the first support plate 2. The main positioner 5 and the secondary positioner 6 each have an independent air path 7. A main valve stem 8 is arranged below and connected to the main positioner 5. The main valve stem 8 passes through the first support plate 2 and the second support plate 3 and connects to the lower valve body 1. A secondary valve stem 9 is arranged below and connected to the secondary positioner 6. The secondary valve stem 9 passes through the first support plate 2. A synchronization component 10 is arranged between and connected to the main valve stem 8 and the secondary valve stem 9. The displacement of the main valve stem 8 and the secondary valve stem 9 is kept consistent through the synchronization component 10.

[0025] In this invention, when the regulating valve is in normal working condition, the relevant equipment in the main air circuit will participate in the operation, while the redundant air circuit is in standby mode. If any accessory in the main air circuit fails, the fault can be determined through the valve position deviation alarm on the DCS system. When the alarm occurs, personnel can switch to the redundant air circuit and switch the wiring of the main air circuit to the redundant air circuit on site, thereby ensuring that the control process of the DCS is not disturbed and achieving a smooth switch.

[0026] like Figure 1-4In the embodiment shown, the valve body 1 is of the type of valve body 1, such as a butterfly valve or ball valve, where the valve stem of the valve body 1 needs to rotate horizontally to control the valve opening and closing. The main positioner 5 and the auxiliary positioner 6 are fixedly installed above the second support plate 3 and have their own independent air passages 7. The main positioner 5 directly controls the rotation (angle) of the main valve stem 8 below, and the main valve stem 8 passes through the first support plate 2 to directly control the opening and closing (angle) of the valve body 1 below. An auxiliary valve stem 9 is provided below the auxiliary positioner 6. This auxiliary valve stem 9 cannot directly control the valve of the valve body 1, but is controlled by the synchronization component 1. The valve body 1 is controlled by connecting the main valve stem 8. The synchronization assembly 10 includes a first synchronization link 101, a second synchronization link 102, and a pin 103. The second synchronization link 102 has a U-shaped structure with two second fixing holes 1021 in the vertical direction at one end. The first fixing hole 1011 is placed between the two second fixing holes 1021 and aligned vertically. The pin 103 is inserted into the first fixing hole 1011 and the two second fixing holes 1021. The first synchronization link 101 and the second synchronization link 102 are connected. Each connecting rod 102 can rotate around the pin 103. The other ends of the two second synchronizing connecting rods 102 are fixedly connected to the radial positions of the main valve stem 8 and the auxiliary valve stem 9. The first synchronizing connecting rod 101, the second synchronizing connecting rod 102, and the pin 103 cooperate with each other to form a parallel connecting rod structure similar to a train wheel, so that the radial rotation angles of the main valve stem 8 and the auxiliary valve stem 9 are synchronized. When the main valve is damaged and needs to be repaired or replaced, the rotation angle of the main valve stem 8 has been synchronized to the auxiliary valve stem 9 through the synchronizing assembly 10, even when switching to auxiliary positioning. When the auxiliary positioner 6 is in operation, the main valve stem 8 and the valve body 1 connected below can still be kept in the same position. When the auxiliary positioner 6 is in operation, it can control the rotation of the auxiliary valve stem 9, and then synchronize its rotation angle to the main valve stem 8 through the synchronization component 10. After the main positioner 5 is re-adjusted and opened, the main valve stem 8 will also synchronize the state of the auxiliary valve stem 9 when the auxiliary positioner 6 is in operation. In this way, no matter which one of the main positioner 5 or the auxiliary positioner 6 needs to be repaired or replaced, it will not affect the valve position, avoid valve loss of control or production stoppage due to positioner failure, and realize the redundancy protection function of the system.

[0027] Furthermore, the aforementioned positioner may be any one of the following: an electric positioner or a pneumatic positioner.

[0028] Furthermore, the first support plate 2, the second support plate 3, and the support column 4 are made of stainless steel.

[0029] Furthermore, the synchronization component 10 is made of stainless steel.

[0030] like Figure 6As shown, in the independent air circuit 7, the first air circuit valve gate 71, pressure reducing valve 72, four-way valve 73, pneumatic amplifier 74, air lock valve 75, and second air circuit valve gate 76 are fixedly installed from left to right. When one of the independent air circuits 7 is started, its first air circuit valve gate 71 and second air circuit valve gate 76 are opened, and the first air circuit valve gate 71 and second air circuit valve gate 76 of the other circuit are closed. After the air source enters the independent air circuit 7, it enters the four-way valve 73 through the pressure reducing valve 72. One path leads to the pneumatic amplifier 74, and from the pneumatic amplifier 74 to the air lock valve 75. The air lock valve 75 is connected to the cylinder inlet, thus ensuring that the main air source enters through this path. One path enters the main positioner 5 / secondary positioner 6 of the air circuit, and from the outlet of the main positioner 5 / secondary positioner 6, it enters the pneumatic amplifier 74, and then from the pneumatic amplifier 74, it enters the air lock valve 75. This ensures that the main regulating air source enters through this path. There is also a direct line into the air lock valve 75, which ensures that when the air pressure is low, the air lock valve 75 cuts off the air supply, ensuring that the air supply pressure in the cylinder after the air lock valve 75 is stable, thereby maintaining the valve position.

[0031] If a positioner in the main air circuit malfunctions, the DCS system will issue a valve position deviation alarm. The on-site operator should close the gate valves in the main air circuit (first air circuit valve 71 and second air circuit valve 76), and switch the on-site positioner wiring to the redundant air circuit positioner to ensure stable control system switching. The main air circuit contact positioner should then be removed for inspection.

[0032] 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 dual-air-path redundancy device for a pneumatic valve accessory, comprising a valve body (1), a first support plate (2) disposed above the valve body (1), a second support plate (3) disposed above the first support plate (2), a plurality of support columns (4) disposed between the first support plate (2) and the second support plate (3), a main positioner (5) and a secondary positioner (6) disposed above the first support plate (2), wherein the main positioner (5) and the secondary positioner (6) each have an independent air path (7), characterized in that, A main valve stem (8) is provided and connected below the main positioner (5). The main valve stem (8) passes through the first support plate (2) and the second support plate (3) and connects to the lower valve body (1). A secondary valve stem (9) is provided and connected below the secondary positioner (6). The secondary valve stem (9) passes through the first support plate (2). A synchronization component (10) is provided and connected between the main valve stem (8) and the secondary valve stem (9). The displacement of the main valve stem (8) and the secondary valve stem (9) is kept consistent through the synchronization component (10).

2. The dual pneumatic redundancy device of claim 1, wherein, The synchronization component (10) includes a first synchronization link (101), a second synchronization link (102), and a pin (103). Each end of the first synchronization link (101) is movably connected to a second synchronization link (102). The other end of the second synchronization link (102) is fixedly connected to the main valve stem (8) and the auxiliary valve stem (9). The first synchronization link (101), the second synchronization link (102), and the pin (103) cooperate with each other to synchronize the radial rotation angles of the main valve stem (8) and the auxiliary valve stem (9).

3. The dual air path redundancy device of claim 2, wherein, The first synchronous link (101) has a first fixing hole (1011) at both ends. The second synchronous link (102) has a U-shaped structure with two second fixing holes (1021) in the vertical direction at one end. The first fixing hole (1011) is placed between the two second fixing holes (1021) and aligned vertically. The pin (103) is inserted into the first fixing hole (1011) and the two second fixing holes (1021). Both the first synchronous link (101) and the second synchronous link (102) can rotate around the pin (103). The other ends of the two second synchronous links (102) are fixedly connected to the radial positions of the main valve stem (8) and the auxiliary valve stem (9).

4. A dual air path redundancy device for a pneumatic valve accessory according to any one of claims 1 to 3, wherein, The independent air circuit (7) includes a first air circuit gate (71), a pressure reducing valve (72), a four-way valve (73), a main positioner (5) / secondary positioner (6), a pneumatic amplifier (74), an air lock valve (75), and a second air circuit gate (76), which are connected in this order from left to right.

5. The dual air path redundancy device of claim 4, wherein, The gas in the independent circuit passes through the four-way valve (73), One path enters the pneumatic amplifier (74), the pneumatic amplifier (74) enters the air lock valve (75), and the air lock valve (75) connects to the cylinder; One path enters the main air path contact positioner, the positioner outlet enters the pneumatic amplifier (74), and the pneumatic amplifier (74) enters the air lock valve (75). It goes directly into the airlock valve (75).

6. The dual air path redundancy device of claim 5, wherein, After the first gas passage valve gate (71) and the second gas passage valve gate (76) of one of the independent gas passages (7) are opened, the first gas passage valve gate (71) and the second gas passage valve gate (76) of the other independent gas passage (7) are closed.

7. The dual air path redundancy device of claim 1, wherein, The main positioner (5) and the auxiliary positioner (6) are either electric or pneumatic.

8. The dual air path redundancy device of claim 1, wherein, The first support plate (2), the second support plate (3) and the support column (4) are made of stainless steel.

9. The dual air path redundancy device of claim 1, wherein, The synchronization component (10) is made of stainless steel.

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