What are the design and construction features of capillary fittings? How do these features affect their performance and fit?

The design and construction features of capillary fittings have a significant impact on their performance and fit. Here are some key design and construction features and how they affect the performance and fit of capillary fittings:

1. Design Features
1.1 Size and Shape
Features: Capillary fittings are usually designed with a specific size and shape to match the outer diameter of the capillary. These fittings can be straight, curved, or have a variety of configurations.
Impact: The right size and shape ensure that the capillary fits precisely, providing a tight connection and avoiding leaks. The wrong size or shape may result in a loose connection or poor seal.
1.2 Fastening and Fixing Methods
Features: The fastening methods of capillary fittings usually include crimping, threading, or welding. Crimping is a common method that compresses the fitting to form a tight connection.
Impact: The fastening method directly affects the firmness and sealing performance of the connection. Crimping connections can achieve high-strength connections without the need for additional tools, while threading and welding require additional tools and processes.
1.3 Sealing Mechanism
Features: Some capillary fitting designs include built-in sealing rings or gaskets to enhance sealing and prevent liquid or gas leakage.
Impact: The presence of the sealing mechanism improves the sealing performance of the fitting and is suitable for application scenarios where leakage prevention is required. Selecting the appropriate sealing material and design can effectively improve the reliability of the connection.
1.4 Material Selection
Features: Capillary fittings can be made of a variety of materials, including copper, stainless steel, plastic, etc. The selection of these materials depends on the requirements and environmental conditions of the application.
Impact: The choice of material affects the corrosion resistance, high temperature resistance, pressure resistance and compatibility with the fluid of the fitting. For example, stainless steel fittings have excellent corrosion resistance and are suitable for harsh environments.
2. Structural Features
2.1 Inner and Outer Diameter Design
Features: The inner and outer diameter design of the capillary fitting needs to match the diameter of the capillary to ensure good contact and connection.
Impact: The appropriate inner and outer diameter design ensures smooth fluid flow and reduces pressure loss and flow resistance. Mismatched diameters may result in obstructed fluid flow or loose connections.
2.2 Wall Thickness
Features: The wall thickness of a capillary fitting affects its strength and pressure resistance.
Impact: Thicker walls increase the strength and pressure resistance of the fitting and are suitable for high-pressure applications. Thin-walled fittings are suitable for low-pressure environments and may be lighter.
2.3 Corrosion Resistance
Features: Many capillary fittings have special surface treatments or coatings to enhance corrosion and wear resistance.
Impact: Surface treatment improves the durability of the fitting in chemical environments, preventing corrosion and wear. Suitable for applications with contact with corrosive liquids or gases.
2.4 Smoothness of Connection Parts
Features: The connection parts of capillary fittings need to have good smoothness to ensure smooth insertion and tight fit of the capillary.
Impact: Smooth connection parts reduce friction and are easy to install, while improving the sealing and reliability of the connection. Unsmooth connection parts may cause installation difficulties and poor sealing.
3. Performance and Applicability
Sealing: Good design and structural features ensure that the fitting maintains good sealing during operation to prevent fluid leakage.
Durability: Appropriate materials and structural design improve the durability of the connector, making it stable in long-term use.
Scope of application: Capillary connectors with different designs are suitable for different application scenarios, including liquid delivery, gas transmission, cooling systems, etc. Selecting the appropriate design and structural features can ensure the effectiveness and reliability of the connector in a specific application.