Constant pressure discharge system

[0022] Example

[0023] Reference figure 1 As shown, the present invention discloses a constant pressure discharge system, which includes a driving air port, a regulating valve two, a regulating valve two 3, a venturi 6, a discharge outlet and a pressure relief outlet.

[0024] The above-mentioned driving air port, regulating valve 2 3, venturi tube 6 and discharge outlet are connected in sequence. The driving air port is connected to a high-pressure driving air source. The second regulating valve 3 is connected to the discharge outlet signal for collecting the air pressure at the discharge outlet. The meter outlet is connected to the throat of the venturi 6. One end of the regulating valve 2 is connected between the driving air port and the regulating valve 2 3, and the other end is connected between the meter outlet and the throat pipe of the venturi 6. The regulating valve 2 is connected with the exit signal of the meter, and is used to collect the air pressure at the exit of the meter. The discharge outlet is connected to the flare or low pressure pipeline. With the above optimized structure, the driving gas provided by the driving air port can pass into the venturi 6 and generate a negative pressure at its throat, so that the gas at the outlet of the meter is sucked into the venturi 6, and along with the driving gas, the venturi 6 The air outlet is discharged; the regulating valve 2 can monitor the pressure at the outlet of the instrument and keep it at the same atmospheric pressure. When the pressure is lower than the atmospheric pressure, the regulating valve 2 will increase the air supplement. When the pressure is higher than the atmospheric pressure, the regulating valve 1. Reduce the amount of supplemental air, if other working pressures are needed, it can also be achieved; the regulating valve 2 3 can monitor the pressure at the discharge outlet and ensure the stability of the negative pressure in the Venturi tube 6, when the pressure increases, the regulating valve 2 3 increases The supply pressure, when the pressure decreases, the regulating valve 2 3 reduces the supply pressure.

[0025] As a further improvement of the present invention, the above-mentioned regulating valve 1-2 is a self-operated regulating valve. The actuator of the self-operated regulating valve is connected between the driving air port and the regulating valve two 3. The signal source pipe of the self-operated regulating valve is connected and arranged at the outlet of the meter. The self-operated regulating valve can automatically adjust the pressure and does not require external power, so that the flow distribution and dynamic balance of the system can be conveniently realized, which greatly simplifies the debugging of the system; at the same time, the system of pure mechanical components is more convenient to install and use.

[0026] As a further improvement of the present invention, the above-mentioned regulating valve 2-3 is a self-operated regulating valve. The actuator of the self-operated regulating valve is connected between the air inlet of the venturi tube 6 and the connecting node of the driving air port and the regulating valve-2. The signal source pipe of the self-operated regulating valve is connected and arranged at the discharge outlet.

[0027] As a further improvement of the present invention, a flowmeter 4 is provided in communication between the connection node of the above-mentioned regulating valve-2 and the meter outlet and the venturi tube 6. The flow meter 4 can limit the amount of air sucked into the venturi tube 6 by the negative pressure of the venturi tube 6.

[0028] As a further improvement of the present invention, the above-mentioned flow meter 4 is a rotameter. While restricting the flow, it has the effect of obstructing the flow of gas in the reverse direction, reducing the impact of the reverse gas flow at the Venturi tube 6 when abnormal.

[0029] As a further improvement of the present invention, a restrictive valve is provided at the air inlet of the above-mentioned flow meter 4. The restrictor valve can cut off the gas flowing into the flow meter 4, which is convenient for maintenance and replacement.

[0030] As a further improvement of the present invention, a check valve 5 is provided between the above-mentioned regulating valve 2 3 and the air inlet of the Venturi tube 6. The one-way valve 5 can prevent the reverse air flow at the venturi tube 4 from impacting the regulating valve 2 3 when abnormal.

[0031] As a further improvement of the present invention, a pressure relief valve 1 is provided in communication between the above-mentioned meter outlet and the signal collection point of the regulating valve-2. The other end of the pressure relief valve 1 is connected to the pressure relief outlet. When the outlet pressure of the instrument exceeds the set value of the pressure relief valve, the pressure relief valve 1 automatically opens, and the gas in the system can be discharged from the pressure relief outlet to ensure the safety of various components and systems.