A joint and a nitrogen-filled welding connection device using the joint

Abstract

The invention provides a connector and a nitrogen filling welding connection device using the connector. The connector comprises an elastic conical sleeve with a small front end and a large rear end, wherein the elastic conical sleeve is provided with a connection structure used for being connected with an air outlet of an air source and an outer conical surface used for being connected with rigid pipes, annular grooves where the ends of rigid pipes of different pipe diameters are correspondingly inserted are formed in the outer conical surface of the elastic conical sleeve in the axial direction at intervals, and deformation areas in extrusion and interference fit with the rigid pipes are formed at the front side groove edges of the annular grooves and the conical surface parts adjacent to the front side groove edges. When the connector is connected, the rigid pipes are assembled in pace by being inserted into the corresponding annular grooves, the use requirements can be met, the clear assembly standard is provided, and the problem that the rigid pipes or the rubber conical sleeve is damaged as staff insert the rigid pipes excessively is avoided.

Description

technical field [0001] The invention relates to a joint and a nitrogen-filled welding connection device using the joint. Background technique [0002] At present, hydrochlorofluorocarbon or hydrofluorocarbon refrigerants (commonly known as "freon") are commonly used in small and medium-sized cold storages. The pipes of this kind of cold storage refrigeration system mostly use copper pipes. The connection types between copper pipes, copper pipes and refrigeration accessories (solenoid valve, oil separator, etc.) include sodium connection and welding, and welding is generally used when the diameter of the copper pipe used is large. Copper pipe welding generally uses gas welding. If the gas welding process is carried out directly in the air without suitable welding protection measures, after the copper pipe is welded, a large amount of oxide skin will be produced on the inner and outer walls near the weld. In the later stage of the installation of the refrigeration system, alt...

AI Technical Summary

Problems solved by technology

[0004] The Chinese utility model patent with the notification number CN203509384 discloses a nitrogen-charging tool and an air-conditioning welding tool with the nitrogen-charging tool. The sealing joint is connected with the inflation port and flushed with nitrogen gas. Although this nitrogen filling tool also reduces the labor intensity of workers to a certain extent, this joint needs to be aligned with the gas needle when it is used, and the docking is not very convenient. At the same time , the structure of this nitrogen-filled joint is relatively complicated, and it is only suitable for small refrigeration devices such as air conditioners

[0005] The Chinese utility model patent with the notification number CN203517104 discloses a pipeline pressure quick-change joint. The front end of the joint body of this joint is provided with a tapered rubber cone sleeve, and the rear end is connected to the hose through a clamp. The rubber taper sleeve is connected to the pipe, and the structure is relatively simple. However, when the rubber taper sleeve of this joint is connected to the pipe, the part of the rubber taper sleeve and the pipe is elastically deformed, and an end perpendicular to the pipe will be generated at the end of the pipe. With the elastic force facing backward, when the pressure of the gas passing through the pipeline is high, the pipe is easily detached from the rubber taper sleeve and the connection fails. At the same time, this joint is because there is no definite insertion position when the pipe is connected In order to make the connection firm, the staff often apply a lot of pressure to insert the pipe into the rubber cone sleeve. There is often a problem of over-insertion. After a long period of use, it often causes damage to the rubber cone sleeve and the end of the tube. Damage, and the strength of different workers is different, and the firmness of the plugging is quite different, which affects the stability of the connection during use.

Images