Split air-conditioner using aluminium refrigerant pipeline

Abstract

A connecting tube specially used to connect the indoor and outdoor machines of air conditioner is characterized in that: the coolant connecting tube is all made from aluminum alloy, whose two ends are provided with external screws. The coolant connecting tube is communicated with the connecting tube of stop valve via a stainless steel tube with internal screw, while the stainless tube has two different internal screws that one internal screw is engaged with the external screw of the connecting tube of stop valve, and another one internal screw is engaged with the external screw of the ends of coolant connecting tube. The connection at the screws is coated with liquid band to be sealed. The invention has low cost, without electrochemical corrosion at the connection with stop valve, and without welding.

Description

technical field [0001] The present invention only relates to a split-type air conditioner using aluminum refrigerant pipelines, in particular to a split-type air conditioner dedicated to connecting pipelines made of aluminum refrigerants between indoor units and outdoor units. Background technique [0002] The basic structure of the currently known split-type air conditioners is composed of two parts, that is, an indoor unit for evaporating and absorbing heat of the refrigerant and an outdoor unit for condensing and releasing heat of the refrigerant. The indoor unit and the outdoor unit connect the refrigerant pipeline into a circulation loop through two refrigerant pipes. In the prior art, the two refrigerant pipes used to connect the indoor and outdoor units are generally copper pipes. In recent years, copper and aluminum pipes have also been used. Welded combined pipe or aluminum alloy pipe is used as the connecting pipeline of indoor and outdoor units. The so-called copp...

AI Technical Summary

Problems solved by technology

This crimping connection method requires high connection technology. The connection part is the port of the nozzle, and the connection contact surface is small. The two ports are easy to cause radial relative displacement, resulting in misplaced connection. After a long time of use, leakage is easy to occur. In fact, no matter how high-quality connection is installed, the split air conditioner will leak a certain amount of refrigerant every year, and it needs to be filled regularly, otherwise the cooling capacity will continue to decline. It is based on the technology brought by this connection method due to structural shortcomings

For a long time, this has become a technical problem that technicians in related fields have been eager to solve, and have proposed many improved technical solutions for this reason, such as adding a sealing ring between the bell mouth and the port of the connecting pipe of the stop valve; changing The shape of the crimping surface expands the crimping area; double bell mouths are used to compress and seal the connection, etc., but the problem of easy leakage is caused by this connection method, so its shortcomings of easy leakage have not been fundamentally changed

There is also an improved technical scheme of applying sealant on the port of the stop valve connecting pipe, but since the bell mouth is still used to connect the port of the stop valve connecting pipe by crimping, one is that the sealing surface of the port is too small , the second is for sealing, the lama mouth needs to be compressed, which will damage the sealant coating, because the compression nut of this connection method is inserted into the connecting pipe through the screw hole, and the compression seal is the connection tube bell mouth, the nut There is a gap between the nut and the refrigerant connecting pipe. After a long time, the sealant will lose its sealing effect, and the leaked refrigerant will leak out through the gap between the nut and the refrigerant connecting pipe. The leakage problem is also impossible to get Eliminate

In order to reduce production costs, in recent years, there has been a technical solution to replace copper connecting pipes with aluminum alloy connecting pipes. In this way, the ports of the connecting pipes between the Lama port and the stop valve are changed from the original connection between copper and copper to the connection between aluminum and copper. The contact connection between the connecting pipes will generate a potential difference between the copper and aluminum, which will inevitably cause electrochemical corrosion, resulting in poor sealing of the connection parts of the copper and aluminum pipes, and finally causing the refrigerant leakage problem to become more serious.

Therefore, in response to this problem, there has been a technical solution to replace the copper connecting pipe with a copper-aluminum welded composite pipe. The two ends of the connecting pipe are still copper pipes, and the longer part in the middle is an aluminum pipe, which maintains the connection between the copper connecting pipe and the cut-off pipe. The connection of the connecting pipe of the valve is still the connection between the copper and the copper, but because the welding between the two copper pipes and the aluminum pipe in the middle is still the contact connection between the aluminum and the copper, it will also cause electrochemical corrosion and damage Finally, the problem of refrigerant leakage will arise. At the same time, due to the increase of the welding process and the increase of production costs, only in terms of welding technology, it will also cause a certain degree of leakage. This connection method also has a disadvantage, the pressure Copper nuts are still required for tight connection nuts, otherwise there will still be problems of electrochemical corrosion, and the purpose of obtaining copper connecting pipes for all-aluminum aluminum alloy refrigerant connecting pipes cannot be achieved

Therefore, people have proposed many improvement measures again to this again, as galvanizing the welding place, coating anticorrosion agent, socketing plastic casing, spraying one layer of plastic-sprayed layer, wrapping heat-shrinkable tube etc., this is just to welding The radial surface of the part has been treated, but the welding part of the copper-aluminum tube will still produce a potential difference through the welding part, and the problem of electrochemical corrosion still exists. In addition, when the indoor and outdoor units are relatively far away, the refrigerant connecting pipe needs to To lengthen, the usual method is to cut and separate the existing refrigerant connecting pipe, add the connecting pipe of the required length, and then weld it

Due to the thinness of the refrigerant connecting pipe, it is difficult to ensure the quality of on-site welding, which brings the quality hidden danger of easy leakage for the use of air conditioners

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