Abstract: A first exemplary aspect is a cooling apparatus 100 including: a heat insulator 70 covering at least a part of a target object 80; a supply pipe 30 connected to a space 81 between the heat insulator 70 and the target object 80; a crusher 21 configured to supply a sublimable coolant powder to the supply pipe 30; and an air cooler 22 configured to jet gas to the supply pipe 30 so that the coolant powder 42 flows therethrough.

Abstract: A scroll compressor includes a fixed scroll, a movable scroll revolvable with respect to the fixed scroll, and a crankshaft rotatable to cause the movable scroll to revolve. A discharge port is formed in a first scroll of the fixed scroll or the movable scroll. A cutout portion is formed in a second scroll of the fixed scroll or the movable scroll. The cutout portion formed in the second scroll at least partially passes through a profile of the discharge port formed in the first scroll because of revolution of the movable scroll.

Abstract: A scroll compressor includes a fixed scroll and a movable scroll. The fixed scroll has a spiral fixed-side wrap positioned upright on a surface of a fixed-side plate. The movable scroll is orbitably disposed to face the fixed scroll. The movable scroll has a spiral movable-side wrap positioned upright on a surface of a movable-side plate, with the movable-side wrap being configured to mesh with the fixed-side wrap. A side clearance is formed between a side surface of the fixed-side wrap and a side surface of the movable-side wrap so as to increase from an outer peripheral side toward an inner peripheral side of each of the wraps.

Abstract: A compressor includes a housing member having an injection passage communicating with a compression chamber, a check valve in the injection passage, and an injection pipe that supplies refrigerant to the injection passage. The check valve has a slidable valve body, and a valve supporting member that restricts movement of the valve body toward the injection pipe side when the check valve checks a flow of refrigerant. A center hole is formed in the valve body. A peripheral hole is formed in the valve supporting member and opposes a rim part of the valve body. Refrigerant passes through the peripheral and center holes and is supplied to the compression chamber. The center hole can be closed by the valve supporting member, and the peripheral hole can be closed by the rim part of the valve body when the check valve checks the flow of refrigerant.

Abstract: A scroll compressor includes fixed and movable scrolls having a fixed and movable side plates and fixed and movable side laps to form first and second compression chambers. The fixed-side plate includes a discharge port and a relief hole extending from the front face through to the back face. The relief hole communicates for a predetermined amount of time with each of the first and second compression chambers and is shared by the first and second compression chambers. The front face of the movable-side plate includes a recessed part allowing the second compression chamber and the discharge port to communicate. The second compression chamber, during a latter stage of compression, and the discharge port communicating via a gap formed between a tip of the fixed-side lap and the recessed part before communicating via a side face gap formed between the fixed-side lap and the movable-side lap.

Abstract: A scroll compressor includes a compression mechanism having fixed and movable scrolls to form a fluid chamber. The fixed scroll has an end plate, an outer peripheral wall, and a wrap. The movable scroll has an end plate and a wrap. A scroll oil groove is formed in a sliding contact surface of the outer peripheral wall. Lubricating oil having a high pressure corresponding to a discharge pressure of the compression mechanism is fed into the scroll oil groove. A scroll oil groove is formed in a sliding contact surface of the movable scroll, which slides on the outer peripheral wall. The fixed and movable scroll oil grooves communicate with each other without communicating with the fluid chamber in a first operation. The movable scroll oil groove simultaneously communicates with the fixed scroll oil groove and the fluid chamber in a second operation after the first operation.

Abstract: A scroll compressor includes fixed and movable scrolls having a fixed and movable side plates and fixed and movable side laps to form first and second compression chambers. The fixed-side plate includes a discharge port and a relief hole extending from the front face through to the back face. The relief hole communicates for a predetermined amount of time with each of the first and second compression chambers and is shared by the first and second compression chambers. The front face of the movable-side plate includes a recessed part allowing the second compression chamber and the discharge port to communicate. The second compression chamber, during a latter stage of compression, and the discharge port communicating via a gap formed between a tip of the fixed-side lap and the recessed part before communicating via a side face gap formed between the fixed-side lap and the movable-side lap.

Abstract: A compressor includes a housing member having an injection passage communicating with a compression chamber, a check valve in the injection passage, and an injection pipe that supplies refrigerant to the injection passage. The check valve has a slidable valve body, and a valve supporting member that restricts movement of the valve body toward the injection pipe side when the check valve checks a flow of refrigerant. A center hole is formed in the valve body. A peripheral hole is formed in the valve supporting member and opposes a rim part of the valve body. Refrigerant passes through the peripheral and center holes and is supplied to the compression chamber. The center hole can be closed by the valve supporting member, and the peripheral hole can be closed by the rim part of the valve body when the check valve checks the flow of refrigerant.

Abstract: Provided is a DC motor capable of eliminating a DC current reverse rectification performed in a conventional DC motor and enabling rotation of maximum torque at all rotation angle and having a shape and a function for facilitating a combination with a speed change gear mechanism. Also provided is a planetary gear dynamo using the shape and the function of the present invention and capable of reducing inverse torque when the function is used as a generator.

Abstract: Provided is a DC motor capable of eliminating a DC current reverse rectification performed in a conventional DC motor and enabling rotation of maximum torque at all rotation angle and having a shape and a function for facilitating a combination with a speed change gear mechanism. Also provided is a planetary gear dynamo using the shape and the function of the present invention and capable of reducing inverse torque when the function is used as a generator.