explain:

When the compartment space of the ship is small or there are design requirements, B-type and C-type can be selected.

Definition and Basic Functions

The compartment stuffing box is a sealing device used on ships to pass through the shaft, pipe, and other components of the cabin wall. Its main function is to prevent leakage of fluids such as seawater, oil, and gas between different compartments, while allowing components such as shafts to rotate or work normally. For example, in the propulsion system of a ship, when the stern shaft passes through the bulkhead, the compartment stuffing box will play a sealing role, preventing seawater from entering other compartments through the gap between the stern shaft and the bulkhead.

Structural composition

Packing part: This is the core component of the compartment packing box, usually made of materials with good sealing performance, such as oil immersed asbestos rope, rubber sealing ring, polytetrafluoroethylene fiber, etc. The packing is tightly filled in the annular space between the shaft or pipe and the bulkhead. When the shaft rotates, the packing can deform to a certain extent and tightly adhere to the shaft and bulkhead, thereby achieving sealing.

Cap part: The cap is used to press the packing, and it is usually fixed to the cabin wall through bolts and other connecting parts. By adjusting the tightness of the gland, the clamping force of the packing on the shaft can be controlled. If the clamping force is too small, it may cause leakage; Excessive clamping force can increase the friction of the shaft and may even damage the shaft or packing.

Lining part: The lining is usually installed between the shaft and the packing, which can support and guide the shaft, reduce the vibration and swing of the shaft. The lining material is generally chosen to be wear-resistant and corrosion-resistant, such as bronze, which can extend the service life of the lining and better protect the shaft.

working principle

When the shaft passes through the bulkhead and works in the compartment packing box, the packing tightly adheres to the shaft and bulkhead under the pressure of the gland. During the rotation of the shaft, the packing will generate certain frictional resistance, but due to its good flexibility and filling characteristics, it can maintain a sealed state. For example, for compartment stuffing boxes using oil immersed asbestos ropes as fillers, the oil in the asbestos ropes can provide some lubrication, reducing friction between the shaft and the fillers. At the same time, the combination of oil and asbestos can effectively prevent the leakage of liquids or gases.

advantage

Good sealing performance: The compartment stuffing box can effectively prevent fluid leakage between different compartments, which is crucial for the safety and normal operation of the ship. Whether it is seawater, fuel, or other liquids or gases, as long as the packing materials are selected reasonably and installed correctly, a good sealing effect can be achieved.

Strong adaptability: It can be applied to various types of shafts and pipes. By adjusting the parameters of the packing and gland, it can meet the requirements of different sizes and working conditions. And it can work in different fluid media environments, such as seawater, freshwater, oil, etc.

Simple structure and easy maintenance: Its basic structure is relatively simple, mainly composed of components such as packing, cover, and liner. During maintenance, it is generally only necessary to check the wear of the packing, adjust the tightness of the gland appropriately, or replace the worn packing.

Disadvantages and challenges

Timeliness of sealing effect: With the passage of time and the operation of the shaft, the packing will gradually wear out, leading to a decrease in sealing effect. Therefore, regular inspections and maintenance are necessary to ensure the sustained stability of the sealing performance. Especially in some high load, high-speed shaft systems, the wear of the packing may be faster.

The impact on the shaft: Due to the frictional force between the packing and the shaft, it may have a certain hindering effect on the rotation of the shaft, increasing the power loss of the shaft. Moreover, if the friction force is too high, it may also cause local overheating of the shaft, affecting its service life.

Application scenarios

Ship propulsion system: At the position where the stern shaft passes through the bulkhead, the compartment stuffing box is an essential sealing device that can prevent seawater from entering the engine room and other compartments, protecting the ship's power and other equipment.

Ship piping system: For various pipelines passing through the cabin walls, such as fuel pipes, fresh water pipes, ventilation pipes, etc., the compartment stuffing box can also play a good sealing role, ensuring that liquids or gases between different compartments will not leak from each other.