Large-refrigerating capacity double-stage four-way reversing valve

Abstract

The invention relates to a large-refrigerating capacity double-stage four-way reversing valve, belonging to a valve part of a refrigerating system. The existing four-way reversing valve adopts a single-medium channel, thus being not capable of independently adapting to the demands of a small valve body and large refrigerating capacity of the refrigerating system; when a plurality of existing four-way reversing valves are used at the same time, the synchronization of the action of the four-way reversing valves can not be easily realized. The large-refrigerating capacity double-stage four-way reversing valve comprises a main valve and a guide valve, and is characterized in that a piston of the main valve is formed by three cylinder components which are connected along the axial direction; the cylindrical surface of each cylinder component is provided with two grooves arranged at the two opposite sides; the view projection of the cylinder components is in an I shape; every two adjacent cylinder components are staggered at 90 degrees along the circumferential direction; a valve body is provided with eight valve holes which are connected with a medium conveying pipe; every two valve holes are set into a group along the axial direction of the valve body; the four groups of valve holes are arranged along the circumferential direction of the valve body; the two valve holes which are adjacent along the circumferential direction of the working position are communicated with the grooves on the piston, so that a medium channel is formed; the cylinder component arranged in the middle of the piston and the grooves of the cylinder component arranged at one end of the piston are communicated with the valve holes at the same time at each working position, so that a double-medium channel is formed; the large-refrigerating capacity double-stage four-way reversing valve can double the tons of refrigeration so as to reach double-stage tons of refrigeration.

Description

technical field [0001] The invention belongs to a valve part of a refrigeration system, and in particular relates to a two-stage four-way reversing valve with a large cooling capacity. Background technique [0002] Large-capacity four-way reversing valves are generally used in heat pump air conditioners, and the cooling and heating functions can be changed through the four-way reversing valve. The usual large-capacity piston-type four-way reversing valve is composed of a pilot valve and a main valve. The main valve includes a valve body and a piston located in a cylindrical inner cavity of the valve body. The inner cavity of the valve body is closed by two end caps arranged at its two ends. , the piston separates the inner cavity of the valve into two chambers, left and right. The piston is composed of two cylindrical members axially connected as one. The two cylindrical members are provided with two grooves on the cylindrical surface, so that the view of the cylindrical me...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the current four-way reversing valve with small valve body cannot meet the needs of large-tonnage refrigeration systems alone, and multiple simultaneous connection and use cannot realize the synchronization of reversing actions. Large-capacity two-stage four-way reversing valve required for large-tonnage refrigeration systems

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