Electric three-way valve

Abstract

The invention discloses a motor-driven three-way valve which comprises an input port, a plurality of output ports and a valve core. An opening of the input port is formed in the face of a valve seat, and the plurality of output ports are arranged at intervals and provided with a plurality of openings. The valve core rotates on the valve seat in a sliding mode under the driving force of a motor portion and opens and closes the plurality of output ports selectively. The motor portion serves as a separated individual and is installed on the outer side of the upper end face of a cylindrical outer cover for leading in a refrigerant. The valve seat is arranged on the opening portion at the lower end of the cylindrical outer cover. The valve core is driven by a gear device for transferring the driving force of the motor portion and arranged in the cylindrical outer cover. The cylindrical outer cover is formed by a lateral wall with a lateral opening portion and a top portion, the valve seat is arranged on the lateral opening portion, the other lateral opening portion is arranged on the top portion through the cylindrical wall portion, a casing fixed on the wall is arranged on the other lateral opening portion in an erection mode and installed on the cylindrical outer cover, and a motor is arranged in the casing. The valve avoids large-size coils, shortens occupied space, enables the shape of the valve core to be well balanced and ensures that the valve core can slide on the valve seat in the rotating direction.

Description

technical field [0001] The present invention relates to an electric three-way valve used for switching flow paths in refrigeration cycles such as air conditioners and refrigerators. Background technique [0002] We know a valve, generally using a stepping motor as a motor, a gear is provided 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 that drives the valve core makes the valve core on the valve seat The upper sliding rotation closes one of the flow paths opened on the valve seat (refer to Japanese Patent Document 1, that is, Japanese Patent Laid-Open No. 3-28583). In addition, we also know a valve in which the opening degree of the opening is controlled by the valve body slidingly driven on the valve seat by the driving force of the gear as described above (refer to Japanese Patent Document 2, that is, Japanese Patent Publication Laid-Open). 2000-346227). [0003] In the conventional valve...

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, since the casing housing the spool and the gear and the shell with the rotor of the motor inside are integrally formed, a non-magnetic magnetic field forming the shell will be produced. If the wall of the 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, a large output power of the stepping motor is required.

As a result, the size of the electric three-way valve will increase, and when the refrigeration cycle is formed, the space occupied by the electric three-way valve will be enlarged.

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

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