Pilot valve for four-way reversing valve and assembly method thereof

Abstract

The invention provides a pilot valve used for a four-way reversing valve, comprising a hollow valve seat which is provided with a first inlet, a second inlet and an outlet, a fixed valve core which is arranged in the valve seat and is provided with an axial through hole, a first inlet with the first end thereof communicated with the valve seat, a second inlet with the second end thereof communicated with the valve seat and a radial intercommunicating pore by which the axial through hole and the outlet of the valve seat are communicated, a sliding valve core which passes through the axial through hole of the fixed valve core and comprises a first sealing part which is arranged at the first end of the sliding valve core so as to seal the first end of the axial through hole of the fixed valve core, a second sealing part which is arranged at the second end of the sliding valve core so as to seal the second end of the axial through hole of the fixed valve core, and an electromagnetic driving component which comprises an attractor which is connected with the valve seat, and a core iron which is connected with the sliding valve core. Compared with the pilot valve used for the existing four-way valve, the pilot valve of the invention has the advantages of few parts, low cost, high batch processability and convenient assembly.

Description

technical field [0001] The invention relates to an electromagnetic pilot valve structure of a four-way reversing valve for an air conditioner. Background technique [0002] The large-capacity piston-type four-way reversing valve used in central air-conditioning usually includes a main valve, a pilot valve and an electromagnetic coil for operating the pilot valve at present. The electromagnetic coil controls the pilot valve to take different connection states through the change of power-on and power-off, and the different connection states finally lead to the switching of the position state of the main valve. [0003] Fig. 1 is a schematic diagram of a pilot valve of an existing four-way reversing valve, and Fig. 2 is an exploded view of the pilot valve. As shown in the figure, the pilot valve consists of an attractor 1, a sleeve 2, a core iron spring 3, a core iron 4, a square seat 12, a round valve seat 13, two left and right swing rod valve plates 14, and two left and rig...

AI Technical Summary

Problems solved by technology

[0006] In the above process, due to the need to use the brazing process in many places of the pilot valve, the welding temperature is high, and oxide skin will be generated inside the valve body, and it cannot be cleaned. After the oxide skin falls off, it will easily cause system pollution; under the action of high temperature, If the protection is not proper, the compression spring of the round valve plate will also lose its elasticity due to annealing, causing the swing rod valve plate to fail to reset, and no effective pressure difference can be formed at both ends of the piston, which will eventually cause the four-way valve to fail to change direction, which may cause a major quality accident. risks of

Images