Automatic drainage device of shifting fork box with pneumatic actuating mechanism structure
By designing an automatic drainage device for the shift fork box of the pneumatic actuator, and utilizing check valves and regular ventilation and drying measures, the problem of transmission failure caused by water accumulation and freezing in the shift fork box was solved, ensuring the safe and stable operation of the chemical plant.
Patent Information
- Application Number
- CN202520467612.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-03-18
AI Technical Summary
Water ingress into the shift fork box of pneumatic actuators in chemical plants can cause transmission failure, especially in low-temperature environments where freezing can lead to valve malfunction, affecting safe production. Furthermore, existing periodic inspection methods may not be adequate.
An automatic drainage device for a pneumatic actuator shift fork box was designed. It adopts a combination structure of piston cylinder, shift fork box, spring cylinder and check valve. The check valve automatically controls the drainage and drying of accumulated water. It is connected to the outside through a connecting pipe and is combined with regular ventilation and drying maintenance.
It effectively prevents water accumulation and freezing in the shift fork box, maintains normal transmission function, reduces safety hazards of the device, and improves the reliability and efficiency of inspection.
Smart Images
Figure CN223754777U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of control valves, and particularly relates to an automatic drainage device for a structure yoke box of a pneumatic actuator. BACKGROUND
[0002] A pneumatic actuator is usually selected for a chemical device in a place where a reliable instrument air source is available, and the pneumatic actuator is mostly driven by a yoke structure, which is generally integrated in a yoke box.
[0003] The pneumatic actuator of the chemical device has a problem of water entering the yoke box due to insufficient protection level or long running time and insufficient maintenance. When the water in the yoke box accumulates to a certain degree and the ambient temperature is lower than 0 DEG C, the water in the yoke box will freeze, which will cause the yoke transmission function to fail. When the valve needs to be actuated, the valve will be "refused to actuate" due to the failure of the yoke transmission function, which will eventually affect the safe production of the device.
[0004] The method of regular inspection is generally adopted for the water entering the yoke box, but the number of the actuators of the chemical device is huge, and the yoke box structures of the actuators are not the same, so there may be a situation that the inspection is not thorough, which brings certain risks and hidden dangers to the safe and stable operation of the chemical device. CONTENT OF THE UTILITY MODEL
[0005] The application aims to provide an automatic drainage device for a yoke box of a pneumatic actuator, so as to solve the technical problem of the yoke transmission function failure caused by the water accumulation in the yoke box of the pneumatic actuator.
[0006] The above technical purpose of the application is achieved by the following technical scheme: the automatic drainage device for the yoke box of the pneumatic actuator comprises a piston cylinder, a yoke box and a spring cylinder, the piston cylinder has a piston and a piston rod, the piston rod penetrates through the yoke box and is inserted into the spring cylinder, the end of the piston rod in the spring cylinder is provided with a baffle, a return spring is arranged on the piston rod in the spring cylinder, a connecting barrel is arranged on the piston rod in the yoke box, the connecting barrel is rotationally connected with a rotating barrel, and the low position of the yoke box is communicated with a check valve through a connecting pipe.
[0007] Further, the connecting pipe is provided with a three-way valve, and the side opening of the three-way valve is closed by plugging.
[0008] Compared with the prior art, the present application has the following advantages: by setting the check valve, when the weight of the accumulated water in the fork box is greater than the spring restoring force of the check valve, the check valve is automatically opened to make the fork box communicate with the outside, and the internal accumulated water is discharged from the connecting pipe and the check valve; when the weight of the accumulated water is less than the spring restoring force of the check valve, the check valve is automatically closed to cut off the flow circuit, and the side opening of the three-way valve is regularly connected with external instrument air by the staff according to the actual situation to blow, ventilate and dry the fork box, so that the inside of the fork box is kept dry, and the application and popularization are good. BRIEF DESCRIPTION OF DRAWINGS
[0009] Figure 1 It is the structural drawing of the present application.
[0010] In the figure: 1, piston cylinder; 2, fork box; 3, spring cylinder; 4, piston; 5, piston rod; 6, baffle; 7, reset spring; 8, connecting cylinder; 9, rotating cylinder; 10, connecting pipe; 11, check valve; 12, three-way valve. DETAILED DESCRIPTION
[0011] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the accompanying drawings in the embodiments of the present application.
[0012] In the description of the application, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or positional 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 devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0013] In the first embodiment of the present application, as shown in Figure 1 The automatic drainage device of the fork box of the pneumatic actuator structure, characterized in that it comprises a piston cylinder 1, a fork box 2 and a spring cylinder 3, the piston cylinder 1 has a piston 4 and a piston rod 5, the piston rod 5 passes through the fork box 2 and is inserted into the spring cylinder 3, the end of the piston rod 5 located in the spring cylinder 3 is provided with a baffle 6, a reset spring 7 is arranged on the piston rod 5 located in the spring cylinder 3, a connecting cylinder 8 is arranged on the piston rod 5 located in the fork box 2, a rotating cylinder 9 is rotatably connected with the connecting cylinder 8, and the low position of the fork box 2 is communicated with a check valve 11 through a connecting pipe 10;
[0014] The connecting pipe 10 is provided with a three-way valve 12, and the side opening of the three-way valve 12 is closed by plugging.
[0015] In the above technical solution, the check valve 11 is a swing check valve, which adopts a conventional design in the art, and can be selected according to API 6D Pipeline Valve Specification, GB / T 12236 Steel Swing Check Valve for Petroleum, Petrochemical and Related Industries, or Valve Design Manual.
[0016] By adopting the above technical solution, the specific embodiment of the utility model is that when the weight of the accumulated water in the yoke box 2 is greater than the spring restoring force of the check valve 11, the check valve 11 is automatically opened to make the yoke box 2 communicate with the outside, and the internal accumulated water is discharged from the connecting pipe 10 and the check valve 11; when the weight of the accumulated water is less than the spring restoring force of the check valve 11, the check valve 11 is automatically closed to cut off the flow circuit, and the side opening of the three-way valve 12 is connected to the external instrument air by the staff according to the actual situation to regularly blow, ventilate and dry the yoke box 2, so that the inside of the yoke box is kept dry.
[0017] The above is only the preferred embodiment of the present application, and it should be noted that those skilled in the art can make several improvements without departing from the principles of the present application, and these improvements should also be considered within the protection scope of the present application.
Claims
1. A pneumatic actuator structure shift fork box automatic drainage device, characterized in that, Including piston cylinder (1), shift fork box (2) and spring cylinder (3), piston cylinder (1) have piston (4) and piston rod (5) in, piston rod (5) passes through shift fork box (2) and inserts spring cylinder (3), the end of piston rod (5) in spring cylinder (3) has baffle (6), and reset spring (7) is established on the piston rod (5) in spring cylinder (3), the piston rod (5) in shift fork box (2) is equipped with connecting barrel (8), rotary drum (9) is rotatably connected with connecting barrel (8), and the low position of shift fork box (2) is communicated with check valve (11) through connecting pipe (10).
2. The automatic drain device for the pneumatic actuator structure shift fork box according to claim 1, characterized in that: Three-way valve (12) is provided on the connecting pipe (10), and the side opening of the three-way valve (12) is closed by plugging.