Over-temperature protection control gas circuit of shut-off valve

Abstract

The utility model relates to the technical field of shut-off valves, and provides a shut-off valve overtemperature protection control gas circuit which comprises instrument air and a shut-off valve, the instrument air is divided into a power gas circuit and an execution gas circuit, the power gas circuit is provided with a first pneumatic control valve, and the first pneumatic control valve is connected with the two ends of the shut-off valve and used for driving the shut-off valve to be opened or closed. The execution gas circuit is provided with a selection valve used for switching manual control and automatic control, the selection valve is connected with the first pneumatic control valve and used for controlling on-off of the first pneumatic control valve, a manual control position of the selection valve is connected with instrument air, an automatic control position of the selection valve is connected with an electromagnetic valve, the electromagnetic valve is connected with the instrument air, and the execution gas circuit is used for controlling the first pneumatic control valve to act. Therefore, the direction of the power gas circuit entering the shut-off valve is changed, when the shut-off valve is closed, rapid valve closing can be achieved under the combined action of the elastic reset force of the spring and the compressed gas, the problem of closing jamming of the shut-off valve is solved, and the stability and reliability of the control gas circuit are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of shut-off valves, in particular to a shut-off valve over-temperature protection control gas circuit. Background Art

[0002] A shut-off valve is a valve used to control the flow of fluid (gas or liquid). The shut-off valve's control air circuit refers to a system that regulates the gas flow to control the valve's opening and closing. Current shut-off valves typically use single-acting valves, where the actuator cylinder receives air from a single end, relying on instrument air pressure to open the valve. The shut-off valve relies solely on the spring force within the cylinder to close the shut-off valve. Over time, the spring ages, leading to prolonged closing times or even complete inability to close the valve. Furthermore, existing control air circuits lack over-temperature protection and shutdown, posing a significant safety hazard. Utility Model Content

[0003] The purpose of the utility model is to provide a shut-off valve over-temperature protection control gas circuit, solve the above technical problems, improve the stability and reliability of the control gas circuit, and realize the over-temperature self-locking function of the control gas circuit.

[0004] The utility model is realized by the following technical solutions: a shut-off valve over-temperature protection control air circuit, including instrument air and shut-off valve;

[0005] Instrument air is divided into power air circuit and execution air circuit;

[0006] The power gas circuit is provided with a first gas-controlled valve, which is connected to both ends of the shut-off valve to drive the shut-off valve to open or close;

[0007] The execution air circuit is provided with a selection valve for switching between manual control and automatic control. The selection valve is connected to the first air-controlled valve to control the on and off of the first air-controlled valve. The manual control position of the selection valve is connected to the instrument air, and the automatic control position of the selection valve is connected to a solenoid valve, which is connected to the instrument air.

[0008] Furthermore, a second air-controlled valve is connected between the selection valve and the first air-controlled valve, and the instrument air is connected to the second air-controlled valve after being connected to the one-way valve and the fusible plug in sequence to control the on and off of the second air-controlled valve.

[0009] Preferably, a pressure charging valve for controlling the charging conduction of the second air-controlled valve is connected to the front end of the one-way valve.

[0010] Preferably, the first air-controlled valve is a two-position four-way valve, and the second air-controlled valve is a two-position two-way valve.

[0011] Furthermore, the selection valve is a three-position four-way valve, and the solenoid valve is a two-position three-way valve.

[0012] Furthermore, a speed regulating valve for adjusting the valve opening speed is provided between the first air-controlled valve and the valve opening end of the shut-off valve.

[0013] Furthermore, the instrument air is connected to a pressure reducing valve and a safety valve.

[0014] The utility model has at least the following advantages and beneficial effects:

[0015] (1) By dividing the instrument air into a power air circuit and an execution air circuit, the execution air circuit is used to control the action of the first air-controlled valve, thereby changing the direction in which the power air circuit enters the shut-off valve. When the shut-off valve is closed, it can be quickly closed under the combined action of the spring elastic reset force and the compressed gas, thus solving the problem of the shut-off valve being blocked and improving the stability and reliability of the control air circuit;

[0016] (2) Through the setting of the second air control valve, the one-way valve and the fusible plug, in the case of over-temperature, the control air circuit automatically releases air and cuts off the instrument air passage, realizing the over-temperature self-locking of the control air circuit, preventing the instrument air from leaking all the time, and effectively avoiding the instrument air pipeline being in the state of air discharge all the time, causing the pressure of the instrument air pipeline network to drop and causing other secondary safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A diagram showing the natural closing state of a shut-off valve over-temperature protection control gas circuit provided by the utility model;

[0019] Figure 2 This is a valve opening state diagram of a shut-off valve over-temperature protection control gas circuit provided by the utility model;

[0020] Figure 3 This is an over-temperature state diagram of the shut-off valve over-temperature protection control gas circuit provided by the utility model;

[0021] Icons: 1-Instrument air, 2-Shut-off valve, 3-First air control valve, 4-Selection valve, 5-Solenoid valve, 6-Second air control valve, 7-Check valve, 8-Fusible plug, 9-Charging valve, 10-Speed ​​regulating valve, 11-Pressure reducing valve, 12-Safety valve, 13-First pressure gauge, 14-Second pressure gauge, 15-Check valve. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0024] Example

[0025] like Figure 1-3 As shown, in this embodiment, a shut-off valve over-temperature protection control gas circuit is mainly disclosed, including instrument air 1 and a shut-off valve 2. The instrument air 1 is used as a compressed gas source and is divided into a power gas circuit and an execution gas circuit;

[0026] Among them, the power air circuit is provided with a first air-controlled valve 3, which is connected to both ends of the shut-off valve 2 to drive the shut-off valve 2 to open or close the valve; it should be noted that the air intake of the original actuator cylinder of the shut-off valve 2 is changed from single-acting to double-acting, and the compressed gas is controlled to enter the air intake end of the shut-off valve 2 through the first air-controlled valve 3; when the valve is opened, the compressed gas acts on one end of the valve plate inside the shut-off valve 2, pushing the valve plate to move, so that the spring in the valve is compressed; when the valve is closed, the compressed gas acts on the other end of the valve plate inside the shut-off valve 2, and the valve plate moves under the combined action of the elastic restoring force of the spring and the compressed gas, effectively solving the problem of the shut-off valve 2 being stuck in closing, reducing the closing time of the valve, and even in the case of aging of the spring, the valve can still be closed by relying on the shut-off air source, thereby improving the stability and reliability of the valve;

[0027] The execution air circuit is provided with a selection valve 4 for switching between manual control and automatic control. The selection valve 4 is connected to the first air-controlled valve 3 to control the on-off of the first air-controlled valve 3. The manual control position of the selection valve 4 is connected to the instrument air 1, and the automatic control position of the selection valve 4 is connected to the solenoid valve 5, which is connected to the instrument air 1. It should be noted that the selection valve 4 can have three control gears, corresponding to automatic, manual opening and manual closing respectively.

[0028] Specifically, when the selector valve 4 is in the automatic gear position, the air supply of the selector valve 4 is controlled by the front-end solenoid valve 5. The solenoid valve 5 is activated after being energized, so that the instrument air 1 is conducted to the solenoid valve 5 and then acts on the first air-controlled valve 3 after passing through the selector valve 4, so that the first air-controlled valve 3 is activated, and the direction of the power air in the power air circuit entering the shut-off valve 2 is changed, so that the shut-off valve 2 is converted from a closed valve to an open valve; after the solenoid valve 5 loses power, the solenoid valve 5 is activated, cutting off the connection between the instrument air 1 and the selector valve 4, so that the first air-controlled valve 3 is activated and returns to a natural state, changing the direction of the power air in the power air circuit entering the shut-off valve 2, so that the shut-off valve 2 is converted from an open valve to a closed valve;

[0029] When the selector valve 4 is in the manual open position, the selector valve 4 is directly connected to the instrument air 1, acting on the first air control valve 3, causing the first air control valve 3 to operate, changing the direction of the power air in the power air circuit entering the shut-off valve 2, so that the shut-off valve 2 is converted from a closed valve to an open valve;

[0030] When the selector valve 4 is in the manual closing position, the selector valve 4 is cut off, causing the first air control valve 3 to operate and return to the natural state, changing the direction of the power air in the power air circuit entering the shut-off valve 2, so that the shut-off valve 2 is converted from an open valve to a closed valve;

[0031] Furthermore, in a specific implementation, a second air-controlled valve 6 is connected between the selector valve 4 and the first air-controlled valve 3 provided in the embodiment of the present utility model. The instrument air 1 is connected to the second air-controlled valve 6 by sequentially connecting a one-way valve 7 and a fusible plug 8 to control the on-off of the second air-controlled valve 6. Preferably, a charging valve 9 for controlling the charging conduction of the second air-controlled valve 6 is connected to the front end of the one-way valve 7.

[0032] Specifically, such as Figure 1 As shown, this is a control air circuit diagram when the selector valve 4 is in the automatic gear position and the shut-off valve 2 is in the naturally closed state. The solenoid valve 5 is not energized, the selector valve 4 is not conducting, the first air-controlled valve 3 is in the natural state, and the power air in the power air circuit passes through the first air-controlled valve 3 and enters the shut-off valve 2 from the right end, and the valve is closed under the joint action of the spring;

[0033] like Figure 2 As shown, this is a control air circuit diagram of the selector valve 4 in the automatic gear position and the shut-off valve 2 in the open state. The solenoid valve 5 is energized, the selector valve 4 is turned on, the charging valve 9 is opened, and the instrument air 1 acts on the second air-controlled valve 6, causing the second air-controlled valve 6 to be actuated and turned on, and then the charging valve 9 is closed. At this time, the second air-controlled valve 6 is kept turned on under the action of the one-way valve 7. The instrument air 1, as the actuating air in the actuating air circuit, passes through the solenoid valve 5, the selector valve 4, and the second air-controlled valve 6 in sequence to act on the first air-controlled valve 3, causing the first air-controlled valve 3 to be actuated. The instrument air 1, as the motive air in the motive air circuit, passes through the first air-controlled valve 3 and enters the shut-off valve 2 from the left end thereof, thereby opening the valve.

[0034] like Figure 3As shown, this is a schematic diagram of the control gas circuit over-temperature state when the selection valve 4 is in the automatic gear. When the temperature of the control gas circuit exceeds the set value, the fusible plug 8 loses air and automatically releases the instrument air 1 in the control gas circuit. The force acting on the second air control valve 6 to maintain conduction is reduced, causing the second air control valve 6 to operate, cutting off the instrument air 1 passage, and realizing self-locking of the control gas circuit due to over-temperature, preventing the instrument air 1 from leaking all the time, and effectively avoiding the instrument air 1 pipeline being in the state of air discharge all the time, resulting in a drop in the pressure of the instrument air 1 pipeline network and causing other secondary safety risks; in addition, for the purpose of safety protection, after the fusible plug 8 loses air, if the shut-off valve 2 needs to be opened again, it is necessary to manually reopen the charging valve 9 on site to inflate the control gas circuit and return the second air control valve 6 to the conduction state.

[0035] Furthermore, in specific implementation, the first air-controlled valve 3 provided in the embodiment of the present invention is a two-position four-way valve, the second air-controlled valve 6 is a two-position two-way valve; the selection valve 4 is a three-position four-way valve, and the solenoid valve 5 is a two-position three-way valve.

[0036] Furthermore, in a specific implementation, a speed regulating valve 10 for adjusting the valve opening speed is provided between the above-mentioned first air-controlled valve 3 and the valve opening end of the shut-off valve 2 provided in the embodiment of the utility model; specifically, the speed regulating valve 10 can adopt existing technology to control the valve opening speed of the shut-off valve 2 by adjusting the gas flow, thereby improving operational flexibility.

[0037] Furthermore, in specific implementation, the above-mentioned instrument air 1 provided in the embodiment of the present utility model is connected with a pressure reducing valve 11 and a safety valve 12; specifically, the pressure reducing valve 11 and the safety valve 12 are both arranged on the main road of the control gas circuit; the pressure reducing valve 11 can reduce the higher pressure gas source in the instrument air 1 pipeline network to the working pressure required by the system, ensuring the normal operation of subsequent equipment and instruments; the safety valve 12 overflows and releases air when the control gas circuit is over-pressured, avoiding damage to subsequent equipment and instruments caused by damage to the pressure reducing valve 11, thereby improving the safety and reliability of the gas circuit.

[0038] In addition, the main line of the control gas circuit is connected to a first pressure gauge 13 for monitoring the total air pressure of the control gas circuit; the passage between the solenoid valve 5 and the selection valve 4 is connected to a second pressure gauge 14 for detecting the air pressure in the execution gas circuit; the air outlet end of the control gas circuit is connected to a check valve 15 to prevent gas backflow.

[0039] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A shut-off valve over-temperature protection control air circuit, comprising instrument air (1) and a shut-off valve (2), It is characterized by: The instrument air (1) is divided into a power air circuit and an execution air circuit; The power gas circuit is provided with a first gas-controlled valve (3), which is connected to both ends of the shut-off valve (2) and is used to drive the shut-off valve (2) to open or close. The execution air circuit is provided with a selection valve (4) for switching between manual control and automatic control. The selection valve (4) is connected to the first air control valve (3) for controlling the on / off of the first air control valve (3). The manual control position of the selection valve (4) is connected to the instrument air (1). The automatic control position of the selection valve (4) is connected to a solenoid valve (5), and the solenoid valve (5) is connected to the instrument air (1).

2. A shut-off valve over-temperature protection control gas circuit according to claim 1, characterized in that: A second air-controlled valve (6) is connected between the selection valve (4) and the first air-controlled valve (3); the instrument air (1) is connected to the second air-controlled valve (6) by sequentially connecting a one-way valve (7) and a fusible plug (8) to control the on / off state of the second air-controlled valve (6).

3. A shut-off valve over-temperature protection control gas circuit as claimed in claim 2, characterized in that: The front end of the one-way valve (7) is connected to a pressure charging valve (9) for controlling the charging conduction of the second air-controlled valve (6).

4. A shut-off valve over-temperature protection control gas circuit as claimed in claim 2, characterized in that: The first air-controlled valve (3) is a two-position four-way valve, and the second air-controlled valve (6) is a two-position two-way valve.

5. The shut-off valve over-temperature protection control gas circuit according to claim 1, characterized in that: The selection valve (4) is a three-position four-way valve, and the solenoid valve (5) is a two-position three-way valve.

6. A shut-off valve over-temperature protection control gas circuit according to claim 1, characterized in that: A speed regulating valve (10) for adjusting the valve opening speed is provided between the first air control valve (3) and the valve opening end of the shut-off valve (2).

7. The shut-off valve over-temperature protection control gas circuit according to claim 1, characterized in that: The instrument air (1) is connected to a pressure reducing valve (11) and a safety valve (12).

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