Positive pressure breathing apparatus is a self-contained open air breathing apparatus, widely used in fire, chemical, shipbuilding, petroleum, smelting, storage, laboratories, mines and other departments, for firefighters or rescue personnel in smoke, gas, Safe and effective fire extinguishing, emergency rescue and rescue work under various conditions such as steam or oxygen deficiency. Positive pressure breathing apparatus is equipped with a full-face mask with a wide field of view, bright and airtightness. The gas supply device is equipped with a new type of gas supply valve with a small volume, light weight, and stable performance; a high-strength back sheet and a high safety factor are selected. High-quality high-pressure cylinders; Relief valve devices equipped with residual gas alarms, within the specified cylinder pressure range, can send a sound signal to the wearer, reminding the use of personnel to evacuate the site. Positive pressure breathing apparatus is very popular now!
Positive Pressure Respirator Structure General Model
RHZK6/30 has the following meanings: R is the firefighter's personal equipment code, H is the product category code (H is the respirator), ZK is the characteristic code (Z is positive pressure, K is air), 6 is the cylinder volume parameter, 30 The cylinder nominal working pressure parameter (MPa).
I. Gas cylinders and bottle valves
The cylinder material is a carbon fiber composite material with a rated storage pressure of 30 MPa and a volume of 6.8L. The cylinder valve is equipped with an overpressure protection membrane. When the pressure in the air cylinder exceeds 1.5 times of the rated storage pressure, the protection membrane is automatically depressurized; the cylinder valve is also provided with an after-opening device to make the cylinder It will not be turned off unintentionally after it is turned on. note:
1. No other kind of gas may be filled in the marked high-pressure air bottle. Otherwise, an explosion may occur.
2. Avoid exposing high pressure air bottles to high temperatures, especially under direct sunlight.
3. Do not contaminate any grease.
4. Each high-pressure air cylinder is accompanied by a high-pressure air bottle certificate, which must be properly kept and must not be lost.
5. The high-pressure air bottle and bottle valve must be rechecked every three years. The re-inspection can be entrusted to the manufacturer.
6. Do not change the color of the cylinder surface.
7, to avoid gas cylinder collision.
8. It is forbidden to mix and overpack compressed air.
9. If there is no inflatable equipment, it can be inflated at a nationally recognized inflation station.
The pressure reducer assembly is mounted on the back plate, and the main function of the pressure reducer connected to the valve through a high pressure pipe is to depressurize the high pressure air in the air bottle to a low and stable medium pressure, which is used for the supply valve. The pressure reducer belongs to a counterflow type pressure reducer, and the performance characteristic of the pressure reducer is that the pressure of the chamber slightly increases with the decrease of the working pressure of the cylinder, so that the automatic supply flow is not lower than that of the automatic lung throughout the use process. Starting traffic.
Note: The regulator has been commissioned at the factory. Untrained personnel cannot disassemble it.
Second, the alarm whistle
The role of the alarm whistle is to prevent the wearer from forgetting to observe the pressure indicated by the pressure gauge, and the occurrence of low cylinder pressure does not guarantee the safety of exiting the disaster area. The initial alarm pressure of the alarm whistle is 4 MPa to 6 MPa. When the cylinder pressure is alarm pressure, the alarm whistle will issue a whistle alarm. (But when the bottle valve was opened immediately after wearing, the pressure input to the alarm whistle gradually increased from low to high, and when the alarm pressure zone was passed, a brief alarm was also issued to prove the presence of high-pressure air in the cylinder. Instead of the alarm). Alarm whistle after 4MPa ~ 6MPa alarm, according to the average person walking speed of 4.5km / n work to calculate, to the air consumption to 2MPa so far, can wear about 9min ~ 10min, walking distance of about 350m, but because the wearer breathing different; The amount of work done is different. The distance to exit from the disaster area is different. The wearer should determine the necessary cylinder pressure required for exiting the disaster area (shown by a pressure gauge) according to different conditions. It must not be understood as a mechanical alarm before it begins to evacuate the disaster area. Moreover, during the wearing process, the pressure gauge must be constantly observed to prevent the alarm whistle from malfunctioning, and the possibility of being unable to safely exit the disaster area due to the low pressure.
Note: The alarm whistle has been adjusted and fixed at the factory. There is no testing equipment and it cannot be adjusted without authorization.
Third, the gas valve
The main function of the air supply valve is to decompress the medium-pressure air into low-pressure air at a certain flow rate to provide the user with the air needed for breathing. The air supply valve can automatically adjust the opening amount of the valve according to the size of the wearer's breathing and ensure that the pressure in the mask is in a positive pressure state for a long time. The gas supply valve is provided with a gas-saving device: it can prevent excessive loss of gas source before the system is connected (the cylinder valve is opened) and the mask is worn.
Fourth, mask
The mask is a complete structure and the rubber material of the mask is made of a mixture of natural rubber and silicone rubber. The inner cover in the mask prevents the lens from condensing and ensures a clear vision. The mask is equipped with a microphone and a breathing valve. The mask is connected to the air supply valve via a quick connector. Face masks are divided into two types, import and domestic, and users can configure them according to their needs.
Fifth, pressure gauge
The pressure gauge is used to show the pressure inside the bottle.
Positive pressure breathing apparatus features
1. The gas supply valve has large gas flow, stable performance, and low exhalation resistance, making it easy for wearers to breathe easily in any environment.
2. The mask has a wide field of vision and is transparent and clear: the gel is soft and the sealing effect is good.
3. The connection between the mask and the air supply valve adopts the socket type, which makes the loading and unloading fast and the operation is very simple.
4. There is a sound-transmitting diaphragm on the mask to make the wearer clear communication.
5, all connections are used to quickly plug, the operation is very simple and fast.
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