Coils for electric valves, electric valves, and refrigeration cycle systems

Abstract

The present invention aims to provide an electric valve coil, an electric valve, and a refrigeration cycle system that can be easily assembled while ensuring a predetermined level of waterproofing performance. [Solution] The electric valve coil 2 comprises a coil case 30 that houses a winding 22 inside, and is mounted on the electric valve body 1, which is the object to be mounted, via an insertion hole 33 centered on the axis L. The electric valve coil 2 comprises a waterproof cap 40 fixed to the coil case 30, and the coil case 30 and the waterproof cap 40 are provided with positioning parts A that engage with each other to position their circumferential positions around their respective axes L.

Claims

1. A coil for an electric valve, comprising a coil unit having a bobbin around which a winding is wound and a yoke assembled to the bobbin, and an upper wall portion covering the upper part of the coil unit, wherein the coil is mounted to an object via a fitting hole centered on the axis, The upper wall portion is equipped with a waterproof cap, The upper wall portion and the waterproof cap are provided with positioning portions that engage with each other to position their circumferential positions around their respective axes. The upper wall portion is provided with a through hole that is continuous with the insertion hole. The waterproof cap comprises a convex cap body that covers the through hole, and a flange-shaped portion that extends radially perpendicular to the axis from the opening edge of the cap body. The flange portion abuts against the upper wall portion, A ventilation passage is provided in at least one of the bottom surface of the flange portion and the upper wall portion, extending in the radial direction and communicating with the inside and outside of the waterproof cap. A coil for an electric valve, further comprising an engaging portion that defines the relative position with respect to the object to which it is attached by engaging with the object to which it is attached.

2. The positioning portion comprises at least one recess provided on the periphery of the through hole or the cap body, and at least one protrusion provided on the periphery of the through hole or the cap body, The electric valve coil according to claim 1, characterized in that the waterproof cap is fixed to the upper wall portion in a state in which the convex portion and the concave portion are fitted together.

3. The electric valve coil according to claim 2, characterized in that the waterproof cap is fixed to the upper wall by the fitting of the protrusion and the recess, or by adhesive or welding in addition to the fitting of the protrusion and the recess.

4. The coil for an electric valve according to claim 3, characterized in that the protrusions are provided in multiple locations at equal intervals in the circumferential direction, protruding from the bottom surface of the flange portion or the upper surface of the upper wall portion.

5. The coil for an electric valve according to claim 4, characterized in that the recesses are provided in multiple locations at equal intervals in the circumferential direction on the bottom surface of the upper wall or the flange.

6. The electric valve coil according to claim 1, characterized in that the aforementioned ventilation passage is composed of one or more grooves or holes.

7. The electric valve coil according to claim 1, characterized in that the waterproof cap is made of resin or rubber.

8. An electric valve comprising an electric valve coil according to any one of claims 1 to 7, and an electric valve body to be mounted.

9. A refrigeration cycle system comprising a compressor, a condenser, an expansion valve, and an evaporator, wherein the electric valve described in claim 8 is used as the expansion valve.

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