Electric switching valve

Abstract

The invention discloses a power-driven changeover valve which comprises a flow inlet with an opening in a valve seat surface and flow outlets with a plurality of openings which are arranged at certain intervals. A slidable valve core is rotated on the valve seat surface through driving force of a motor part. The vale core selectively opens and closes the plurality of flow outlets. The motor part as a separate individual is arranged on an outer side of an upper end face of a cylinder-shaped cover which is used for importing refrigerant. The valve seat surface is arranged on a lower end opening part of the cylinder-shaped cover. The valve core is driven by a gear device which transmits the driving force of the motor part and is arranged inside the cylinder-shaped cover. According to the power-driven changeover valve, large coil is avoided, an electric switch valve occupies narrow space is achieved, valve core shape can be well balanced and slide of valve core rotation direction on the surface of the valve seat surface is ensured.

Description

technical field [0001] The present invention relates to an electric switching valve used in refrigeration cycles of air conditioners and refrigerators to switch flow paths. Background technique [0002] We know a valve that generally uses a stepping motor as a motor, and a gear is arranged at the lower end of the shaft of the rotor, and the driving force of the gear generated by the screwing of the gear and the gear driving the valve core makes the valve core rest on the valve seat. The surface slides and rotates to block one side of the flow path opening on the above-mentioned valve seat surface (refer to Japanese Patent Document 1, that is, Japanese Patent Publication No. Hei 3-28583). In addition, we also know a valve, as mentioned above, through the driving force of the gear, the opening of the above-mentioned opening is controlled by the valve core slidingly driven on the above-mentioned valve seat surface (refer to Japanese Patent Document 2, that is, Japanese Patent P...

AI Technical Summary

Problems solved by technology

[0003] In the above-mentioned conventional valve utilizing the spool that slides and rotates on the valve seat surface, since the outer cover housing the spool and the gear and the shell with the rotor of the motor inside are integrally formed, there will be irregularities forming the shell. If the wall of the magnetic material such as stainless steel is thick, the above-mentioned shell becomes thicker, and the magnetic characteristics of the stepping motor decrease, and the motor torque decreases. In order to obtain the specified motor torque, the output power of the stepping motor needs to be large.

As a result, the size of the electric switching valve will increase, and when the refrigeration cycle is configured, the space occupied by the electric switching valve will increase.

[0004] In addition, in the conventional sliding and rotating spool, no consideration has been given to the shape of the spool that can slide easily and smoothly on the seat surface.

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