Vehicular air conditioner

A vehicular air conditioner which conditions air of a vehicle interior, comprising:

• a compressor to compress a refrigerant;
• an air flow passage through which the air to be supplied to the vehicle interior flows;
• a radiator to let the refrigerant radiate heat, thereby heating the air to be supplied from the air flow passage to the vehicle interior;
• a heat absorber to let the refrigerant absorb heat, thereby cooling the air to be supplied from the air flow passage to the vehicle interior;
• an outdoor heat exchanger disposed outside the vehicle interior to let the refrigerant absorb or radiate heat;
• a battery temperature adjustment device to let a heat medium circulate, thereby adjusting a temperature of a battery mounted in a vehicle;
• and
• a control device,
• wherein the battery temperature adjustment device has a refrigerant-heat medium heat exchanger to perform exchange of heat between the refrigerant and the heat medium, and returns the refrigerant flowing out from the refrigerant-heat medium heat exchanger to a suction side of the compressor,
• wherein the vehicular air conditioner includes a check valve which obstructs the flow of the refrigerant flowing out from the refrigerant-heat medium heat exchanger and directed toward the outdoor heat exchanger and/or the heat absorber, and
• wherein the control device executes a second operation mode to obstruct inflow of the refrigerant into the outdoor heat exchanger, let the refrigerant discharged from the compressor to radiate heat in the radiator, decompress the refrigerant from which the heat has been radiated, and then let the refrigerant absorb heat only in the refrigerant-heat medium heat exchanger.

A vehicular air conditioner which conditions air of a vehicle interior, comprising:

• a compressor to compress a refrigerant;
• an air flow passage through which the air to be supplied to the vehicle interior flows;
• a radiator to let the refrigerant radiate heat, thereby heating the air to be supplied from the air flow passage to the vehicle interior;
• a heat absorber to let the refrigerant absorb heat, thereby cooling the air to be supplied from the air flow passage to the vehicle interior;
• an outdoor heat exchanger disposed outside the vehicle interior to let the refrigerant absorb or radiate heat;
• a battery temperature adjustment device to let a heat medium circulate, thereby adjusting a temperature of a battery mounted in a vehicle;
• and
• a control device,
• wherein the vehicular air conditioner including:
• a first refrigerant pipe into which the refrigerant flowing out from the outdoor heat exchanger flows,
• a second refrigerant pipe into which the refrigerant flowing out from the heat absorber flows,
• a third refrigerant pipe to let a joining point between the first refrigerant pipe and the second refrigerant pipe, and the suction side of the compressor communicate with each other, and
• a check valve disposed in the third refrigerant pipe,
• wherein the check valve lets the flow of the refrigerant toward the compressor serve as a forward direction,
• wherein the battery temperature adjustment device has a refrigerant-heat medium heat exchanger to perform exchange of heat between the refrigerant and the heat medium, and
• wherein the refrigerant flowing out from the refrigerant-heat medium heat exchanger is returned between the check valve and the compressor.

A vehicular air conditioner which conditions air of a vehicle interior, comprising:

• a compressor to compress a refrigerant;
• an air flow passage through which the air to be supplied to the vehicle interior flows;
• a radiator to let the refrigerant radiate heat, thereby heating the air to be supplied from the air flow passage to the vehicle interior;
• a heat absorber to let the refrigerant absorb heat, thereby cooling the air to be supplied from the air flow passage to the vehicle interior;
• an outdoor heat exchanger disposed outside the vehicle interior to let the refrigerant absorb or radiate heat;
• a battery temperature adjustment device to let a heat medium circulate, thereby adjusting a temperature of a battery mounted in a vehicle;
• and
• a control device,
• wherein the vehicular air conditioner including:
• a first refrigerant pipe into which the refrigerant flowing out from the outdoor heat exchanger flows,
• a second refrigerant pipe into which the refrigerant flowing out from the heat absorber flows,
• wherein the first refrigerant pipe and the second refrigerant pipe communicate with the suction side of the compressor,
• wherein the vehicular air conditioner includes check valves disposed in each of the first refrigerant pipe and the second refrigerant pipe, and each check valve lets the flow of the refrigerant toward the compressor serve as a forward direction,
• wherein the battery temperature adjustment device has a refrigerant-heat medium heat exchanger to perform exchange of heat between the refrigerant and the heat medium, and
• wherein the refrigerant flowing out from the refrigerant-heat medium heat exchanger is returned between each of the check valves and the compressor.

A vehicular air conditioner which conditions air of a vehicle interior, comprising:

• a compressor to compress a refrigerant;
• an air flow passage through which the air to be supplied to the vehicle interior flows;
• a radiator to let the refrigerant radiate heat, thereby heating the air to be supplied from the air flow passage to the vehicle interior;
• a heat absorber to let the refrigerant absorb heat, thereby cooling the air to be supplied from the air flow passage to the vehicle interior;
• an outdoor heat exchanger disposed outside the vehicle interior to let the refrigerant absorb or radiate heat;
• a battery temperature adjustment device to let a heat medium circulate, thereby adjusting a temperature of a battery mounted in a vehicle;
• and
• a control device,
• wherein the vehicular air conditioner including:
• a first refrigerant pipe into which the refrigerant flowing out from the outdoor heat exchanger flows,
• a second refrigerant pipe into which the refrigerant flowing out from the heat absorber flows,
• wherein the first refrigerant pipe and the second refrigerant pipe communicate with the suction side of the compressor,
• wherein the vehicular air conditioner includes a check valve disposed in f the second refrigerant pipe, and the check valve lets the flow of the refrigerant toward the compressor serve as a forward direction,
• wherein the battery temperature adjustment device has a refrigerant-heat medium heat exchanger to perform exchange of heat between the refrigerant and the heat medium, and
• wherein the refrigerant flowing out from the refrigerant-heat medium heat exchanger is returned between the check valve and the compressor.

A vehicular air conditioner which conditions air of a vehicle interior, comprising:

• a compressor to compress a refrigerant;
• an air flow passage through which the air to be supplied to the vehicle interior flows;
• a radiator to let the refrigerant radiate heat, thereby heating the air to be supplied from the air flow passage to the vehicle interior;
• a heat absorber to let the refrigerant absorb heat, thereby cooling the air to be supplied from the air flow passage to the vehicle interior;
• an outdoor heat exchanger disposed outside the vehicle interior to let the refrigerant absorb or radiate heat;
• a battery temperature adjustment device to let a heat medium circulate, thereby adjusting a temperature of a battery mounted in a vehicle;
• and
• a control device,
• wherein the battery temperature adjustment device has a refrigerant-heat medium heat exchanger to perform exchange of heat between the refrigerant and the heat medium, and returns the refrigerant flowing out from the refrigerant-heat medium heat exchanger to a suction side of the compressor,
• wherein the vehicular air conditioner includes a check valve which obstructs the flow of the refrigerant flowing out from the refrigerant-heat medium heat exchanger and directed toward the outdoor heat exchanger and/or the heat absorber,
• wherein the vehicular air conditioner further including:
• an outdoor expansion valve to decompress the refrigerant flowing out from the radiator and flowing into the outdoor heat exchanger,
• a valve device to control the inflow of the refrigerant into the heat absorber,
• a first refrigerant pipe to let the refrigerant flowing out from the outdoor heat exchanger suck into the compressor without flowing into the valve device,
• a first solenoid valve disposed in the first refrigerant pipe,
• a bypass circuit to distribute the refrigerant flowing out from the radiator from a refrigerant upstream side of the outdoor expansion valve to let the refrigerant flow to a refrigerant upstream side of the valve device,
• a second solenoid valve disposed in the bypass circuit,
• a branch circuit to let the refrigerant flowing out from the bypass circuit flow into the refrigerant-heat medium heat exchanger,
• an auxiliary expansion valve disposed in the branch circuit to decompress the refrigerant flowing into the refrigerant-heat medium heat exchanger, and
• another check valve to obstruct the flow of the refrigerant flowing out from the bypass circuit and directed toward the outdoor heat exchanger,
• wherein the control device opens the outdoor expansion valve, closes the first solenoid valve, the second solenoid valve, and the valve device, decompresses the refrigerant flowing into the refrigerant-heat medium heat exchanger by the auxiliary expansion valve, and controls the battery temperature adjustment device to thereby execute a first operation mode to let the refrigerant discharged from the compressor radiate heat in the radiator and the outdoor heat exchanger, decompress the refrigerant from which the heat has been radiated, and then let the refrigerant absorb heat in the refrigerant-heat medium heat exchanger, or opens the second solenoid valve, closes the outdoor expansion valve, the first solenoid valve, and the valve device, decompresses the refrigerant flowing into the refrigerant-heat medium heat exchanger by the auxiliary expansion valve, and controls the battery temperature adjustment device to thereby execute a second operation mode to obstruct inflow of the refrigerant into the outdoor heat exchanger, let the refrigerant discharged from the compressor radiate heat in the radiator, decompress the refrigerant from which the heat has been radiated, and then let the refrigerant absorb heat only in the refrigerant-heat medium heat exchanger, or executes by switching between the first operation mode and the second operation mode.