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(11) | EP 1 712 792 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Control valve for variable capacity compressors |
| (57) There is provided a control valve for a variable capacity compressor, which is applicable
to a compressor of large capacity. This control valve comprises a valve main body
(20) equipped with a valve rod (15) having a valve body (15a), with a valve chamber
(21) having a guide hole (19) in which the valve rod is enabled to slide and a valve
aperture (22) for the valve body, with a cooling medium inlet port (25) disposed on
an upstream side of the valve aperture for introducing a cooling medium from the compressor,
and with a cooling medium outlet port (26) disposed on a downstream side of the valve
aperture and communicated with a crank chamber; an electromagnetic actuator (30) for
driving the valve rod to move in the direction of opening or closing the valve aperture;
and a pressure sensitive moving member (40) for driving the valve rod to move in response
to a sucking pressure of the compressor; which is characterized in that a contracted
hole portion is formed at an upper portion of the guide hole, that a diametrally reduced
rod portion (15b) to be inserted into the contracted hole portion (19b) is formed
at an upper portion of the valve rod, and that the valve rod is provided with an equalizing
hole (51) for introducing a cooling medium pressure of the cooling medium outlet port
into an equalizing pressure introducing chamber (52).
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