Piston apparatus for four-way switch valve

Abstract

The invention discloses a piston device for a four-way switching valve used in the four-way switching valve (1). The four-way switching valve comprises: a cylindrical valve body (2); a bolt body (11) connected to an open end (2a) of the valve body through a braze welding (10); and the piston device (3) linked with a valve core and sliding in the valve body and forming an action chamber (13) with the bolt body, wherein a plate element (7) is formed by a basal part (7a) and a vertical bending part (7b) from the bottom part to the bolt side on an positive side of the action chamber. An open end (7e) of the vertical bending section of the plate element is connected to the bolt body at a position of leaving the valve body and a bolt body graft union (16). The action chamber is formed by the plate element and the bolt body. A sealing member (6) for sealing between the valve body interior and the action chamber is arranged at an opposite side with the valve body interior of the position device. The invention can ensure a normal movement of the four-way switching valve piston device, prevent a bad sealing of the sealing member between the valve body interior and the action chamber, and reliably fix the piston on a connection plate by using the bolt for stopping rotation.

Description

technical field [0001] The present invention relates to a piston device of a four-way switching valve used in equipment using a reversible refrigeration cycle, such as refrigeration equipment and air conditioners. Background technique [0002] In the past, a four-way switching valve was arranged in the refrigerant passage of the refrigeration cycle to switch the refrigerant passage and switch between indoor cooling and heating. As such a four-way switching valve, various types are proposed in Patent Documents 1 and 2, and the like. [0003] These four-way switching valves are for example Figure 6 As shown, a piston device 33 for moving a spool (not shown) is provided inside the valve body 32. The spool is used to switch fluid passages. The piston device 33 is sandwiched between the upper working chamber 43 and the lower high-pressure Chambers 44 slide inside the valve body 32 . An operation chamber 43 formed between the piston device 33 and the plug body 41 is connected t...

AI Technical Summary

Problems solved by technology

[0008] However, in the above-mentioned conventional four-way switching valve 31, since the plug body 41 is brazed to the open end portion 32a of the valve body 32 by brazing 40, there is a problem that solder or flux flows from the plug body 41. Leakage into the valve body 32 from the joint between the outer peripheral surface of the lower end and the inner peripheral surface of the upper end of the valve body 32 prevents the normal movement of the piston device 33, or creates a gap between the seal 36 and the valve body 32, causing poor sealing.

[0009] In addition, in the above-mentioned four-way switching valve 31, the bolt 38 is fixed by caulking the head of the bolt 38 from both sides with the raised portions 37a, 37b of the caulking plate 37, but the raised portions 37a, 37b are formed of a thin plate. Therefore, sufficient fixing force cannot be obtained. When the bolt 38 rotates, the erected portions 37a, 37b will expand outwards (arrow direction) from the narrow portion 37c on the riveting plate 37 surface side of the erected portions 37a, 37b. to the anti-rotation function of the bolt 38

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