Pilot-type control valve and multi-connected air conditioner

Abstract

The invention provides a multi-connected air conditioner and a pilot-type control valve thereof, and can improve main valve core motion reliability; the pilot-type control valve comprises a main valve and a pilot valve; the main valve comprises a main valve port and a main valve core starting / closing the main valve port; the pilot valve is connected with the main valve core through a valve needle having a first permanent magnet; the main valve core is provided with a second permanent magnet; the first and second permanent magnets are opposite in magnetism, and can attach so as to drive the main valve core to open the main valve port; when the valve needle is opened, the main valve core can be pushed by valve chamber pressure difference so as to move upwards, and can move upwards along with the valve needle through mutual attaching active force of the two permanent magnets, i.e., the main valve core can be driven by the pressure difference and magnetic attractive force so as to realize full opening of the main valve port, thus reducing minimum pressure difference needed for main valve core motions, and improving usage reliability.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a pilot control valve for controlling a refrigeration medium. The present invention also relates to a multi-connected air conditioner that uses the above-mentioned pilot control valve to control the refrigerating medium. Background technique [0002] In a multi-connected air conditioner in which one outdoor unit has multiple indoor units, a pilot control valve is usually used to connect between the outdoor unit and the indoor unit in order to control the cooling medium. [0003] Please refer to figure 1 , figure 1 It is a structural schematic diagram of a pilot control valve in a specific implementation in the prior art. [0004] Patent No. CN101122343A discloses a pilot control valve, which uses an electric pilot valve to ensure the slow opening of the piston and reduce the impact on the product caused by the operation of the piston. The pilot control valve includes a ...

AI Technical Summary

Problems solved by technology

[0007] However, when the main valve core 14' is closed, the compression deformation of the spring 15' will generate a relatively large reaction force on the main valve core 14', and transmit the reaction force to the valve needle 21' of the electric pilot valve 2', On the other hand, the main valve core 14' needs to repeatedly open and close the main valve port 13', so the spring 15' also bears repeated compression deformation. During the repeated compression process, the spring 15' is prone to fatigue failure, thereby reducing the reliability of the main valve core 14' opening and closing; moreover, affected by the manufacturing accuracy of the spring 15', it is difficult to control the verticality of the spring 15' during the compression process. When the spring 15' When the deformation direction of ' and the movement direction of the main spool 14' are no longer on the same straight line, the spring 15' will produce a force that deviates from the vertical direction on the main spool 14', causing the main spool 14' to deflect, thereby increasing the main spool 14'. The frictional resistance suffered by the spool 14' during its movement

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