Air source pressure loss position keeping device of pneumatic quick-closing valve

Abstract

The utility model provides a pneumatic quick-closing valve air source pressure loss position keeping device, which is characterized in that a control mechanism comprises a console and a PLC (Programmable Logic Controller), and a detection mechanism comprises an air source pressure sensor; the position keeping mechanism comprises an instrument air source, a filtering pressure reducing valve, a pneumatic position keeping valve, a quick discharging valve, an air cylinder, a pneumatic quick closing valve, a first two-position three-way electromagnetic valve and a second two-position three-way electromagnetic valve, the first two-position three-way electromagnetic valve and the second two-position three-way electromagnetic valve are electrically connected with a PLC, an air source main pipeline is provided with a pressure detection sensor, and the instrument air source is communicated with the filtering pressure reducing valve. The first two-position three-way electromagnetic valve is communicated with a pneumatic position retaining valve; the pneumatic position retaining valve is communicated with a second two-position three-way electromagnetic valve; the second two-position three-way electromagnetic valve is communicated with a quick discharge valve; the quick discharge valve is communicated with an air cylinder; the device can perform cylinder air source pressure protection through the pneumatic position retaining valve when the air source loses pressure, so that the operation safety of equipment is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of management systems, in particular to a pneumatic quick-closing valve air source pressure loss position-keeping device. Background Art

[0002] Pneumatic quick-closing valves are widely used. They are often used in the heating pipelines of steam turbine generator sets as safety protection facilities to prevent steam backflow from causing overspeed of the unit. Similar applications are also found in many fluid supply control situations: in normal working conditions, the instrument air source passes through the filter pressure reducing valve and then reaches the two-position three-way solenoid valve. After the two-position three-way solenoid valve is energized, the air path opens, and the air source enters the quick exhaust valve, and then enters the pneumatic valve cylinder through the quick exhaust valve to push the piston to open the valve. If the two-position three-way solenoid valve loses power, the two-position three-way valve switches to the exhaust position, and the quick exhaust valve loses air pressure. The air pressure in the cylinder causes the quick exhaust valve to switch to the exhaust position, the cylinder pressure disappears, and the pneumatic quick-closing valve closes under the action of the spring force; in abnormal working conditions, when the air source main line loses pressure abnormally: the instrument air source loses pressure due to external factors such as the air supply air compressor tripping, pipeline leakage, etc., resulting in a drop in air source pressure. Even if the two-position three-way solenoid valve is in the energized open position, the quick exhaust valve inlet pressure is lower than the air source pressure in the cylinder, and the quick exhaust valve automatically switches to the exhaust position. The air pressure in the cylinder is quickly released, and the pneumatic valve quickly closes, seriously affecting the safe operation of the equipment. Therefore, a pneumatic quick-closing valve air source pressure loss retention device is proposed to solve the above problem. Utility Model Content

[0003] In view of this, the purpose of the present invention is to provide a pneumatic quick-closing valve air source pressure loss retaining device to solve the above-mentioned problems in the prior art.

[0004] The technical solutions adopted in this utility model are as follows:

[0005] A pneumatic quick-closing valve air source pressure loss holding device, the device includes a control mechanism, a detection mechanism and a holding mechanism, the control mechanism includes a console and a PLC controller, the detection mechanism includes an air source pressure sensor electrically connected to the PLC controller, the holding mechanism includes an instrument air source, a filter pressure reducing valve, a pneumatic holding valve, a quick exhaust valve, a cylinder, a pneumatic quick-closing valve and a first, second, third, and fourth solenoid valve electrically connected to the PLC controller respectively, the instrument air source is connected to the filter pressure reducing valve, the filter pressure reducing valve is connected to the first, second, third, and fourth solenoid valve, the first, second, third, and fourth solenoid valve is connected to the pneumatic holding valve, the pneumatic holding valve is connected to the second, second, third, and fourth solenoid valve, the quick exhaust valve is connected to the cylinder, the cylinder is connected to the pneumatic quick-closing valve, and the air source pressure sensors are respectively arranged on the air source main line.

[0006] Furthermore, it includes a prompt component, which includes an audible and visual prompter, and the audible and visual prompter is arranged on the console and electrically connected to the PLC controller.

[0007] Furthermore, it includes a display component, which includes a display screen. The display screen is set on the console and is electrically connected to the main PLC controller.

[0008] Furthermore, it includes a power supply component, which includes a battery. The battery is arranged on the console and electrically connected to the PLC controller.

[0009] Compared with the prior art, the beneficial effects of the present invention are:

[0010] The utility model provides a pneumatic quick-closing valve gas source pressure loss retaining device, which can protect the cylinder air pressure through the pneumatic retaining valve when the main line gas source loses pressure, thereby ensuring the safe operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 It is a schematic diagram of the overall structure of the gas source of the pneumatic quick-closing valve in the prior art provided by the embodiment of the utility model.

[0013] Figure 2 This is a schematic diagram of the overall circuit principle of a pneumatic quick-closing valve air source pressure loss retention device provided by an embodiment of the utility model.

[0014] Figure 3 This is a schematic diagram of the overall circuit connection of a pneumatic quick-closing valve air source pressure loss retention device provided by an embodiment of the utility model.

[0015] In the figure, 1. Instrument air source; 2. Filter pressure reducing valve; 3. First two-position three-way solenoid valve; 4. Pneumatic position-holding valve; 5. Second two-position three-way solenoid valve; 6. Quick exhaust valve; 7. Cylinder; 8. Pneumatic quick-closing valve; 9. PLC controller; 10. Air source pressure sensor; 11. Sound and light indicator; 12. Display screen; 13. Battery. DETAILED DESCRIPTION

[0016] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The enumerated embodiments are only used to explain the present invention and are not used to limit the scope of the present invention.

[0017] Example

[0018] Reference Figure 1-Figure 3 The utility model provides a pneumatic quick-closing valve air source pressure loss and position retention device, the device includes a control mechanism, a detection mechanism and a position retention mechanism, the control mechanism includes a console and a PLC controller 9, the detection mechanism includes an air source pressure sensor 10 electrically connected to the PLC controller 9 respectively, the position retention mechanism includes an instrument air source 1, a filter pressure reducing valve 2, a pneumatic position retention valve 4, a quick exhaust valve 6, a cylinder 7, a pneumatic quick-closing valve 8 and a first, two-position, three-way solenoid valve 3 and a second, two-position, three-way solenoid valve 5 electrically connected to the PLC controller 9 respectively, the instrument air source 1 is connected to the filter pressure reducing valve 2, the filter pressure reducing valve 2 is connected to the first, two-position, three-way solenoid valve 3, the first, two-position, three-way solenoid valve 3 is connected to the pneumatic position retention valve 4, the pneumatic position retention valve 4 is connected to the second, two-position, three-way solenoid valve 5, the second, two-position, three-way solenoid valve 5 is connected to the quick exhaust valve 6, the quick exhaust valve 6 is connected to the cylinder 7, the cylinder 7 is connected to the pneumatic quick-closing valve 8, and the air source pressure sensors 10 are respectively correspondingly arranged on the air source main line.

[0019] For example, the air source pressure sensor 10 can detect the pressure loss of the instrument air source 1, and the PLC controller 9 receives the air source pressure loss signal and sends an alarm to the sound and light prompter 11; when the pneumatic quick-closing valve 8 is in the open position and the pressure of the instrument air source 1 drops abnormally, the pneumatic holding valve 4 automatically closes, and the air pressure in the air source pipeline behind the pneumatic holding valve 4 is not affected by the pressure drop of the external air circuit, and still maintains a certain air source pressure, and the pneumatic quick-closing valve 8 remains in the open position; the pneumatic holding valve 4 remains in the closed position. When the system needs to close the pneumatic quick-closing valve 8, the PLC controller 9 sends a closing electrical signal. At this time, the first two-position three-way solenoid valve 3 and the second two-position three-way solenoid valve 5 receive the closing signal at the same time, and the second two-position three-way solenoid valve 5 switches to the exhaust position, the air pressure in front of the quick exhaust valve 6 is released and switched to the exhaust position, the air source in the cylinder 7 is quickly depressurized, and the pneumatic quick-closing valve 8 is closed under control.

[0020] This embodiment includes a prompt component, which includes an audible and visual prompter 11 . The audible and visual prompter 11 is provided on the console and is electrically connected to the PLC controller 9 .

[0021] For example, when the instrument gas source 1 loses pressure, the PLC controller 9 may send a signal instruction to the sound and light prompter 11, and the sound and light prompter 11 performs sound and light warnings, so that the staff can conduct further inspections and take corresponding remedial measures.

[0022] This embodiment includes a display component, which includes a display screen 12 . The display screen 12 is provided on the console and is electrically connected to the main PLC controller 9 .

[0023] For example, when the instrument air source 1 loses pressure, it can be displayed on the display screen 12 .

[0024] This embodiment includes a power supply assembly, which includes a battery 13 . The battery 13 is provided on the console and electrically connected to the PLC controller 9 .

[0025] For example, in order to maintain continuous monitoring power, the battery 13 may be used to provide power.

[0026] In the above embodiment, the gas source pressure sensor 10, the sound and light indicator 11, the display screen 12, the battery 13 and the PLC controller 9 can all adopt existing models known to those skilled in the art.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pneumatic quick-closing valve air source pressure loss retaining device, characterized in that: The device includes a control mechanism, a detection mechanism and a position-holding mechanism. The control mechanism includes a console and a PLC controller. The detection mechanism includes an air source pressure sensor electrically connected to the PLC controller. The position-holding mechanism includes an instrument air source, a filter pressure reducing valve, a pneumatic position-holding valve, a quick exhaust valve, a cylinder, a pneumatic quick-closing valve, and a first, second, third, and fourth solenoid valve electrically connected to the PLC controller respectively. The instrument air source is connected to the filter pressure reducing valve, the filter pressure reducing valve is connected to the first, second, third, and fourth solenoid valve, the first, second, third, and fourth solenoid valve is connected to the pneumatic position-holding valve, the pneumatic position-holding valve is connected to the second, second, third, and fourth solenoid valve, the quick exhaust valve is connected to the cylinder, and the cylinder is connected to the pneumatic quick-closing valve. The air source pressure sensors are respectively arranged on the air source main line.

2. The pneumatic quick-closing valve air source pressure loss retaining device according to claim 1, characterized in that: The system comprises a prompt component, wherein the prompt component comprises an audible and visual prompter, and the audible and visual prompter is arranged on a console and electrically connected to a PLC controller.

3. The pneumatic quick-closing valve air source pressure loss retaining device according to claim 1, characterized in that: The system comprises a display assembly, wherein the display assembly comprises a display screen, and the display screen is arranged on the console and electrically connected to the PLC controller.

4. The pneumatic quick-closing valve air source pressure loss retaining device according to claim 1, characterized in that: The utility model comprises a power supply component, wherein the power supply component comprises a battery, and the battery is arranged on the console and electrically connected to the PLC controller.

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