IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0685774
(2003-10-15)
|
우선권정보 |
JP-0305863 (2002-10-21) |
발명자
/ 주소 |
- Kurata, Shun
- Takano, Yoshiaki
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
9 |
초록
▼
In a vehicle air conditioner having front and rear air conditioning units, a refrigerant cycle includes front and rear evaporators for cooling air in a cooling mode, a hot-gas bypass passage through which hot-gas refrigerant discharged from a compressor flows into the front evaporator while bypassin
In a vehicle air conditioner having front and rear air conditioning units, a refrigerant cycle includes front and rear evaporators for cooling air in a cooling mode, a hot-gas bypass passage through which hot-gas refrigerant discharged from a compressor flows into the front evaporator while bypassing a condenser in a heating mode, and a fixed throttle between the condenser and the front evaporator for decompressing refrigerant flowing from the condenser in the cooling mode. Further, a refrigerant outlet side of the fixed throttle and a refrigerant outlet side of the hot-gas bypass passage are joined to a refrigerant pipe, and a refrigerant outlet of the refrigerant pipe is connected to a refrigerant inlet of the front evaporator. Therefore, a refrigerant pipe structure of the refrigerant cycle can be made simple.
대표청구항
▼
1. An air conditioner for a vehicle comprising:a front air conditioning unit for air-conditioning a front area in a passenger compartment of the vehicle;a rear air conditioning unit for air-conditioning a rear area in a passenger compartment;a compressor for compressing refrigerant;a condenser for c
1. An air conditioner for a vehicle comprising:a front air conditioning unit for air-conditioning a front area in a passenger compartment of the vehicle;a rear air conditioning unit for air-conditioning a rear area in a passenger compartment;a compressor for compressing refrigerant;a condenser for condensing gas refrigerant discharged from the compressor in a cooling mode;a front evaporator disposed in the front air conditioning unit, for cooling air in the cooling mode and for heating air in a first heating mode;a rear evaporator disposed in the rear air conditioning unit for cooling air in the cooling mode;a hot-gas bypass passage through which the gas refrigerant discharged from the compressor flows into the front evaporator while bypassing the condenser in the heating mode;a front decompression unit, disposed between the condenser and the front evaporator, for decompressing refrigerant flowing from the condenser in the cooling mode;a rear decompression unit, disposed between the condenser and the rear evaporator, for decompressing refrigerant flowing from the condenser in the cooling mode;a refrigerant pipe to which a refrigerant outlet side of the front decompression unit and a refrigerant outlet side of the hot-gas bypass passage are joined; anda low-pressure gas-liquid separator for separating refrigerant into gas refrigerant and liquid refrigerant, the low-pressure gas-liquid separator being coupled to a refrigerant outlet of the front evaporator and a refrigerant outlet of the rear evaporator, the low-pressure gas-liquid separator having a refrigerant outlet portion through which gas refrigerant is introduced to a suction port of the compressor, whereinthe refrigerant pipe has a refrigerant outlet that is connected to a refrigerant inlet of the front evaporator;the condenser includes first and second heat-exchanging units which are disposed in this order in a refrigerant flow direction, and a high-pressure gas-liquid separator disposed between the first heat-exchanging unit and the second heat-exchanging unit for separating refrigerant into gas refrigerant and liquid refrigerant;the front decompression unit is a fixed throttle;the high-pressure gas-liquid separator regulates a stored amount of liquid refrigerant in response to a superheating degree of the gas refrigerant discharged from the compressor that is controlled to regulate a superheating degree of the gas refrigerant at an outlet of the front evaporator when at least the front air conditioning unit is operated under the cooling mode;the rear decompression unit regulates a superheating degree of gas refrigerant at an outlet of the rear evaporator independently from an operation of the front evaporator when the rear air conditioning unit is operated under the cooling mode;a check valve is disposed between the rear evaporator and the low-pressure gas-liquid separator so as to shut a reverse flow from the low-pressure gas-liquid separator toward the rear evaporator;the low-pressure gas-liquid separator has a first inlet coupled to the refrigerant outlet of the front evaporator and a second inlet independently formed from the first inlet and coupled to the refrigerant outlet of the rear evaporator; andthe check valve is located adjacent to the second inlet.2. The air conditioner according to claim 1, further comprising:an evaporator outlet pipe having one end connected to the refrigerant outlet of the rear evaporator, and the other end connected to the low-pressure gas-liquid separator; wherein:the evaporator outlet pipe has a wall portion defining a reduced passage area; andthe check valve has a valve body that contacts the wall portion when the reverse flow is shut.3. The air conditioner system according to claim 2, further comprising:an engagement portion provided in the valve body, wherein the engagement portion is engaged with the wall portion to regulate an opening degree of the check valve when the valve body is moved to a valve-opening position.4. The air conditioner according to claim 1, further comprising:an evaporator outlet pipe including a first pipe portion connected to the refrigerant outlet of the rear evaporator, and a second pipe portion connected to the low-pressure gas-liquid separator; whereinthe check valve is disposed between the first pipe portion and a second pipe portion to be connected therebetween.5. The air conditioner according to claim 1, wherein:the refrigerant outlet side of the fixed throttle and the refrigerant outlet side of the hot-gas bypass passage are joined to the refrigerant pipe outside the passenger compartment, andthe refrigerant pipe is piped as a single introducing pipe from refrigerant cycle components outside the passenger compartment to the front air conditioning unit mounted in the passenger compartment.6. The air conditioner according to claim 5, further comprising a valve device for switching the cooling mode and the heating mode and a joint portion at which the refrigerant outlet side of the fixed throttle and the refrigerant outlet side of the hot-gas bypass passage are joined, whereinthe refrigerant pipe extends from the valve device to the front evaporator.7. The air conditioner according to claim 6, wherein:the valve device is disposed on the condenser.8. The air conditioner according to claim 1, further comprising:a front heater core for providing the front area in a passenger compartment of the vehicle with a second heating mode;a rear heater core for providing the rear area in the passenger compartment of the vehicle with air conditioning; whereinthe high pressure gas-liquid separator accumulates liquid refrigerant only in the cooling mode;the rear decompression unit is constructed with a thermal expansion valve connected between the condenser and the rear evaporator;the low pressure gas-liquid separator accumulates liquid refrigerant only in the heating mode; andthe front decompression unit and the rear evaporator decompression unit are connected to the compressor by a high pressure liquid refrigerant pipe.9. The air conditioner according to claim 1, wherein the second inlet of the low-pressure gas-liquid separator is provided with the check valve.10. The air conditioner according to claim 1, wherein:the low-pressure gas-liquid separator and the check valve are assembled as a single unitary component disposed outside the passenger compartment spaced from the rear evaporator.11. The air conditioner according to claim 10, wherein the check valve is threaded into the second inlet of the low-pressure gas-liquid separator.12. The air conditioner according to claim 10, wherein the check valve is integrally provided with the second inlet of the low-pressure gas-liquid separator.13. An air conditioner for a vehicle comprising:a front air conditioning unit, including a front evaporator and a front heater core, for providing a front area in a passenger compartment of the vehicle with air conditioning that includes a cooling mode and a heating mode;a rear air conditioning unit, including a rear evaporator and a rear heater core, for providing a rear area in the passenger compartment of the vehicle with air conditioning;a compressor for compressing refrigerant;a condenser for condensing gas refrigerant discharged from the compressor in the cooling mode, the condenser including first and second heat-exchanging units which are disposed in a refrigerant flow direction and a high pressure gas-liquid separator, disposed between the first heat-exchanging unit and the second heat-exchanging unit, for separating refrigerant into gas refrigerant and liquid refrigerant and for accumulating liquid refrigerant only in the cooling mode;a hot-gas bypass passage through which gas refrigerant discharged from the compressor is introduced into the front evaporator while bypassing the condenser in the heating mode;a front decompression unit, constructed with a fixed throttle connected to the condenser, for decompressing refrigerant flowing from the condenser in the cooling mode;a rear decompression unit, constructed with a thermal expansion valve connected between the condenser and the rear evaporator, for controlling the superheating degree of the refrigerant flowing from the rear evaporator in the cooling mode;a refrigerant pipe connecting the front decompression unit, the hot-gas bypass passage and the front evaporator;a low pressure gas-liquid separator connected to refrigerant outlets of the front and rear evaporators and to a refrigerant suction port of the compressor for separating refrigerant into gas refrigerant and liquid refrigerant and for accumulating liquid refrigerant only in the heating mode; andoutlet pipe means for respectively connecting the refrigerant outlets of the front and rear evaporators to the low pressure gas-liquid separator, whereinthe outlet pipe means comprises a check valve that prevents the refrigerant flowing from the low pressure gas-liquid separator toward the rear evaporator;a check valve is disposed between the rear evaporator and the low-pressure gas-liquid separator so as to shut a reverse flow from the low-pressure gas-liquid separator toward the rear evaporator;the low-pressure gas-liquid separator has a first inlet coupled to the refrigerant outlet of the front evaporator and a second inlet independently formed from the first inlet and coupled to the refrigerant outlet of the rear evaporator; andthe check valve is located adjacent to the second inlet.14. An air conditioner for a vehicle, comprising:a compressor for compressing refrigerant;a condenser for condensing gas refrigerant discharged from the compressor in a cooling mode;a front evaporator for providing a front area in a passenger compartment of the vehicle with cool air in the cooling mode and warm air in a heating mode;a rear evaporator for providing a rear area in the passenger compartment of the vehicle with cool air in the cooling mode;a hot-gas bypass passage through which the gas refrigerant discharged from the compressor flows into the front evaporator while bypassing the condenser in the heating mode;a low-pressure gas-liquid separator for separating refrigerant into gas refrigerant and liquid refrigerant, the low-pressure gas-liquid separator being coupled to a refrigerant outlet of the front evaporator and a refrigerant outlet of the rear evaporator, the low-pressure gas-liquid separator having a refrigerant outlet through which gas refrigerant is introduced to a suction port of the compressor; anda check valve disposed between the rear evaporator and the low-pressure gas-liquid separator to shut a reverse flow from the low-pressure gas-liquid separator toward the rear evaporator, wherein:the low-pressure gas-liquid separator has a first inlet coupled to the refrigerant outlet of the front evaporator, and a second inlet provided at a position separated from the first inlet and coupled to the refrigerant outlet of the rear evaporator; andthe check valve is disposed adjacent to the second inlet.15. The air conditioner according to claim 14, whereinthe low-pressure gas-liquid separator and the check valve are assembled as a single unitary component disposed outside the passenger compartment spaced from the rear evaporator.16. The air conditioner according to claim 15, wherein the check valve is threaded into the second inlet of the low-pressure gas-liquid separator.17. The air conditioner according to claim 15, wherein the check valve is integrally provided with the second inlet of the low-pressure gas-liquid separator.
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