Guide valve type electromagnetic valve

Abstract

The present invention provides a pilot type solenoid valve capable of preventing the main valve element from not returning certainly without bringing about increase in the number of component parts, man-hours, or the cost. The pilot type solenoid valve 1 of the present invention executes opening and closing driving of the pilot valve core 35 by an electromagnetic actuator 20. A main valve element15 opening and closing complies with the motions of the pilot valve core 35. The pilot type solenoid valve 1 has a stopper preventing the main valve core 15 from moving in the opening direction, wherein the stopper is composed of a stopper surface part 50D where the end face of the main valve core 15 runs against and a recessed part 50E recessing from the stopper surface part 50D to the opening direction of the main valve core.

Description

technical field [0001] The present invention relates to a pilot valve type (Pylot type) electromagnetic valve, which is guided by an electromagnetic actuator composed of a coil for energizing and exciting, an attractor arranged on the inner peripheral side of the coil, and a plunger arranged opposite to the attractor. The spool is driven to open and close, and the main spool is opened and closed along with the pilot spool. Background technique [0002] FIG. 4 shows an example of a conventional pilot valve type solenoid valve of this type (see also Patent Document 1 and the like below). The pilot valve solenoid valve 1' of the illustrated example is used in refrigeration cycles such as air conditioners, and includes: a valve body 10, which is provided with a main valve chamber 13 having a main valve seat (valve port) 14; The inlet joint (flow port) 11 connected to the main valve chamber 13 and the outlet joint (flow port) 12 connected downstre...

AI Technical Summary

Problems solved by technology

[0011] However, in the above-mentioned existing pilot valve type solenoid valve, since the entire upper end surface (annular flat surface) of the main valve element is in surface contact with the blocking surface (annular flat surface), the The surface tension of the fluid (refrigerant) and lubricating oil on the surface (suction cup effect), sometimes even if the pilot valve core 35 wants to return to the valve closing direction, the main valve core is also adsorbed on the blocking surface and cannot be separated, and does not return to the valve closing direction. state

[0012] In order to prevent the above-mentioned problem of non-return of the main spool, it is necessary to install a special-shaped stopper or apply special processing to the main spool, resulting in an increase in the number of parts, man-hours, and cost.

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