1, fresh air system piping layout principles

Shorten pipes as much as possible, reduce branch pipes and avoid complicated local components, so as to save materials and reduce local wind resistance. Try to avoid installing pipes at right angles, and use Y-shaped oblique tee or two 45-degree elbows to connect pipe fittings.

2. How to arrange the fresh air system pipes?

There are many ways to arrange the pipes of fresh air system, and the traditional way of sending and returning has been eliminated with the passage of time.

At present, the main air supply modes can be divided into top air supply and ground air supply. Take five degrees and five constant ground air supply as an example. When working, the air outlet at the top of the room exhausts the dirty air in the room, and at the same time, the air outlet at the bottom of the room sends the filtered fresh air into the room. An organized airflow is formed to bring the dirty air in the work area to the upper part of the room and exhaust it from the air outlet at the top. In this way, fresh air is brought in from underground, and dirty air is discharged from above, so that the indoor human activity area can always breathe clean and fresh air.

The ground air supply needs to arrange fresh air ducts at the bottom of the room, which may occupy some low-rise houses with high floors and high internal floors, and is not suitable for ground air supply. Ground air supply will not occupy too many floors, but the effect will be worse than ground air supply.

3, fresh air system piping layout considerations

(1) pipeline layout

Need to consider the requirements of indoor fresh air volume and the owner's usage habits, design air volume and draw drawings. On the one hand, it is necessary to minimize the loss of air volume, on the other hand, it is necessary to meet the requirements of the owner for the height of the ceiling, and other concealed works in the ceiling should also be considered.

(2) pay attention to the hole through the wall

Whether the structural conditions of the location that needs to pass through the wall are met or allowed cannot be at the expense of destroying the overall structure of the room.

(3) Fresh air duct materials

Before decorating the ceiling, PVC pipes or galvanized air ducts are generally used for routine installation, which is characterized by long service life. The disadvantage is that dust and bacteria are easy to accumulate at pipeline joints and flanges, which is difficult to clean and easy to deteriorate indoor air quality.

It is suggested that the imported food-grade pipeline can be used when conditions permit, and the pipeline can be directly laid from the fan to the end of the tuyere without a joint in the middle, which can effectively avoid the above problems; If the ceiling has been basically installed, you can choose composite hose to supply air, which makes the construction easier and the arrangement of air ducts more flexible, but it has a great impact on the appearance.

(4) Consider the post-cleaning problem of fresh air duct.

We know that bacteria and dust will accumulate after the fresh air system is used for a period of time. If it is not cleaned regularly, it will cause secondary pollution to the house. Therefore, choosing a pipeline that is easy to clean at the beginning will bring great benefits to your later cleaning work.

Pipeline installation of fresh air system

1, pipe installation standard for fresh air system

(1) The pipeline direction, pipe diameter and air duct direction shall be implemented according to the requirements of design drawings.

(2) When cutting the pipeline, fine tooth saw or special pipe cutting tool should be selected. The cross section of the cross section should be straight and perpendicular to the pipe axis, and the burrs and burrs at the nozzle must be polished off.

(3) Before the pipe and pipe fittings are bonded, the bonding surface of socket shall be wiped clean and kept clean to ensure no dust and sundries; The inner diameter of the pipeline is clean and free of sundries. When there is dirt in the pipe, it should be cleaned up before hoisting.

(4) Before the pipe is bonded, try to insert it to ensure that the socket and socket meet the requirements, and mark the insertion depth on the surface of the pipe end according to the measured socket depth of the pipe fitting (the insertion depth is the socket depth when bonding).

(5) Glue coating: first coat the socket, then coat the socket, and repeat for 2 ~ 3 times. The socket should be coated with solvent from the inside out, and the socket should be coated from the pipe end to the insertion depth mark. The solvent should be coated quickly, evenly and properly, and the bonding surface should be kept wet and softened during the bonding process. Use a brush when applying soluble glue. The brush should be wide and small, and it should be placed in an open container with a cover, which can be opened when using it.

(6) Connecting and curing. After the socket and socket are coated with solvent, immediately find the right direction to insert the pipe end into the socket, and squeeze hard to make the pipe end insert into the pre-marked insertion depth mark (inserted into the bottom of the socket), and ensure the straightness of the socket and socket; At the same time, the necessary force application time must be kept at 1 ~ 3 minutes to prevent the interface from slipping. When inserting the 1/2 socket, it should be rotated slightly, but not more than 90, and it cannot be rotated after being inserted into the bottom.

(7) After cleaning the socket and socket, the excess adhesive extruded shall be wiped off.

(8) Air ducts and pipelines shall be fixed with supports and hangers. Brackets and pipes should be fixed firmly without looseness; The indoor vent in the high-rise area of this project is installed on the side wall, so the part of the PVC rigid pipe that extends into the room can't lean out of the wall hole (hole), and it's better to retract into the wall hole (hole); In multi-layer area, it is advisable for PVC rigid pipe to extend 20cm through the hole in the wall.

2. What materials are needed for the pipeline installation of fresh air system?

(1) pipeline

Pipes include PVC hard pipes, aluminum foil PVC hoses and flat pipes.

(2) End tuyere

In the process of pipe connection, each room should have a fresh air outlet and an air outlet. The types of air outlets in the market are: adjustable fresh air outlet, inclined louver fresh air outlet, single-layer louver fresh air outlet, adjustable rotating fresh air outlet and ground air supply fresh air outlet.

(3) lintel device

In the installation process, the lintel is generally used when the air duct passes through the load-bearing balance beam, and the intersection of the exhaust duct and the fresh air duct can be completed by using the lintel.

(4) Clamp

In pipeline installation, the clamp plays a fixed role. It is recommended to install one clamp every 0.5 meters, and the number of clamps can be appropriately increased in special locations.

(5) Tee elbow

The branch of the main pipeline adopts oblique tee, which has various specifications. According to the specifications of the selected main pipe and branch pipe, the specifications of the oblique tee are determined to realize diameter reduction. Pay attention to the use of 45-degree reducer in the process of reducing diameter, and direct reducing diameter is not allowed.

(6) aluminum foil tape

At the joint between the pipeline and the air inlet and outlet of the main engine, the joint of each section of pipeline is fixed with tin foil tape, and the tape is required to be flat, wrinkle-free and airtight, and finally fixed with a tie.

(7) Silencing cotton and thermal insulation cotton

The pipeline from the fan to the outdoor part is wrapped with thermal insulation cotton to reduce energy waste; Wrap silencing cotton in the pipe of the room to be silenced to reduce noise.