Scroll type compressor having an intercommunication path in which a pin member is inserted
A scroll type compressor including a fixed scroll, a movable scroll engaged with the fixed scroll, and a hermetically sealed container in which the fixed scroll and the movable scroll are mounted. The fixed scroll or the movable scroll has an intercommunication path for lubricating oil that is opened to the outside of the one scroll at one end thereof, extends radially inside the scroll and has a high-pressure opening intercommunicating with a high-pressure portion of the container and a low-pressure opening intercommunicating with a low-pressure portion in the scroll, a pin member disposed in the intercommunication path so as to be movable radially in the scroll, a screw member closing one end of the intercommunication path, and a stopper provided at a predetermined position in the intercommunication path to regulate radial movement of the pin member.
1. A scroll type compressor comprising:
a fixed scroll;
a movable scroll engaged with the fixed scroll; and
a hermetically sealed container in which the fixed scroll and the movable scroll are mounted, wherein:
one scroll of the fixed scroll and the movable scroll includes:
an intercommunication path that is opened to the outside of the one scroll at one end thereof, extends substantially in a radial direction of the one scroll and has a high-pressure opening intercommunicating with a high-pressure portion of the hermetically sealed container and a low-pressure opening intercommunicating with a low-pressure portion in the one scroll, oil being supplied from the high-pressure opening through an inside of the intercommunication path to the low-pressure opening;
a pin member that is configured to be slightly smaller in diameter than the intercommunication path and disposed in the intercommunication path so as to be movable in the radial direction of the one scroll by a predetermined distance; and
a screw member that is provided at one end of the intercommunication path so as to close the one end of the intercommunication path, is provided as a separate component from the pin member and is disposed so as to be spaced from the pin member, wherein:
the pin member is configured so as to move in the radial direction apart from a side of the screw member to a side of the low-pressure opening due to a pressure difference between the high-pressure portion and the low-pressure portion,
the intercommunication path has a first path opened to the outside of the one scroll at one end thereof and a second path,
a step portion is disposed at an interface of the first and second paths serving as a stopper,
the pin member is inserted in the first path,
a diameter of the first path is larger than a diameter of the pin member and a diameter of the second path, and
the diameter of the pin member is larger than the diameter of the second path.
2. The scroll type compressor according to claim 1 , wherein the intercommunication path has a linearly extending portion in the movable scroll.
3. The scroll type compressor according to claim 1 , wherein the pin member is sucked to the low-pressure opening opened to the low pressure portion due to a pressure difference between the high pressure portion and the low pressure portion to thereby restrict a gap between an outer periphery of the pin member and the low-pressure opening opened to the low-pressure portion.
4. The scroll type compressor according to claim 1 , further comprising a stopper that is provided at a predetermined position in the intercommunication path and regulates movement of the pin member in the radial direction of the one scroll so that the pin member is movable between the screw member and the stopper.