Self-contained regulating valve, and compression type refrigerating machine having the same

A self-operated regulating valve characterized in that

• one pressure introduced into one pressure transmission chamber, which is a space formed between a cylindrical valve body and a flange portion provided midway through a spool, acts on the flange portion of the spool;
• other pressure introduced into other pressure transmission chamber, which is a space formed between the valve body and one end surface of the spool formed axially movably in an internal space of the valve body, acts on the one end surface of the spool;
• and
• the spool moves according to a differential pressure between the one pressure and the other pressure,
• whereby the other end surface of the spool closes or opens a region between opening ends of two pipe lines connected to the valve body.

A self-operated regulating valve characterized in that

• a pressure of a fluid controlled by the self-operated regulating valve acts, as one pressure, on one end surface of a spool formed axially movably in an internal space of a cylindrical valve body;
• other pressure introduced into a pressure transmission chamber, which is a space formed between the valve body and the other end surface of the spool, and a spring force of a preload spring act on the other end surface of the spool;
• and
• a through-hole is provided in the spool,
• whereby when a difference between the one pressure and the other pressure exceeds a set value, the through-hole and pipe lines connected to the valve body communicate to bring the self-operated regulating valve into an open state, while when the difference does not exceed the set value, the through-hole and the pipe lines are cut off to bring the self-operated regulating valve into a closed state.

A compression refrigerating machine having a compressor configured such that

• a refrigerant gas is introduced into a casing of a drive motor of the compressor to cool respective portions of the drive motor, and
• then the refrigerant gas is discharged from the casing, and characterized in that
• the self-operated regulating valve claimed in any one of clams 1 to 3 is interposed midway through a pressure equalizing pipe line for equalizing a pressure on a refrigerant supply port side, where a cooling refrigerant is introduced, with a pressure on a refrigerant discharge port side, where the cooling refrigerant is discharged, within the casing of the drive motor,
• an internal pressure on the refrigerant supply port side of the casing is exerted as one pressure on the self-operated regulating valve, and
• an internal pressure on the refrigerant discharge port side of the casing is exerted as other pressure on the self-operated regulating valve,
• whereby when a differential pressure between the two pressures exceeds a set value, the self-operated regulating valve is brought into an open state.