Instrument gas concentrated emission silencer of pneumatic valve

Abstract

The utility model discloses an instrument gas concentrated emission silencer of a pneumatic valve, which comprises a nitrogen spherical tank, the nitrogen spherical tank is communicated with a gas source main pipe, a gas supply main valve is arranged on the gas source main pipe, a plurality of gas inlet branch pipes are connected in parallel on the gas source main pipe, and the gas inlet branch pipes are respectively communicated with inlets of a pneumatic switch valve and a pneumatic control valve. Outlets of the pneumatic switch valve and the pneumatic control valve are respectively communicated with a gas collecting main pipe through exhaust branch pipes; and an emptying silencer is arranged on the gas collecting main pipe. The instrument gas source of the device meets the requirements of high pressure, cleanness, continuity and sufficiency, the instrument gas collecting and discharging device collects nitrogen for instruments in a centralized mode and guides and discharges the nitrogen to the outdoor atmosphere, the risk that the concentration of indoor nitrogen is too high is avoided, meanwhile, valve exhaust noise is lowered under the condition that valve action is not affected, and the device is safe and practical.

Description

Technical Field

[0001] The utility model relates to the field of pneumatic valves, in particular to an instrument air centralized discharge silencing device for pneumatic valves. Background Art

[0002] Pneumatic valves are valves driven by compressed gas and can be used to control the flow of various types of fluids, such as air, water, steam, various corrosive media, mud, oil, liquid metal, and radioactive media. The automatic valves of a certain pressure swing adsorption oxygen generator unit use pneumatic valves, which require a high-pressure, clean, continuous, and sufficient gas source to ensure that the valve can be opened and closed smoothly. Therefore, nitrogen in nitrogen cylinders is usually used as the source of instrument gas. However, during the operation of the pressure swing adsorption oxygen generator unit, the following problems exist: (1) The pneumatic valve switching time is ≤1s and the gas source pressure is required to be 0.7MPa. When switching, the cylinder pressure is discharged from 0.7MPa to 0, resulting in a large pressure drop in the valve and a high gas flow rate, resulting in a large exhaust noise from the valve; (2) The unit is installed indoors, and frequent exhaust will lead to excessively high nitrogen concentration in the room, posing a major safety hazard. Utility Model Content

[0003] The utility model relates to a centralized instrument gas exhaust silencing device for a pneumatic valve, aiming to solve the problems of high exhaust noise from the pneumatic valve and high indoor nitrogen concentration posing a major safety hazard.

[0004] To achieve its purpose, the utility model adopts the following technical solutions:

[0005] A device for centralized discharge and silencing of instrument gas for pneumatic valves comprises a nitrogen ball tank connected to a gas source main pipe, a gas supply main valve being provided on the gas source main pipe, a plurality of air intake branches being connected in parallel to the gas source main pipe, the air intake branches being respectively connected to the inlets of a pneumatic switch valve and a pneumatic regulating valve, the outlets of the pneumatic switch valve and the pneumatic regulating valve being respectively connected to the gas collecting main pipe via exhaust branch pipes, and a venting silencer being provided on the gas collecting main pipe.

[0006] Furthermore, the gas collecting main pipe includes an inlet section and an outlet section. The inlet section is horizontally arranged indoors, and the outlet section is led outdoors and then installed vertically upwards.

[0007] Furthermore, the inlet section and the outlet section of the gas collecting main pipe are connected through a concentric reducer.

[0008] Furthermore, the diameter of the inlet section of the gas collecting main pipe is smaller than the diameter of the outlet section, and the concentric reducer has a smaller diameter at one end close to the inlet section.

[0009] Furthermore, the vent silencer is arranged at the outlet section outside the gas collecting main pipe.

[0010] Furthermore, the height of the vent silencer from the ground is greater than 5m.

[0011] Furthermore, the number of the pneumatic switching valves is at least two, and all the pneumatic switching valves are driven by a two-position five-way solenoid valve as a reversing pneumatic actuator.

[0012] Furthermore, the number of the pneumatic regulating valves is at least two, and all the pneumatic regulating valves use cylinders as actuators.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] The utility model provides an instrument gas centralized discharge silencing device, and the instrument gas source meets the requirements of high pressure, cleanliness, continuity and sufficiency. The instrument gas collection and discharge device collects the nitrogen used for the instrument and guides it to be discharged into the outdoor atmosphere, avoiding the risk of excessive nitrogen concentration indoors. At the same time, it reduces the valve exhaust noise without affecting the valve action, which is safe and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of the instrument gas centralized discharge silencing device of the present utility model;

[0016] In the figure: 1-nitrogen ball tank; 2-gas supply main valve; 3-gas source main pipe; 4-exhaust branch pipe; 5-pneumatic switch valve; 6-inlet branch pipe; 7-gas collecting main pipe; 8-venting silencer; 9-inlet section; 10-outlet section; 11-concentric reducer; 12-pneumatic regulating valve. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings:

[0018] like Figure 1 As shown, the utility model is a centralized instrument gas discharge and silencing device for pneumatic valves, comprising a nitrogen gas cylinder 1, the nitrogen gas cylinder 1 being connected to a gas source main pipe 3, a gas supply main valve 2 being provided on the gas source main pipe 3, six air intake branches 6 being connected in parallel to the gas source main pipe 3, the air intake branches 6 being respectively connected to the inlets of three pneumatic switch valves 5 and three pneumatic regulating valves 12, the outlets of the pneumatic switch valves 5 and the pneumatic regulating valves 12 being respectively connected to a gas collecting main pipe 7 via exhaust branches 4. The gas collecting main pipe 7 comprises an inlet section 9 and an outlet section 10, the inlet section 9 being horizontally arranged indoors in the pressure swing adsorption oxygen generator unit, the outlet section 10 being led outdoors and then installed vertically upwards, the outlet section 10 of the gas collecting main pipe 7 being outdoor and provided with a venting silencer 8, the venting silencer 8 being 6m above the ground.

[0019] To further reduce gas emission noise, the inlet section 9 and outlet section 10 of the gas collecting manifold 7 are connected by a concentric reducer 11. The diameter of the inlet section 9 is smaller than that of the outlet section 10, and the concentric reducer 11 has a smaller diameter near the inlet section 9. Furthermore, all pneumatic on / off valves 5 use two-position, five-way solenoid valves as reversing actuators to automatically open and close the valves. All pneumatic regulating valves 12 use pneumatic cylinders as actuators, driven by accessories such as electrical positioners to adjust the valve opening and closing levels.

[0020] When the PSA oxygen generator is in operation, the instrument nitrogen supply main valve 2 is opened. The instrument nitrogen from the nitrogen ball tank 1 passes through the gas source main pipe 3 and is distributed to the various pneumatic switch valves 5 and pneumatic control valves 12 via the air intake branch pipe 6. After the pneumatic switch valves 5 and pneumatic control valves 12 are switched, the exhaust gas is discharged through the exhaust branch pipe 4 and collected in the gas collecting main pipe 7. It is then silenced by the vent silencer 8 on the outlet section 10 of the gas collecting main pipe 7 before being discharged outdoors. Because the inlet section 9 and outlet section 10 of the gas collecting main pipe 7 are connected by a concentric reducer 11, and the diameter of the outlet section 10 is larger than that of the inlet section 9, the noise of the exhaust gas passing through the outlet section 10 is further reduced.

Claims

1. A device for centrally discharging and silencing instrument gas for a pneumatic valve, comprising a nitrogen gas cylinder (1), wherein the nitrogen gas cylinder (1) is connected to a gas source main pipe (3), and a gas supply main valve (2) is provided on the gas source main pipe (3), and characterized in that: The gas source main pipe (3) is connected in parallel with a plurality of air intake branches (6), the air intake branches (6) are respectively connected to the inlets of the pneumatic switch valve (5) and the pneumatic regulating valve (12), and the outlets of the pneumatic switch valve (5) and the pneumatic regulating valve (12) are respectively connected to the gas collecting main pipe (7) through the exhaust branch pipe (4), and the gas collecting main pipe (7) is provided with a venting silencer (8).

2. The instrument air centralized exhaust silencing device for a pneumatic valve according to claim 1, characterized in that: The gas collecting main pipe (7) comprises an inlet section (9) and an outlet section (10), wherein the inlet section (9) is horizontally arranged indoors, and the outlet section (10) is led outdoors and then installed vertically upwards.

3. The instrument air centralized exhaust silencing device for a pneumatic valve according to claim 2, characterized in that: The inlet section (9) and the outlet section (10) of the gas collecting main pipe (7) are connected via a concentric reducing pipe (11).

4. The instrument air centralized exhaust silencing device for a pneumatic valve according to claim 3, characterized in that: The diameter of the inlet section (9) of the gas collecting main pipe (7) is smaller than the diameter of the outlet section (10), and the concentric reducer (11) has a smaller diameter at one end close to the inlet section (9).

5. The instrument air centralized exhaust silencing device for a pneumatic valve according to claim 4, characterized in that: The venting silencer (8) is arranged at the outdoor outlet section (10) of the gas collecting main pipe (7).

6. The instrument air centralized exhaust silencing device for a pneumatic valve according to claim 5, characterized in that: The height of the vent silencer (8) from the ground is greater than 5m.

7. The instrument air centralized exhaust silencing device for a pneumatic valve according to any one of claims 1 to 6, characterized in that: The number of the pneumatic switching valves (5) is at least two, and all the pneumatic switching valves (5) are driven by a two-position five-way solenoid valve as a reversing pneumatic actuator.

8. The instrument air centralized exhaust silencing device for a pneumatic valve according to any one of claims 1 to 6, characterized in that: The number of the pneumatic regulating valves (12) is at least two, and all the pneumatic regulating valves (12) use cylinders as actuators.

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