Sealing structure for pipeline connector of R744 air conditioner heat pump system

Abstract

The invention relates to a sealing structure for a pipeline connector of an R744 air conditioner heat pump system. The sealing structure comprises an air conditioner hard pipe, an air conditioner hose, an air conditioner pipe opposite part arranged outside the air conditioner hose in a sleeving manner, a connecting part connected with the air conditioner pipe opposite part, a spherical joint in sealed connection with the connecting part, and a transition joint connected with the spherical joint, wherein the transition joint is connected with the air conditioner hard pipe; the spherical joint is sleeved with a metal spherical gasket and then is in sealed connection with the connecting part; the metal spherical gasket is installed on the spherical joint in an externally-embedded manner, andthe metal spherical gasket is connected with an inwards-concave square groove of the connecting part in place through a protruding square body of the head of the spherical joint; and a nut and the connecting part are screwed, the spherical joint is axially screwed and extruded through the nut, and therefore the metal gasket on the joint locally deforms to achieve sealing. Compared with the prior art, the sealing structure has the beneficial effects of being stable and reliable in sealing, wide in application range, low in assembling requirement and the like.

Description

technical field [0001] The invention relates to the technical field of the R744 air-conditioning heat pump system, in particular to a sealing structure for the pipeline interface of the R744 air-conditioning heat pump system. Background technique [0002] At present, under the environment of developing refrigerant substitutes, CO2 stands out among many substitutes due to its environmental protection and excellent thermal properties. CO2 is in the transcritical circulation state, and the temperature difference in the gas cooler is large, which makes it widely used in the heat pump hot water system. [0003] R744 (C02) air-conditioning heat pump system has a working pressure of up to 170bar and a working temperature of -40°C to 170°C. At present, the R744 (C02) air-conditioning pipeline interface is connected by a pressure plate and tightened by bolts, and is realized by compressing metal gaskets or non-metallic elastic washers. Sealing, however, non-metallic elastic gaskets ...

AI Technical Summary

Problems solved by technology

[0003] R744 (C02) air-conditioning heat pump system has a working pressure of up to 170bar and a working temperature of -40°C to 170°C. At present, the R744 (C02) air-conditioning pipeline interface is connected by a pressure plate and tightened by bolts, and is realized by compressing metal gaskets or non-metallic elastic washers. Sealing, however, non-metallic elastic gaskets only play a fixed role, metal gaskets are easily damaged, very sensitive and fragile, and the risk of leakage is extremely high

As for the specific sealing method used, the most commonly used method is the eccentric compression metal gasket seal on the end face of the pressure plate. The compression deformation of this compression method is not uniform enough.

Moreover, this connection and sealing method requires high processing dimensional accuracy of the parts, and if the parts do not match each other well during assembly, effective sealing cannot be achieved, that is, the structure of the pressure plate cannot meet the high pressure (170bar) of the air-conditioning pipeline. and performance requirements under high and low temperature (-40°C ~ 170°C) working conditions; at the same time, there is a certain risk in its durability under high and low temperature cycle pulses in actual working conditions

Images