Pneumatic actuating mechanism and valve

Abstract

The pneumatic actuating mechanism comprises an air cylinder, a piston, a gear shaft, an end cover, a fastening assembly, a transmission shaft installation connector and a pressure selection valve, and the valve comprises a valve body, a valve seat, a valve element, a valve rod and a sealing ring. The pneumatic actuating mechanism and the valve are applied to the blast regeneration dryer, and can be controlled in a two-way competition mode: when the pressure in the adsorption tower is higher than the instrument gas pressure, the pneumatic actuating mechanism is controlled by a gas source in the tower; when the pressure in the tower is lower than the pressure of the instrument gas, the pneumatic actuating mechanism is controlled by the instrument gas. Namely, when the pressure in the regeneration tower is higher, the pneumatic actuating mechanism is in a self-locking state until the pressure in the tower is completely released.

Description

Technical Field

[0001] The present application relates to a control component in a gas processing device, and in particular to a pneumatic actuator and a valve. Background Art

[0002] In the field of industrial gas treatment, the air-blast heat regeneration adsorption dryer is a widely used device for removing moisture from compressed air to obtain dry, high-quality gas. The core structure of this type of equipment usually involves an adsorption tower, a blower, an electric heater, a switching valve, and a complex control system. Its operating principle is based on the alternating working mode of two adsorption towers: one tower is responsible for adsorption operations while the other tower is regenerated. This process includes several key steps: pressure relief, heating regeneration (using electric heaters), and cold blowing and cooling.

[0003] However, in the existing technical implementation, there are certain safety hazards in the initial pressure relief link of the regeneration stage. Standard operating procedures require that before heating, the compressed air in the adsorption tower must be discharged through the muffler and gradually reduced to normal pressure. However, due to potential failures of the control system or mechanical components (such as the pressure relief valve), if the valve fails to open in time or completely, the pressure in the regeneration tower may accumulate and cannot be effectively released. In this context, if the equipment continues to enter the heating stage according to the established sequence, the accumulated high-pressure gas may suddenly spray out from the discharge port, which will not only cause a strong impact on the surrounding environment, but also endanger the personal safety of on-site workers, and may also damage surrounding mechanical equipment.

[0004] Therefore, in response to this common problem in the industry, an innovative technical solution is urgently needed, which can automatically take measures to prevent the start of the heating program when the pressure in the regeneration tower is detected to be abnormally high, and ensure that the pressure in the adsorption tower is safely and effectively released, thereby significantly improving the safety performance and operational stability of the blast heat regeneration adsorption dryer. This is the background for the development of this utility model, which aims to overcome the limitations of the existing technology and ensure the continuity and safety of production operations by introducing intelligent and highly reliable control components. Utility Model Content

[0005] The purpose of this application is to provide a pneumatic actuator and a valve to address the above-mentioned problems existing in the prior art.

[0006] In order to achieve the above application purpose, the present application adopts the following technical solutions: a pneumatic actuator and a valve for controlling the valve operation of the safe release of the pressure in the regeneration tower, including a cylinder, a piston assembly, a gear transmission mechanism, an end cover assembly, a fastening assembly and a transmission shaft mounting interface, the piston assembly includes a left piston and a right piston, each side of the piston is internally provided with a rack structure, which is arranged on the opposite side of the cylinder and can slide along the inner wall of the cylinder;

[0007] The gear transmission mechanism has two sets of gear grooves matching the piston rack, located in the middle of the cylinder and connected to the cylinder for rotation, ensuring that the valve is kept closed under certain conditions until the pressure in the tower is completely released, to prevent safety hazards caused by sudden discharge of compressed air;

[0008] The cylinder has interfaces P0, P1 and P2 connected to the outside, P0 connects to the cavity between the two pistons, and P1 and P2 connect to the cavity between the left piston and the left end cover and the cavity between the right piston and the right end cover through a pressure selection mechanism.

[0009] Furthermore, a three-way pneumatic shuttle valve is used as a pressure selection mechanism to flexibly adjust the air pressure connection between the P0, P1, and P2 interfaces.

[0010] Furthermore, bolts are used as fastening components between the end cover and the cylinder.

[0011] Furthermore, the bolt is specifically a hexagon socket head bolt.

[0012] Furthermore, the transmission shaft assembly hole is designed to be square to accommodate stable docking of the transmission shaft.

[0013] Furthermore, an instrument air interface of Rc1 / 4 or Rc1 / 8 specification is configured to meet different air source access requirements.

[0014] Furthermore, a piston position indicator is integrated on the top of the gear transmission mechanism to intuitively monitor the working status of the piston.

[0015] A safety control valve that works in conjunction with the above-mentioned pneumatic actuator, includes a valve body, a valve seat, a valve core, a valve stem and a sealing assembly, and is characterized in that the valve stem and the transmission shaft mounting interface of the pneumatic actuator are connected by a snap-fit ​​method to ensure that the control instructions of the actuator are accurately transmitted to the valve, thereby realizing a steady-state locking function when the pressure is too high.

[0016] Furthermore, when the piston assembly in the pneumatic actuator is at the center position, the valve remains in a closed state; when the piston assembly is at the two end positions inside the pneumatic actuator, the valve is in an open state.

[0017] Furthermore, the maximum torque that the valve is designed to withstand does not exceed 70% of the output torque of the matching pneumatic actuator.

[0018] Compared with the prior art, the utility model significantly improves the safety control capability of the blast heat regeneration adsorption dryer in the regeneration stage by introducing an innovative pneumatic actuator and a matching valve system. The specific beneficial effects are reflected in the following aspects:

[0019] 1. Enhanced safety performance: When the pressure in the regeneration tower cannot be effectively released, the pneumatic actuator of the utility model can continue to maintain its original state after receiving the valve opening signal when the pressure in the regeneration tower is high, so that the matching valve remains closed synchronously, and the pressure in the tower is completely released to prevent the compressed air from being accidentally discharged, which significantly reduces the potential harm to operators and surrounding equipment.

[0020] 2. Intelligent pressure management: Through the integrated three-way pneumatic shuttle valve and precise piston-gear transmission mechanism, this device can realize intelligent monitoring and control of the pressure in the regeneration tower, ensuring that the pressure is effectively and smoothly released, improving the safety and stability of the entire dryer system operation.

[0021] 3. Improve system reliability: The use of high-quality fastening components, specially designed drive shaft assembly structure and interfaces compatible with multiple air sources enhances the structural strength and durability of the pneumatic actuator, reduces operational interruptions caused by mechanical failures, and improves the reliability and service life of the overall system.

[0022] 4. Easy to maintain and monitor: The equipped piston position indicator enables the operator to intuitively understand the working status of the pneumatic actuator, which is convenient for daily maintenance and rapid troubleshooting, further improving the maintenance efficiency and operation transparency of the equipment.

[0023] 5. Optimize energy efficiency and cost: By precisely controlling the airflow management during the regeneration process, unnecessary energy waste is reduced, while the downtime and maintenance costs caused by safety accidents are avoided, saving operating costs for the company in the long run and improving economic benefits.

[0024] 6. In summary, the utility model provides a safer, smarter and more reliable control solution for the blower heat regeneration adsorption dryer through its unique design and technical improvement, which not only improves the comprehensive performance of the equipment, but also sets a new standard for safe production in the field of industrial gas treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the pneumatic actuator of the present application;

[0026] Figure 2 It is a schematic diagram of the structural principle of the pneumatic actuator of the present application;

[0027] Figure 3 It is a schematic diagram of the pneumatic actuator of the present application applied to a pneumatic butterfly valve.

[0028] In the figure, 1. cylinder; 2. piston assembly; 3. gear transmission mechanism; 4. end cover assembly; 5. three-way pneumatic shuttle valve; 6. piston position indicator; 7. valve body; 8. valve stem; 9. valve core; 21. left piston; 22. right piston; 23. rack structure; 31. gear groove; 32. transmission shaft. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0030] Those skilled in the art should understand that, in the disclosure of the present application, the terms "longitudinal", "lateral", "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 accompanying drawings, which 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. Therefore, the above terms should not be understood as limiting the present application.

[0031] like Figure 1 and Figure 2 As shown, this embodiment provides a detailed implementation scheme of a pneumatic actuator and a valve, which is suitable for pressure control and safety release of a blast heat regeneration adsorption dryer.

[0032] 1. Construction of pneumatic actuator:

[0033] The pneumatic actuator is mainly made of high-strength materials and includes the following key components:

[0034] Cylinder 1: It can be made of stainless steel, and the internal space is divided into two parts to accommodate the piston assemblies 2 on the left and right sides. Cylinder 1 is provided with interfaces P0, P1 and P2, wherein P0 is the connecting port of the cavity between the two pistons, and P1 and P2 are respectively connected to the cavity on the side of their respective end covers through the pressure selection mechanism.

[0035] Piston assembly 2: includes left piston 21 and right piston 22. The piston surface is smooth and a rack structure 23 is embedded inside to mesh with the gear shaft. The piston slides in the cylinder 1 and realizes reciprocating motion through air pressure drive.

[0036] Gear transmission mechanism 3: Located in the center of the cylinder 1, it has two pairs of gears (preferably one set of teeth on each of the four sides of the transmission shaft 32), and the gears are designed with tooth grooves that mesh with the piston rack. When the air pressure changes, the gears rotate to drive the piston to move, achieving precise control of the valve.

[0037] End cover assembly 4: Left and right end covers are installed at both ends of the cylinder 1 and are fastened with hexagon socket head bolts to ensure air tightness.

[0038] The assembly hole of the transmission shaft 32 is designed to be square to ensure the stable connection between the valve stem 8 and the actuator.

[0039] Pressure selection mechanism: The three-way pneumatic shuttle valve 5 is used to flexibly adjust the air pressure distribution of the P0, P1, and P2 interfaces as needed to adapt to different working conditions. Among them, the three-way pneumatic shuttle valve 5 is equivalent to a valve composed of two one-way valves, and its function is equivalent to an "OR gate". The shuttle valve has two air inlets, P1 and P2, and one air outlet, B. Both P1 and P2 can be connected to the B port, but P1 and P2 are not connected. If either P1 or P2 has air input, B has output. If both P1 and P2 have air input, the air on the side that enters the air first or the side with higher air pressure will be output from the B port first, and the other side will be blocked and cannot be output. Only when there is no air input to P1 and P2, there is no air output from B.

[0040] Piston position indicator: installed on the top of the gear shaft, it displays the current position of the piston in real time for easy monitoring.

[0041] 2. Design of supporting safety control valve:

[0042] The valve is specially designed for pneumatic actuators, and its structure includes a valve body 7, a valve seat, a valve core 9, a valve stem 8 and a sealing component, such as Figure 3 As shown, a pneumatic butterfly valve is preferred (the structure and principle of the pneumatic butterfly valve are prior art and will not be described here). The valve stem 8 is tightly connected to the assembly hole of the transmission shaft 32 of the pneumatic actuator by a snap-fit ​​method to ensure accurate transmission of the control signal. The working state of the valve is directly related to the piston position of the pneumatic actuator. When the piston is in the center, the valve remains closed; when the piston moves to both ends, the valve opens. The valve design has been mechanically calculated, and the maximum torque it can withstand does not exceed 70% of the output torque of the pneumatic actuator, ensuring the safety of operation under any circumstances.

[0043] 3. Workflow Example:

[0044] When the regeneration tower needs to release pressure, if the pressure in the tower rises abnormally, the pneumatic actuator will receive the pressure signal but will not immediately respond to the command to open the valve, but will maintain the current state until it is confirmed that the pressure has dropped to a safe level. The flexible regulation of the three-way pneumatic shuttle valve 5 ensures the correct distribution of air pressure, so that the piston action conforms to the expected safety logic. During this period, the piston position indicator provides intuitive monitoring information to help operators understand the equipment status in a timely manner.

[0045] For example, when the pressure in the adsorption tower is higher than the instrument gas, the pressure selector valve automatically switches the pneumatic actuator and the instrument gas pipeline channel (no longer controlled by the instrument gas), and the two ends of the pneumatic actuator are pushed by the compressed air from the adsorption tower, and the valve remains closed. That is, when the pressure in the adsorption tower is higher than the instrument gas pressure (generally set to 0.2~0.3MPa), even if the control system receives an opening command, the valve will remain closed because the instrument gas is cut off by the pressure selector valve.

[0046] The pneumatic actuator and valve system of this embodiment realizes efficient and safe control of the regeneration phase of the blower heat regeneration adsorption dryer through the above-mentioned design, significantly improves the safety, stability and maintenance efficiency of equipment operation, and meets the high standards of industrial production for safe production.

[0047] The parts not described in detail in this application are prior art, so this application does not describe them in detail.

[0048] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0049] Although the present invention uses more terms such as cylinder 1, piston assembly 2, gear transmission mechanism 3, end cover assembly 4, three-way pneumatic shuttle valve 5, piston position indicator 6, valve body 7, valve stem 8, valve core 9, left piston 21, right piston 22, rack structure 23, gear groove 31, transmission shaft 32, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present application; interpreting them as any additional restrictions is contrary to the spirit of the present application.

[0050] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of this application. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present application.

Claims

1. A pneumatic actuator for controlling the valve operation for safely releasing the pressure in a regeneration tower, comprising a cylinder, a piston assembly, a gear transmission mechanism, an end cover assembly, a fastening assembly and a transmission shaft mounting interface, characterized in that: The piston assembly comprises a left piston and a right piston, each piston having a rack structure disposed inside thereof, which is arranged on the opposite side of the cylinder and can slide along the inner wall of the cylinder; The gear transmission mechanism has two sets of gear grooves matching the piston rack, located in the middle of the cylinder and connected to the cylinder for rotation, ensuring that the valve is kept closed under certain conditions until the pressure in the tower is completely released, to prevent safety hazards caused by sudden discharge of compressed air; The cylinder has interfaces P0, P1 and P2 communicating with the outside, P0 communicates with the cavity between the two pistons, and P1 and P2 communicate with the cavity between the left piston and the left end cover and with the cavity between the right piston and the right end cover through a pressure selection mechanism.

2. A pneumatic actuator according to claim 1, characterized in that: A three-way pneumatic shuttle valve is used as a pressure selection mechanism to flexibly adjust the air pressure connection between the P0, P1, and P2 interfaces.

3. A pneumatic actuator according to claim 1, characterized in that: Bolts are used as fastening components between the end cover and the cylinder.

4. A pneumatic actuator according to claim 3, characterized in that: The bolt is specifically a hexagon socket head bolt.

5. A pneumatic actuator according to claim 1, characterized in that: The transmission shaft assembly hole is designed to be square to accommodate stable docking of the transmission shaft.

6. A pneumatic actuator according to claim 1, characterized in that: Equipped with Rc1 / 4 or Rc1 / 8 instrument air interface to meet different air source access requirements.

7. A pneumatic actuator according to claim 1, characterized in that: A piston position indicator is integrated on the top of the gear transmission mechanism to visually monitor the working status of the piston.

8. A safety control valve cooperating with a pneumatic actuator according to any one of claims 1 to 7, comprising a valve body, a valve seat, a valve core, a valve stem and a sealing assembly, characterized in that: The valve stem is connected to the transmission shaft mounting interface of the pneumatic actuator by a snap-fitting manner to ensure that the control instructions of the actuator are accurately transmitted to the valve, thereby achieving a steady-state locking function when the pressure is too high.

9. The safety control valve according to claim 8, characterized in that: When the piston assembly in the pneumatic actuator is in the center position, the valve remains closed; when the piston assembly is at the two end positions inside the pneumatic actuator, the valve is in the open state.

10. The safety control valve according to claim 8, characterized in that: The maximum torque that the valve is designed to withstand shall not exceed 70% of the output torque of the matching pneumatic actuator.

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