CN211924540U - Prevent to spray too high fan protection of atmospheric pressure and spout nitrogen system - Google Patents
Prevent to spray too high fan protection of atmospheric pressure and spout nitrogen system Download PDFInfo
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- CN211924540U CN211924540U CN201922237124.2U CN201922237124U CN211924540U CN 211924540 U CN211924540 U CN 211924540U CN 201922237124 U CN201922237124 U CN 201922237124U CN 211924540 U CN211924540 U CN 211924540U
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Abstract
The utility model discloses a fan protection nitrogen spraying system for preventing over-high injection pressure, which comprises an oxygen compressor and a pneumatic regulating valve connected with the oxygen compressor and controlling the nitrogen spraying of the oxygen compressor, wherein the pneumatic regulating valve is connected with an air source; and a pressure stabilizing protection device is arranged between the pneumatic regulating valve and the air source. The fan protection nitrogen spraying system with the structure is provided with the pressure stabilizing protection device in front of the nitrogen spraying valve, so that the pressure of a gas source of the nitrogen spraying valve is ensured, and the damage to a compressor caused by overlarge pressure is avoided. Further protection is provided in the event of a DCS failure.
Description
Technical Field
The utility model relates to a fan protection spouts nitrogen system with protection device.
Background
An oxygen turbine compressor is required by an oxygen generation system of a steel making company, the compressor adopts 5-stage compression, and the designed outlet pressure is 3.3 MPa. Oxygen belongs to flammable and explosive gas, and nitrogen is sprayed into the compressor for protection when emergency stop occurs. The on-site nitrogen spraying valve is a pneumatic regulating valve, under emergency, the control system DCS automatically controls nitrogen spraying, and the nitrogen spraying valve is automatically closed after nitrogen spraying for 60S, so that the compressor is protected. If the control system DCS loses power, the nitrogen injection valve cannot be automatically closed after being opened, so that the internal pressure of the compressor is suppressed (the nitrogen injection source is 2MPa), and the design of the first section and the second section of the exhaust pipeline of the compressor can only bear the pressure of 1MPa, so that pipe explosion is easily caused.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a prevent to spray too high fan protection of atmospheric pressure and spout nitrogen system can guarantee that the air supply pressure who spouts the nitrogen valve is less than the pressure that the compressor can bear, guarantees compressor safety.
In order to solve the technical problem, the technical scheme of the utility model is to adopt a fan protection nitrogen spraying system for preventing the over-high injection air pressure, which comprises an oxygen compressor and a pneumatic regulating valve connected with the oxygen compressor and controlling the nitrogen spraying of the oxygen compressor, wherein the pneumatic regulating valve is connected with an air source; a pressure stabilizing protection device is arranged between the pneumatic regulating valve and the air source; the voltage stabilization protection device comprises a shell, wherein an air inlet channel and an air outlet channel are respectively arranged at two ends of the shell; the driving rod is vertically arranged in the shell and can move up and down; the lower end of the driving rod is connected with a valve core, and the driving rod moves up and down to drive the valve core to block or open a passage between the air inlet channel and the air outlet channel; the upper end of the driving rod is provided with a piston which is positioned in the cylinder body; an air return pipeline communicated with the cylinder body is arranged on the air outlet channel; the driving rod penetrates through the supporting plate; a pre-tightening spring is arranged between the supporting plate and the piston. The principle of the utility model lies in: the pressure P1 of the air source is changed into P2 after the valve core is throttled. P2 enters the cylinder through the muffler and acts on the piston, the generated acting force is balanced with the acting force of the pre-tightening spring, and the relative position of the valve core is determined for controlling the size of P2. When P2 is increased, the force of P2 on the piston is increased, and when the force exceeds the pre-tightening force of the spring, the valve core is moved towards the closing direction until the force of the piston is balanced with the pre-tightening force of the spring. Therefore, the air pressure after the pressure stabilizing protection device can be ensured not to exceed a certain preset value. The preset value is determined by the pretightening force of the spring, the larger the pretightening force is, P2 is, and conversely, the smaller the pretightening force is, P2 is, the smaller the pretightening force is.
As an improvement, the air inlet channel extends to the lower part of the air outlet channel and is communicated by a vertical shaft; the valve core can close the vertical shaft.
As a further improvement, a valve seat matched and sealed with the valve core is arranged in the vertical shaft. The valve seat and the valve core are matched to improve the air tightness.
As another further improvement, the air return pipeline is connected to the top of the cylinder body. Facilitating the air flow to push the piston.
As a modification, the piston top is provided with a diaphragm. The air tightness between the piston and the cylinder body is increased.
As a modification, the position of the support plate can be adjusted up and down. The pretightening force of the spring is adjusted by adjusting the position of the supporting plate.
The utility model discloses an useful part lies in: the fan protection nitrogen spraying system with the structure is provided with the pressure stabilizing protection device in front of the nitrogen spraying valve, so that the pressure of a gas source of the nitrogen spraying valve is ensured, and the damage to a compressor caused by overlarge pressure is avoided. Further protection is provided in the event of a DCS failure.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Fig. 2 is a structural diagram of the voltage stabilization protection device.
The labels in the figure are: the device comprises an air source 1, a pressure stabilizing protection device 2, a pneumatic regulating valve 3, an oxygen compressor 4, a shell 21, a driving rod 22, a valve core 23, an air inlet channel 24, an air outlet channel 25, a piston 26, a supporting plate 27, a pre-tightening spring 28, a valve seat 29, an air return pipeline 30 and a diaphragm 31.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the specific embodiments.
As shown in fig. 1 and fig. 2, the present invention comprises an oxygen compressor 4 and a pneumatic regulating valve 3 connected with the oxygen compressor 4 for controlling nitrogen spraying, wherein the pneumatic regulating valve 3 is connected with an air source 1; a pressure stabilizing protection device 2 is arranged between the pneumatic regulating valve 3 and the air source 1; the voltage stabilization protection device 2 comprises a shell 21, wherein an air inlet channel 24 and an air outlet channel 25 are respectively arranged at two ends of the shell 21; the device also comprises a driving rod 22 vertically arranged in the shell 21, and the driving rod 22 can move up and down; the lower end of the driving rod 22 is connected with a valve core 23, and the driving rod 22 moves up and down to drive the valve core 23 to block or open a passage between the air inlet channel 24 and the air outlet channel 25; the upper end of the driving rod 22 is provided with a piston 26, and the piston 26 is positioned in the cylinder body; the piston 26 is provided with a diaphragm 31 on top. An air return pipeline 30 communicated with the cylinder body is arranged on the air outlet channel 25; the return air duct 30 is connected to the top of the cylinder. A support plate 27 arranged transversely is also included, and the driving rod 22 penetrates through the support plate 27; the position of the support plate 27 is adjustable up and down. A pre-tightening spring 28 is arranged between the supporting plate 27 and the piston 26.
The air inlet channel 24 extends to the lower part of the air outlet channel 25 and is communicated by a vertical shaft; the spool 23 may close the shaft. A valve seat 29 is mounted in the shaft to co-operate with the poppet 23 for sealing.
When the emergency stop is carried out, the DCS controls the pneumatic regulating valve 3 to spray nitrogen to the oxygen compressor 4, and the pressure stabilizing protection device 2 ensures that the air inlet pressure of the pneumatic regulating valve 3 is smaller than the pressure which can be borne by the pipeline of the oxygen compressor 4. In the application, because the design of the first and second exhaust pipelines of the oxygen compressor 4 can only bear the pressure of 1MPa, the pretightening force of the pretightening spring 28 is adjusted by adjusting the position of the supporting plate 27, so that the pressure of the air flow passing through the pressure stabilizing protection device 2 is 0.8 MPa.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.
Claims (6)
1. A fan protection nitrogen spraying system for preventing over-high spraying air pressure comprises an oxygen compressor and a pneumatic regulating valve which is connected with the oxygen compressor and is controlled to spray nitrogen for the oxygen compressor, wherein the pneumatic regulating valve is connected with an air source; the method is characterized in that: a pressure stabilizing protection device is arranged between the pneumatic regulating valve and the air source; the voltage stabilization protection device comprises a shell, wherein an air inlet channel and an air outlet channel are respectively arranged at two ends of the shell; the driving rod is vertically arranged in the shell and can move up and down; the lower end of the driving rod is connected with a valve core, and the driving rod moves up and down to drive the valve core to block or open a passage between the air inlet channel and the air outlet channel; the upper end of the driving rod is provided with a piston which is positioned in the cylinder body; an air return pipeline communicated with the cylinder body is arranged on the air outlet channel; the driving rod penetrates through the supporting plate; a pre-tightening spring is arranged between the supporting plate and the piston.
2. The blower protection nitrogen injection system for preventing over-high injection air pressure as claimed in claim 1, wherein: the air inlet channel extends to the lower part of the air outlet channel and is communicated by a vertical shaft; the valve core can close the vertical shaft.
3. The blower protection nitrogen injection system for preventing over-high injection air pressure as claimed in claim 2, wherein: and a valve seat matched and sealed with the valve core is arranged in the vertical shaft.
4. The blower protection nitrogen injection system for preventing over-high injection air pressure as claimed in claim 1, wherein: the air return pipeline is connected to the top of the cylinder body.
5. The blower protection nitrogen injection system for preventing over-high injection air pressure as claimed in claim 1, wherein: and the top of the piston is provided with a diaphragm.
6. The blower protection nitrogen injection system for preventing over-high injection air pressure as claimed in claim 1, wherein: the position of the supporting plate can be adjusted up and down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922237124.2U CN211924540U (en) | 2019-12-13 | 2019-12-13 | Prevent to spray too high fan protection of atmospheric pressure and spout nitrogen system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922237124.2U CN211924540U (en) | 2019-12-13 | 2019-12-13 | Prevent to spray too high fan protection of atmospheric pressure and spout nitrogen system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211924540U true CN211924540U (en) | 2020-11-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922237124.2U Active CN211924540U (en) | 2019-12-13 | 2019-12-13 | Prevent to spray too high fan protection of atmospheric pressure and spout nitrogen system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211924540U (en) |
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2019
- 2019-12-13 CN CN201922237124.2U patent/CN211924540U/en active Active
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