Auxiliary automatic closing device of shut-off valve

Abstract

The utility model discloses an auxiliary automatic closing device of a shut-off valve, which comprises an actuating mechanism connected with a valve body of the shut-off valve and used for operating the opening and closing of the valve according to a control signal. The electromagnetic valve is used for controlling the flow direction of the gas; the first pilot valve is provided with three ports, and different passages are switched according to whether the control end has pressure or not so as to control the air pressure change in the air cylinder; the structure of the second pilot valve is the same as that of the first pilot valve; the first three-way valve is used for manually switching gas circuits and cutting off a control gas source of the first pilot valve during testing or maintenance; the second three-way valve and the first three-way valve are the same in structure. According to the scheme, the technical problems that in the long-term use process of a traditional shut-off valve, when the traditional shut-off valve cannot be reliably closed due to spring elasticity weakening and valve clamping stagnation, emergency response is not in time, and consequently a production system is disordered, a treatment device overflows, and safety and environmental protection risks of upstream and downstream facilities are likely to be caused can be solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of shut-off valve, especially relates to shut-off valve auxiliary automatic closing device. BACKGROUND

[0002] In industrial production environments, shut-off valves serve as critical safety equipment for rapidly shutting off fluid flow in emergency situations to prevent accidents and reduce environmental damage. However, traditional shut-off valve systems have some inherent problems and limitations. First, the reset spring of a shut-off valve that has been in the open position for a long time may lose its elasticity due to prolonged compression, resulting in insufficient closing force in emergency situations. Second, the shut-off valve may experience sticking due to impurity accumulation or mechanical wear, making the valve unable to operate smoothly when it needs to be closed, increasing safety risks. Additionally, many existing shut-off valve systems do not have an online testing function, meaning that the valve's function cannot be monitored and tested in real time during normal production, increasing maintenance difficulty and potentially leading to potential faults not being discovered in a timely manner.

[0003] To address these issues, some improvements have been proposed in the prior art, but these solutions often have shortcomings. On the one hand, some solutions require complex hardware upgrades and high costs, making them difficult to be widely applied in actual production environments. For example, some modification solutions require production to be stopped for maintenance, which not only results in production loss but also generates additional maintenance costs and labor costs. On the other hand, although some improvement solutions add auxiliary closing functions, they are unstable in actual application and cannot completely solve the problems of valve sticking and spring elasticity reduction. In addition, many improved systems still lack flexibility, making online testing and maintenance operations inconvenient and increasing the workload of operators. INVENTION CONTENTS

[0004] The utility model aims at providing a shut-off valve auxiliary automatic closing device to solve the technical problem that the traditional shut-off valve cannot be reliably closed due to spring elasticity reduction and valve sticking during long-term use, resulting in delayed emergency response and causing production system disorder, device tank bursting, and safety and environmental risk of upstream and downstream facilities.

[0005] To achieve the above-mentioned purpose, the specific technical scheme of the utility model is as follows: a shut-off valve auxiliary automatic closing device, comprising:

[0006] An actuator is connected to the shut-off valve body and is used to operate the opening and closing of the valve according to the control signal;

[0007] An electromagnetic valve is used to control the flow of gas;

[0008] Pilot valve one, with three ports, switches different passages according to whether the control end has pressure, to control the pressure change in the cylinder.

[0009] Pilot valve two, with the same structure as pilot valve one.

[0010] Three-way valve one, used for manual switching of the air circuit, to cut off the control air source of pilot valve one during testing or maintenance.

[0011] Three-way valve two, with the same structure as three-way valve one.

[0012] Silencer, multiple silencers are used to reduce noise generated during exhaust.

[0013] Preferably, the auxiliary automatic closing device of the shut-off valve further comprises:

[0014] Limit switch, installed on the actuator, used to detect whether the valve has been fully opened or closed, and send corresponding signals to the control system.

[0015] Cam valve, installed on the actuator in cooperation with the limit switch, used to accurately detect and feedback the opening and closing state of the valve.

[0016] Filter regulator, used to purify compressed air and regulate its pressure.

[0017] Preferably, a lubricator is installed on the air pipe line of the filter regulator, which adds an appropriate amount of lubricating oil to the system to reduce wear between moving parts.

[0018] Preferably, a bleed valve is connected to the exhaust pipe line of the actuator.

[0019] A safety valve is connected to the air circuit pipe line of the pilot valve one, used to monitor the system pressure.

[0020] Preferably, a manual test valve is installed in the air circuit pipe line of the cam valve, used to isolate part of the system for testing or maintenance.

[0021] Preferably, both the pilot valve one and the pilot valve two can switch different passages according to whether the control end has pressure, to control the action of the actuator.

[0022] Preferably, the three-way valve one cuts off the control air source of the pilot valve one during testing and maintenance, allowing bypass operation of the system without affecting the function of the valve.

[0023] Preferably, the filter regulator is used to purify compressed air and regulate its pressure, ensuring that the air flow entering the system is clean and the pressure is stable.

[0024] Preferably, the pilot valve two is connected with the three-way valve one, the actuator, the cam valve, the electromagnetic valve and the three-way valve one through the gas circuit pipeline respectively, and the three-way valve two is connected with the actuator, the cam valve and the pilot valve two through the gas circuit pipeline respectively.

[0025] Preferably, the pilot valve one is connected with the electromagnetic valve, the relief valve, the three-way valve one and the safety valve through the gas circuit pipeline respectively, and the three-way valve one is connected with the electromagnetic valve, the pilot valve one and the pilot valve two through the pipeline.

[0026] The auxiliary automatic closing device of the shut-off valve has the following advantages:

[0027] The auxiliary automatic closing device of the shut-off valve, by designing the auxiliary pneumatic drive circuit and the bypass function, effectively solves the problem that the traditional shut-off valve cannot be reliably closed due to the weakening of spring elasticity and valve jamming during long-term use, significantly improves the emergency response capability and reliability of the system. The newly added auxiliary closing function ensures that the valve can be quickly and stably closed in an emergency, avoiding potential risks such as production system disorder and device tank explosion, and ensuring the safety and environmental protection of upstream and downstream facilities. In addition, the design of the bypass circuit allows online testing and maintenance of the shut-off valve without affecting normal production, greatly improving the maintainability and operational flexibility of the system, reducing the need for production maintenance, and reducing operating costs. Overall, this scheme not only enhances the safety and stability of the system, but also greatly reduces the cost of transformation and maintenance through optimized design and component utilization, with significant technological progress and practical value. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0029] Figure 1 The overall structure process flow chart of the present application;

[0030] Figure 2 The overall structure front view schematic diagram of the present application;

[0031] Figure 3 The overall structure perspective view schematic diagram of the present application;

[0032] Figure 4 The overall structure perspective view schematic diagram of the present application;

[0033] Figure 5The whole structure top view schematic diagram of the utility model;

[0034] Figure 6 The whole structure left view schematic diagram of the utility model.

[0035] Marked in the figure: 1, actuating mechanism;2, electromagnetic valve;3, limit switch;4, muffler;5, cam valve;6, relief valve;7, pilot valve one;8, three-way valve one;9, safety valve;10, filter regulator;11, manual test valve;12, lubricator;13, three-way valve two;14, pilot valve two. DETAILED DESCRIPTION

[0036] Hereinafter, only certain exemplary embodiments are simply described.As can be appreciated by those skilled in the art, the described embodiments can be modified in various different manners without departing from the spirit or scope of the embodiments of the present application.As such, the drawings and descriptions are to be regarded as illustrative in nature and not restrictive.

[0037] In the description of the embodiments of the present application, it is to be understood that the orientation or positional relationship indicated by the terms "length", "vertical", "horizontal", "top", "bottom" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0038] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features.In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0039] In the embodiments of the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated;It can be mechanically connected, or it can be electrically connected, or it can be communicated;It can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements or the interaction relationship between two elements.For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0041] To better understand the purpose, structure, and function of this utility model, the auxiliary automatic shut-off device for shut-off valves of this utility model will be described in further detail below with reference to the accompanying drawings.

[0042] like Figures 1-6 As shown, the automatic shut-off device for the shut-off valve of this utility model includes an actuator 1, a solenoid valve 2, a limit switch 3, a silencer 4, a cam valve 5, a relief valve 6, a pilot valve 1 7, a three-way valve 1 8, a safety valve 9, a filter regulator 10, a manual test valve 11, a lubricator 12, a three-way valve 2 13, and a pilot valve 2 14.

[0043] Actuator 1 is connected to the valve body of the shut-off valve and is used to operate the valve opening and closing according to the control signal. Solenoid valve 2 is used to control the gas flow direction. Solenoid valve 2 is connected to the pipeline gas line of filter regulator 10.

[0044] Among them, actuator 1 is a pneumatic actuator, which is an outer cylinder and an inner compression spring.

[0045] Pilot valve 17 has three ports and switches between different paths depending on whether there is pressure at the control end to control the air pressure change in the cylinder; pilot valve 214 has the same structure as pilot valve 17.

[0046] Three-way valve 18 is used to manually switch the air path and cut off the control air source of pilot valve 17 during testing or maintenance; three-way valve 213 has the same structure as three-way valve 18.

[0047] Multiple silencers 4 are connected to the relief valve 6, cam valve 5, pilot valve 1 7, three-way valve 1 8, safety valve 9, manual test valve 11, and pilot valve 2 14 respectively, to reduce the noise generated during exhaust.

[0048] Limit switch 3 is installed on actuator 1 to detect whether the valve has been fully opened or closed and to send a corresponding signal to the control system; cam valve 5 and limit switch 3 are installed together on actuator 1 to accurately detect and provide feedback on the opening and closing status of the valve, ensuring that the system can accurately determine whether the valve has been fully opened or closed and perform corresponding control operations accordingly; filter regulator 10 is used to purify compressed air and regulate its pressure.

[0049] A lubricator 12 is installed on the air line of the filter regulator 10 to add the right amount of lubricating oil into the system to reduce the wear and tear of moving parts. A relief valve 6 is connected on the exhaust line of the actuator 1, which is connected to the muffler 4 through a line;

[0050] A safety valve 9 is connected on the air line of the pilot valve 1 to monitor the pressure of the system. Once the pressure is detected to exceed the set value, it will automatically open to release the excess gas to protect the whole pneumatic system from overpressure damage.

[0051] A manual test valve 11 is installed on the air line of the cam valve 5 to isolate part of the system for testing or maintenance, to ensure that the function of each component can be checked and verified without interfering with the operation of the whole system.

[0052] Among them, each in the scheme is connected through a pipeline, and the pipeline is an instrument tube tubing pipeline;

[0053] Both the pilot valve 1 and the pilot valve 2 can switch different paths according to whether there is pressure at their control end, thereby controlling the action of the actuator 1.

[0054] As shown in Figure 1 Specifically, both the pilot valve 1 and the pilot valve 2 have three ports. When there is pressure at the control end, port I and port II are in a conductive state, and port I and port III are in a disconnected state. When there is no pressure at the control end, port I and port III are in a conductive state, and port I and port II are in a disconnected state.

[0055] The three-way valve 1 is used to cut off the control gas source of the pilot valve 1 during testing and maintenance, allowing the system to be operated by bypassing without affecting the function of the valve. The filter regulator 10 is used to purify compressed air and regulate its pressure, ensuring that the airflow entering the system is clean and stable.

[0056] The pilot valve 2 is connected through an air line to the three-way valve 1, the actuator 1, the cam valve 5, the solenoid valve 2, and the three-way valve 1, respectively. The three-way valve 2 is connected through an air line to the actuator 1, the cam valve 5, and the pilot valve 2, respectively.

[0057] The pilot valve 1 is connected through an air line to the solenoid valve 2, the relief valve 6, the three-way valve 1, and the safety valve 9. The three-way valve 1 is connected through a line to the solenoid valve 2, the pilot valve 1, and the pilot valve 2.

[0058] At the same time, the relief valve 6 is connected through a line to the manual test valve 11, and the safety valve 9 is connected through a line to the filter regulator 10, the solenoid valve 2, the pilot valve 1, and the pilot valve 2.

[0059] The scheme is designed to assist the closing of the pneumatic circuit, the main function is to increase the closing force of the valve when the valve is closed, to overcome the difficulty of valve body jamming and spring elasticity weakening.

[0060] The first stage: change the temporarily connected hose to Tubing pipe to form a fixed circuit, add a three-way valve 13, in emergency, personnel open the three-way valve 13 to achieve auxiliary closing, in emergency, personnel open the three-way valve 13 according to emergency responsibilities, to achieve the closing of the valve. Although this method greatly shortens the emergency response time of personnel, it still exceeds the normal closing time of the valve by nearly 60 seconds, and can only be used as a temporary control measure.

[0061] The second stage: upgrade the first stage, change the original manual opening of the three-way valve 13 to automatic control, personnel realize automatic exhaust of the cylinder inlet end and automatic inflation of the exhaust end by adding a three-way valve 13, and use a 3NC three-way valve instead of a 3NO three-way valve to overcome the difficulty of spare parts. After testing, it can realize automatic closing and does not affect the original function of the valve.

[0062] The third stage: after rechecking the pneumatic control circuit, it is found that although it does not affect opening and closing, it cannot determine whether the valve body is actually abnormal, and cannot timely find problems and develop maintenance strategies. In order to realize the closing of the auxiliary function under the condition of allowing, the valve is tested, and the pneumatic control circuit is optimized again to increase the bypass circuit pilot valve 14, as shown in Figure 1 , which realizes that when put into use, it can ensure the normal closing of the valve, and when the production is stopped for repair, the auxiliary circuit can be temporarily bypassed to test the opening and closing of the valve, and observe whether the valve is abnormal.

[0063] The working principle of the auxiliary automatic closing device of the valve is that the control gas enters the control circuit through the filter regulator 10, when the electromagnetic valve 2 is powered on, the gas source circuit is connected, the control gas passes through the three-way valve 8, at this time the pilot valve 7 control end has pressure, the pilot valve 7 is connected, the control gas enters the relief valve 6 through the pilot valve 7 and then charges the cylinder, the pressure in the cylinder rises, the spring is compressed to make the valve open;

[0064] When the electromagnetic valve 2 loses power or the three-way valve 8 is opened, the control gas leaks, and finally the pressure in the cylinder is exhausted, the spring restores the deformation, drives the actuator 1 to act, and then the valve is closed;

[0065] When the valve is closed, the pressure in the cylinder is exhausted, but due to the problem of the valve body below, the restoring pressure of the spring is not enough to close the valve, therefore, the pilot valve two 14 is additionally arranged, when the valve needs to be closed, the control end of the newly added pilot valve two 14 is pressureless, the I port and the III port on the surface are communicated, the control gas can enter the other end of the actuator 1 through the pilot valve two 14, at this time, the spring restoring pressure and the actuator 1 are jointly acted, and then the actuator 1 is actuated, and when the valve needs to be opened, the control end of the newly added pilot valve two 14 is pressurized, the I port and the II port of the pilot valve two 14 are communicated, the compressed gas cannot enter the other side of the actuator 1, and the opening of the valve is not affected.

[0066] The three-way valve one 8 and the pilot valve two 14 are auxiliary functions, can bypass at any time, when the newly added three-way valve one 8 is closed, the control circuit of the pilot valve two 14 cannot be communicated, therefore, the auxiliary function cannot be played.

[0067] It can be understood that the utility model is described through some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the utility model.In addition, under the guidance of the utility model, these features and embodiments can be modified to adapt to specific conditions and materials without departing from the spirit and scope of the utility model.Therefore, the utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the scope protected by the utility model.

Claims

1. A valve-assisted automatic shutoff device, characterized in that, It comprises: an actuator (1) connected to the valve body of the shut-off valve, for operating the opening and closing of the valve according to the control signal; a solenoid valve (2) for controlling the gas flow; a pilot valve I (7) having three ports, for switching different passages according to whether the control end has pressure or not, to control the pressure change in the cylinder; a pilot valve II (14) having the same structure as the pilot valve I (7); a three-way valve I (8) for manually switching the gas circuit, to cut off the control gas source of the pilot valve I (7) during testing or maintenance; a three-way valve II (13) having the same structure as the three-way valve I (8); silencers (4), which are multiple, for reducing the noise generated during exhaust.

2. The shutoff valve assisted automatic closure apparatus of claim 1, wherein: It also comprises: limit switches (3) installed on the actuator (1), for detecting whether the valve has been fully opened or closed, and sending corresponding signals to the control system; cam valves (5) installed on the actuator (1) in cooperation with the limit switches (3), for accurately detecting and feeding back the opening and closing state of the valve; filter regulators (10) for purifying compressed air and regulating its pressure.

3. The valve assist automatic closure device of claim 2, wherein: A lubricator (12) is installed on the gas pipeline of the filter regulator (10), which adds an appropriate amount of lubricating oil to the system to reduce the wear between moving parts.

4. The valve assist automatic closure device of claim 3, wherein: A bleed valve (6) is connected to the exhaust pipeline of the actuator (1); A safety valve (9) is connected to the gas circuit pipeline of the pilot valve I (7), for monitoring the system pressure.

5. The valve assist automatic closure device of claim 4, wherein: A manual test valve (11) is installed in the gas circuit pipeline of the cam valve (5), for isolating part of the system for testing or maintenance.

6. The valve assist automatic closure device of claim 5, wherein: Both the pilot valve I (7) and the pilot valve II (14) can switch different passages according to whether their control end has pressure, thereby controlling the action of the actuator (1).

7. The valve assist automatic closure device of claim 6, wherein: The three-way valve I (8) cuts off the control gas source of the pilot valve I (7) during testing and maintenance, allowing bypass operation of the system without affecting the function of the valve.

8. The valve assist automatic closure device of claim 7, wherein: The filter regulator (10) is used to purify compressed air and regulate its pressure, ensuring that the air flow entering the system is clean and the pressure is stable.

9. The valve assist automatic closure device of claim 8, wherein: The pilot valve II (14) is connected to the three-way valve I (8), the actuator (1), the cam valve (5), the solenoid valve (2) and the three-way valve I (8) through the gas circuit pipeline, while the three-way valve II (13) is connected to the actuator (1), the cam valve (5) and the pilot valve II (14) through the gas circuit pipeline.

10. The valve assist automatic closure device of claim 9, wherein: The pilot valve I (7) is connected to the solenoid valve (2), the bleed valve (6), the three-way valve I (8) and the safety valve (9) through the gas circuit pipeline, while the three-way valve I (8) is connected to the solenoid valve (2), the pilot valve I (7) and the pilot valve II (14) through the pipeline.

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