JP2009184494A - Air conditioning system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning system for a vehicle capable of certainly discharging unnecessary cooled air at heating operation. <P>SOLUTION: An evaporator 16 and a heater core 22 are arranged in an air conditioning duct 31, air led into the air conditioning duct 31 is made to warm air by passing it through at least the heater core and is led into a cabin, and an air discharge means 40 capable of discharging the cooled air passing through the evaporator 16 to the outside of the cabin. The air discharge means 40 is provided with a first discharge duct 41 in which air-blowing can be introduced and the introduced blown air is discharged to the outside of the cabin while passing through an air-blowing narrowed part 41c where a flowing speed becomes faster; and a second discharge duct 42 having one end opened to a pressure reduction area 41d by the air-blowing narrowed part 41c of the first discharge duct 41 and having the other end opened to a downstream position of the evaporator 16 of the air conditioning duct 31. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle air conditioning system capable of selectively performing cooling and heating.

  A conventional vehicle air conditioning system of this type is disclosed in Patent Document 1. As shown in FIG. 7, the vehicle air conditioning system 100 includes an air conditioning duct 101, and a part of the air conditioning duct 101 is branched into a first flow path 103 and a second flow path 104 by a branch plate 102. Has been. An evaporator 105 is provided in the second flow path 104. The air flowing through the second flow path 104 passes through the evaporator 105, and the air flowing through the first flow path 103 bypasses the evaporator 105. A heater core 106 and a mix door 107 are provided further downstream from the downstream junction of the first flow path 103 and the second flow path 104.

  The air conditioning duct 101 is provided with exhaust means 110. The exhaust means 110 is opened downstream of the evaporator 105 of the air conditioning duct 101, the exhaust duct portion 111 having the other exhaust port 111a opened outside the passenger compartment, and an exhaust bypass door that can open and close the opening of the exhaust duct portion 111. 112.

  In the above configuration, during full (rapid) heating operation, the mix door 107 is positioned at a position where the bypass passage of the heater core 106 is closed, and the exhaust bypass door 112 is positioned at a position where the exhaust duct portion 111 is opened. The air blown into the air conditioning duct 101 is divided into the first flow path 103 and the second flow path 104. The blown air that passes through the first flow path 103 bypasses the evaporator 105 and is sent to the heater core 106, and the warm air heated by the heater core 106 is guided into the vehicle interior. The blown air that passes through the second flow path 104 is sent to the evaporator 105, and the cooling air that has passed through the evaporator 105 passes through the exhaust duct portion 111 and is discharged out of the passenger compartment.

That is, the cooling air that has passed through the evaporator 105 is necessary during the cooling operation, but becomes a factor that impedes the heating performance during the heating operation. In particular, when the vehicle interior is desired to be heated rapidly (during rapid heating operation), it becomes a heating inhibition factor. With this in mind, in the conventional example, the cooling performance that has passed through the evaporator 105 is exhausted out of the passenger compartment to improve the heating performance.
Japanese Patent Laid-Open No. 10-100632

  However, since the exhaust duct portion 111 of the conventional example has one end connected to the air conditioning duct 101 and the other end simply opened to the outside of the passenger compartment, the exhausted cooling air is exhausted by the blowing pressure in the air conditioning duct 101. Is done. Therefore, when the exhaust duct portion 111 is long and the passage resistance is large, or when ram pressure or the like acts from the exhaust port 111a, there is a possibility that unnecessary cooling air cannot be reliably exhausted.

  Then, an object of this invention is to provide the air conditioning apparatus for vehicles which can exhaust reliably the unnecessary cooling wind at the time of heating operation.

  In the invention of claim 1, which achieves the above object, an evaporator and a heater core of an air conditioner are arranged in an air conditioning duct, and the air guided into the air conditioning duct is at least warm air by passing through the heater core. The vehicle air conditioning system is provided with an exhaust unit that is guided into the passenger compartment and can exhaust the cooling air that has passed through the evaporator to the outside of the passenger compartment. One end is opened to the first exhaust duct that is exhausted outside the passenger compartment through the blow restrictor where the flow rate is increased, and the blow restrictor of the first exhaust duct, and the evaporator of the air conditioning duct And a second exhaust duct having the other end opened at a downstream position.

  A second aspect of the present invention is the vehicle air conditioning system according to the first aspect, wherein the first exhaust duct is provided so that traveling wind and forced air of a blower fan can be selectively introduced. And

  Invention of Claim 3 is the air conditioning system for vehicles of Claim 2, Comprising: When it detects whether there exists running wind and judges that there is no running wind, the said ventilation fan is driven, When it is determined that there is a traveling wind, the blower fan is controlled not to be driven.

  A fourth aspect of the present invention is the vehicle air conditioning system according to any one of the first to third aspects, wherein an exhaust bypass door capable of opening and closing the second exhaust duct is provided.

  A fifth aspect of the present invention is the air conditioning system for a vehicle according to any one of the first to fourth aspects, wherein the air conditioner has a first circulation path through which a first refrigerant circulates. A heating circulation device having a second circulation path through which a second refrigerant circulates separately from the first circulation path, and the first circulation path of the heat pump type cooling device includes a first circulation path. A compressor that compresses the refrigerant; a condenser that is disposed in the second circulation path and dissipates heat of the first refrigerant to the second refrigerant; an expansion means that expands the first refrigerant; and expansion by the expansion means The evaporator for cooling the air by exchanging heat between the first refrigerant and the air, and a pump for circulating the second refrigerant in the second circulation path of the circulation device for heating. Heat between the second refrigerant and air The heater core that heats the air by heating and a radiator that dissipates the heat of the second refrigerant are provided, the second refrigerant is a fluid, and performs heat exchange by a change in sensible heat. The evaporator and the heater core dissipate heat to the outside air of the passenger compartment, and the evaporator and the heater core are arranged in an air conditioning duct that can introduce air blown into the passenger compartment by a fan, and the passing air in the air conditioning duct is introduced into the passenger compartment as conditioned air.

  A sixth aspect of the present invention is the vehicle air conditioning system according to the fifth aspect, wherein the radiator bypass flow path for bypassing the radiator and the second refrigerant flow to the radiator or the radiator bypass flow path. And a flow path switching valve for switching the flow path.

  According to the first aspect of the present invention, the blown air passes through the blow restrictor of the first exhaust duct, and a decompression region is generated around the blow restrictor. This decompression causes the evaporator of the air conditioning duct to pass through the second exhaust duct. The downstream side is sucked. Due to this suction force, the cooling air that has passed through the evaporator flows into the first exhaust duct through the second exhaust duct, and the cooling air that has flowed into the first exhaust duct is discharged outside the vehicle compartment by the blowing force of the first exhaust duct. . Therefore, even when the second exhaust duct and the first exhaust duct are long and the blowing resistance is large, or when ram pressure or the like acts from the exhaust port, unnecessary cooling air can be reliably exhausted.

  According to the second aspect of the present invention, if the air is sent into the first exhaust duct by the driving wind while the vehicle is running and by the forced air when the vehicle is stopped, the unnecessary cooling air is surely supplied regardless of the running state. Can exhaust.

  According to the invention of claim 3, since the traveling wind and the forced wind are automatically switched, the user does not need to perform a switching operation.

  According to the invention of claim 4, since the cooling air can be exhausted only when unnecessary cooling air needs to be exhausted, it is possible to prevent a situation in which the cooling air passing through the evaporator is exhausted wastefully.

  According to the invention of claim 5, since the first refrigerant of the heat pump type cooling device only needs to circulate the first circulation path along a constant route regardless of the heating operation and the cooling operation, the configuration of the heat pump type cooling device. Easy and good. The heating circulation device may be configured to circulate the second refrigerant that receives heat from the condenser through a path passing through the heater core and the radiator. And since the heat received from the condenser can be radiated to the air outside the vehicle compartment with a radiator, and the heat received from the condenser can be radiated from the heater core to the vehicle compartment, cooling and heating can be combined. As described above, in a system that selectively performs heating and cooling using a heat pump type cooling device, the configuration of the heat pump type cooling device can be simplified, and the entire air conditioning system can be configured simply.

  In addition, since the refrigerant in the second circulation path is a liquid and changes its sensible heat without undergoing a phase change, the heat transfer efficiency is good and the size can be further reduced.

  According to the sixth aspect of the present invention, since it is possible to change the route whether or not to allow the radiator to pass, deterioration of the heating performance can be prevented.

  According to the invention of claim 7, in heating operation, the air-conditioned wind is heated by using both the heat generated in the heat pump type cooling device and the heat generated by the heater, so in a vehicle that does not have a large heat source such as an engine. Even if the outside air temperature is a very low temperature state, sufficient heating performance can be exhibited.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 6 show an embodiment of the present invention, FIG. 1 is a schematic layout diagram of an air conditioning system for a vehicle, FIG. 2 is a configuration diagram of an air-conditioning apparatus, and FIG. 3 is a cross-sectional view of a main part of an air-conditioning unit and exhaust means. 4 (a) is a perspective view of the radiator fan, FIG. 4 (b) is an exploded perspective view showing a connection portion between the air introduction port of the first exhaust duct and the shroud of the radiator fan, and FIG. 5 is a view during full heating operation. FIG. 6 is a flowchart of an exhaust operation during a full heating operation.

  As shown in FIG. 1, the vehicle air conditioning system 1 has a cooling / heating device 10 that produces cooling air and hot air by performing heat transfer of the refrigerant, and a cooling air and hot air produced by the cooling / heating device 10. The air-conditioning unit 30 is used as the conditioned air, and the exhaust means 40 is used to exhaust unnecessary cooling air from the air-conditioning unit 30. The air conditioner 10 and the air conditioning unit 30 are disposed below the instrument panel 2 and in the center.

  In front of the engine room of the vehicle, a radiator 3 that cools cooling water that flows to a heat-generating device and the like, and a radiator fan 4 that is a blower fan that sends air to the radiator 3 are arranged. The detailed configuration of the radiator fan 4 will be described below.

  As shown in FIG. 2, the cooling / heating device 10 is a combination of a heat pump type cooling device A and a heating circulation device B.

  The heat pump type cooling device A has a first circulation path 11 in which carbon dioxide as a first refrigerant is enclosed, and in this first circulation path 11, a compressor 12, a water-cooled condenser 13 as a condenser, and internal heat exchange. A container 14, an expansion valve 15 that is an expansion means, an evaporator 16, and an accumulator 17 are sequentially provided.

  The compressor 12 compresses the sucked relatively low temperature and low pressure first refrigerant and discharges it as a high temperature and high pressure refrigerant.

  The water-cooled condenser 13 is disposed in an equipment storage chamber 25 in the second circulation path 18 described below, and cools the first refrigerant pumped from the compressor 12 with the second refrigerant. That is, heat exchange is performed between the first refrigerant and the second refrigerant in the water-cooled condenser 13, and the second refrigerant is heated by the first refrigerant.

  The internal heat exchanger 14 exchanges heat between the first refrigerant sent from the water-cooled condenser 13 and the cooler first refrigerant sent from the accumulator 17, and the first refrigerant sent from the water-cooled condenser 13. Is further cooled.

  The expansion valve 15 expands (depressurizes) the first refrigerant that has passed through the internal heat exchanger 14 and sends it to the evaporator 16 as a low-temperature and low-pressure gas.

  The evaporator 16 exchanges heat between the first refrigerant sent from the expansion valve 15 and the air passing through the evaporator 16, and the air passing through the evaporator 16 is cooled by the first refrigerant. The evaporator 16 is arrange | positioned in the air-conditioning duct 31 in the air-conditioning unit 30, and the specific arrangement position is explained in full detail below.

  The accumulator 17 gas-liquid separates the first refrigerant sent from the evaporator 16 and sends only the first refrigerant in the gas phase state to the internal heat exchanger 14, and temporarily stores the first refrigerant in the liquid phase state. To be stored.

  The heating circulation device B has a second circulation path 18 in which water as a second refrigerant is sealed, and in this second circulation path 18, a pump 19, a radiator 20, a device storage chamber 25, and a heater core 22. Are provided in order. The device storage chamber 25 is a space having a larger cross-sectional area than the second circulation path 18, and the electric heater 21, which is a heater, is stored in the interior together with the water-cooled condenser 13.

  The pump 19 pressurizes and pumps the sucked second refrigerant in order to circulate the second refrigerant in the second circulation path 18.

  The radiator 20 radiates the heat of the second refrigerant to the outside air. The outside air is blown by an electric fan or traveling wind, and heat exchange is performed between the second refrigerant and the outside air.

  The electric heater 21 is provided on the downstream side of the water-cooled condenser 13, and generates heat when energized to heat the second refrigerant.

  The heater core 22 heats the air passing through the heater core 22 by exchanging heat between the second refrigerant and the air passing through the heater core 22. The heater core 22 is disposed in the air conditioning duct 31 in the air conditioning unit 30, and the specific position of the heater core 22 will be described in detail below.

  The second circulation path 8 is provided with a radiator bypass passage 23 that bypasses the radiator 20, and the second switching path 24 is switched by switching a passage switching valve 24 provided on the upstream side of the radiator bypass passage 23. The flow of the refrigerant can be switched to the radiator 20 side or the radiator bypass flow path 23 side.

  Next, operation | movement of the air conditioning apparatus 10 of the vehicle air conditioning system 1 is demonstrated.

  The heat pump type cooling device A is operating both during the heating operation and during the cooling operation, and the first refrigerant circulates through the first circulation path 11 along a certain path, and the high temperature first refrigerant flowing through the water cooling condenser 13 The second refrigerant is heated.

  During the heating operation, the electric heater 21 is turned on to further heat the second refrigerant heated by the water-cooled condenser 13. As a result, the second refrigerant having a high temperature flows through the heater core 22, whereby the air passing through the heater core 22 is heated, and hot air can be taken into the passenger compartment. Further, in order to prevent further heat dissipation from the second refrigerant radiated by the heater core 22, the flow path switching valve 24 is switched to flow the second refrigerant to the radiator bypass flow path 23 side. Thus, the second refrigerant is heated again by the water-cooled condenser 13 and the electric heater 21 without radiating heat in the radiator 20.

  During the cooling operation, the electric heater 21 is turned off and the flow path switching valve 24 is switched to flow the second refrigerant to the radiator 20 side. Thereby, the second refrigerant that has absorbed heat in the water-cooled condenser 13 can be dissipated in the radiator 20.

  As shown in FIG. 3, the air conditioning unit 30 includes an air conditioning duct 31. A blower fan (not shown) is provided upstream of the air conditioning duct 31. Inside air or outside air can be introduced into the air-conditioning duct 31 by blowing air from the blower fan.

  In the air conditioning duct 31, the evaporator 16 and the heater core 22 are arranged in this order, and a mix door 32 is provided between the evaporator 16 and the heater core 22. The evaporator 16 is arrange | positioned so that all the ventilation which passes through the air-conditioning duct 31 may pass. The heater core 22 is disposed in a substantially lower half air passage of the air conditioning duct 31, and the ratio between the air flowing through the heater core 22 and the air blowing bypassing the heater core 22 can be adjusted by the mix door 32.

  A plurality of mode doors 33 are provided downstream of the heater core 22, and the conditioned air can be blown to a desired position in the passenger compartment by changing the combination of the mode doors 33 to be opened.

  The exhaust means 40 includes a first exhaust duct 41, a second exhaust duct 42, and an exhaust bypass door 43 that opens and closes the second exhaust duct 42. As for the 1st exhaust duct 41, the ventilation inlet 41a of the one end is arrange | positioned just downstream of the radiator fan 4, The detailed arrangement structure is explained in full detail below. An exhaust port 41b at the other end of the first exhaust duct 41 is opened to the outside of the passenger compartment at a position below the floor of the vehicle in order to minimize troubles in traveling. The first exhaust duct 41 is provided with a blow restrictor 41c having a blower section that gradually decreases from the blow introduction port 41a toward the exhaust port 41b. When the blown air passes through the air blow restrictor 41c, the flow rate of the introduced blown air increases, so that a reduced pressure region 41d is formed on the outer periphery of the air blow restrictor 41c in the first exhaust duct 41. One end of the second exhaust duct 42 is opened to the decompression region 41 d of the first exhaust duct 41, and the other end is opened to a position immediately downstream of the evaporator 16 of the air conditioning duct 31.

  The exhaust bypass door 43 is provided at an opening position on one end side of the second exhaust duct 42, and a simple structure like a butterfly type is preferable. At the closed position of the exhaust bypass door 43, the cooling air that has passed through the evaporator 16 flows through the air conditioning duct 31 and is guided into the vehicle interior. In the open position of the exhaust bypass door 43, part of the cooling air that has passed through the evaporator 16 is guided to the second exhaust duct 42.

  As shown in FIGS. 4A and 4B, the radiator fan 4 supports the motor portion 4a, the blade portion 4b fixed to the rotating shaft of the motor portion 4a, the motor portion 4a, and the blade portion 4b. And a shroud portion 4c covering the periphery of the. A duct bracket 5 is provided on the shroud portion 4c on the downstream side of the blade portion 4b. With the duct bracket 5, the air inlet 41 a side of the first exhaust duct 41 is fixed at a close position downstream of the blade portion 4 b. Thus, the first exhaust duct 41 can introduce the traveling wind when the radiator fan 4 is not driven and the forced wind when the radiator fan 4 is driven.

  Next, a cooling air exhaust control system during full (rapid) heating operation of the vehicle air conditioning system 1 will be described. As shown in FIG. 5, detection data from an outside air temperature sensor 51 that detects the temperature outside the passenger compartment, a vehicle speed detector 52 that detects the speed of the vehicle, and the like are input to the air conditioning control unit 50 and a user operation command. Data (air conditioning on / off, air conditioning temperature, etc.) is input. The air conditioning control unit 50 controls the driving of the air conditioner 10, the radiator fan 4, the door actuator 53, and the like based on these inputs. The door actuator 53 drives the positions of the mix door 32, the mode door 33 and the exhaust bypass door 43. When the outside air temperature is lower than the predetermined temperature, the air conditioning control unit 50 selects the full (rapid) heating mode, and executes the flow of FIG. 6 to control the cooling air exhaust operation. The flow of FIG. 6 will be described in detail below.

  Next, the operation of the air conditioning unit 30 during the cooling operation and the heating operation will be described.

  During the cooling operation, the mix door 32 is positioned at a position where the flow path to the heater core 22 is closed, the exhaust bypass door 43 is positioned at a position where the second exhaust duct 42 is closed, and at least one of the mode doors 33 is an open position. Located in. Then, the low-temperature conditioned air that has passed through the evaporator 16 is blown into the passenger compartment.

  During the heating operation, the mix door 32 is positioned at a position where all the cooling air that has passed through the evaporator 16 passes through the heater core 22, the exhaust bypass door 43 is positioned at a position where the second exhaust duct 42 is closed, and the mode door 33 At least one is located in the open position. And the cold wind which passed the evaporator 16 is made high temperature by passing the heater core 22, and this high temperature conditioned wind is ventilated by the vehicle interior. The same door arrangement is selected during full (rapid) heating operation, and the cooling air exhaust operation described below is performed.

  In addition, the mix door 32 can adjust the ratio between the low-temperature airflow that passes only through the evaporator 16 and the high-temperature airflow that passes through both the evaporator 16 and the heater core 22. During operation, warm air at a desired temperature can be produced and blown into the passenger compartment.

  Next, the exhaust operation of the cooling air during the full (rapid) heating operation will be described.

  As shown in FIG. 6, when the air conditioning apparatus 10 is turned on (step S1), the air conditioning control unit 50 acquires the outside air temperature from the outside air temperature sensor 51 and checks whether the outside air temperature is lower than a predetermined temperature ( Step S2). If the outside air temperature is higher than the predetermined temperature, the process proceeds to the normal operation mode (step S3). When the outside air temperature is lower than the predetermined temperature, the full (rapid) heating operation mode is selected, and the exhaust bypass door 43 is positioned to open the second exhaust duct 42 as shown in FIG. 3 (step S4). ). Next, the air-conditioning control unit 50 acquires the vehicle speed from the vehicle speed detector 52 and checks whether the vehicle speed is such that traveling wind is obtained (step S5). If the vehicle speed is not high enough to obtain the traveling wind, the radiator fan 4 is turned on (step S6).

  Therefore, traveling wind or forced wind of the radiator fan 4 is always introduced into the first exhaust duct 41. Since the air introduced into the first exhaust duct 41 increases the flow rate and passes through the air blow restrictor 41c, a reduced pressure region 41d is generated around the air blow restrictor 41c. By this decompression, the downstream side of the evaporator 16 of the air conditioning duct 31 is sucked through the second exhaust duct 42. The cooling air that has passed through the evaporator 16 by this suction force flows into the first exhaust duct 41 through the second exhaust duct 42, and the cooling air that has flowed into the first exhaust duct 41 is It is discharged outside the room. Therefore, even when the second exhaust duct 42 and the first exhaust duct 41 are long and the blowing resistance is large, or when ram pressure or the like acts from the exhaust port 41b, unnecessary cooling air can be reliably exhausted.

  In the exhaust operation of the cooling air, it is preferable to control to increase the air volume of the radiator fan 4 to compensate for the reduced air volume discharged outside the passenger compartment.

  In this embodiment, the 1st exhaust duct 41 is provided so that traveling wind and the forced wind of the radiator fan 4 can be introduced selectively. Therefore, if the air is sent into the first exhaust duct 41 while the vehicle is running and by forced wind while the vehicle is stopped, unnecessary cooling air can be reliably exhausted regardless of the running state.

  In this embodiment, it is detected whether or not there is a traveling wind, and when it is determined that there is no traveling wind, the radiator fan 4 is driven, and when it is determined that there is traveling wind, the radiator fan 4 is driven. Control not to. By controlling in this way, it is possible to automatically switch between running wind and forced wind, so the user does not need to perform a switching operation.

  In this embodiment, an exhaust bypass door 43 that can open and close the opening of the second exhaust duct 42 is provided. Accordingly, since the cooling air can be exhausted only when unnecessary cooling air needs to be exhausted, it is possible to prevent the cooling air that has passed through the evaporator 16 from being exhausted wastefully.

  In this embodiment, the cooling air is exhausted outside the vehicle compartment during full (rapid) heating operation, but the cooling air may be exhausted outside the vehicle compartment during heating operation other than during full operation. Further, when the purpose is to improve the heating capacity, it may be performed only when the odor emitted from the evaporator 16 at the initial stage of operation is discharged.

  In this embodiment, unnecessary cooling air is discharged outside the passenger compartment, but it may be discharged after cooling the heat generating devices (electric compressor, battery, etc.) using the exhausted cooling air.

  In this embodiment, since the blower fan is constituted by the radiator fan 4, it is not necessary to provide a dedicated blower fan for exhausting the cooling air. Of course, a dedicated blower fan may be provided for exhausting the cooling air. In the case where a dedicated blower fan is provided, it is possible to send a blown air, such as a blower force most suitable for the exhaust, to the first exhaust duct 41, so that the exhaust performance can be improved.

  In this embodiment, the air conditioning apparatus 10 includes a heat pump type cooling device A having a first circulation path 11 through which a first refrigerant circulates and a second circulation through which a second refrigerant circulates separately from the first circulation path 11. A heating circulation device B having a path 18, and the first circulation path 11 of the heat pump type cooling apparatus A is disposed in the compressor 12 for compressing the first refrigerant and the second circulation path 18, and The heat is exchanged between the condenser 13 for radiating the heat of the refrigerant to the second refrigerant, the expansion valve 15 for expanding the first refrigerant, and the first refrigerant expanded by the expansion valve 15 and the air. And an evaporator 16 that cools the air, and in the second circulation path 18 of the heating circulation device B, heat is exchanged between the pump 19 that circulates the second refrigerant and the second refrigerant and air. A heater core 22 for heating A radiator 20 is provided to dissipate the heat of the medium.

  Accordingly, the first refrigerant of the heat pump cooling device A only needs to be circulated through the first circulation path 11 along a constant route regardless of the heating operation and the cooling operation, and thus the configuration of the heat pump cooling device A may be simple. . The heating circulation device B may be configured to circulate the second refrigerant that receives heat from the water-cooled condenser 13 through a path that passes through the heater core 22 and the radiator 20. And like this embodiment, by radiating the heat received from the water-cooled condenser 13 to the vehicle exterior air with the radiator 20, or radiating the heat received from the water-cooled condenser 13 from the heater core 22 into the vehicle interior, Cooling and heating can be combined. As described above, in a system that selectively performs heating and cooling using a heat pump type cooling device, the configuration of the heat pump type cooling device can be simplified, and the entire air conditioning system can be configured simply.

  In addition, since the refrigerant in the second circulation path 18 is a liquid and changes its sensible heat without undergoing a phase change, the heat transfer efficiency is good and the size can be further reduced.

  In this embodiment, there are a radiator bypass channel 23 that bypasses the radiator 20 and a channel switching valve 24 that switches the channel so that the second refrigerant flows to the radiator 20 or the radiator bypass channel 23. Since it is provided, it is possible to change the route whether or not to allow the radiator 20 to pass therethrough, so that deterioration of the heating performance can be prevented.

  In this embodiment, the air conditioning apparatus 10 is provided with an electric heater 21 for heating the second refrigerant in the second circulation path 18. Accordingly, during the heating operation, the air-conditioning air is heated by using both the heat generated in the heat pump type cooling device A and the heat generated by the electric heater 21, so that the outside air temperature is low in a vehicle that does not have a large heat source such as an engine. Even in an extremely low temperature state, sufficient heating performance can be exhibited.

  In this embodiment, since the condenser 13 is a water-cooled type, it can be made more compact than the air-cooled type, and the passage resistance of the first refrigerant can be reduced. Therefore, the required power of the compressor 12 is reduced by the amount corresponding to the reduction of the passage resistance, so that the driving force of the compressor 12 can be saved and the compressor 12 can be downsized.

  In the above-described embodiment, unnecessary cooling air is discharged outside the passenger compartment during the heating operation. However, unnecessary warm air may be discharged outside the passenger compartment during cooling.

1 shows an embodiment of the present invention and is a schematic layout diagram of a vehicle air conditioning system. FIG. 1 shows an embodiment of the present invention and is a configuration diagram of an air conditioning apparatus. FIG. FIG. 2 is a cross-sectional view of a main part of an air conditioning unit and exhaust means according to an embodiment of the present invention. 1A and 1B show an embodiment of the present invention, in which FIG. 1A is a perspective view of a radiator fan, and FIG. 1B is an exploded perspective view showing a connection portion between a ventilation inlet of a first exhaust duct and a shroud of the radiator fan. FIG. 3 is a circuit block diagram of a cooling air exhaust control system in a full heating operation according to an embodiment of the present invention. 1 is a flowchart of an exhaust operation during a full heating operation according to an embodiment of the present invention. It is a block diagram of the air conditioning system for vehicles of a prior art example.

Explanation of symbols

1 Air conditioner for vehicles 4 Radiator fan (fan)
DESCRIPTION OF SYMBOLS 10 Air conditioning apparatus 11 1st circulation path 12 Compressor 13 Water cooling condenser (condenser)
15 Expansion valve (expansion means)
16 Evaporator 18 Second circulation path 19 Pump 20 Radiator 21 Electric heater (heater)
DESCRIPTION OF SYMBOLS 22 Heater core 23 Radiator bypass flow path 24 Flow path switching valve 31 Air-conditioning duct 40 Exhaust means 41 1st exhaust duct 41c Blower throttle part 41d Pressure reduction area 42 2nd exhaust duct 43 Exhaust bypass door A Heat pump type cooling device B Heating circulation apparatus

Claims (7)

An evaporator (16) and a heater core (22) of the air conditioner (10) are arranged in the air conditioning duct (31), and air guided into the air conditioning duct (31) passes at least through the heater core (22). The vehicle air conditioning system (1) is provided with exhaust means (40) that is heated by the air and guided into the vehicle interior and that can exhaust the cooling air that has passed through the evaporator (16) to the outside of the vehicle interior.
The exhaust means (40) is configured to introduce a first exhaust duct (41) through which a blown air can be introduced, and the introduced blown air is exhausted out of the passenger compartment through a blow restrictor (41c) at which a flow velocity is increased. One end is opened to the decompression region (41d) by the air blow restrictor (41c) of one exhaust duct (41), and the other end is opened to the downstream position of the evaporator (16) of the air conditioning duct (31). An air conditioning system (1) for a vehicle comprising an exhaust duct (42). A vehicle air conditioning system (1) according to claim 1,
The vehicle air conditioning system (1), wherein the first exhaust duct (41) is provided so that traveling wind and forced air of the blower fan (4) can be selectively introduced. A vehicle air conditioning system (1) according to claim 2,
When it is determined whether or not there is a traveling wind, and it is determined that there is no traveling wind, the blower fan (4) is driven, and when it is determined that there is a traveling wind, the blower fan (4) is turned on. A vehicle air conditioning system (1) characterized by being controlled so as not to be driven. The vehicle air conditioning system (1) according to any one of claims 1 to 3,
The vehicle air conditioning system (1), wherein an exhaust bypass door (43) capable of opening and closing the second exhaust duct (42) is provided. A vehicle air conditioning system (1) according to any one of claims 1 to 4,
In the air conditioner (10), the second refrigerant circulates separately from the heat pump type cooling device (A) having the first circulation path (11) through which the first refrigerant circulates and the first circulation path (11). A heating circulation device (B) having a second circulation path (18) for
The first circulation path (11) of the heat pump type cooling device (A) is arranged in the compressor (12) for compressing the first refrigerant and the second circulation path (18), and the heat of the first refrigerant is Heat exchange is performed between the condenser (13) for radiating heat to the second refrigerant, the expansion means (15) for expanding the first refrigerant, and the first refrigerant expanded by the expansion means (15) and the air. An evaporator (16) for cooling the air,
In the second circulation path (18) of the heating circulation device (B), a pump (19) that circulates the second refrigerant and a heater core that heats the air by exchanging heat between the second refrigerant and the air. (22) and a radiator (20) that dissipates the heat of the second refrigerant, the second refrigerant is a fluid, and performs heat exchange by a sensible heat change,
The radiator (20) radiates heat to outside air of the passenger compartment,
The evaporator (16) and the heater core (22) are arranged in an air conditioning duct (31) that can introduce air into the vehicle interior by a fan, and the passing air in the air conditioning duct (31) is introduced into the vehicle interior as conditioned air. An air conditioning system for a vehicle (1) characterized in that: The vehicle air conditioning system according to claim 5,
A heat exchanger bypass flow path (23) that bypasses the heat radiator (20), and a flow path switch that switches the flow path so that the second refrigerant flows to the heat radiator (20) or the heat radiator bypass flow path (23). A vehicle air conditioning system (1) characterized in that a valve (24) is provided. The vehicle air conditioning system (1) according to claim 5 or 6,
The vehicle air conditioning system (1), wherein the air conditioner (10) is provided with a heater (21) for heating the second refrigerant in the second circulation path (18).

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