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Overpressure and undervoltage cut-off type fuel gas fire preventing and pressure regulating protection device

A protection device and fire protection technology, applied in the direction of valve device, gas/liquid distribution and storage, function valve type, etc., can solve problems such as failure of gas pressure regulating device, less research, failure of pressure regulating safety equipment, etc., to improve reliability , The effect of reliability improvement

Pending Publication Date: 2017-10-10
SHANGHAI FIORENTINI GAS EQUIP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a sudden fire accident occurs in the surrounding environment, it may lead to the failure of the gas pressure regulating device, which is mainly manifested in the failure of pressure regulation and safety equipment. At present, there is little research on various gas pressure regulating facilities in the fire environment to avoid fires. Relevant technical measures taken for gas supply accidents

Method used

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  • Overpressure and undervoltage cut-off type fuel gas fire preventing and pressure regulating protection device
  • Overpressure and undervoltage cut-off type fuel gas fire preventing and pressure regulating protection device
  • Overpressure and undervoltage cut-off type fuel gas fire preventing and pressure regulating protection device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] see figure 1 and Figure 4 , an over- and under-pressure cut-off gas fire protection device, including a pressure regulator 3, a cut-off valve 3.1, and a locking mechanism L; the diaphragm and push rod D in the pressure control head B of the cut-off valve 3.1 Connected, the lower part of the push rod D is connected with the guide cylinder, the push rod D and the guide cylinder are arranged in the closed casing, and the lower part of the closed casing is provided with a structure for accommodating and limiting the first spring E. A spring E is fixedly connected with the guide cylinder; a second spring F is arranged inside the guide cylinder, the upper end of the second spring F is connected with the push rod D, and the lower end is connected with the bottom of the guide cylinder; It can be driven to open the locking mechanism L, so that the shut-off valve 3.1 performs a shut-off action.

[0028] see figure 1 , The front end and rear end of the over- and under-pressure...

Embodiment 2

[0036] On the basis of embodiment one, see Figure 4 , the melting point of the material of the diaphragm in the pressure control head B is much higher than the melting point of the diaphragm in the pressure regulator 3 . Since the melting point of the metal diaphragm is obviously higher than that of the rubber diaphragm, the diaphragm of the pressure regulator must be damaged before the diaphragm of the emergency shut-off valve in a fire state. After the pressure is set, the emergency cut-off valve can be cut off by overpressure.

[0037] When implementing it:

[0038] If the diaphragm of the emergency shut-off valve with overpressure function is replaced with a metal diaphragm Figure 4 Installed on the test device as shown, and set the pressure regulator to 2kPa and the emergency shut-off valve to 4kPa (overpressure).

[0039] Step A: Ventilate 0.1MPa to the test device from the cut-off valve at the inlet 1, open the test valve 5, spray fire on the diaphragm chamber of t...

Embodiment 3

[0043] Embodiment three: see figure 2, on the basis of Embodiment 1 or 2, a fusible valve 3.2 is also provided on the pressure introduction pipe behind the cut-off valve 3.1, the A end of the fusible valve 3.2 is connected to the main gas circuit, and the B end is connected to the cut-off The valve 3.1 is connected, and the C end is connected with the external air. When a fire occurs or the temperature rises sharply, the metal substance in the fusible valve will melt, and the BC port of the fusible valve will be connected, and the gas will be discharged from the valve diaphragm chamber to the fusible valve. , the cut-off valve is cut off due to underpressure.

[0044] When implementing it:

[0045] Put the fusible valve in the high and low temperature box, and its three ports (A, B and C) are respectively connected to figure 2 On the test device shown, set the pressure regulator to 2kPa, the emergency shut-off valve to 4kPa (overpressure) and 1.1kPa (underpressure), and th...

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PUM

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Abstract

The invention relates to an overpressure and undervoltage cut-off type fuel gas fire preventing and pressure regulating protection device. The device comprises a pressure regulator, a cut-off valve and a lock catch mechanism; a diaphragm in a pressure control part of the cut-off valve is connected with a push rod, the lower portion of the push rod is connected with a guide barrel, the push rod and the guide barrel are arranged in a closed shell, a structure for containing and limiting a first spring is arranged at the lower portion of the closed shell, and the first spring is fixedly connected with the guide barrel; a second spring is arranged inside the guide barrel, the upper end of the second spring is connected with the push rod, and the lower end of the second spring is connected with the bottom of the guide barrel; and the push rod is upwards or downwards pushed to drive the lock catch mechanism to be opened, and therefore the cut-off valve implements cut-off motion. Besides the conventional first spring F, the second spring E is arranged inside the cut-off valve, and therefore the cut-off valve 3.1 can be subject to overpressure cutoff and undervoltage cutoff, the two cutoff functions do not influence each other, the reliability of the cut-off valve is improved, and the device can respond to abnormal states like fires.

Description

technical field [0001] The invention relates to an over-voltage and under-voltage cut-off type gas fire prevention and pressure regulation protection device, which belongs to the technical field of gas fire protection. Background technique [0002] In the application of urban gas, the pressure regulating cabinet and the pressure regulating box are widely used. The pressure regulating cabinet is generally installed on the roadside or in public places near the urban community, and the pressure regulating box is generally installed on the outer wall of the building in the urban community. If a sudden fire accident occurs in the surrounding environment, it may lead to the failure of the gas pressure regulating device, which is mainly manifested in the failure of pressure regulation and safety equipment. At present, there is little research on various gas pressure regulating facilities in the fire environment to avoid fires. Relevant technical measures taken for gas supply accide...

Claims

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Application Information

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IPC IPC(8): F17D3/01F17D5/00F16K17/38
CPCF16K17/383F17D3/01F17D5/00
Inventor 陆鸣伟应援农王传惠陶春辉朱绍光孙全王珂
Owner SHANGHAI FIORENTINI GAS EQUIP