Copper Nazi expanded nut metric threaded oil pipe aluminum copper pipe bell mouth lock nut copper pipe lock mother lock pipe cap

Structure and materials
Tong Na Zi
Tongnazi is usually made of brass. Brass has good machining properties, is easy to cut and forge, and can be made into a variety of precise shapes. Its structure is generally a short tubular part with internal or external threads, and one end usually has a flared structure for connection with copper or aluminum pipes.
The expanded design of the copper tube is to better match the bell mouth of the copper tube or aluminum tube to achieve sealing and connection functions.
Flared Nuts (Metric Thread)
Flared nuts are also made of metal, and common materials include copper alloy. It has metric threads for connecting to other components with matching threads. There is a conical surface inside. When the nut is tightened, this conical surface will press against the bell mouth of the copper or aluminum pipe to form a seal.
Metric threads have clear specifications, which can ensure accurate connection with corresponding oil pipe joints and other components, ensuring the tightness and reliability of the connection.
Oil pipe aluminum copper pipe
Aluminum copper pipes are used as connected pipes in these connection structures. Aluminum copper tubes have good thermal conductivity and certain flexibility, and are widely used in refrigeration, air conditioning and other systems. Copper pipes themselves have good corrosion resistance, especially in some non-strong acid and alkali environments, and can maintain the integrity of the pipeline for a long time.
When connecting oil pipe aluminum copper pipe with copper nut and flare nut, it is usually necessary to make a bell mouth at the mouth of the pipe. The production of the bell mouth requires the use of special tools to expand the mouth of the pipe to form a suitable bell shape so that it can closely match the flare nut.
Bell mouth lock nut (copper tube lock nut, lock tube cap)
Flare lock nuts are essentially similar to flare nuts and are tightened onto the bell mouth of copper or aluminum pipes to achieve sealing and connection. Its material is also usually copper alloy, which has good mechanical properties and corrosion resistance.
The main function of this nut is to prevent the pipe from loosening due to vibration and other reasons during the operation of the system, ensuring the long-term stability of the connection.
2. Performance characteristics
Good sealing
The combination of the copper nut, the flare nut, and the bell mouth lock nut can form a very good sealing effect by squeezing the bell mouth of the copper pipe or aluminum pipe. In refrigeration systems, such as air conditioner refrigerant pipelines, this connection method can prevent refrigerant leakage and ensure the normal operation of the system.
Strong connection
Due to the threaded connection and the compression mechanism against the bell mouth, once properly installed, this connection method is able to withstand a certain amount of tension and pressure, preventing the pipe from coming apart during normal use. In the oil pipe connection of the automobile brake system, this strong connection can ensure the reliability of the braking system and avoid safety hazards caused by loose oil pipe connections.
Corrosion resistance
Brass or copper alloy nuts, nuts and nuts, as well as the copper pipe itself, have good corrosion resistance in most environments. This allows them to maintain connection performance and appearance for a long time in some environments where water vapor, slight acid and alkali substances may exist, such as indoor air conditioning systems, some industrial cooling systems, etc.
Repairability
This type of connection is relatively easy to remove and reinstall. If a component in the system needs to be repaired or replaced, as long as you use the appropriate tools, you can loosen the nut or nut more easily, replace the corresponding component and then reconnect it without causing excessive damage to the pipes and connecting components. of damage.

Refrigeration and air conditioning industry
In the connection of refrigerant pipelines in refrigeration equipment such as air conditioners and refrigerators, copper nuts and expanded nuts are widely used. For example, the connection pipeline between the indoor unit and outdoor unit of a split air conditioner can ensure safe and efficient transmission of refrigerant in the pipeline, and also facilitates installation and after-sales maintenance.
Automotive industry
It is used in automobile braking systems, fuel systems and air conditioning systems. In the connection of brake oil pipes, this connection method can ensure the reliability of the braking system; in the automobile air conditioning system, it can achieve good refrigerant transmission and connection stability.
Industrial cooling system
For the cooling water circulation system of some industrial equipment, such as the cooling system of machine tools, the cooling system of large generators, etc., when copper pipes or aluminum pipes are used as cooling water pipelines, connecting components such as copper tubes can achieve reliable pipeline connections. Prevent cooling water leakage.
Hydraulic system
This connection method is also used in some small hydraulic systems, such as auxiliary hydraulic systems of construction machinery and hydraulic pipelines of automation equipment. It can ensure the normal transmission of hydraulic oil in the pipeline, and at the same time meet the requirements of the hydraulic system for connection firmness and sealing.