Compressor and valve assembly

A compressor comprising:

• a compression mechanism including a compression chamber and configured to compress low-pressure refrigerant in the compression chamber into high pressure refrigerant;
• an injection pipe arranged to supply intermediate-pressure refrigerant to the compression chamber;
• and
• a valve assembly arranged between the compression chamber and the injection pipe,
• the valve assembly having
• an opening forming member that forms an opening;
• a valve body that
• moves in accordance with a difference between
• a first pressure of the refrigerant supplied from the injection pipe and
• a second pressure of the refrigerant in the middle of compression in the compression chamber;
• and
• a spring member disposed on the injection pipe side of the opening, the spring member applying a force against the valve body in a direction of the injection pipe,
• the valve body moving from an injection pipe side to a compression chamber side so as to open the opening and inject the refrigerant from the injection pipe into the compression chamber when the first pressure is higher than the second pressure, and
• the valve body moving from the compression chamber side to the injection pipe side so as to block the opening when the first pressure is lower than the second pressure, a dead volume existing between the valve body and the compression chamber when the valve body is blocking the opening, wherein
• the valve body has a flat plate-shaped portion disposed on the compression chamber side of the opening in the opening forming member,
• when the valve body is not blocking the opening, a central portion of the flat plate portion projects into the compression chamber and an end portion of the flat plate portion on one side of the opening does not project into the compression chamber.

A compressor comprising:

• a compression mechanism including a compression chamber and configured to compress low-pressure refrigerant in the compression chamber into high pressure refrigerant;
• an injection pipe arranged to supply intermediate-pressure refrigerant to the compression chamber;
• and
• a valve assembly arranged between the compression chamber and the injection pipe,
• the valve assembly having
• an opening forming member that forms an opening;
• a valve body that
• moves in accordance with a difference between
• a first pressure of the refrigerant supplied from the injection pipe and
• a second pressure of the refrigerant in the middle of compression in the compression chamber;
• and
• a spring member disposed on the injection pipe side of the opening, the spring member applying a force against the valve body in a direction of the injection pipe,
• the valve body moving from an injection pipe side to a compression chamber side so as to open the opening and inject the refrigerant from the injection pipe into the compression chamber when the first pressure is higher than the second pressure, and
• the valve body moving from the compression chamber side to the injection pipe side so as to block the opening when the first pressure is lower than the second pressure, a dead volume existing between the valve body and the compression chamber when the valve body is blocking the opening, wherein
• the valve body has a flat plate-shaped portion disposed on the compression chamber side of the opening in the opening forming member,
• when the valve body is not blocking the opening, a central portion of the flat plate portion projects into the compression chamber and both end portions of the flat plate portion do not project into the compression chamber.