Suspended heptafluoropropane fire extinguishing device is one of the most compact and easy-to-install forms in gas fire extinguishing systems. Different from pipe network and cabinet devices, the hanging device integrates fire extinguishing agent storage bottles, container valves, nozzles and other components into one, and directly hangs under the ceiling of the protective area without special cylinder rooms or laying pipe networks. This design makes it especially suitable for small distribution rooms, cable interlayer, small equipment rooms, unattended substations, field base stations and other places with narrow space or difficult transformation. This article will take the suspended heptafluoropropane fire extinguishing device produced by Guangdong Dingya Fire Equipment Co., Ltd. as an example to analyze in detail its complete workflow from fire detection to fire extinguishing.

I. Overview of System Composition

The suspended heptafluoropropane fire extinguishing device of Guangdong Dingya Fire Equipment Co., Ltd. is mainly composed of the following parts:

Fire extinguishing agent storage bottle: Made of high-quality steel, heptafluoropropane fire extinguishing agent is stored inside, and it is filled with driving nitrogen. The surface of the bottle body is treated by anti-corrosion spraying, and the corrosion resistance is strong. The storage bottle specifications are available in various capacities such as 10L, 20L, and 30L, and can be flexibly configured according to the area of the protection area.

Container valve: Installed at the outlet of the storage bottle, it is the key component to control the release of fire extinguishing agent. The container valve is integrated with electromagnetic starter, mechanical emergency startup device, pressure gauge and safety pressure relief device.

Hanging bracket: Made of high-strength steel, the whole device is firmly fixed on the ceiling or wall of the protective area.

Nozzle: Located at the bottom of the storage bottle, it adopts a special flow channel design to ensure that the fire extinguishing agent diffuses evenly when sprayed, and quickly covers the entire protective area.

Fire detection and control system: including smoke detectors, temperature detectors, fire controllers, acousto-optic devices, etc. For the temperature-controlled suspension device, it is also equipped with a temperature-sensitive glass ball or a fusible alloy element, which can realize self-start without electricity.

2. Overview of the working principle of the system

The working principle of the suspended heptafluoropropane fire extinguishing device can be summarized as follows: when a fire breaks out in the protective area, the fire detector transmits the signal to the controller, and the controller issues a linkage command after confirming the fire, turns off the ventilation equipment and cuts off the non-fire power supply. After the set delay time, the controller sends a start signal to the electromagnetic starter, and the electromagnetic starter acts to open the container valve, and the fire extinguishing agent is sprayed to the protection area through the nozzle under the action of the driving nitrogen pressure to achieve full submergence and fire extinguishing. For temperature-controlled devices, when the temperature reaches the set value (usually 68 °C or 93 °C), the temperature sensing element will automatically break, the container valve will open, and the fire extinguishing agent will be sprayed by itself without any electrical signal.

3. Detailed explanation of the two startups

The suspended heptafluoropropane fire extinguishing device of Guangdong Dingya Fire Equipment Co., Ltd. provides two starts to meet the needs of different application scenarios.

Electronically controlled start-up is suitable for places where people are on duty or need linkage control. After the device is connected with the fire controller, the system is in an automatic monitoring state. When the smoke detector and the temperature detector in the protection area send out fire signals at the same time, the controller confirms that the fire has occurred, emits sound and light and starts the linkage equipment. After a 30-second delay, it outputs a DC24V start-up voltage to the electromagnetic starter. The electromagnetic starter acts, punctures the sealing diaphragm of the container valve, and sprays the fire extinguishing agent. Electronically controlled start-up can also be realized manually through the manual control box outside the protection area.

Temperature-controlled start-up is suitable for unattended or remote places, such as field base stations, small substations, etc. The device adopts temperature-sensitive glass balls or fusible alloy elements as temperature-sensitive elements. When the temperature of the protective area rises to the operating temperature of the temperature-sensing element (usually 68 °C) due to fire, the liquid or alloy in the temperature-sensing element melts, causing the element to rupture. After the container valve loses its restraint, it will automatically open, and the fire extinguishing agent will be sprayed immediately. Temperature-controlled start does not require any power supply and control system, realizing pure mechanical automatic fire extinguishing, with high reliability.

In addition, the suspension device of Guangdong Dingya Fire Protection is also equipped with a mechanical emergency start function. In extreme cases where the electronic control system fails and the temperature control component does not act, the operator can manually pull the emergency start pull ring on the container valve to directly open the valve to release the fire extinguishing agent.

4. Detailed explanation of the complete fire extinguishing process

The following takes the electronically controlled suspended heptafluoropropane fire extinguishing device as an example to explain the fire extinguishing process in detail.

When a fire occurs in the protected area, the smoke detector first senses the smoke particles and transmits the signal to the fire controller. At this time, the controller sends out an early warning signal, and the sound and light device in the protection area starts to remind personnel to pay attention. But at this time, the fire extinguishing program has not yet started, and the system is on alert.

When the temperature detectors in the same protection area also sense the abnormal temperature and send out fire signals, the two independent detectors confirm the existence of fire at the same time. The controller confirms the fire occurrence according to the preset logic, and immediately enters the fire extinguishing program.

The controller first sends a linkage command, and executes the following operations through the control module: close the ventilation equipment in the protection area to prevent the loss of fire extinguishing agent; Cut off the non-fire power supply that has nothing to do with fire fighting to avoid secondary harm caused by electrical equipment in the process of fire fighting. The purpose of this series of actions is to ensure that the protective area has the conditions for full submergence and fire extinguishing.

At the same time, the controller enters a 30-second delay phase. During the delay time, the acousto-optic device sounded, prompting the personnel in the protection area to evacuate quickly. According to GB50370 "Code for Design of Gas Fire Extinguishing Systems", the delay time can be adjusted between 0 and 30 seconds according to the actual situation of the protection area. Suspended devices are usually used in small protective areas, and the evacuation time of personnel is relatively short, and can be set to 0 delay or short delay.

After the delay ends, the controller sends a DC24V start signal to the electromagnetic starter on the suspension device. The electromagnetic starter acts to break the sealing diaphragm of the container valve. The storage bottle is filled with driving nitrogen (pressure is usually 1.6 MPa or 2.5 MPa). Under the action of pressure, the liquid heptafluoropropane fire extinguishing agent enters the nozzle through the container valve. The special flow channel design of the nozzle makes the fire extinguishing agent spray evenly in a mist shape and quickly spread to the entire protection area. The entire spraying process is completed within 10 seconds, and the concentration of the fire extinguishing agent quickly reaches the designed fire extinguishing concentration (usually 7% to 10%), realizing full submergence and fire extinguishing.

When the fire extinguishing agent is sprayed, the pressure signal feedback device installed on the container valve (if selected) acts to transmit the spraying signal to the fire extinguishing controller, and the controller immediately lights the "deflation indicator light" outside the protection area to remind personnel that the fire extinguishing agent has been released in the protection area and entry is prohibited.

For the temperature-controlled hanging device, the fire extinguishing process is more concise: when the temperature of the protective area reaches the operating temperature of the temperature-sensitive glass ball, the glass ball breaks, the container valve opens automatically after losing its support, and the fire extinguishing agent is sprayed. The whole process does not need any electrical signal, and realizes pure mechanical automatic fire extinguishing.

5. Core Features and Advantages of Suspension Systems

The suspended heptafluoropropane fire extinguishing device of Guangdong Dingya Fire Equipment Co., Ltd. has the following notable features:

Minimum occupancy: The device is suspended below the ceiling and does not occupy the ground area. It is especially suitable for places with narrow space and dense equipment. The capacity of the storage bottle ranges from 10L to 30L, the overall height is controlled between 400mm and 600mm, and the net height of the protection area is low.

The installation is extremely simple: no need to lay a pipe network, no need to set up a special cylinder room, only need to install a hanging bracket on the ceiling to complete the fixation. For renovation projects, there is no need to demolish walls or floors, the construction period is short, and the impact on normal operation is minimal.

Optional temperature control start: For unattended places, temperature control devices can be selected without fire controllers and power supplies, which fundamentally eliminates the risk of false start or non-start caused by electrical failures, and has high reliability.

Cost-effective and efficient: Compared with pipe network and cabinet systems, the hanging device saves links such as pipe network, cylinder room, and complex control systems, and the initial investment is significant. It is especially suitable for decentralized protection with a small protection area and a large number. zone.

Easy maintenance: The structure of the device is simple, and daily maintenance only needs to check whether the pressure gauge indication is within the normal range (green field) and whether the nozzle is unblocked. Full testing and reagent filling are sufficient every five years.

6. Product advantages of Guangdong Dingya Fire Equipment Co., Ltd.

Guangdong Dingya Fire Equipment Co., Ltd., headquartered in Nansha District, Guangzhou, is a comprehensive enterprise integrating fire equipment production, sales, research and development, construction, maintenance and training. The suspended heptafluoropropane fire extinguishing device produced by the company has the following core advantages:

Complete qualifications: The products have passed the inspection of the National Fixed Fire Extinguishing System and Refractory Components Supervision and Inspection Center, complied with national standards such as GB50370 and GB25972-2024, and obtained ISO9001, ISO14001 and CE certification.

Rich specifications: Provide 10L, 20L, 30L and other specifications of electronic control and temperature control suspension devices, which can meet the needs of different sizes of protection areas. For special projects, non-calibration services can also be provided.

Mature technology: The company has 20 senior engineers and 13 R&D and design personnel, and has accumulated rich technology in the field of heptafluoropropane fire extinguishing. All products have passed strict air tightness test, strength test and action test to ensure that 100% of the products are qualified.

Perfect service: From scheme design, equipment selection to installation and commissioning, after-sales maintenance, Dingya Fire provides one-stop service. The company can send professional and technical personnel to conduct on-site surveys and formulate the optimal configuration plan according to the actual conditions of the protection area.

Wide application: Dingya Fire's suspended heptafluoropropane fire extinguishing device has been successfully applied to communication base stations, small power distribution rooms, cable wells, charging pile equipment rooms, energy storage containers, field monitoring stations and many other places, and customers have unanimously praised it.

7. Key points of installation and maintenance

When installing a suspended heptafluoropropane fire extinguishing device, the following points should be noted: the device should be suspended in the center of the protection area or directly above the area where the fire is most likely to occur; The nozzle should not be obstructed by large equipment or obstacles; For temperature-controlled devices, avoid installing them at air-conditioning outlets or direct sunlight positions to prevent accidental start-up; When multiple devices are used at the same time, they should be evenly distributed to ensure that there is no dead angle for fire extinguishing agent coverage.

In terms of daily maintenance, check whether the pointer of the pressure gauge is in the green field (normal pressure range) once a month, and if the pointer drops to the red field, replenishment should be carried out in time; Check once a year whether the nozzle is unblocked and whether there are blockages; Every five years a comprehensive hydraulic test and reagent filling shall be carried out by a professional body. For electronically controlled devices, linkage tests should also be carried out regularly to ensure that the electromagnetic starter operates normally.

Conclusion

Suspended heptafluoropropane fire extinguishing device has become the choice of fire protection in small protection areas due to its advantages of compact structure, simple installation, economic cost, and reliable start-up. Its core operation logic can be summarized as: fire detection → delayed evacuation (electronic control type) → electromagnetic start or temperature control start → container valve opening → fire extinguishing agent spraying → full submersion and fire extinguishing. The temperature control device realizes pure mechanical automatic fire extinguishing without any power supply and control equipment, and has irreplaceable advantages in unattended places.